Stage-specific functional roles of integrins in murine erythropoiesis.

ABSTRACT: When the erythroid integrins ?5?1 and ?4?1 were each deleted previously at the stem cell level, they yielded distinct physiologic responses to stress by affecting erythoid expansion and terminal differentiation or only the latter, respectively. To test at what stage of differentiation the integrin effects were exerted, we created mice with ?4- or ?5-integrin deletions only in erythroid cells and characterized them at homeostasis and after phenylhydrazine-induced hemolytic stress. Unlike our prior data, the phenotype of mice with ?5-erythroid deletions was similar to controls, especially after stress. These outcomes seem to reconcile divergent prior views on the role of ?5-integrin in erythropoiesis. By contrast, ?4 integrins whether deleted early or late have a dominant effect on bone marrow retention of erythroblasts and on terminal erythroid maturation at homeostasis and after stress.

SUBMITTER: Ulyanova T 

PROVIDER: S-EPMC4035461 | biostudies-literature | 2014 May

REPOSITORIES: biostudies-literature