Journal
PLOS ONE
Volume 10, Issue 4, Pages -Publisher
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0123232
Keywords
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Categories
Funding
- Japan Society for the Promotion of Science [23591606, 22390216, 20238025, 23592423, 24590245, 25293241, 24659512, 24791726]
- Research for Promoting Technological Seeds [07-035]
- High-Technology Research Centre of Kanazawa Medical University [H2010-14]
- Science Research Promotion Fund from the Promotion and Mutual Aid Corporation for Private Schools of Japan
- Kanazawa Medical University [C2009-3, C2010-2, S2010-8, S2008-10, S1201022]
- Grants-in-Aid for Scientific Research [25293241, 24791726, 15K15405, 26462502, 23592423, 26670701, 15K09732, 24590245, 24659512, 22390216, 23591606] Funding Source: KAKEN
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In this study, we showed that adrenocorticotropic hormone (ACTH) promoted erythroblast differentiation and increased the enucleation ratio of erythroblasts. Because ACTH was contained in hematopoietic medium as contamination, the ratio decreased by the addition of anti-ACTH antibody (Ab). Addition of neutralizing Abs (nAbs) for melanocortin receptors (MCRs) caused erythroblast accumulation at specific stages, i.e., the addition of anti-MC2R nAb led to erythroblast accumulation at the basophilic stage (baso-E), the addition of anti-MC1R nAb caused accumulation at the polychromatic stage (poly-E), and the addition of anti-MC5R nAb caused accumulation at the orthochromatic stage (ortho-E). During erythroblast differentiation, ERK, STAT5, and AKT were consecutively phosphorylated by erythropoietin (EPO). ERK, STAT5, and AKT phosphorylation was inhibited by blocking MC2R, MC1R, and MC5R, respectively. Finally, the phosphorylation of myosin light chain 2, which is essential for the formation of contractile actomyosin rings, was inhibited by anti-MC5R nAb. Taken together, our study suggests that MC2R and MC1R signals are consecutively required for the regulation of EPO signal transduction in erythroblast differentiation, and that MC5R signal transduction is required to induce enucleation. Thus, melanocortin induces proliferation and differentiation at baso-E, and polarization and formation of an actomyosin contractile ring at ortho-E are required for enucleation.
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