Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\28580443
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Blood+Adv
2017 ; 1
(6
): 386-395
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Reduced Prothrombinase Inhibition by Tissue Factor Pathway Inhibitor Contributes
to the Factor V Leiden Hypercoagulable State
#MMPMID28580443
Wood JP
; Baumann Kreuziger LM
; Ellery PER
; Maroney SA
; Mast AE
Blood Adv
2017[Feb]; 1
(6
): 386-395
PMID28580443
show ga
Activated factor V (FVa) and factor X (FXa) form prothrombinase, which converts
prothrombin to thrombin. The ? isoform of tissue factor (TF) pathway inhibitor
(TFPI) dampens early procoagulant events, partly by interacting with FV. FV
Leiden (FVL) is the most common genetic thrombophilia in Caucasians. Thrombosis
risk is particularly elevated in women with FVL taking oral contraceptives, which
produce acquired TFPI? deficiency. In mice, FVL combined with 50% reduction in
TFPI causes severe thrombosis and perinatal lethality. However, a possible
interaction between FVL and TFPI? has not been defined in humans. Here, we
examined this interaction using samples from patients with FVL in thrombin
generation and fibrin formation assays. In dilute TF- or FXa-initiated reactions,
these studies exposed a TFPI-dependent activation threshold for coagulation
initiation that was greatly reduced by FVL. The reduced threshold was
progressively overcome with higher concentrations of TF or FXa. Plasma assays
using anti-TFPI antibodies or a TFPI peptide that binds and inhibits FVa
demonstrated that the decreased activation threshold resulted from reduced TFPI?
inhibition of prothrombinase. In assays using purified proteins, TFPI? was a
1.7-fold weaker inhibitor of prothrombinase assembled with FVL than with FV.
Thus, FVL reduces the threshold for initiating coagulation, and this threshold is
further reduced in situations of low TFPI? concentration. Individuals with FVL
are likely prone to thrombosis in response to weak procoagulant stimuli that
would not initiate blood clot formation in individuals with FV.