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. 2000 Jul 24;83(4):550–558. doi: 10.1054/bjoc.2000.1324

Oestrogen inactivation in the colon: analysis of the expression and regulation of 17 β -hydroxysteroidehydrogenase isozymes in normal colon and colonic cancer

M A English 1,1, S V Hughes 1, K F Kane 1, M J S Langman 1, P M Stewart 1,2, M Hewison 1
PMCID: PMC2374654  PMID: 10945506

Abstract

Epidemiological data suggest that oestrogen contributes to the aetiology of colonic cancer. Furthermore, recent studies have suggested that local hormone metabolism may play a key role in determining colonic responsiveness to oestrogen. To further clarify this mechanism we have characterized the expression and regulation of isozymes of 17β-hydroxysteroid dehydrogenase (17β-HSD) in vitro and in situ. Immunohistochemistry was used to confirm expression of the type 2 and 4 isozymes of 17β-HSD (17β-HSD2 and 4) in normal colonic epithelial cells. Parallel studies suggested that both isozymes were abnormally expressed in colonic tumours and this was confirmed by Western blot analyses. Abnormal expression of 17β-HSD2 and 4 proteins was also observed in Caco-2, HT-29 and SW620 colonic cancer cell lines, although the overall pattern of oestrogen metabolism in these cells was similar to that seen in primary colonic mucosal tissue. The predominant activity (conversion of oestradiol to oestrone) was highest in Caco-2>SW620>HT-29, which correlated inversely with the rate of proliferation of the cell lines. Regulatory studies using SW620 cells indicated that the most potent stimulator of oestradiol to oestrone inactivation was the antiproliferative agent 1,25-dihydroxyvitamin D 3(1,25D 3), whilst oestradiol itself inhibited 17β-HSD activity. Both oestradiol and 1,25D 3 decreased mRNA for 17β-HSD2 and 4. Data indicate that the high capacity for inactivation of oestrogens in the colon is associated with the presence of 17β-HSD2 and 4 in epithelial cells. Abnormal expression of both isozymes in colonic cancer cells and the stimulation of oestrogen inactivation by the antiproliferative agent 1,25D 3 highlights a possible role for 17β-HSD isozymes as modulators of colonic cell proliferation. © 2000 Cancer Research Campaign

Keywords: colonic cancer; 17β-hydroxysteroid dehydrogenase; 1,25-dihydroxyvitamin D 3; oestradiol; oestrone

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Selected References

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