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Fetal Programming of Colon Cancer in Adult Rats: Correlations With Altered Neonatal Growth Trajectory, Circulating IGF-I and IGF Binding Proteins, and Testosterone

Fetal Programming of Colon Cancer in Adult Rats: Correlations With Altered Neonatal Growth Trajectory, Circulating IGF-I and IGF Binding Proteins, and Testosterone

Rijin Xiao, Leah J Hennings, Thomas M Badger, Frank A Simmen

J Endocrinol. 2007 Oct;195(1):79-87.

PMID: 17911399

Abstract:

We examined effects of dietary soy protein isolate (SPI) or genistein (GEN; soy isoflavone) during pregnancy on development of colon cancer in male progeny Sprague-Dawley rats. Four groups of rats were used: a lifetime casein-fed group (CAS; control diet), a lifetime SPI-fed group (positive control for protective effect of diet on colon carcinogenesis), a group whose dams received SPI only during pregnancy and CAS thereafter (SPI/CAS), and a group whose dams received CAS+GEN only during pregnancy and CAS thereafter (GEN/CAS). At 47 and 55 days of age, male progeny were administered the intestinal carcinogen azoxymethane (AOM). Tumors, endocrine status, and colon gene expression were evaluated at 20 week post-AOM. The SPI group had 47% decreased colon tumor incidence compared with the CAS group (P<0.05), whereas SPI/CAS, GEN/CAS, and CAS groups did not differ in this regard. Maternal-only SPI increased the percentage of animals bearing multiple colon tumors (P<0.05), an effect not mimicked by GEN. Serum insulin and leptin concentrations were decreased by lifetime SPI (P<0.05), whereas serum IGF-I was elevated in the SPI/CAS group (P<0.05). The SPI/CAS group had reduced serum testosterone levels (P<0.05) and exhibited a tendency for increased mucosal expression of IGF-I receptor and glucose transporter-1 mRNAs. Results indicate an effect of dietary protein type during pregnancy on colon tumor multiplicity and colon tissue gene expression, and serum IGF-I and testosterone in progeny rats as later adults.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP446720-A	Genistein, Soybean - CAS 446-72-0		446-72-0	Price

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