Modulation of penile erection in rabbits by mondia whitei: possible mechanism of action

Abstract

Mondia whitei root was evaluated to validate its anecdotal use and determine its possible mode of action in the management of erectile dysfunction. Rabbits were administered with daily oral doses of 100-400 mg kg -1 crude ethanolic extract of M. whitei and sildenafil (50 mg kg -1 ) as positive control for 6 weeks. Cavernosal tissue NOS activity and levels of NO and cGMP, and NOS and PDE protein expressions were investigated. The effect of the crude extract, chloroform and petroleum ether fractions in vitro on cavernosal tissue NOS activity and levels of NO and cGMP at 0.01 and 0.10 mg g -1 tissue were also investigated. Results indicate that the crude extract increased NOS activity by 7% at 200 mg kg -1 with corresponding increases in NO (88%) and cGMP (480%) levels. No significant changes in these measurements were observed with the 100 and 400 mg kg -1 doses whilst sildenafil slightly reduced them (15.9-37.5%). NOS and PDE protein expressions in test animals were not different from controls. Pre-incubation of cavernosal tissue in vitro with the crude extract of M. whitei and its chloroform fraction markedly increased NOS activity (26-132%) and levels of NO (25%) and cGMP (50-400%) at 0.01 mg g -1 tissue but these were reduced to near control levels when their concentrations were increased to 0.10 mg g -1 tissue whilst the petroleum ether fraction had no effect. These findings suggest that M. whitei may influence erectile function through activation/stimulation of NOS with corresponding increases in tissue NO and cGMP levels and that certain chemical constituents present in the chloroform fraction may be responsible for biological activity.

Effects of aqueous root extract of Carpolobia alba G. Don on sexual behaviour in adult male rats

“…This increased vasorelaxation resulted in an increase in the number of erections (NE) in the erectile bodies of the penis and, consequently, an increase in the erection index observed during our studies. Such a mechanism was also described by Quasie, Martey, Nyarko, Gbewonyoand, and Okine () in rabbits with M. whitei extract which stimulated NO synthetase activity.…”

The use of plants in the traditional management of diabetes in Nigeria: Pharmacological and toxicological considerations

“…A good example is the use of the aphrodisiac plant Mondia whiteii (Hook. f.) Skeels (Quasie et al, 2010). Despite not showing in vitro hypoglycemic effect (Etoundi et al, 2010), it is commonly included in multi-component preparations for diabetes management in men since erectile dysfunction is a common complication of the illness (personal communication during field work).…”

A Comparative Study on the Aphrodisiac Activity of Food Plants Mondia Whitei, Chenopodium Album, Cucurbita Pepo and Sclerocarya Birrea Extracts in Male Wistar Rats.

“…Prosexual effects were evident throughout the study, including after a single dose. Erectile effects of M. whitei on corpus cavernosal tissue have been demonstrated and attributed to an increase in NO (Quasie et al, 2010;Watcho et al, 2007b). Effects of M. whitei in increasing sperm motility and testosterone levels (Watcho et al, 2007a;Lampiao et al, 2008;Gundidza et al, 2009).…”