Scientific background: |
YBX1(Y box binding protein 1), commonly referred to as "YB-1" by researchers, is a human protein. YB1 binding has an absolute requirement for the CCAAT box and relative specificity for the Y box. It has a molecular mass of 35,414 and contains 18% basic residues and putative nuclear localization signals. The YBX1 gene is mapped on 1p34.2. Ybx1 was highly expressed in mouse erythroid myeloid lymphoid clone-1 (EML), a hematopoietic precursor cell line, but that it was downregulated in myeloid progenitors and in Gmcsf-treated EML cells during myeloid differentiation. Ybx1 was expressed at high levels in myeloid leukemic cells at different developmental stages. Knockdown of YBX1 in a human leukemic cell line inhibited proliferation ability, induced apoptosis, and induced megakaryocytic differentiation in response to arsenic trioxide treatment. YBX1 is downregulated during myeloid differentiation and aberrant YBX1 expression in leukemic cells may contribute to leukemia development by blocking differentiation. |
References: |
1.Bhullar, J., Sollars, V. E. YBX1 expression and function in early hematopoiesis and leukemic cells. Immunogenetics 63: 337-350, 2011.
2.Fukada, T., Tonks, N. K. Identification of YB-1 as a regulator of PTP1B expression: implications for regulation of insulin and cytokine signaling. EMBO J. 22: 479-493, 2003.
3.Makino, Y., Ohga, T., Toh, S., Koike, K., Okumura, K., Wada, M., Kuwano, M., Kohno, K. Structural and functional analysis of the human Y-box binding protein (YB-1) gene promoter. Nucleic Acid Res. 24: 1873-1878, 1996.
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