Sperm abnormality and infertility in male mice treated with the recommended dose of dimethoate and its double.

Background: Dimethoate (DM) is one of the most important organophosphate insecticides used for controlling many pests which affect vegetables, fruits, and agricultural crops, its persistence in soils and crops could cause a health hazard to humans as well as other non-target organisms. Aim: This study was conducted to evaluate the effect of the recommended dose and its double of DM on sex hormones, sperm morphology, and fertility of adult male mice. Methods: Twenty-seven Swiss albino adult male mice were divided into three groups of nine animals each: control group received distilled water only, while other groups received DM orally at doses (0.1 and 0.2 ml DM/100 ml distilled water) for 20 days, at the end of the treatment, six mice from each group were sacrificed. The sperm morphology was evaluated and sex hormones were measured. Three mice from each group were allowed to mate with untreated females (1:2). Result: The results revealed a decrease in luteinizing hormone levels in mice treated with (0.2 ml DM/100 ml distilled water) compared with the control group while the levels of follicle-stimulating hormone and testosterone did not record any significant differences. Also, the results demonstrated a significant increase in abnormal sperm morphology such as head and tail. The fertility was reduced and the average number of dead embryos increased while the average number of live embryos decreased. Conclusion: This current study confirmed that DM has detrimental effects on sperm morphology, fertility, and the embryos; therefore, more efforts should be exerted to protect ourselves and our environment from the harmful effects of this pesticide.

Positive effect of green tea extract on reproductive toxicity induced by dimethoate in male mice.

Background: Dimethoate (DM) is one of the most organophosphorus pesticides used all over the world to control insect pests, the extensive use of this insecticide causes a health hazard to animals and humans. Aim: This study was conducted to evaluate the positive effect of green tea extract on sperm quality and testicular cytoarchitecture in male mice treated with DM and on its reproductive performance. Methods: Mice were divided into three groups, each group contained nine mice, the first group (control) was given distilled water only, the second group received DM at a dose (0.1 ml DM/100 ml distilled water) while the third group was given DM at a dose (0.1 ml DM/ 100 ml distilled water) and the green tea extract at a dose (100 mg/kg). After 20 days of the treatment, six mice from each group were killed, sperm quality (sperm count, morphology motility) and histopathological lesions of testis were evaluated. Results: The results showed that DM significantly affected sperm quality a decrease in sperm motility and an increase in abnormal sperm morphology and caused marked alterations in the microstructures of testicular tissues. When treated males were mated with untreated females, a decline in the number of live embryos was found, while the green tea extract revealed an effective role by reducing those negative influences. Conclusion: This study revealed that DM has detrimental effects on sperm quality, testicular tissues, and the embryos, while treatment with green tea revealed a positive role in improving those negative influences of DM without causing any harmful side effects.

Selective adenosine A2A receptor inhibitor SCH58261 reduces oligodendrocyte loss upon brain injury in young rats.

Cellular elements of maturing brain are vulnerable to insults, which lead to neurodevelopmental defects. There are no established treatments at present. Here we examined the efficacy of selective adenosine A2A receptor inhibitor SCH58261 to combat brain injury, particularly oligodendrocyte (OL) lineage cells, in young rats. Wistar rats (n = 24, 6.5 days old) were randomly divided into equal groups of four. The sham (SHAM) group received no treatment, the vehicle (VEHICLE) group received 0.1% dimethylsufoxide, the injury (INJ) group was exposed to oxygen-glucose deprivation insult, and the injury+SCH58261 (INJ+SCH58261) group was exposed to the insult and received 1 µM SCH58261. Immunocytochemical experiments revealed that there was a significant reduction in the populations of mature OL (MBP+ OLs) and immature OL precursors (NG2+ OPCs) in the INJ group compared to SHAM group. Furthermore, there was also a significant increase in the percent of apoptotic MBP+ OL and NG2+ OPC populations as evidenced by TUNEL assay. In addition, there was a significant reduction in the proliferation rate among NG2+ OPCs, which was confirmed by BrdU immunostaining. On the other hand, treatment with SCH58261 significantly enhanced survival, evidenced by the reduction in apoptotic indices for both cell types, and it is preserved the NG2+ OPC proliferation. Activation of adenosine A2A receptors may contribute to OL lineage cell loss in association with decreased mitotic behavior of OPCs in neonatal brains upon injury. Future investigations assessing ability of SCH58261 to regenerate myelin will provide insights into its wider clinical relevance.

A novel polymorphic triplet repeat in intron five of the alpha-synuclein gene: no evidence of expansion or allelic association with idiopathic Parkinson's disease in the Irish.

The recent discovery of two mutations associated with autosomal dominant Parkinson's disease (PD) has led to the hypothesis that the alpha-synuclein gene plays a role in the pathogenesis of PD. Here we report a novel triplet CAA repeat within the unusually large intron 5 sequence of the alpha-synuclein gene. Microsatellite analysis revealed a high degree of polymorphism within the Irish population with seven alleles detected, ranging from eight to 17 CAA repeats. Analysis of the allele/genotype frequency differences observed between an Irish idiopathic PD cohort (eta = 98) and a healthy aged control group ( eta= 92) revealed no strong association with either group. All PD subjects displaying homozygous profiles were examined for expansion of the trinucleotide repeat, but no expansion was observed. These results would suggest that polymorphism of the alpha-synuclein gene may not play as significant a role in the pathogenesis of idiopathic PD as previously hypothesised.