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10.1007%2Fs12016-016-8540-0
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introduction
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Histamine is the main suspect mediator in allergic reactions, since angioedema can be seen in anaphylaxis [>>1<<] or as a concurrent symptom of the mast-cell-driven diseases like chronic spontaneous urticaria [2].
n3:mentions
n2:8400230
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Histamine is the main suspect mediator in allergic reactions, since angioedema can be seen in anaphylaxis [1] or as a concurrent symptom of the mast-cell-driven diseases like chronic spontaneous urticaria [>>2<<]. For angioedema with unknown aetiology (idiopathic angioedema), histamine receptor antagonists are clinically applied on a trial-and-error basis, sometimes with higher than recommended doses [2, 3]. Approximately one in six patients with
n3:mentions
n2:24785199
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_:vb51138860
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For angioedema with unknown aetiology (idiopathic angioedema), histamine receptor antagonists are clinically applied on a trial-and-error basis, sometimes with higher than recommended doses [>>2<<, 3]. Approximately one in six patients with idiopathic angioedema remains unresponsive to antihistamines [4, 5]. In such cases, the involvement of other mediators should be considered.
n3:mentions
n2:24785199
Subject Item
_:vb51138861
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n3:Context
rdf:value
For angioedema with unknown aetiology (idiopathic angioedema), histamine receptor antagonists are clinically applied on a trial-and-error basis, sometimes with higher than recommended doses [2, >>3<<]. Approximately one in six patients with idiopathic angioedema remains unresponsive to antihistamines [4, 5]. In such cases, the involvement of other mediators should be considered.
n3:mentions
n2:24673465
Subject Item
_:vb51138862
rdf:type
n3:Context
rdf:value
Approximately one in six patients with idiopathic angioedema remains unresponsive to antihistamines [>>4<<, 5]. In such cases, the involvement of other mediators should be considered.
n3:mentions
n2:25196353
Subject Item
_:vb51138863
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n3:Context
rdf:value
Approximately one in six patients with idiopathic angioedema remains unresponsive to antihistamines [4, >>5<<]. In such cases, the involvement of other mediators should be considered.
n3:mentions
n2:17060655
Subject Item
_:vb51138864
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n3:Context
rdf:value
This vasoactive peptide was first identified as a mediator for angioedema in patients with hereditary angioedema (HAE) [>>6<<–8]. Bradykinin is the end-product of the contact activation system. This enzymatic cascade circulates in the plasma and consists of factor XII (FXII), plasma prekallikrein (PPK) and high molecular weight kininogen (HK). This system is
n3:mentions
n2:6222104 n2:9734886 n2:10589018
Subject Item
_:vb51138865
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Several studies suggested potential natural activators of FXII [>>9<<–13], but thus far none of these have been definitively established to induce activation of the contact system during angioedema in vivo.
n3:mentions
n2:18725990 n2:21349432 n2:20005807 n2:19372258 n2:20796202
Subject Item
_:vb51138866
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n6:Section
dc:title
blood coagulation
n6:contains
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Cells that surround the vessel wall express TF so that only when the endothelial layer is compromised will locally active coagulation take place [>>48<<, 49]. After binding to TF, activated factor VII (FVII) of the extrinsic pathway activates factor X (FX), and to a lesser extent factor IX (FIX) [50]. Activated FX next triggers the formation of a small amount of active factor II
n3:mentions
n2:19372318
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_:vb51138868
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Cells that surround the vessel wall express TF so that only when the endothelial layer is compromised will locally active coagulation take place [48, >>49<<]. After binding to TF, activated factor VII (FVII) of the extrinsic pathway activates factor X (FX), and to a lesser extent factor IX (FIX) [50]. Activated FX next triggers the formation of a small amount of active factor II (thrombin).
n3:mentions
n2:2237820
Subject Item
_:vb51138869
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n3:Context
rdf:value
After binding to TF, activated factor VII (FVII) of the extrinsic pathway activates factor X (FX), and to a lesser extent factor IX (FIX) [>>50<<]. Activated FX next triggers the formation of a small amount of active factor II (thrombin). Thrombin accelerates coagulation via positive feedback mechanisms. Factor VIII (FVIII), activated by thrombin, forms a complex together with FIX
n3:mentions
n2:22652793
Subject Item
_:vb51138870
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n3:Context
rdf:value
Furthermore, FXI of the intrinsic pathway is also activated by thrombin [>>51<<], and additional FIX is being amplified by thrombin activation.
n3:mentions
n2:20439754
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The initiator of this cascade of events, TF, is of vital importance since TF deficiency is lethal and incompatible with normal embryonic development or may cause early death in the perinatal period [>>52<<].
n3:mentions
n2:8779717
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Mysteriously, FXII deficiency is a seemingly asymptomatic condition in both mice and human (Hageman’s disease), as it is not associated with a bleeding tendency, unlike deficiencies of other coagulation factors [>>53<<]. The same holds for the other components of the contact system cascade; their deficiency does not result in bleeding [54].
