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Arch Biochem Biophys. 2015 Apr 15;572:36-39. doi: 10.1016/j.abb.2015.01.006. Epub 2015 Jan 17.

Lycopene in the prevention of renal cell cancer in the TSC2 mutant Eker rat model.

Author information

1
Department of Animal Nutrition, Veterinary Faculty, Firat University, Elazig, Turkey.
2
Winship Cancer Institute, Emory University, Atlanta, GA, United States.
3
Karmanos Cancer Institute, Wayne State University, Detroit, MI, United States.
4
DSM, Basel, Switzerland.
5
Molecular Carcinogenesis, Science Park - Research Division, The University of Texas MD Anderson Cancer Center, Smithville, TX, United States.
6
Winship Cancer Institute, Emory University, Atlanta, GA, United States. Electronic address: okucuk@emory.edu.

Abstract

Renal cell carcinoma (RCC) is the most frequent upper urinary tract cancer in humans and accounts for 80-85% of malignant renal tumors. Eker rat represents a unique animal model to study RCC since these rats develop spontaneous renal tumors and leiomyoma, which may be due to tuberous sclerosis 2 (TSC2) mutation resulting in the activation of the mammalian target of rapamycin (mTOR) pathway. This study examines the role of a lycopene-rich diet in the development of RCC in the TSC2 mutant Eker rat model. Ten-week old female Eker rats (n=90) were assigned in equal numbers to receive 0, 100 or 200mg/kg of lycopene as part of their daily diet. After 18 months the rats were sacrificed and the kidneys were removed. Immunohistochemical staining with antibodies against mTOR, phospho-S6 and EGFR were performed, as well as hematoxylin-eosin staining for histologic examination of the tumors. Tumors were counted and measured in individual kidneys. Presence of tumor decreased from 94% in control animals to 65% in the experimental group, but the difference was not statistically significant (P<0.12). However, mean numbers of renal carcinomas were statistically significantly decreased in the lycopene-treated rats (P<0.008) when compared to untreated controls. In the lycopene group, tumor numbers decreased (P<0.002) and the numbers tended to decrease linearly (P<0.003) as supplemental lycopene increased from 0 to 200. Control rats fed only basal diet had a greater length of tumors (23.98 mm) than rats fed lycopene supplement groups (12.90 mm and 11.07 mm) (P<0.05). Moreover tumor length decreased (P<0.02) and tumor length tended to decrease linearly (P<0.03) as supplemental lycopene increased from 0 to 200mg/kg. All tumors showed strong staining with antibodies against mTOR, phospho-S6 and EGFR. In conclusion, dietary supplementation with lycopene attenuates the development of renal cell cancers in the predisposed TSC2 mutant Eker rat model. These results suggest that lycopene may play a role in the prevention of RCC.

KEYWORDS:

Eker rat; Lycopene; Renal cell cancer

PMID:
25602702
PMCID:
PMC5657428
DOI:
10.1016/j.abb.2015.01.006
[Indexed for MEDLINE]
Free PMC Article

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