MKL1 and MKL2 Play Redundant and Crucial Roles in Megakaryocyte Maturation and Platelet Formation

Overview

Journal Blood

Publisher Elsevier

Specialty Hematology

Date 2012 Jul 19

PMID 22806889

Citations 37

Authors

Elenoe C Smith

Jonathan N Thon

Matthew T Devine

Sharon Lin

Vincent P Schulz

Yanwen Guo

Stephanie A Massaro

Stephanie Halene

Patrick Gallagher

Joseph E Italiano Jr

Diane S Krause

Affiliations

Soon will be listed here.

Abstract

Serum response factor and its transcriptional cofactor MKL1 are critical for megakaryocyte maturation and platelet formation. We show that MKL2, a homologue of MKL1, is expressed in megakaryocytes and plays a role in megakaryocyte maturation. Using a megakaryocyte-specific Mkl2 knockout (KO) mouse on the conventional Mkl1 KO background to produce double KO (DKO) megakaryocytes and platelets, a critical role for MKL2 is revealed. The decrease in megakaryocyte ploidy and platelet counts of DKO mice is more severe than in Mkl1 KO mice. Platelet dysfunction in DKO mice is revealed by prolonged bleeding times and ineffective platelet activation in vitro in response to adenosine 5'-diphosphate. Electron microscopy and immunofluorescence of DKO megakaryocytes and platelets indicate abnormal cytoskeletal and membrane organization with decreased granule complexity. Surprisingly, the DKO mice have a more extreme thrombocytopenia than mice lacking serum response factor (SRF) expression in the megakaryocyte compartment. Comparison of gene expression reveals approximately 4400 genes whose expression is differentially affected in DKO compared with megakaryocytes deficient in SRF, strongly suggesting that MKL1 and MKL2 have both SRF-dependent and SRF-independent activity in megakaryocytopoiesis.

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