n3:mentions
n2:14367514
Subject Item
_:vb51138873
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The same holds for the other components of the contact system cascade; their deficiency does not result in bleeding [>>54<<]. This makes the relevance of FXII and the contact system for physiological hemostasis debatable. This logic raises a pertinent question: should FXII be regarded as a coagulation factor, as far as angioedema is concerned? It has been
n3:mentions
n2:12780784
Subject Item
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It has been demonstrated that the bradykinin-producing contact system machinery can be fully activated in plasma without evidence of coagulation [>>10<<, 11, 55]. This might be explained by the physical properties of FXII(a): in a sequence of cleavage events, FXIIa is progressively fragmented. The fragment that remains after multiple cleavages (βFXIIa or FXIIf) has lost its potential for
n3:mentions
n2:21349432
Subject Item
_:vb51138875
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n3:Context
rdf:value
It has been demonstrated that the bradykinin-producing contact system machinery can be fully activated in plasma without evidence of coagulation [10, >>11<<, 55]. This might be explained by the physical properties of FXII(a): in a sequence of cleavage events, FXIIa is progressively fragmented. The fragment that remains after multiple cleavages (βFXIIa or FXIIf) has lost its potential for
n3:mentions
n2:18725990
Subject Item
_:vb51138876
rdf:type
n3:Context
rdf:value
It has been demonstrated that the bradykinin-producing contact system machinery can be fully activated in plasma without evidence of coagulation [10, 11, >>55<<]. This might be explained by the physical properties of FXII(a): in a sequence of cleavage events, FXIIa is progressively fragmented. The fragment that remains after multiple cleavages (βFXIIa or FXIIf) has lost its potential for
n3:mentions
n2:23349032
Subject Item
_:vb51138877
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n3:Context
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Murine models of FXII deficiency indicate that the basal production of bradykinin in plasma is approximately 50 % dependent on FXII [>>56<<]. This suggests the presence of a second pathway generating bradykinin in vivo. Several alternative, FXII-independent routes for initiation of bradykinin generation have been identified. The endothelial cell-derived factors heat shock
n3:mentions
n2:16732380
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The endothelial cell-derived factors heat shock protein 90 (HSP90) and prolylcarboxypeptidase may facilitate FXII-independent PPK activation on the endothelial cell surface [>>57<<]. Moreover, bradykinin can be directly released from HK by other enzymes than PK; this was recently demonstrated for Mannose Binding Serine Protease 1 [58]. The relevance of these FXII-independent pathways of bradykinin generation needs
n3:mentions
n2:23672780
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Moreover, bradykinin can be directly released from HK by other enzymes than PK; this was recently demonstrated for Mannose Binding Serine Protease 1 [>>58<<]. The relevance of these FXII-independent pathways of bradykinin generation needs to be established. It is imaginable that during endothelial cell activation or damage, small amounts of PPK are activated by these mechanisms, which boost
n3:mentions
n2:21625439
Subject Item
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described, (mostly) located in the proline-rich region of FXII (according to mature amino acid sequence: Thr309Arg, Thr309Lys, Ala324Pro, 72-bp deletion at c971_1018þ24 and an 18-bp duplication c894_911, and c1681-1G/A in intron 13) [>>16<<–20, 59]. Additionally, isolated cases of normal C1-INH with FXII mutation have been successfully treated with the bradykinin-receptor antagonist—icatibant.
n3:mentions
n2:26392288 n2:17186468 n2:21849258 n2:16638441 n2:25524745
Subject Item
_:vb51138881
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(mostly) located in the proline-rich region of FXII (according to mature amino acid sequence: Thr309Arg, Thr309Lys, Ala324Pro, 72-bp deletion at c971_1018þ24 and an 18-bp duplication c894_911, and c1681-1G/A in intron 13) [16–20, >>59<<]. Additionally, isolated cases of normal C1-INH with FXII mutation have been successfully treated with the bradykinin-receptor antagonist—icatibant.
n3:mentions
n2:23994767
Subject Item
_:vb51138882
rdf:type
n3:Context
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Plasmin, the central enzyme of the fibrinolytic system, cleaves the fibrin lattice into smaller fibrin degradation products (FDPs) including D-dimers, which are regarded as a valuable biomarker for thrombosis [>>60<<]. Plasmin is generated from its zymogenic precursor plasminogen by either tissue plasminogen activator (tPA) or urokinase plasminogen activator (uPA) [61]. Fibrin provides a platform for its own degradation by binding and potentiating
n3:mentions
n2:25934358
Subject Item
_:vb51138883
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n3:Context
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Plasmin is generated from its zymogenic precursor plasminogen by either tissue plasminogen activator (tPA) or urokinase plasminogen activator (uPA) [>>61<<]. Fibrin provides a platform for its own degradation by binding and potentiating both tPA and plasminogen. The fibrinolytic system is amenable to inhibition at several stages: plasmin is directly inhibited by α2-antiplasmin, while
n3:mentions
n2:15842654
Subject Item
_:vb51138884
rdf:type
n3:Context
rdf:value
The fibrinolytic system is amenable to inhibition at several stages: plasmin is directly inhibited by α2-antiplasmin, while specific inhibitors of plasminogen activators (PAI-1 and PAI-2) control tPA and uPA [>>61<<, 62]. Activation of plasminogen on the fibrin lattice is indirectly prevented by thrombin-activatable fibrinolysis inhibitor, via removal of C-terminal lysines that are needed for the binding of tPA and plasminogen to fibrin.
n3:mentions
n2:15842654
Subject Item
_:vb51138885
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n3:Context
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The fibrinolytic system is amenable to inhibition at several stages: plasmin is directly inhibited by α2-antiplasmin, while specific inhibitors of plasminogen activators (PAI-1 and PAI-2) control tPA and uPA [61, >>62<<]. Activation of plasminogen on the fibrin lattice is indirectly prevented by thrombin-activatable fibrinolysis inhibitor, via removal of C-terminal lysines that are needed for the binding of tPA and plasminogen to fibrin. Intriguingly,
n3:mentions
n2:23504606
Subject Item
_:vb51138886
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n3:Context
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Intriguingly, plasminogen activation on the endothelium can take place in the absence of fibrin when the uPA receptor is expressed [>>63<<]. This, amongst others, occurs during tissue injury and hypoxia and makes it attractive to speculate that plasmin may have additional functions beyond fibrinolysis.
