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Wong et al., Pathology 2001
(Breast Neoplasms) :
The aim of this study was to assess the
effects of transforming growth factor-beta1 ( TGFbeta1 ),
insulin-like growth factor-I (IGF-I) and insulin-like growth factor-II (IGF-II) on cell growth,
E1STS and E2DH activities in the MCF-7 and MDA-MB-231 human breast cancer cell lines
Nestler et al., Horm Metab Res 1989
:
A possible mechanism for this phenomenon would be an
insulin mediated increase in
steroid sulfatase activity, with insulin acting either via activation of the insulin receptor or via cross-reaction with the insulin-like growth factor I (IGF-I) receptor ... These data indicate that neither
insulin nor IGF-I
affect the
steroid sulfatase activity of human cytotrophoblasts ... An
effect of
insulin or IGF-I on the
steroid-sulfatase activity of other tissues has not been excluded ... These observations suggest that the decline in serum DHEA-S levels during hyperinsulinemia is not mediated via an
insulin induced increase in
steroid sulfatase activity