Abstract

This study determined the therapeutic effect of ethanol leaf extract of Combretum zenkeri on kidney function of rats exposed to benzo[a]pyrene. Male Wistar albino rats were  treated with ethanol leaf extract of C. zenkeri (400 mg/kg) in the presence or absence of BaP (200 mg/kg) for four weeks. The blood obtained at the end of the treatment was processed into serum and used for biochemical analyses and kidney tissues for histology. The serum creatinine, urea, sodium ion and potassium ion concentrations of the group exposed to benzo[a]pyrene without treatment with C. zenkeri extracts were significantly higher (p<0.05) as compared to the normal control group. The kidney histology indicated severely damaged glomeruli. The groups treated with the leaf extract pre- or post- benzo[a]pyrene exposure showed significant reduction (p<0.05) in serum concentration of urea, creatinine and sodium ion, while the pre-treated group showed no significant reduction (p<0.05) in serum potassium ion concentration. The biochemical and histological studies indicated that, C. zenkeri can ameliorate benzo[a]pyrene induced oxidative kidney damage.

Key words: Combretum zenkeri, benzo[a]pyrene, PAHs, oxidative damage, kidney functions.