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

Reversible inhibition of the hydrocortisone induction of glycerol phosphate dehydrogenase by cytochalasin B in rat glial C6 cells.

The hydrocortisone (HC) induction of glycerol phosphate dehydrogenase (GPDH; EC in rat glial C6 cells was inhibited reversibly and in a dose-dependent manner by cytochalasin B (CB). CB had no effect on basal level GPDH, total cellular RNA, DNA or protein content nor did it act as a general inhibitor of the rate of protein synthesis. CB did not appear to be acting via dissociation of microtubules since colcemid had no effect on the induction process. The addition of an alternate energy source (sodium pyruvate) did not relieve the CB inhibition of GPDH induction suggesting that CB is not exerting its effect by blocking glucose utilization. The inhibition by CB is not dependent on the temporal sequence of the induction process since it specifically inhibited GPDH induction at any time it was added. CB did not alter the rate of degradation of GPDH in these cells and direct measurements of the specific rate of synthesis of GPDH demonstrated that CB decreased the induced rate of GPDH synthesis by about 60%. The site of inhibition was more precisely defined by experiments which demonstrated a 60% decrease in specific nuclear binding of 3H-HC even though total cellular uptake of 3H-HC was unaffected. This effect on nuclear binding of HC is sufficient to account for the decreased accumulation of GPDH activity in CB-treated cells.[1]


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