Reference SummarySong J, Cancer Res 2000 Oct 1;60(19):5434-40

Title

Effects of dietary folate on intestinal tumorigenesis in the apcMin mouse

Authors

Song J; Medline A; Mason JB; Gallinger S; Kim YI

Journal

Cancer Res

Volume

60

Issue

19

Year

2000

Pages

5434-40

Abstract

Dietary folate appears to be inversely related to colorectal cancer risk. This study investigated the effects of dietary intervention with folate or the development of intestinal polyps in Min (Apc +/-) mice. Weanling Mil mice were fed diets containing 0, 2 (basal requirement), 8, or 20 mg folate/kg diet. At 3 and 6 months of dietary intervention, 50% of the mice from each group were sacrificed, and the small intestine and colon were analyzed for polyps and aberrant crypt foci (ACF). Serum folate concentrations accurately reflected dietary folate levels (P < 0.001). At 3 months no significant difference in the average number of total small intestinal polyps was observed among the four groups. However, increasing dietary folate levels significantly reduced the number of ileal, but not duodenal or jejunal, polyps in a dose-dependent manner (P-trend = 0.001); folate supplementation at 20 mg/kg diet was associated with a 68-78% reduction in the number of ileal polyps compared with the other three diets (P < 0.007). The number of ileal polyps was inversely correlated with serum folate concentrations (P = 0.03). At 3 months, increasing dietary folate levels significantly decreased the number of colonic ACF in a dose-dependent manner (P = 0.05); the control and two folate supplemented diets significantly reduced the number of colonic ACF by 75 100% compared with the folate-deficient diet (P < 0.04). The number of colonic ACF was inversely correlated with serum folate concentration (P = 0.05). No significant difference in the number of colonic adenoma was observed among the four groups at 3 months. At 6 months, no significant differences in the average number of total small intestinal, duodenal, and jejunal polyps, colonic adenomas, and colonic ACF wer observed among the four groups. However, the folate-deficient diet had 62-76% lower number of ileal polyps compared with the control and two folate-supplemented diets (P < 0.003). Serum folate concentrations, but not dietary folate levels, were directly correlated with the number of ilea polyps (P = 0.006). These data suggest that dietary folate supplementation suppresses the development of ileal polyps and colonic ACF in this model However, at later time points, folate supplementation appears to have an opposite effect on ileal polyps. These data generally support the role of folate in intestinal tumorigenesis suggested in epidemiological studies and chemical carcinogen animal models. Notwithstanding the limitations associated with this model, these data suggest that the optimal timing and dose of folate intervention need to be determined for safe and effective folate chemoprevention.

Links

J:65027 – Mouse Genome Informatics
11034085 – National Library of Medicine/PubMed

Models

Strain Model Name Treatment Agent(s) Organ Affected Frequency Model Details
C57BL/6J-ApcMin/+ Intestine - Large Intestine - Colon adenoma
  • folate-deficient
Intestine - Large Intestine - Colon

observed

C57BL/6J-ApcMin/+ Intestine - Large Intestine - Colon adenoma Intestine - Large Intestine - Colon

observed

C57BL/6J-ApcMin/+ Intestine - Large Intestine - Colon adenoma
  • folate-supplemented
Intestine - Large Intestine - Colon

observed

C57BL/6J-ApcMin/+ Intestine - Large Intestine - Colon foci - aberrant crypt (ACF)
  • folate-deficient
Intestine - Large Intestine - Colon

observed

C57BL/6J-ApcMin/+ Intestine - Large Intestine - Colon foci - aberrant crypt (ACF) Intestine - Large Intestine - Colon

observed

C57BL/6J-ApcMin/+ Intestine - Large Intestine - Colon foci - aberrant crypt (ACF)
  • folate-supplemented
Intestine - Large Intestine - Colon

observed

C57BL/6J-ApcMin/+ Intestine - Small Intestine - Duodenum adenoma
  • folate-deficient
Intestine - Small Intestine - Duodenum

observed

C57BL/6J-ApcMin/+ Intestine - Small Intestine - Duodenum adenoma Intestine - Small Intestine - Duodenum

observed

C57BL/6J-ApcMin/+ Intestine - Small Intestine - Duodenum adenoma
  • folate-supplemented
Intestine - Small Intestine - Duodenum

observed

C57BL/6J-ApcMin/+ Intestine - Small Intestine - Ileum adenoma
  • folate-deficient
Intestine - Small Intestine - Ileum

observed

C57BL/6J-ApcMin/+ Intestine - Small Intestine - Ileum adenoma Intestine - Small Intestine - Ileum

observed

C57BL/6J-ApcMin/+ Intestine - Small Intestine - Ileum adenoma
  • folate-supplemented
Intestine - Small Intestine - Ileum

observed

C57BL/6J-ApcMin/+ Intestine - Small Intestine - Jejunum adenoma
  • folate-deficient
Intestine - Small Intestine - Jejunum

observed

C57BL/6J-ApcMin/+ Intestine - Small Intestine - Jejunum adenoma Intestine - Small Intestine - Jejunum

observed

C57BL/6J-ApcMin/+ Intestine - Small Intestine - Jejunum adenoma
  • folate-supplemented
Intestine - Small Intestine - Jejunum

observed

C57BL/6J-ApcMin/+ Intestine - Small Intestine adenoma
  • folate-deficient
Intestine - Small Intestine

observed

C57BL/6J-ApcMin/+ Intestine - Small Intestine adenoma Intestine - Small Intestine

observed

C57BL/6J-ApcMin/+ Intestine - Small Intestine adenoma
  • folate-supplemented
Intestine - Small Intestine

observed