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Eicosapentaenoic acid (EPA) reduces crypt cell proliferation and increases apoptosis in normal colonic mucosa in subjects with a history of colorectal adenomas

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Abstract

Background and aims

Omega-3 fatty acids in fish oil exert a protective effect on the development of colorectal cancer in animal models. Patients with colorectal adenomas have been shown to have increased crypt cell proliferation and decreased apoptosis in macroscopically normal appearing colonic mucosa. We investigated whether dietary supplementation with eicosapentaenoic acid (EPA) could alter crypt cell proliferation and apoptosis in such patients.

Patients/methods

Thirty subjects were randomised to either 3 months of highly purified EPA in free fatty acid form (2 g/day) or to no treatment. Colonic biopsies were taken at the initial colonoscopy and repeated 3 months later, and analysed for cell proliferation and apoptosis (immunohistochemistry) and mucosal fatty acid content.

Results/findings

Crypt cell proliferation was significantly reduced whilst apoptosis was significantly increased after EPA supplementation. Neither crypt cell proliferation nor apoptosis were altered in the control group. EPA in the mucosa increased significantly after EPA supplementation, whereas there was no significant change in controls.

Conclusions

Dietary supplementation with EPA significantly increases levels of this fatty acid in colonic mucosa, associated with significantly reduced proliferation and increased mucosal apoptosis. Further studies are needed to assess the potential efficacy of EPA supplementation in preventing polyps in the chemoprevention of colorectal cancer.

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Abbreviations

EPA:

eicosapentaenoic acid

DHA:

docosahexaenoic acid

PUFAs:

polyunsaturated fatty acids

BMI:

body mass index

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Conflict of interest statement

EDC was funded by a research grant from SLA Pharma UK, and has been reimbursed by SLA Pharma UK for attending several conferences.

Author information

Correspondence to E. D. Courtney.

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Courtney, E.D., Matthews, S., Finlayson, C. et al. Eicosapentaenoic acid (EPA) reduces crypt cell proliferation and increases apoptosis in normal colonic mucosa in subjects with a history of colorectal adenomas. Int J Colorectal Dis 22, 765–776 (2007). https://doi.org/10.1007/s00384-006-0240-4

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Keywords

  • Apoptosis
  • Anoikis
  • Cell proliferation
  • Eicosapentaenoic acid
  • Colorectal neoplasms