n3:mentions
n2:1829461
Subject Item
_:vb51138887
rdf:type
n6:Section
dc:title
bradykinin-mediated angioedema
n6:contains
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Subject Item
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Most HAE patients have SERPING1 gene mutations (encoding for C1-inhibitor (C1-INH) production) [>>14<<, 15] while a small minority have mutations in the F12 gene, with normal C1-INH activity [16–20].
n3:mentions
n2:20889195
Subject Item
_:vb51138889
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Most HAE patients have SERPING1 gene mutations (encoding for C1-inhibitor (C1-INH) production) [14, >>15<<] while a small minority have mutations in the F12 gene, with normal C1-INH activity [16–20].
n3:mentions
n2:18758157
Subject Item
_:vb51138890
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Most HAE patients have SERPING1 gene mutations (encoding for C1-inhibitor (C1-INH) production) [14, 15] while a small minority have mutations in the F12 gene, with normal C1-INH activity [>>16<<–20].
n3:mentions
n2:26392288 n2:17186468 n2:21849258 n2:25524745 n2:16638441
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Attacks can be life-threatening when swelling compromises the airways, and extremely painful when located in the intestine [>>21<<, 22]. Therapy targeting the contact system has been successful in HAE, strongly supporting the concept that angioedema is mediated via bradykinin production [23–25]. Evidence for bradykinin involvement in angioedema is not limited to HAE.
n3:mentions
n2:22305226
Subject Item
_:vb51138892
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n3:Context
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Attacks can be life-threatening when swelling compromises the airways, and extremely painful when located in the intestine [21, >>22<<]. Therapy targeting the contact system has been successful in HAE, strongly supporting the concept that angioedema is mediated via bradykinin production [23–25]. Evidence for bradykinin involvement in angioedema is not limited to HAE.
n3:mentions
n2:25527240
Subject Item
_:vb51138893
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Therapy targeting the contact system has been successful in HAE, strongly supporting the concept that angioedema is mediated via bradykinin production [>>23<<–25]. Evidence for bradykinin involvement in angioedema is not limited to HAE. First, a comparable phenotype can be observed in patients that have acquired C1-INH deficiency due to underlying auto-immune or lymphoproliferative disease [26,
n3:mentions
n2:20818887 n2:20818888 n2:19264579
Subject Item
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First, a comparable phenotype can be observed in patients that have acquired C1-INH deficiency due to underlying auto-immune or lymphoproliferative disease [>>26<<, 27]. Second, anti-hypertensive drugs that inhibit bradykinin breakdown, such as angiotensin-converting enzyme (ACE), dipeptidyl peptidase IV (DPPIV) or neprilysin (NEP), can induce angioedema. During clinical trials of NEP inhibitors
n3:mentions
n2:26068904
Subject Item
_:vb51138895
rdf:type
n3:Context
rdf:value
First, a comparable phenotype can be observed in patients that have acquired C1-INH deficiency due to underlying auto-immune or lymphoproliferative disease [26, >>27<<]. Second, anti-hypertensive drugs that inhibit bradykinin breakdown, such as angiotensin-converting enzyme (ACE), dipeptidyl peptidase IV (DPPIV) or neprilysin (NEP), can induce angioedema. During clinical trials of NEP inhibitors [28],
n3:mentions
n2:15047756
Subject Item
_:vb51138896
rdf:type
n3:Context
rdf:value
During clinical trials of NEP inhibitors [>>28<<], up to 2.17 % of patients and 0.2–0.65 % of patients prescribed ACE inhibitors developed angioedema [29, 30].
n3:mentions
n2:25176015
Subject Item
_:vb51138897
rdf:type
n3:Context
rdf:value
During clinical trials of NEP inhibitors [28], up to 2.17 % of patients and 0.2–0.65 % of patients prescribed ACE inhibitors developed angioedema [>>29<<, 30].
n3:mentions
n2:18413488
Subject Item
_:vb51138898
rdf:type
n3:Context
rdf:value
During clinical trials of NEP inhibitors [28], up to 2.17 % of patients and 0.2–0.65 % of patients prescribed ACE inhibitors developed angioedema [29, >>30<<].
n3:mentions
n2:16043683
Subject Item
_:vb51138899
rdf:type
n3:Context
rdf:value
Evidently, contact activation is closely linked to the coagulation system [>>31<<–33]. Activation of coagulation and fibrinolysis during HAE attacks has been repeatedly reported [34–47].
n3:mentions
n2:10469157 n2:1833421
Subject Item
_:vb51138900
rdf:type
n3:Context
rdf:value
Activation of coagulation and fibrinolysis during HAE attacks has been repeatedly reported [>>34<<–47]. Yet, HAE patients present with swellings but not with thrombotic tendency [37]. Combined genetic and clinical findings suggest that a subset of coagulation factors are actively involved in angioedema attacks.
