Thrombomodulin with the Asp468Tyr mutation is expressed on the cell surface with normal cofactor activity for protein C activation.

Abstract:

:Thrombomodulin (TM) is an endothelial cell glycoprotein that acts as an anticoagulant. Mutation in the TM gene is a potential risk factor for thrombosis. The first TM mutation identified was a heterozygous substitution of T for G at nucleotide position 1456, which predicted Asp468 with Tyr in a Ser/Thr-rich domain. To evaluate the reported TM gene mutation as a possible cause of thrombosis, we transiently tranfected a vector for TM gene carrying the mutation to mammalian COS7 cells. TM antigen levels in lysates of cells transfected with variant TM were comparable to those in preparations of normal TM. The TM cofactor activity for protein C (PC) activation on the variant TM-expressing cells was similar to that of the control. The Michaelis constant Km and Vmax. of variant TM for PC activation were shown to be similar compared to those of normal TM. The affinity of each TM for thrombin in PC activation was also similar. We obtained several stable cell lines expressing normal and variant TM. Lysate of the cell lines with normal and variant TM genes had a similar expression level of TM antigen. Pulse-chase analysis showed that normal and variant TM were glycosylated and resistant to endoglycosidase H, indicating that the variant TM was expressed on the cell surface in a mature form. Variant TM protein is apparently expressed on the cell surface with normal cofactor activity for PC activation. It is unlikely that the TM variant directly causes thrombosis by mechanism of reduced expression or impaired cofactor activity for PC activation, which comprises a major anticoagulant activity of TM.

journal_name

Br J Haematol

authors

Nakazawa F,Koyama T,Saito T,Shibakura M,Yoshinaga H,Chung DH,Kamiyama R,Hirosawa S

doi

10.1046/j.1365-2141.1999.01567.x

subject

Has Abstract

pub_date

1999-08-01 00:00:00

pages

416-20

issue

2

eissn

0007-1048

issn

1365-2141

pii

bjh1567

journal_volume

106

pub_type

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