Objective: The aim of the study was to investigate the prosexual activity of two compounds isolated from the hexane extract of the dried roots of Mondia whitei in rats. Methods: β-sitosterol and the mixture of α and β-amyrin acetate were isolated and characterised using several reagents, chromatography, mass spectrometry and physical analysis (RMN, 1H and 13C). Sexually inexperienced adult male rats were orally treated with these compounds at doses of 0mg/kg (control), 10mg/kg or 50mg/kg. 1h after the treatment, mount and intromission latencies and frequencies, penile erection, ejaculation latency and post-ejaculatory interval were measured for 60 minutes. Results: β-sitosterol and the mixture of α and β-amyrin acetate significantly increased the mount frequency (p<0.05), penile erection (P<0.001) and the ejaculation latency when compared to control. The intromission frequency remained unchanged (P>0.05) when compared to control. The two purified compounds were efficient at the lower dose (10 mg/kg b.w) with β-sitosterol being the most potent. Conclusion:Results of the present work give added value to the aphrodisiac property of Mondia whitei and further justify its popular use as a sex stimulant.

AIMTo determine the androgenic effects of Basella alba and Hibiscus macranthus extracts in the rat and the bull, and to develop a novel in vitro test system using Leydig cells from bull testes.

METHODSThe effect of methanol extracts from both plants on testosterone production in isolated Leydig cells from the rat and the bull was analyzed using 125I-radioimmunoassay (125I-RIA). Rat Leydig cells were obtained by common methods, whereas a novel technique was used to purify Leydig cells from bull testes.

RESULTSBull testes from the slaughter house were a cheap source of pure Leydig cells. In culture, these cells produced testosterone for 5-6 days, which can be stimulated by human chorionic gonadotrophin (hCG). Basella alba extracts significantly enhanced testosterone production in bull and rat Leydig cells in a concentration-dependent manner. Hibiscus macranthus showed no androgenic effect but was shown to inhibit testosterone production at higher concentrations.

CONCLUSIONLeydig cells purified from bull testes can be used as an alternative tool in experimental animal research. Certain fractions of Basella alba extract demonstrated androgenic potential whereas Hibiscus macranthus extracts did not.

Animals ; Cattle ; Cells, Cultured ; Hibiscus ; Iodine Radioisotopes ; Leydig Cells ; cytology ; drug effects ; metabolism ; Male ; Methanol ; Plant Extracts ; pharmacology ; Plants, Edible ; Rats ; Rats, Sprague-Dawley ; Solvents ; Testosterone ; biosynthesis

AIMTo find an in vitro system for the measurement of the androgenic effects of different extracts of Hibiscus macranthus (Malvaceae) and Basella alba (Basellaceae).

METHODSThe production of testosterone from testes slices incubated in two media, either Krebs-Henseleit buffer containing 0.5% Bovine serum albumin (BSA) or Dubecco's Modified Eagle's medium-F12 Ham nutrient mixture (DME/Ham F12), under a mixture of 5% CO2 in 95% air was determined either in the presence or absence of cofactors and Hibiscus macranthus plus Basella alba (HMBA) extracts.

RESULTSThe testosterone production was increased in testes slices incubated in DME/Ham F12 medium in response to the cofactors (49%) and aqueous extracts (34%-60% according to dilutions). Under the same atmospheric conditions, there was no positive response of the testes slices to either cofactor or HMBA extract stimulation in Krebs-Henseleit buffer containing 0.5% BSA. In further investigations related to the effect of HMBA, the DME/Ham F12 medium was used. The results obtained from the in vitro test showed that the activity was present mainly in methylene chloride and methanol, since these extracts induced an increase in testosterone production by testes slices.

CONCLUSIONThe testes slice system is suitable to be used for further in vitro investigations of the isolation of androgenic bioactive components of plants.

Animals ; Hibiscus ; chemistry ; In Vitro Techniques ; Magnoliopsida ; chemistry ; Male ; Plant Extracts ; pharmacology ; Rats ; Rats, Wistar ; Testis ; drug effects ; metabolism ; Testosterone ; biosynthesis