n3:mentions
n2:25640891 n2:22171564 n2:7172497 n2:19474702 n2:3146615 n2:20143645 n2:8711433 n2:25952149 n2:26452350 n2:9129025 n2:22288590 n2:8426080 n2:8426075
Subject Item
_:vb51138901
rdf:type
n3:Context
rdf:value
Yet, HAE patients present with swellings but not with thrombotic tendency [>>37<<]. Combined genetic and clinical findings suggest that a subset of coagulation factors are actively involved in angioedema attacks.
n3:mentions
n2:25640891
Subject Item
_:vb51138902
rdf:type
n6:Section
dc:title
a functional link between plasminogen activation and contact system activation
n6:contains
_:vb51138920 _:vb51138921 _:vb51138922 _:vb51138923 _:vb51138916 _:vb51138917 _:vb51138918 _:vb51138919 _:vb51138912 _:vb51138913 _:vb51138914 _:vb51138915 _:vb51138908 _:vb51138909 _:vb51138910 _:vb51138911 _:vb51138904 _:vb51138905 _:vb51138906 _:vb51138907 _:vb51138903
Subject Item
_:vb51138903
rdf:type
n3:Context
rdf:value
Besides that, FXII is also capable of activation of plasminogen [>>33<<, 64, 65]. Compared to tPA and uPA, FXIIa is a relatively weak plasminogen activator.
n3:mentions
n2:10469157
Subject Item
_:vb51138904
rdf:type
n3:Context
rdf:value
Besides that, FXII is also capable of activation of plasminogen [33, >>64<<, 65]. Compared to tPA and uPA, FXIIa is a relatively weak plasminogen activator.
n3:mentions
n2:659637
Subject Item
_:vb51138905
rdf:type
n3:Context
rdf:value
Besides that, FXII is also capable of activation of plasminogen [33, 64, >>65<<]. Compared to tPA and uPA, FXIIa is a relatively weak plasminogen activator.
n3:mentions
n2:8585009
Subject Item
_:vb51138906
rdf:type
n3:Context
rdf:value
However, population studies have proposed that FXIIa may protect against cardiovascular disease via plasminogen activation [>>66<<, 67]. This may be attributable to additional interactions between the contact system and the fibrinolytic system: FXIIa can enzymatically inactivate PAI-1 [68], whereas PK stimulates uPA activation on the endothelium [65].
n3:mentions
n2:8325306
Subject Item
_:vb51138907
rdf:type
n3:Context
rdf:value
However, population studies have proposed that FXIIa may protect against cardiovascular disease via plasminogen activation [66, >>67<<]. This may be attributable to additional interactions between the contact system and the fibrinolytic system: FXIIa can enzymatically inactivate PAI-1 [68], whereas PK stimulates uPA activation on the endothelium [65].
n3:mentions
n2:17723129
Subject Item
_:vb51138908
rdf:type
n3:Context
rdf:value
This may be attributable to additional interactions between the contact system and the fibrinolytic system: FXIIa can enzymatically inactivate PAI-1 [>>68<<], whereas PK stimulates uPA activation on the endothelium [65].
n3:mentions
n2:19500599
Subject Item
_:vb51138909
rdf:type
n3:Context
rdf:value
This may be attributable to additional interactions between the contact system and the fibrinolytic system: FXIIa can enzymatically inactivate PAI-1 [68], whereas PK stimulates uPA activation on the endothelium [>>65<<].
n3:mentions
n2:8585009
Subject Item
_:vb51138910
rdf:type
n3:Context
rdf:value
It has been demonstrated that plasmin can induce FXII activation in vitro [>>69<<]. In line with this finding, patients with myocardial infarction treated with therapeutic plasminogen-activating agents, such as streptokinase or recombinant tPA (r-tPA), showed increased plasma levels of cleaved HK (a surrogate marker
n3:mentions
n2:7805216
Subject Item
_:vb51138911
rdf:type
n3:Context
rdf:value
patients with myocardial infarction treated with therapeutic plasminogen-activating agents, such as streptokinase or recombinant tPA (r-tPA), showed increased plasma levels of cleaved HK (a surrogate marker for bradykinin release) [>>69<<] and elevated plasma levels of FXIIa [70]. Other clinical observations also support the importance of plasmin as a natural FXII activator.
n3:mentions
n2:7805216
Subject Item
_:vb51138912
rdf:type
n3:Context
rdf:value
treated with therapeutic plasminogen-activating agents, such as streptokinase or recombinant tPA (r-tPA), showed increased plasma levels of cleaved HK (a surrogate marker for bradykinin release) [69] and elevated plasma levels of FXIIa [>>70<<]. Other clinical observations also support the importance of plasmin as a natural FXII activator.
n3:mentions
n2:17111198
Subject Item
_:vb51138913
rdf:type
n3:Context
rdf:value
Neurologists repeatedly reported angioedema, which is presumably mediated via bradykinin, as a side effect of plasminogen activators given to patients with ischaemic stroke [>>71<<–82]. Up to 8 % of stroke patients receiving r-tPA develop angioedema, often located in the oral cavity and lingual region and contralateral to the infarction site [83]. Similar observations were made with other thrombolytic agents [84–86].
n3:mentions
n2:25802571 n2:24350070 n2:22791493 n2:22399862 n2:25053461 n2:24247033 n2:25434502 n2:25671036 n2:24909847 n2:24974191 n2:24620962 n2:25440357
Subject Item
_:vb51138914
rdf:type
n3:Context
rdf:value
Up to 8 % of stroke patients receiving r-tPA develop angioedema, often located in the oral cavity and lingual region and contralateral to the infarction site [>>83<<]. Similar observations were made with other thrombolytic agents [84–86]. A study with 42 post-r-tPA angioedema cases reported that five patients required emergency intubation or cricothyroidotomy due to laryngeal swelling, with fatal
n3:mentions
n2:25016564
Subject Item
_:vb51138915
rdf:type
n3:Context
rdf:value
Similar observations were made with other thrombolytic agents [>>84<<–86]. A study with 42 post-r-tPA angioedema cases reported that five patients required emergency intubation or cricothyroidotomy due to laryngeal swelling, with fatal outcome in two cases.
