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Charged Amino Acid-rich Leucine Zipper-1 (Crlz-1) as a Target of Wnt Signaling Pathway Controls Pre-B Cell Proliferation by Affecting Runx/CBF?-targeted VpreB and ?5 Genes* #MMPMID27226553
Choi SY; Park SK; Yoo HW; Pi JH; Kang CJ
J Biol Chem 2016[Jul]; 291 (29): 15008-19 PMID27226553show ga
The proliferation of pre-B cells is known to further increase the clonal diversity of B cells at the stage of pre-B cells by allowing the same rearranged heavy chains to combine with differently rearranged light chains in a subsequent developmental stage. Crlz-1 (charged amino acid-rich leucine zipper-1) was found to control this proliferation of pre-B cells by working as a Wnt (wingless-related mouse mammary tumor virus integration site) target gene in these cells. Mechanistically, Crlz-1 protein functioned by mobilizing cytoplasmic CBF? (core binding factor ?) into the nucleus to allow Runx (runt-related transcription factor)/CBF? heterodimerization. Runx/CBF? then turned on its target genes such as EBF (early B cell factor), VpreB, and ?5 and thereby pre-B cell receptor signaling, leading to the expression of cyclins D2 and D3. Actually, the proliferative function of Crlz-1 was demonstrated by not only Crlz-1 or ?-catenin knockdown but also Crlz-1 overexpression. Furthermore, the mechanistic view that the proliferative function of Crlz-1 is caused by relaying Wnt/?-catenin to pre-B cell receptor signaling pathways through the regulation of Runx/CBF? heterodimerization was also verified by employing niclosamide, XAV939, and LiCl as Wnt inhibitors and activator, respectively.