Grasas y Aceites, Vol 62, No 3 (2011)

Dietary fish oil modulates the effect of dimethylhydrazine- induced colon cancer in rats


https://doi.org/10.3989/gya.091210

G. E. Rasmy
Biochemistry Department, National Research Centre, Egypt

W. K.B. Khalil
Cell Biology Department, National Research Center, Egypt

S. A. Moharib
Biochemistry Department, National Research Centre, Egypt

A. A. Kawkab
Department of pathology- Faculty of Vet. Med. Cairo Univ., Egypt

E. W. Jwanny
Biochemistry Department, National Research Centre, Egypt

Abstract


This study was conducted to examine the efficacy of fish oil supplementation in male wistar rat colon carcinogenesis. In order to induce colon cancer, the rats were given a weekly subcutaneous injection of 1,2-Dimethylhydrazine (DMH) at a dose of 20 mg/kg b.w. for five weeks. Afterwards, some of the rats ingested fish oil for either 4 weeks (DMH-FO4 group), or 17 weeks (DMH-FO17 group). The remaining rats continued without any supplementation for the same 4 weeks (DMH4 group), or 17 weeks (DMH17 group). Another two groups of rats did not receive the DMH and were given fish oil (FO17 group) or a normal diet only and considered as the control group (CN group). At the end of the experiment, the rats were sacrificed; and were subsequently subjected to biochemical and molecular biological analyses as well as histopathological examinations. The results showed increased levels of lactate dehydrogenase (LDH), malondialdehyde (MDA) and alkaline phoshatase (ALP) activities in the DMH rats compared to the control. The liver and colonic changes that were induced by DMH were significantly improved through fish oil supplementation in the DMH-FO17 group. The molecular analysis revealed that DMH treatment induced the expression alterations of genes p53, p27 and p21 and increased DNA band patterns related to cancer, while both FO17 and DMH-FO17 groups showed much better results. A histopathological examination of the DMH17 group revealed colon adenocarcinoma and several lesions in rat liver tissues. An improvement in the histopathological picture was seen in the livers and colons of groups DMHFO17. In conclusion, the present results demonstrated the anti-carciongenic effect of herring fish oil against DMH induced colon carcinogenesis in rats. The inhibitory effect of FO was due to the modulation of elevated biochemical parameters, DNA damage, gene expression and histopathological lesions caused by DMH.

Keywords


Colorectal cancer; DMH; Fish oil; Gene expression; Rats

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References


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