Impaired expression of neuronal nitric oxide synthase in the gracile nucleus is involved in neuropathic changes in Zucker Diabetic Fatty rats with and without 2,5-hexanedione intoxication.

These studies examined the influence of 2,5-hexanedione (2,5-HD) intoxication on expression of neuronal nitric oxide synthase (nNOS) in the brainstem nuclei in Zucker Diabetic Fatty (ZDF) vs. lean control (LC) rats. Functional neuropathic changes were also investigated following axonal damage and impaired axonal transport induced by the treatment. Animals were intoxicated by i.p. injection of 2,5-HD plus unilateral administration of 2,5-HD over the sciatic nerve. The mechanical thresholds and withdrawal latencies to heat and cold stimuli on the foot were measured at baseline and after intoxication. The medulla sections were examined by nNOS immunohistochemistry and NADPH-diaphorase histochemistry at the end of the treatments. The mechanical thresholds and withdrawal latencies were significantly decreased while nNOS immunostained neurons and NADPH-diaphorase positive cells were selectively reduced in the gracile nucleus at baseline in ZDF vs. LC rats. NADPH-diaphorase reactivity and nNOS positive neurons were increased in the ipsilateral gracile nucleus in LC rats following 2,5-HD intoxication, but its up-regulation was attenuated in ZDF rats. These results suggest that diabetic and chemical intoxication-induced nNOS expression is selectively reduced in the gracile nucleus in ZDF rats. Impaired axonal damage-induced nNOS expression in the gracile nucleus is involved in neuropathic pathophysiology in type II diabetic rats.

Determinants of HIV/AIDS risk behaviors in expectant fathers in Haiti.

Haiti has an HIV/AIDS epidemic of the highest magnitude outside of sub-Saharan Africa. Factors such as relationship power imbalances, traditional gender role acceptance, and patriarchal belief systems that devalue women's sexuality have increased Haitian women's vulnerability to HIV infection. Because of these influences and since the HIV epidemic is largely heterosexually transmitted, it is important to understand the role that men's beliefs and behaviors play in the continuing risk of young men and women in Haiti. The purpose of this study was to gather information from male community members through semi-structured interviews in order to describe the prevalence of HIV/AIDS risk behaviors (e.g., condom use, number of sexual partners) among expectant fathers in Haiti and identify predictive psychosocial variables of HIV/AIDS risk behaviors. Results from this study showed that men who were not married (OR = 0.22, p = 0.05) and men who had medium (OR = 22.50, p < 0.001) and high sexual communication (OR = 36.51, p < 0.001) were more likely to use condoms. This study also showed that high stigma associated with HIV (OR = 16.07, p < 0.05), low HIV knowledge (OR = 0.10, p < 0.01), and high decision making power (OR = 62.52, p < 0.001) were predictors of multiple sex partners for the expectant fathers in the sample. HIV prevention programs should be designed to increase knowledge about HIV transmission, treatment, prevention and personal risk of contraction as well as correct misconceptions about individuals with HIV or AIDS and promote sex communication among partners.