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Biphenotypic B-lymphoid/myeloid cells expressing low levels of Pax5: potential targets of BAL development.

Abstract：

:The expression of Pax5 commits common lymphoid progenitor cells to B-lymphoid lineage differentiation. Little is known of possible variations in the levels of Pax5 expression and their influences on hematopoietic development. We have developed a retroviral transduction system that allows for the study of possible intermediate stages of this commitment by controlling the levels of Pax5 expressed in Pax5-deficient progenitors in vitro and in vivo. Retroviral transduction of Pax5-deficient pro-/pre-B cell lines with a doxycycline-inducible (TetON) form of the human Pax5 (huPax5) gene yielded cell clones that could be induced to different levels of huPax5 expression. Clones inducible to high levels developed B220(+)/CD19(+)/IgM(+) B cells, while clones with low levels differentiated to B220(+)/CD19(-)/CD11b(+)/Gr-1(-) B-lymphoid/myeloid biphenotypic cells in vitro and in vivo. Microarray analyses of genes expressed at these lower levels of huPax5 identified C/ebpα, C/ebpδ, Pu.1, Csf1r, Csf2r, and Gata-3 as myeloid-related genes selectively expressed in the pro-/pre-B cells that can develop under myeloid/lymphoid conditions to biphenotypic cells. Therefore, reduced expression of huPax5 during the induction of early lymphoid progenitors to B-lineage-committed cells can fix this cellular development at a stage that has previously been seen during embryonic development and in acute lymphoblastic lymphoma-like biphenotypic acute leukemias.

journal_name

Blood

journal_title

Blood

authors

Simmons S,Knoll M,Drewell C,Wolf I,Mollenkopf HJ,Bouquet C,Melchers F

doi

10.1182/blood-2012-03-414821

subject

Has Abstract

pub_date

2012-11-01 00:00:00

pages

3688-98

issue

18

eissn

0006-4971

issn

1528-0020

pii

blood-2012-03-414821

journal_volume

120

pub_type

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