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Li YS , Zhou Y , Tang L , Shinton SA , Hayakawa K , Hardy RR
A developmental switch between fetal and adult B lymphopoiesis
Ann N Y Acad Sci. 2015 Dec;1362(1) :8-15
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Fluorescence-activated cell sorting (FACS)-purified pro-B cells from fetal liver and adult bone marrow generate B cells with distinct phenotypes: fetal cells generate few IgD(high) B cells and half express CD5, whereas adult cells generate mostly IgD(high) cells and few express CD5. These results led us to propose a model of a developmental switch in B lymphopoiesis, similar to the well-known switch in fetal to adult erythropoiesis. More recent global analysis of mRNA and microRNA expression comparing these two types of pro-B cells revealed differential expression of Lin28b and microRNAs from the Let-7 family, indicating that this regulatory axis plays a role in the switch. Further analysis has provided data supporting this model, implicating Arid3a as a key transcription factor in mediating fetal-type B cell development. Function of this regulatory axis in human B lineage precursors may also explain the predominance of CD5(+) B cells in cord blood. We suggest that Lin28b-promoted B cell development generates many cells expressing CD5 as a consequence of positively selected self-reactivity. While such cells serve a useful role in clearance of senescent cells and in certain immune responses, they also carry the risk of progression to leukemia/lymphoma later in life.
Li, Yue-Sheng Zhou, Yan Tang, Lingjuan Shinton, Susan A Hayakawa, Kyoko Hardy, Richard R eng R01 AI113320/AI/NIAID NIH HHS/ 2015/05/02 06:00 Ann N Y Acad Sci. 2015 Dec;1362(1):8-15. doi: 10.1111/nyas.12769. Epub 2015 Apr 30.