Molecular mechanism for transcriptional activation of ganglioside GM3 synthase and its function in differentiation of HL-60 cells

Glycobiology
Tae-Wook ChungCheorl-Ho Kim

Abstract

Previous studies have demonstrated that the activity of GM3 synthase and GM3 content are increased during the differentiation of human promyelocytic leukemia HL-60 cells into the monocyte/macrophage lineage after phorbol 12-myristate 13-acetate (PMA) treatment. However, the molecular mechanisms involved in transcriptional activation of GM3 synthase during differentiation of PMA-induced HL-60 cells are not well understood. As evidenced by western blot analysis, PMA induced the marked activation of protein kinase C (PKC)/extracellular regulated kinases (ERKs) signal transduction pathway during the differentiation of HL-60 cells. In addition, PKC/ERKs activation induced by PMA in HL-60 cells led to the phosphorylation of cAMP-responsive element binding protein (CREB) as a transcription factor. In PMA-stimulated HL-60 cells, the PKC/ERKs-dependent CREB activation regulated expression of GM3 synthase, inducing a synthesis of ganglioside GM3 product. On the other hand, although ganglioside GM3 was shown to be able to induce the differentiation of HL-60 cells into the monocyte/macrophage lineage, effect of ganglioside GM3 on expression of CD11b as a differentiation marker in HL-60 cells has been not reported yet. Interestingly, the in...Continue Reading

Citations

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