n3:mentions
n2:16113853 n2:7937456
Subject Item
_:vb51138916
rdf:type
n3:Context
rdf:value
Notably, concurrent use of ACE inhibitors is also reported in patients who developed angioedema during r-tPA treatment [>>78<<, 79, 83]. Evidence for plasmin-dependent bradykinin generation as a cause of angioedema during treatment with fibrinolytic agents is accumulating. However, the majority of these adverse reactions are still treated as a histamine-driven
n3:mentions
n2:24909847
Subject Item
_:vb51138917
rdf:type
n3:Context
rdf:value
Notably, concurrent use of ACE inhibitors is also reported in patients who developed angioedema during r-tPA treatment [78, >>79<<, 83]. Evidence for plasmin-dependent bradykinin generation as a cause of angioedema during treatment with fibrinolytic agents is accumulating. However, the majority of these adverse reactions are still treated as a histamine-driven
n3:mentions
n2:24620962
Subject Item
_:vb51138918
rdf:type
n3:Context
rdf:value
Notably, concurrent use of ACE inhibitors is also reported in patients who developed angioedema during r-tPA treatment [78, 79, >>83<<]. Evidence for plasmin-dependent bradykinin generation as a cause of angioedema during treatment with fibrinolytic agents is accumulating. However, the majority of these adverse reactions are still treated as a histamine-driven
n3:mentions
n2:25016564
Subject Item
_:vb51138919
rdf:type
n3:Context
rdf:value
This is in good correspondence with the normal clotting times that were reported in FXII-HAE patients [>>18<<]. These patients’ plasma also did not become unusually active upon cleavage by plasma kallikrein. Detailed biochemical studies showed that these mutations introduce new cleavage sites in the FXII molecule. The mutated sites are
n3:mentions
n2:21849258
Subject Item
_:vb51138920
rdf:type
n3:Context
rdf:value
Anti-fibrinolytic therapy, mainly tranexamic acid, has been used as prophylactic therapy for HAE attacks since the 1970s [>>4<<, 88, 89]. Tranexamic acid is a lysine derivate (analogue) that binds to lysine-binding sites of plasminogen and thereby prevents its binding to fibrin and subsequent activation by tPA or uPA [90]. Moreover, HAE patients with normal C1-INH
n3:mentions
n2:25196353
Subject Item
_:vb51138921
rdf:type
n3:Context
rdf:value
Anti-fibrinolytic therapy, mainly tranexamic acid, has been used as prophylactic therapy for HAE attacks since the 1970s [4, >>88<<, 89]. Tranexamic acid is a lysine derivate (analogue) that binds to lysine-binding sites of plasminogen and thereby prevents its binding to fibrin and subsequent activation by tPA or uPA [90]. Moreover, HAE patients with normal C1-INH
n3:mentions
n2:4551861
Subject Item
_:vb51138922
rdf:type
n3:Context
rdf:value
Anti-fibrinolytic therapy, mainly tranexamic acid, has been used as prophylactic therapy for HAE attacks since the 1970s [4, 88, >>89<<]. Tranexamic acid is a lysine derivate (analogue) that binds to lysine-binding sites of plasminogen and thereby prevents its binding to fibrin and subsequent activation by tPA or uPA [90]. Moreover, HAE patients with normal C1-INH levels
n3:mentions
n2:4562897
Subject Item
_:vb51138923
rdf:type
n3:Context
rdf:value
Tranexamic acid is a lysine derivate (analogue) that binds to lysine-binding sites of plasminogen and thereby prevents its binding to fibrin and subsequent activation by tPA or uPA [>>90<<]. Moreover, HAE patients with normal C1-INH levels (i.e. FXII-HAE) have decreased levels of PAI-2 during remission compared to patients with HAE due to C1-INH deficiency [36]. This suggests that their angioedema episodes might have
n3:mentions
n2:25559460
Subject Item
_:vb51138924
rdf:type
n6:Section
dc:title
biomarkers of contact activation, fibrinolytic activity and coagulation in angioedema
n6:contains
_:vb51138932 _:vb51138933 _:vb51138934 _:vb51138935 _:vb51138928 _:vb51138929 _:vb51138930 _:vb51138931 _:vb51138940 _:vb51138941 _:vb51138942 _:vb51138943 _:vb51138936 _:vb51138937 _:vb51138938 _:vb51138939 _:vb51138925 _:vb51138926 _:vb51138927 _:vb51138944 _:vb51138945 _:vb51138946
Subject Item
_:vb51138925
rdf:type
n3:Context
rdf:value
Bradykinin is only present in the circulation for a few seconds after it is released from HK, due to rapid degradation by kininases [>>91<<] which complicates its detection.
n3:mentions
n2:10871321
Subject Item
_:vb51138926
rdf:type
n3:Context
rdf:value
Circulating cleaved HK seems to be among the most suitable biomarkers for contact activation since cleaved HK levels have been shown to correlate with attack frequency [>>92<<]. Currently, cleaved HK can be detected by immunoblotting [92]. This assay often shows profound cleavage of HK in citrated plasma from patients with C1-INH deficiency.
