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Abstract
Hepatocyte growth factor (HGF) is most likely a physiological hepatotrophic factor that triggers regeneration of the injured liver. Histamine may also be important in the pathophysiology of the injured liver. Previously we showed that histamine production was increased in liver macrophages of mice injected with CCl4, a well-known hepatotoxin. Therefore, it is likely that the biological actions of histamine in repairing processes of the injured liver are mediated by HGF. This study was aimed at examining the effects of histamine on production of HGF using, as a model, the human promyelocytic leukemia cells, HL-60. 12-o-Tetradecanoylphorbol-13-acetate (TPA) markedly stimulated HGF production and release from the cells; the maximal amount of HGF was released at a concentration of 3 ng/ml of TPA. Histamine significantly stimulated the TPA-induced HGF production and release in these cells, depending on incubation time and its dose. These actions of histamine were abrogated by a H2 receptor antagonist, ranitidine.