Erschienen in:
15.09.2017 | Original Article
Platelet factor 4 increases bone marrow B cell development and differentiation
verfasst von:
David J. Field, Angela A. Aggrey-Amable, Sara K. Blick, Sara K. Ture, Andrew Johanson, Scott J. Cameron, Sukanya Roy, Craig N. Morrell
Erschienen in:
Immunologic Research
|
Ausgabe 5/2017
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Abstract
Platelet factor 4 (PF4) is a megakaryocyte-/platelet-derived chemokine with diverse functions as a regulator of vascular and immune biology. PF4 has a central role in vessel injury responses, innate immune cell responses, and T-helper cell differentiation. We have now discovered that PF4 has a direct role in B cell differentiation in the bone marrow. Mice lacking PF4 (PF4−/− mice) had fewer developing B cells in the bone marrow beginning after the pre-pro-B cell stage of differentiation. In vitro, PF4 increased the differentiation of hematopoietic progenitors to B cell lineage cells, indicating that PF4 has a direct effect on B cell differentiation. STAT5 activation is essential in early B cell development and PF4 increased the phosphorylation of STAT5. Taken together, these data demonstrate that PF4 has an important role in increasing B cell differentiation in the bone marrow environment.