Summary
3,4-dihydro-6-[4-(3,4-dimethoxybenzoyl)-1-piperazinyl]-2(1H)-quinolinone (OPC-8212) is a quinolinone derivative with positive inotropic properties.
In order to elucidate the effect of OPC-8212 on the haemopoietic system we studied its in vitro effect on bone-marrow progenitor cells (granulocyte/monocyte colonyforming units [CFU-GM] and erythroid burst-forming units [BFU-E]), on the proliferation and secretion of granulocyte/monocyte colony-stimulating factor (GM-CSF) and interferon-γ (IFN-γ) by peripheral lymphocytes, and on GM-CSF secretion by fibroblasts from healthy individuals. The dose-effect relations of OPC-8212 on CFU-GM proliferation and on lymphocytic GM-CSF secretion showed no effect at very low drug concentrations, with a threshold at the lower end of the therapeutic range and highly significant dose-dependent inhibition at concentrations above that threshold. BFU-E, peripheral lymphocyte proliferation and lymphocytic IFN-γ secretion were depressed, although to a lesser extent, in a linear dose-dependent fashion. OPC-8212 did not affect GM-CSF secretion by one strain of fibroblasts but reduced it at higher concentrations in assays with another strain of cells. We conclude that direct toxic effects on bone-marrow progenitor cells, in combination with the inhibition of cytokines involved in the regulation of haemopoiesis in certain susceptible individuals, may be responsible for idiosyncratic reactions to OPC-8212.
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Busch, F.W., Tillmann, A., Becker, E.W. et al. The inhibitory effects of a positive inotropic quinolinone derivative, 3,4-dihydro-6-[4-(3,4-dimethoxybenzoyl)-1-piperazinyl]-2(1H)-quinolinone (OPC-8212), on bone-marrow progenitor cells and peripheral lymphocytes. Eur J Clin Pharmacol 42, 629–633 (1992). https://doi.org/10.1007/BF00265927
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DOI: https://doi.org/10.1007/BF00265927