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Modulation of Angiogenesis, Proliferative Response and Apoptosis by β-Sitosterol in Rat Model of Renal Carcinogenesis
Ramalingam Sharmila1, Ganapathy Sindhu1
1Department of Biochemistry and Biotechnology, Annamalai University, Annamalainagar, Chidambaram, Tamilnadu 608002 India.
Abstract:
As expanded understanding of molecular tumor characteristics, which drive renal cancer growth and progression gives a promising future for renal carcinoma therapy. The objective of the present study was designed to examine the effect of β-sitosterol on a rat model of experimental renal carcinogenesis. Renal carcinogenesis was induced in rats treated with N-diethylnitrosamine (DEN; 200 mg/kg bw single i.p., injection) and ferric nitrilotriacetate (Fe-NTA; 9 mg Fe/kg bw i.p., twice a week for 16 weeks). β-sitosterol pretreatment (20 mg/kg bw in 0.1 % carboxymethyl cellulose (CMC) p.o., thrice a week for 24 weeks) was started 2 weeks before the exposure to carcinogens. Expression of angiogenesis marker (VEGF), proliferative markers (cyclin D1, PCNA) and apoptotic markers (Bcl-2, Bax, caspase-3 and caspase-9) were analyzed to assess the anti-cancer potential of β-sitosterol in renal carcinogenesis model. mRNA and protein expression changes were determined by qRT-PCR, Western blotting, ELISA technique and immunohistochemistry. Our results showed that oral administration of β-sitosterol pretreatment significantly (P < 0.05) reversed the expression of all the above mentioned markers and histological features which have been modified by renal carcinogen. It is concluded that, the protective effects of β-sitosterol against renal cancer is associated with the induction of apoptosis and the inhibition of cellular proliferation.
Insights
Beta-sitosterol shows promise in preventing renal cancer by inhibiting cell proliferation and promoting apoptosis. This study demonstrates its protective effects against chemically induced kidney cancer in rats.
Area of Science:
- Oncology
- Molecular Biology
- Pharmacology
Background:
- Understanding molecular drivers of renal cancer is crucial for developing effective therapies.
- Beta-sitosterol, a plant sterol, has demonstrated potential anti-cancer properties.
- Experimental models are vital for evaluating therapeutic interventions in renal carcinogenesis.
Purpose of the Study:
- To investigate the anti-cancer effects of beta-sitosterol in a rat model of experimental renal carcinogenesis.
- To assess the impact of beta-sitosterol on key molecular markers of cancer progression, including angiogenesis, proliferation, and apoptosis.
- To determine the therapeutic potential of beta-sitosterol in preventing or mitigating kidney cancer development.
Main Methods:
- Renal carcinogenesis was induced in rats using N-diethylnitrosamine (DEN) and ferric nitrilotriacetate (Fe-NTA).
- Beta-sitosterol was administered orally as a pretreatment before carcinogen exposure.
- Expression levels of VEGF, cyclin D1, PCNA, Bcl-2, Bax, caspase-3, and caspase-9 were analyzed using qRT-PCR, Western blotting, ELISA, and immunohistochemistry.
Main Results:
- Beta-sitosterol pretreatment significantly reversed the expression of angiogenesis and proliferative markers (VEGF, cyclin D1, PCNA).
- The compound also modulated apoptotic markers (Bcl-2, Bax, caspase-3, caspase-9), indicating induction of programmed cell death.
- Histological features altered by renal carcinogens were significantly improved by beta-sitosterol treatment.
Conclusions:
- Beta-sitosterol exhibits significant protective effects against chemically induced renal cancer in rats.
- These protective effects are attributed to the induction of apoptosis and inhibition of cellular proliferation.
- Beta-sitosterol represents a potential therapeutic agent for renal carcinoma, warranting further investigation.
