Prothrombin cleavage by human vascular smooth muscle cells: a potential alternative pathway to the coagulation cascade.

Abstract:

:Thrombin is a potent mitogen for human vascular smooth muscle cells (HVSMC) and its enzymatic activity is required for this function. The present study demonstrates that prothrombin is also mitogenic for HVSMC due to the generation of enzymatically active thrombin which occurs upon incubation of prothrombin with the cells. Analysis by SDS-PAGE, immunoblotting, and amino acid sequencing revealed that prothrombin incubated with HVSMC undergoes limited proteolysis. Prethrombin 1 was formed through cleavage at R155-S156. Cleavage at R271-T272 generated fragment 1.2 and prethrombin 2 whilst cleavage at R284-T285 yielded truncated prothrombin 2 (prethrombin 2'). However, cleavage at R320-I321 which, during prothrombin activation produces two-chain alpha-thrombin, was not detectable. Studies on HVSMC-conditioned medium revealed that a similar pattern of prothrombin cleavage occurred by a cell-secreted factor(s). Amidolytic activity analysis indicated that 1-3% catalytically active thrombin-like activity was generated upon incubation of prothrombin with HVSMC-conditioned medium. By treating conditioned medium with various classes of proteinase inhibitors or hirudin, it was determined that prothrombin is cleaved by a cell-derived serine proteinase-like factor(s) at R271-S272 and by alpha-thrombin at R155-S156 and R284-T285. Antibodies neutralising the activity of either urokinase, tissue plasminogen activator, or factor Xa failed to alter the prothrombin cleaving activity of conditioned medium. This activity which may catalyse an alternative pathway for the generation of thrombin, was eluted from a gel filtration column as a single peak with apparent molecular mass of 30-40 kDa.

journal_name

J Cell Biochem

authors

Benzakour O,Kanthou C,Lupu F,Dennehy U,Goodwin C,Scully MF,Kakkar VV,Cooper DN

doi

10.1002/jcb.240590411

subject

Has Abstract

pub_date

1995-12-01 00:00:00

pages

514-28

issue

4

eissn

0730-2312

issn

1097-4644

journal_volume

59

pub_type

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