Both TMEM16F-dependent and TMEM16F-independent pathways contribute to phosphatidylserine exposure in platelet apoptosis and platelet activation.

Abstract:

:Scott syndrome, a bleeding disorder caused by defective phospholipid scrambling, has been associated with mutations in the TMEM16F gene. The role of TMEM16F in apoptosis- or agonist-induced phosphatidylserine (PS) exposure was studied in platelets from a Scott syndrome patient and control subjects. Whereas stimulation of control platelets with the BH3-mimetic ABT737 resulted in 2 distinct fractions with moderate and high PS exposure, the high PS-exposing fraction was markedly delayed in Scott platelets. High, but not moderate, PS exposure in platelets was suppressed by chelation of intracellular Ca(2+), whereas caspase inhibition completely abolished ABT737-induced PS exposure in both Scott and control platelets. On the other hand, high PS exposure induced by the Ca(2+)-mobilizing agonists convulxin/thrombin fully relied on mitochondrial depolarization and was virtually absent in Scott platelets. Finally, PS exposure induced by collagen/thrombin was partly affected in Scott platelets, and the residual PS positive fraction was insensitive to inhibition of caspases or mitochondrial depolarization. In conclusion, TMEM16F is not required for, but enhances, caspase-dependent PS exposure; convulxin-/thrombin-induced PS exposure is entirely dependent on TMEM16F, whereas collagen/thrombin-induced PS exposure results from 2 distinct pathways, one of which involves mitochondrial depolarization and is mediated by TMEM16F.

journal_name

Blood

journal_title

Blood

authors

van Kruchten R,Mattheij NJ,Saunders C,Feijge MA,Swieringa F,Wolfs JL,Collins PW,Heemskerk JW,Bevers EM

doi

10.1182/blood-2012-09-454314

subject

Has Abstract

pub_date

2013-03-07 00:00:00

pages

1850-7

issue

10

eissn

0006-4971

issn

1528-0020

pii

blood-2012-09-454314

journal_volume

121

pub_type

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