n3:mentions
n2:24552232
Subject Item
_:vb51138927
rdf:type
n3:Context
rdf:value
Currently, cleaved HK can be detected by immunoblotting [>>92<<]. This assay often shows profound cleavage of HK in citrated plasma from patients with C1-INH deficiency.
n3:mentions
n2:24552232
Subject Item
_:vb51138928
rdf:type
n3:Context
rdf:value
There is a large base of evidence that contact activation during angioedema attacks is accompanied by changes in the fibrinolytic and coagulation systems that could serve as disease biomarkers [>>34<<–47, 93–95].
n3:mentions
n2:22171564 n2:25640891 n2:7172497 n2:3146615 n2:19474702 n2:20143645 n2:25952149 n2:26452350 n2:9129025 n2:22288590 n2:8711433 n2:8426080 n2:8426075
Subject Item
_:vb51138929
rdf:type
n3:Context
rdf:value
There is a large base of evidence that contact activation during angioedema attacks is accompanied by changes in the fibrinolytic and coagulation systems that could serve as disease biomarkers [34–47, >>93<<–95]. The understanding that the contact system and fibrinolytic system are functionally linked sheds a new light on the repeatedly reported occurrence of increased levels of complexes of plasmin and its main inhibitor α2-antiplasmin (PAP)
n3:mentions
n2:2935973 n2:6517610 n2:19076541
Subject Item
_:vb51138930
rdf:type
n3:Context
rdf:value
system are functionally linked sheds a new light on the repeatedly reported occurrence of increased levels of complexes of plasmin and its main inhibitor α2-antiplasmin (PAP) and decreased levels of PAI-1 measured during HAE attacks [>>34<<–36, 39, 40, 43, 44]. Fibrinolytic biomarkers may also be helpful in identifying bradykinin-mediated angioedema.
n3:mentions
n2:25952149 n2:26452350
Subject Item
_:vb51138931
rdf:type
n3:Context
rdf:value
are functionally linked sheds a new light on the repeatedly reported occurrence of increased levels of complexes of plasmin and its main inhibitor α2-antiplasmin (PAP) and decreased levels of PAI-1 measured during HAE attacks [34–36, >>39<<, 40, 43, 44]. Fibrinolytic biomarkers may also be helpful in identifying bradykinin-mediated angioedema.
n3:mentions
n2:22288590
Subject Item
_:vb51138932
rdf:type
n3:Context
rdf:value
functionally linked sheds a new light on the repeatedly reported occurrence of increased levels of complexes of plasmin and its main inhibitor α2-antiplasmin (PAP) and decreased levels of PAI-1 measured during HAE attacks [34–36, 39, >>40<<, 43, 44]. Fibrinolytic biomarkers may also be helpful in identifying bradykinin-mediated angioedema.
n3:mentions
n2:22171564
Subject Item
_:vb51138933
rdf:type
n3:Context
rdf:value
linked sheds a new light on the repeatedly reported occurrence of increased levels of complexes of plasmin and its main inhibitor α2-antiplasmin (PAP) and decreased levels of PAI-1 measured during HAE attacks [34–36, 39, 40, >>43<<, 44]. Fibrinolytic biomarkers may also be helpful in identifying bradykinin-mediated angioedema.
n3:mentions
n2:8711433
Subject Item
_:vb51138934
rdf:type
n3:Context
rdf:value
linked sheds a new light on the repeatedly reported occurrence of increased levels of complexes of plasmin and its main inhibitor α2-antiplasmin (PAP) and decreased levels of PAI-1 measured during HAE attacks [34–36, 39, 40, 43, >>44<<]. Fibrinolytic biomarkers may also be helpful in identifying bradykinin-mediated angioedema.
n3:mentions
n2:8426080
Subject Item
_:vb51138935
rdf:type
n3:Context
rdf:value
D-dimer levels are elevated during remission periods and markedly increase during attacks [>>34<<, 37, 39, 40, 93].
n3:mentions
n2:26452350
Subject Item
_:vb51138936
rdf:type
n3:Context
rdf:value
D-dimer levels are elevated during remission periods and markedly increase during attacks [34, >>37<<, 39, 40, 93].
n3:mentions
n2:25640891
Subject Item
_:vb51138937
rdf:type
n3:Context
rdf:value
D-dimer levels are elevated during remission periods and markedly increase during attacks [34, 37, >>39<<, 40, 93]. Also, thrombin-anti-thrombin complexes and prothrombin fragments F1+F2 increase during attacks [34, 39, 40, 42, 43, 93].
n3:mentions
n2:22288590
Subject Item
_:vb51138938
rdf:type
n3:Context
rdf:value
D-dimer levels are elevated during remission periods and markedly increase during attacks [34, 37, 39, >>40<<, 93]. Also, thrombin-anti-thrombin complexes and prothrombin fragments F1+F2 increase during attacks [34, 39, 40, 42, 43, 93].
n3:mentions
n2:22171564
Subject Item
_:vb51138939
rdf:type
n3:Context
rdf:value
D-dimer levels are elevated during remission periods and markedly increase during attacks [34, 37, 39, 40, >>93<<]. Also, thrombin-anti-thrombin complexes and prothrombin fragments F1+F2 increase during attacks [34, 39, 40, 42, 43, 93].
