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International Journal of Hematology Potential role of activated factor VIII (FVllla) in FVlla/tissue factor-dependent FXa generation in initiation phase of blood coagulation

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I n t e r n a t i o n a

l J o u r n a l o f H e m a t o l o g y P

o t e n t i a

l o e l o r a f d e t a v i t c r o t c a f I I I V ) a l l l V F ( F n i e u s s i t / a l l V t e n n d e p e - d o r c t f a F X a g

e n e r a t i o

n i n n o i i t a i t i n p h a s e b f o o o d l n i o t a u l g a c o

Order of Authors Secondary :oniatmorfIn

I Question

- - M a n u s c r i p

t - - t f a r D

K e i j

i Nogami , M ..D.Ph.,D Nara Medical Uni verytis K

a

shihara , JAPAN

K e i j i Nogami

K e n i c h i Ogiwara

M i d o r i Shima

F a c t o

r eusist/iaIV rotcfa Flla/T(FV ) iitna ti bes lood ionlataguco by promoting FXa g

e n e r a t i o

n snirtxe( i-Xa)c . Subsequent genera noit of r itni c FX a (isn aX-cisnirtni ) ampl ie s if thrombin r mofn.tioa Preousvi u dtses si uggested taht FVlla/T F astevaict FVlll r

a p i d l

y inimm edia te coagu ltiao『ト,sniotcare and FVlla/TF /FX a act it eav s FlllV roirp ot t

h r o m b i

n -dependent feedback. We ideatgtiesvn alVlF/lllVF /TF/FXa relhnstioa ips in e

ar l cyoag ua tlo n i mechan isms . Tota l FXa generated by FVlla/TF and FF-la/TVl a

c t i v a t e

d lllVF (FVl)FT/allVall was 22.6±1 . nM (7 m1 in ) t;a l to FXa wthi aVllF inhb iirot 3

.

4 士0.7 nM; whe reas FXa gene rated by Fla/TFVl o r FVlllf

「

Fwas 10.4±1 .1 or 0

.74±0.14 nM, res peylevitc 町elttiL

×

a w as generated by FVl alle,onl gsuggestin that

i n t r i n s i c - X

a mec hanisms were mediated by FlallV Vla /l TF and FVlFT/ll tni ihe niitait o n- phase . lt rninsic-X a was delayed some what by von Wbllei rand frocta (VWF) . FVlll

by FX a wi Fht Vlla/TF was comparab le t aovict atnoi with Gl- Guly-Arg - i

n a c t i

v atedFVl- la/TF. TF cout en 『a ctd te he itibihn ory 巴ffe cts of VWF on FXa-indu ced F

V l l

l ct iavatnoi med iated by Arg372 cleavage . The FVll -Cl 2 doma i bnound ot c

ytmicoplas doma in dtedele TF (TF1 243 ), and VWF blocke d this bngdiin by >80 %, i

n d i c a t i n

g an olapver between VWF- and TF1 同bi43-2 「gindi sie(s) t on C2. Ollrave , these d

a t a

suggest hat t FV I I卜assoc atied itrin nsci司Xa, governed by both FaVll /ndTF-i uced and FXa- idu cn ed FlllV i vtcai o ta n med iated by FllV 卜TF it enrac tios, tn oge the w ir ht F

V l

l a-depe ndent extrs ini c回Xa mecha nisms, may be cenr a t l to the iitin atn -oi phas e of coagultiao n .

D ear R eviewer

Thank you very muc h yrof our response.

Response

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te fhtsri author nsit a mo ember of the ts! riF author :Sho ko Furukawa

!Japane 凶 ico叫 州ematolo 叫 USO 判tySocie mem 阿 number:6002714

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