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Evaluation of ovariectomy and dehydroepiandrosterone sulfate administration on interleukin-6 levels and B16 melanoma growth in mice

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Abstract

Interleukin-6 (IL-6) can inhibit growth of a variety of tumors including B16 routine melanoma. IL-6 levels increase with age and after ovariectomy or menopause. The adrenal androgen, dehydroepiandrosterone sulfate (DHEAS), can lower serum IL-6 levels in aged mice. Therefore, we hypothesized that ovariectomy would induce elevations of serum IL-6 capable of inhibiting B16 melanoma growth in mice. Additionally we postulated that DHEAS would be able to reverse the ovariectomy-induced increase in IL-6, thus abrogating IL-6’s antitumor effect.

To explore our hypothesis ovariectomy or sham surgery was performed on C57BL/6 mice followed by inoculation with B16 melanoma. The mice then received either oral DHEAS or placebo. Ovariectomy resulted in significant weight gain without altered food intake. IL-6 levels were elevated comparably in all groups after ovariectomy or sham surgery. Administration of DHEAS had no effect on these parameters. Tumor size was not significantly different between test groups, however the ovariectomized mice receiving DHEAS had a trend towards larger tumor volume compared to the other test groups. Additionally, splenocytes from ovariectomized mice receiving DHEAS demonstrated enhanced tumor cell killing in vitro. We conclude that ovariectomy does not elevate serum IL-6 to a level which results in inhibition of B16 tumor cell growth and may in fact enhance tumor growth in conjunction with DHEAS.

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Keller, E.T., Pugh, T.D., Sun, W.H. et al. Evaluation of ovariectomy and dehydroepiandrosterone sulfate administration on interleukin-6 levels and B16 melanoma growth in mice. AGE 19, 75–81 (1996). https://doi.org/10.1007/BF02434086

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