Yao xue xue bao = Acta pharmaceutica Sinica · 2001
[Studies on the anti-tumorpromotion activities of dehydroepiandrosterone and its mechanism of action].
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Yang S, Fu Z D, Han R
Аннотация
AIM: To investigate the anti-tumorpromoting activity of dehydroepiandrosterone (DHEA) and its mechanism of action.
METHODS: Using croton oil-induced ear edema model and applying confocal laser scanning microscopy, flow cytometry, immuno-fluorescent techniques to investigate the inhibitory effect of DHEA on tumor promotion.
RESULTS: DHEA 25 mg.kg-1 was shown to inhibit croton oil induced ear edema in mice by 51%. DHEA at dose of 40 mg.kg-1 and 10 mg.kg-1 exhibited inhibitory effects on croton oil-induced ornithine decarboxylase (ODC) activity by 64% and 53%, respectively. These results revealed that DHEA can block the change of cell cycle and the percentage of S phase was decreased to 17% at concentration of 10(-7) mol.L-1. The increase of[Ca2+]i and pH as well as PKC-activation induced by TPA stimulation were significantly inhibited by DHEA pretreatment.
CONCLUSION: The present experiments demonstrate that DHEA appears to be an attractive candidate as an anti-tumorpromotion agent for tumor chemoprevention. The mechanism of its action might be related to its inhibitory effects on ODC activity and Ca(2+)-DG-PKC signal pathway.
METHODS: Using croton oil-induced ear edema model and applying confocal laser scanning microscopy, flow cytometry, immuno-fluorescent techniques to investigate the inhibitory effect of DHEA on tumor promotion.
RESULTS: DHEA 25 mg.kg-1 was shown to inhibit croton oil induced ear edema in mice by 51%. DHEA at dose of 40 mg.kg-1 and 10 mg.kg-1 exhibited inhibitory effects on croton oil-induced ornithine decarboxylase (ODC) activity by 64% and 53%, respectively. These results revealed that DHEA can block the change of cell cycle and the percentage of S phase was decreased to 17% at concentration of 10(-7) mol.L-1. The increase of[Ca2+]i and pH as well as PKC-activation induced by TPA stimulation were significantly inhibited by DHEA pretreatment.
CONCLUSION: The present experiments demonstrate that DHEA appears to be an attractive candidate as an anti-tumorpromotion agent for tumor chemoprevention. The mechanism of its action might be related to its inhibitory effects on ODC activity and Ca(2+)-DG-PKC signal pathway.