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• W2046912552 endingPage "1043" @default.
• W2046912552 startingPage "1036" @default.
• W2046912552 abstract "The biochemical effects of the non-12-0-tetradecanoylphorbol-13-acetate (TPA)-type tumor promoter thapsigargin (TG), which does not bind to the phorbol-ester receptor, or activate protein kinase C (PKC) or increase inositol polyphosphates, were characterized in mouse epidermis in vivo. The cold scraping method is required to detect the induction of ornithine decarboxylase (ODC) activity by TG, a response much smaller than that caused by TPA and with a different time course. TG pre-treatments do not alter or cause a refractory state against ODC induction by TPA. But TG stimulates hydroperoxide (HPx) production and RNA, protein, and DNA synthesis almost as much as TPA. Moreover, the sequential effects of TG and TPA on DNA synthesis are identical: early inhibition at 8 hr followed by maximal stimulation at 16-32 hr. TG-stimulated HPx production requires protein synthesis and xanthine oxidase, phospholipase A2, and lipoxygenase activities but not RNA and DNA synthesis, and cyclooxygenase and protease activities. The HPx response to TG is not mimicked by the PKC activator prostratin or inhibited by pre-treatments with prostratin or specific PKC inhibitors. However, the Ca(2+)-ATPase inhibitor cyclopiazonic acid and the Ca2+ ionophore and weak ODC inducer A23187 mimic remarkably the HPx responses to TG and TPA. Since TG and A23187 are known to be, respectively, weak and incomplete tumor promoters as compared with TPA, the present results suggest that the HPx responses common to Ca(2+)-mobilizing and TPA- or non-TPA-type agents are insufficient to achieve tumor promotion in the absence of major ODC induction." @default.
• W2046912552 created "2016-06-24" @default.
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• W2046912552 date "1993-12-02" @default.
• W2046912552 modified "2023-10-16" @default.
• W2046912552 title "Ability of the non-phorbol ester-type tumor-promoter thapsigargin to mimic the stimulatory effects of 12-0-tetradecanoylphorbol-13-acetate on ornithine decarboxylase activity, hydroperoxide production, and macromolecule synthesis in mouse epidermisIn vivo" @default.
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• W2046912552 doi "https://doi.org/10.1002/ijc.2910550626" @default.
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