Inhibition of MEK/ERK Signalling Pathway Promotes Erythroid Differentiation and Reduces HSCs Engraftment in Ex vivo Expanded Haematopoietic Stem Cells

Overview

Journal J Cell Mol Med

Specialties Cell Biology
Molecular Biology

Date 2017 Oct 11

PMID 28994199

Citations 10

Authors

Morteza Zarrabi

Elaheh Afzal

Mohammad Hossein Asghari

Monireh Mohammad

Hamidreza Aboulkheyr Es

Marzieh Ebrahimi

Affiliations

Soon will be listed here.

Abstract

The MEK/ERK pathway is found to be important in regulating different biological processes such as proliferation, differentiation and survival in a wide variety of cells. However, its role in self-renewal of haematopoietic stem cells is controversial and remains to be clarified. The aim of this study was to understand the role of MEK/ERK pathway in ex vivo expansion of mononuclear cells (MNCs) and purified CD34 cells, both derived from human umbilical cord blood (hUCB). Based on our results, culturing the cells in the presence of an inhibitor of MEK/ERK pathway-PD0325901 (PD)-significantly reduces the expansion of CD34 and CD34 CD38 cells, while there is no change in the expression of stemness-related genes (HOXB4, BMI1). Moreover, in vivo analysis demonstrates that PD reduces engraftment capacity of ex vivo expanded CD34 cells. Notably, when ERK pathway is blocked in UCB-MNCs, spontaneous erythroid differentiation is promoted, found in concomitant with increasing number of burst-forming unit-erythroid colony (BFU-E) as well as enhancement of erythroid glycophorin-A marker. These results are in total conformity with up-regulation of some erythroid enhancer genes (TAL1, GATA2, LMO2) and down-regulation of some erythroid repressor genes (JUN, PU1) as well. Taken together, our results support the idea that MEK/ERK pathway has a critical role in achieving the correct balance between self-renewal and differentiation of UCB cells. Also, we suggest that inhibition of ERK signalling could likely be a new key for erythroid induction of UCB-haematopoietic progenitor cells.

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