Blood:C1抑制剂正常的遗传性血管性水肿的发病机制

2019-01-16 MedSci MedSci原创

血浆蛋白凝血因子XII(FXII)和血管舒张素酶原相互激活,形成蛋白酶FXIIa和血管舒张素的过程,通过表面(接触激活)增强,并受丝氨酸蛋白酶C1-抑制剂的调控。血管舒张素裂解大分子激肽原(HK),释放血管活性肽缓激肽。遗传性血管水肿(HAE)患者因血管舒张素活性失调或血管舒张素酶原激活增多,导致软组织肿胀发作。虽然大部分HAE病例是由于血浆C1-抑制剂活性降低导致的,但一直以来,HAE还与FXI

血浆蛋白凝血因子XII(FXII)和血管舒张素酶原相互激活,形成蛋白酶FXIIa和血管舒张素的过程,通过表面(接触激活)增强,并受丝氨酸蛋白酶C1-抑制剂的调控。血管舒张素裂解大分子激肽原(HK),释放血管活性肽缓激肽。遗传性血管水肿(HAE)患者因血管舒张素活性失调或血管舒张素酶原激活增多,导致软组织肿胀发作。虽然大部分HAE病例是由于血浆C1-抑制剂活性降低导致的,但一直以来,HAE还与FXII的Thr309被赖氨酸/精氨酸取代(FXII-Lys/Arg309)有关。

近期,Ivan Ivanov等人发现FXII-Lys/Arg309在309残基之后的部分容易被凝固蛋白酶(凝血酶和凝血因子XIa)裂解掉,导致产生一种截断的FXII(δFXII)。δFXII被血管舒张素激活的催化效率比FXII全长高15倍。

在人类和小鼠血浆中,PK和δFXII相互激活的增强率似乎可压倒C1抑制剂的正常抑制功能,导致HK裂解增多。在给予了人FXII-Lys/Arg309的小鼠中,通过灌注组织因子诱导凝血酶产生可通过形成δFXII增强HK裂解。此外,在体内外,可通过FXII重链(15H8)抗体结合野生型FXII产生δFXII的效应。

总而言之,本研究不仅有助于我们理解携带FXII-Lys/Arg309的患者为何在创伤后容易发生血管水肿,而且揭示了FXII重链的调节功能——限制血浆PK的激活。

原始出处:

Ivan Ivanov, et al.A mechanism for hereditary angioedema with normal C1-inhibitor: an inhibitory regulatory role for the factor XII heavy chain.Blood 2018 :blood-2018-06-860270; doi: https://doi.org/10.1182/blood-2018-06-860270 

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    2019-09-25 jklm09
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    2019-01-17 小华子
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    2019-01-16 txqjm

    谢谢了,学习

    0

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    2019-01-16 yjs木玉

    好好好好好好好好

    0

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