Elevated Plasma Factor IXa Activity in Premenopausal Women on Hormonal Contraception.

Arteriosclerosis, Thrombosis, and Vascular Biology
Pansakorn TanratanaJohn P Sheehan

Abstract

Combined oral contraceptives induce a reversible hypercoagulable state with an enhanced risk of venous thromboembolism, but the underlying mechanism(s) remain unclear. Subjects on combined oral contraceptives also demonstrate a characteristic resistance to APC (activated protein C) in the thrombin generation assay. Here, we report the potential role of plasma factor IXa (FIXa) as a mechanism for hormone-induced systemic hypercoagulability. A novel assay was used to determine FIXa activity in plasma samples from volunteer blood donors. Plasma from 36 premenopausal females on hormonal contraception and 35 not on hormonal contraception, 35 postmenopausal females, and 10 males were analyzed for FIXa activity, total PS (protein S), total tissue factor pathway inhibitor (TFPI), and TFPI-α antigen. Premenopausal females on hormonal contraception demonstrated significantly increased FIXa activity and decreased TFPI-α compared with the other groups. Remarkably, FIXa values were not normally distributed in the hormonal contraception group, but skewed toward the high end. Plasma FIXa activity inversely correlated with both TFPI-α and total PS antigen. Ex vivo determination of TF-dependent FIX activation in FV-deficient plasma demonstrated...Continue Reading

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Citations

Apr 27, 2018·Arteriosclerosis, Thrombosis, and Vascular Biology·Kimio Satoh, Hiroaki Shimokawa
Apr 23, 2020·Arteriosclerosis, Thrombosis, and Vascular Biology·Xian LiJeremy P Wood
May 26, 2018·Arteriosclerosis, Thrombosis, and Vascular Biology·Miao WangUNKNOWN Early Career Committee
May 23, 2019·Arteriosclerosis, Thrombosis, and Vascular Biology·Kimio SatohHiroaki Shimokawa
Sep 21, 2019·The Biochemical Journal·Tina M MisenheimerBradford S Schwartz

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