n3:mentions
n2:19076541
Subject Item
_:vb51138940
rdf:type
n3:Context
rdf:value
Also, thrombin-anti-thrombin complexes and prothrombin fragments F1+F2 increase during attacks [>>34<<, 39, 40, 42, 43, 93].
n3:mentions
n2:26452350
Subject Item
_:vb51138941
rdf:type
n3:Context
rdf:value
Also, thrombin-anti-thrombin complexes and prothrombin fragments F1+F2 increase during attacks [34, >>39<<, 40, 42, 43, 93].
n3:mentions
n2:22288590
Subject Item
_:vb51138942
rdf:type
n3:Context
rdf:value
Also, thrombin-anti-thrombin complexes and prothrombin fragments F1+F2 increase during attacks [34, 39, >>40<<, 42, 43, 93].
n3:mentions
n2:22171564
Subject Item
_:vb51138943
rdf:type
n3:Context
rdf:value
Also, thrombin-anti-thrombin complexes and prothrombin fragments F1+F2 increase during attacks [34, 39, 40, >>42<<, 43, 93].
n3:mentions
n2:9129025
Subject Item
_:vb51138944
rdf:type
n3:Context
rdf:value
Also, thrombin-anti-thrombin complexes and prothrombin fragments F1+F2 increase during attacks [34, 39, 40, 42, >>43<<, 93].
n3:mentions
n2:8711433
Subject Item
_:vb51138945
rdf:type
n3:Context
rdf:value
Also, thrombin-anti-thrombin complexes and prothrombin fragments F1+F2 increase during attacks [34, 39, 40, 42, 43, >>93<<].
n3:mentions
n2:19076541
Subject Item
_:vb51138946
rdf:type
n3:Context
rdf:value
Evidence for extrinsic pathway coagulation was demonstrated by a significant increase of FVIIa during angioedema attacks in 14 patients, by Cugno et al. [>>42<<]. It would be attractive to hypothesize that increased coagulation parameters in HAE are secondary to massive vascular leakage (Fig. 2). Even though biomarkers for coagulation, such as D-dimer, will not directly reflect bradykinin
n3:mentions
n2:9129025
Subject Item
_:vb51138947
rdf:type
n6:Section
dc:title
neutrophil activation and contact system activation are functionally linked
n6:contains
_:vb51138952 _:vb51138953 _:vb51138954 _:vb51138955 _:vb51138948 _:vb51138949 _:vb51138950 _:vb51138951
Subject Item
_:vb51138948
rdf:type
n3:Context
rdf:value
Recent work shows that HAE attacks are associated with increasing neutrophil counts and neutrophil elastase levels [>>96<<]. Neutrophils are important cells for the innate immunity. They migrate out of the bloodstream within hours after a pathogen is detected.
n3:mentions
n2:26654922
Subject Item
_:vb51138949
rdf:type
n3:Context
rdf:value
Migration of neutrophils to sites of inflammation is orchestrated by several mechanisms, such as chemotaxis by interleukins and complement factors and interaction of neutrophils with endothelial cell receptors [>>97<<]. It can be envisioned that neutrophils interact with the contact system to boost neutrophil extravasation by bradykinin-mediated vasodilatation. First of all, neutrophil elastase, released by active neutrophils, inactivates C1-INH
n3:mentions
n2:24940954
Subject Item
_:vb51138950
rdf:type
n3:Context
rdf:value
First of all, neutrophil elastase, released by active neutrophils, inactivates C1-INH thereby allowing contact activation to take place [>>98<<]. Second, in vitro studies show that the bradykinin B1 receptor (BKB1R) regulates neutrophil trafficking [99, 100]. Third, both kallikrein and FXIIa can induce neutrophil degranulation [101]. Finally, neutrophil extracellular traps (NETs)
n3:mentions
n2:6980881
Subject Item
_:vb51138951
rdf:type
n3:Context
rdf:value
Second, in vitro studies show that the bradykinin B1 receptor (BKB1R) regulates neutrophil trafficking [>>99<<, 100]. Third, both kallikrein and FXIIa can induce neutrophil degranulation [101]. Finally, neutrophil extracellular traps (NETs) have been shown to activate FXII. NETs exist of DNA, and the negative charge of DNA is believed to induce
n3:mentions
n2:14742641
Subject Item
_:vb51138952
rdf:type
n3:Context
rdf:value
Second, in vitro studies show that the bradykinin B1 receptor (BKB1R) regulates neutrophil trafficking [99, >>100<<]. Third, both kallikrein and FXIIa can induce neutrophil degranulation [101]. Finally, neutrophil extracellular traps (NETs) have been shown to activate FXII. NETs exist of DNA, and the negative charge of DNA is believed to induce
n3:mentions
n2:11258678
Subject Item
_:vb51138953
rdf:type
n3:Context
rdf:value
Third, both kallikrein and FXIIa can induce neutrophil degranulation [>>101<<]. Finally, neutrophil extracellular traps (NETs) have been shown to activate FXII.
