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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

1,25-Dihydroxy vitamin D3 and 12-O-tetradecanoyl phorbol-13-acetate synergistically induce monocytic cell differentiation: FOS and RB expression.

1,25-dihydroxy vitamin D3 and 12-O-tetradecanoyl phorbol-13-acetate (TPA) interact synergistically to induce monocytic differentiation of U937 histiocytic lymphoma cells. Addition of TPA causes an otherwise ineffective dose of 1,25-dihydroxy vitamin D3 to induce differentiation. The induced differentiation depends on the simultaneous (vs. sequential) presence of both agents. The kinetics of induced differentiation are consistent with a G1 specific cellular response to initiate the metabolic cascade culminating in cell differentiation. The induced differentiation occurs with down-regulation of c-fos protein and an accompanying up-regulation of RB protein expression, consistent with a possible need for up-regulated RB expression to maintain a given differentiated phenotype and suppress transcriptional activators that might typically be associated with proliferation.[1]


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