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  • Title: [The role of signal transduction systems in the regulation of production and secretion of TA-4 by cultured cervical epidermoid carcinoma cells (CaSki)].
    Author: Nishino R, Maruo T, Matsuo H, Mochizuki M.
    Journal: Nihon Sanka Fujinka Gakkai Zasshi; 1992 Apr; 44(4):447-52. PubMed ID: 1607773.
    Abstract:
    The CaSki cell line derived from an epidermoid carcinoma of the uterine cervix produces and releases a tumor associated-antigen, TA-4. The authors have already reported that EGF stimulated the production and secretion of TA-4 by the CaSki cells. EGF receptor is known to be one of the proteins phosphorylated by C-kinase. In order to elucidate a possible role of signal transduction systems (cAMP-A-kinase, diacyglycerol-C-kinase and Ca(2+)-calmodulin) in the regulation of TA-4 production and secretion by human cervical epidermoid carcinoma cells, the effects of cholera toxin (CT), an activator of adenylate cyclase, phorbol 12-myristate 13-acetate (PMA), a protein kinase C activator, and Ca2+ ionophore A23187, an activator of Ca2+ modulation on TA-4 production and secretion by CaSki cells were evaluated. TA-4 in the cultured cells and media were measured with a SCC RIA-Kit. The addition of PMA or Ca2+ ionophore to the medium caused increases in the cellular levels of TA-4 and TA-4 levels in the medium in a dose-dependent manner shortly after the addition. Combined treatment with PMA and Ca2+ ionophore did not cause additive increases in TA-4 levels in the cells and medium compared to the treatment with PMA alone or Ca2+ ionophore alone.(ABSTRACT TRUNCATED AT 250 WORDS)
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