n3:mentions
n2:3486686
Subject Item
_:vb51138954
rdf:type
n3:Context
rdf:value
NETs exist of DNA, and the negative charge of DNA is believed to induce auto-activation of FXII [>>102<<]. At the very least, NETs can sequester FXII and present it for activating cleavage. NETs are a binding site for antimicrobial proteins such as histones, neutrophil elastase and cathepsins [99]. To what extent the proteins loaded on NETs
n3:mentions
n2:20375580
Subject Item
_:vb51138955
rdf:type
n3:Context
rdf:value
NETs are a binding site for antimicrobial proteins such as histones, neutrophil elastase and cathepsins [>>99<<]. To what extent the proteins loaded on NETs contribute to neutrophil-induced FXII activation is not yet elucidated. The negative charge of NETs, in combination with potential FXII-activating enzymes, would make neutrophils a plausible
n3:mentions
n2:14742641
Subject Item
_:vb51138956
rdf:type
n6:Section
dc:title
mast cell activation is linked to bradykinin generation
n6:contains
_:vb51138964 _:vb51138965 _:vb51138966 _:vb51138967 _:vb51138960 _:vb51138961 _:vb51138962 _:vb51138963 _:vb51138968 _:vb51138969 _:vb51138957 _:vb51138958 _:vb51138959
Subject Item
_:vb51138957
rdf:type
n3:Context
rdf:value
Indeed, anti-histamine therapy reduces the occurrence of angioedema in urticaria patients [>>2<<]. It should be noted that plasma bradykinin levels were not found elevated in four patients with an acute attack of anti-histamine-sensitive angioedema [103]. Yet, evidence accumulates that angioedema in allergic reactions is also
n3:mentions
n2:24785199
Subject Item
_:vb51138958
rdf:type
n3:Context
rdf:value
It should be noted that plasma bradykinin levels were not found elevated in four patients with an acute attack of anti-histamine-sensitive angioedema [>>103<<]. Yet, evidence accumulates that angioedema in allergic reactions is also accompanied by bradykinin release. FXIIa-C1-INH complexes and kallikrein-C1-INH complexes were increased up to tenfold, within minutes after experimental insect
n3:mentions
n2:12192030
Subject Item
_:vb51138959
rdf:type
n3:Context
rdf:value
FXIIa-C1-INH complexes and kallikrein-C1-INH complexes were increased up to tenfold, within minutes after experimental insect stings in six allergic patients who developed shock or angioedema [>>1<<]. In contrast, patients who only developed urticarial rash in reaction to the venom showed a non-significant increase in C1-INH complexes. In line with these results, it was shown that in the patients with angioedema or shock, a third up
n3:mentions
n2:8400230
Subject Item
_:vb51138960
rdf:type
n3:Context
rdf:value
In line with these results, it was shown that in the patients with angioedema or shock, a third up to half of the total pool of plasma HK was cleaved within minutes [>>1<<]. These results were confirmed in another study where HK was analysed in patients with an anaphylactic reaction (mainly induced by food allergens) [104]. In this study, even patients with a mild reaction (i.e. gastro-intestinal
n3:mentions
n2:8400230
Subject Item
_:vb51138961
rdf:type
n3:Context
rdf:value
These results were confirmed in another study where HK was analysed in patients with an anaphylactic reaction (mainly induced by food allergens) [>>104<<]. In this study, even patients with a mild reaction (i.e. gastro-intestinal complaints) showed 60 % cleavage of their HK pool. Evidence of the clinical relevance of bradykinin during anaphylaxis with hypotension was further demonstrated
n3:mentions
n2:25240785
Subject Item
_:vb51138962
rdf:type
n3:Context
rdf:value
Hypotension after IgE-mediated, antigen-induced anaphylaxis was reduced in FXII-deficient mice compared to wild-type mice [>>104<<]. The same protection toward IgE-mediated hypotension was reported in BKB2R knockout mice and HK- and PPK-deficient mice [105]. Although direct release of bradykinin from HK by tryptase could also contribute to these findings, it would be
n3:mentions
n2:25240785
Subject Item
_:vb51138963
rdf:type
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The same protection toward IgE-mediated hypotension was reported in BKB2R knockout mice and HK- and PPK-deficient mice [>>105<<]. Although direct release of bradykinin from HK by tryptase could also contribute to these findings, it would be reasonable to propose that bradykinin production during anaphylaxis is for a major part FXII-driven.
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Moreover, mast cell degranulation may trigger FXII activation via the release of heparin, which activates FXII in vitro and induces FXII-dependent hypotension in mice models [>>10<<]. Heparin-induced vascular leakage in mice was diminished by BKB2R antagonist (icatibant) and exaggerated in C1-INH-deficient mice [10].
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Heparin-induced vascular leakage in mice was diminished by BKB2R antagonist (icatibant) and exaggerated in C1-INH-deficient mice [>>10<<]. Heparin is a negatively charged compound, capable of inducing FXII auto-activation. However, like the NETs of neutrophils, heparin binds a large variety of proteins [106]. Contrary to this, a study of 14 HAE patients showed that
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However, like the NETs of neutrophils, heparin binds a large variety of proteins [>>106<<]. Contrary to this, a study of 14 HAE patients showed that tryptase levels do not increase during HAE attacks [107]. It might be helpful to keep in mind that in HAE patients that also suffer from allergies, attacks may be aggravated by an
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Current studies were unable so far to demonstrate bradykinin or an increased HK cleaving in such patients [>>103<<, 104, 108].
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Current studies were unable so far to demonstrate bradykinin or an increased HK cleaving in such patients [103, >>104<<, 108]. Considering the strong evidence of interaction between mast cells and bradykinin production, patients with idiopathic angioedema and recurrent swellings who fail to respond to high-dose anti-histamine treatment might benefit from
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Current studies were unable so far to demonstrate bradykinin or an increased HK cleaving in such patients [103, 104, >>108<<]. Considering the strong evidence of interaction between mast cells and bradykinin production, patients with idiopathic angioedema and recurrent swellings who fail to respond to high-dose anti-histamine treatment might benefit from
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