ABSTRACT
Cypermethrin (CYP) is one of the most common active ingredients in most insecticides, mosquito coils and powder used in Nigeria. dichlorvos (DDVP) is the most indiscriminately used fumigant in most rural and sub-urban areas in Nigeria. These fumigants can easily be accessed without proper method of usage thus exposing the population to their toxic effects. As a result, this study was initiated to determine the effects of sub-acute exposure of CYP and DDVP on some biochemical and histopathological parameters of albino rats. In this study, forty (40) albino rats of 10 groups of 4 rats per group, with one group serving as control, were exposed to these fumigants in a poorly ventilated area for 4hours per day over 2, 4 and 6 weeks. The results showed observable changes in liver enzyme activities (p<0.05) in groups exposed to DDVP for 2, 4 and 6 weeks. The groups exposed to CYP showed mild changes in liver enzyme activities when compared with the DDVP groups. Increase in activity of the liver enzymes was also observed in the groups exposed to a mixture of DDVP+CYP for 2, 4 and 6 weeks. The urea, creatinine and electrolytes levels in all the groups exposed to DDVP, CYP and DDVP+CYP for 2, 4 and 6weeks were significantly (p<0.05) increased. Also WBC and platelets in all the groups exposed to DDVP and CYP recorded significant changes. The histology report of the lungs and liver showed moderate lymphocytic infiltration and hepatocytic steatosis which progressed with duration of exposure to the fumigants, while the kidneys showed no remarkable changes. The results of this study suggest that DDVP and CYP have relative toxic effects in the exposed animals and should be used with caution to avoid human exposure to their visible toxicities.
ABSTRACT
OBJECTIVE: Literature has confirmed the pathogenic role of cadmium (Cd) and its exposure in the induction of dyslipidemia implicated in the development and increasing incidence of cardiovascular diseases. The current study explored whether polyphenolics isolated from virgin coconut oil (VCO) prevent Cd-induced dyslipidemia and investigate the underlying mechanism of action, in rats. MATERIALS AND METHODS: Rats were pretreated with VCO polyphenols (10, 20 and 50 mg/kg body weight; orally) 2 weeks prior to concurrent Cd administration (5 mg/kg) for 5 weeks. Subsequently, serum concentrations of lipid and lipoprotein cholesterol and cardiovascular risk ratios were determined. Hepatic activities of superoxide dismutase (SOD) and catalase (CAT) as well as reduced glutathione (GSH) and malondialdehyde (MDA) contents were analyzed. RESULTS: Sub-chronic Cd administration significantly increased the serum levels of total cholesterol, triglycerides, low density lipoprotein cholesterol and very low density lipoprotein cholesterol while markedly reduced high density lipoprotein cholesterol. Hepatic activities of SOD and CAT as well as GSH content were suppressed by Cd, whereas MDA level was obviously increased. The co-administration of VCO polyphenol with Cd remarkably restored lipid profile and cardiovascular risk ratios and stabilized antioxidant defense systems comparable to control group. CONCLUSION: This is the first study presenting that polyphenols isolated from VCO prevent Cd-induced lipid abnormalities and cardiovascular risk ratios by improving antioxidant defense systems.
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INTRODUCTION: Trypanosomes are protozoan parasites of vertebrates transmitted by blood-sucking tsetse fly. Trypanosomes remain a constant threat to the lives of humans and animals throughout large regions of Africa. AIMS AND OBJECTIVES: This study investigated the presence, prevalence, and species of trypanosome parasite in tsetse flies caught in two areas of no previous documented history of trypanosome infection. MATERIALS AND METHODS: For this purpose, 63 and 77 nonterenal tsetse flies were collected from Oji River and Emene areas of Enugu State Nigeria, respectively. Genomic DNA was isolated from the whole tsetse fly using genomic DNA extraction kit. Identification and characterization of trypanosome were done using two approaches: the amplification of internal transcribed spacer 1 of ribosomal DNA and the use of primers specific to Trypanozoon. RESULTS: In Oji River, of 63 tsetse flies collected, the identification of trypanosome parasite was done on 57 flies and 6 (10.71%) tsetse flies were infected with trypanosome parasite. Six flies were infected with Trypanosoma Congolense, 2 with Trypanosoma Vivax, and 1 with Trypanosoma brucei. Two mixed infections of T. vivax and T. congolense and 1 mixed infection of T. brucei and T. congolense was also identified. In Emene, of 77 tsetse flies collected, the identification of trypanosome parasite was done on 66 flies and 11 (16.6%) tsetse flies were infected with trypanosome parasite. Nine flies were infected with T. congolense, 2 with T. vivax, and 3 with T. brucei. Mixed infections identified include 2 mixed infections of T. brucei and T. congolense and 1 mixed infections of T. vivax and T. brucei. None of the subspecies of T. brucei were detected using species specific primers. DISCUSSION: This study shows the parasitological evidence on the occurrence of animal African trypanosomiasis and also demonstrated that there is likely no active transmission of human African trypanosomiasis in the study areas. CONCLUSION: This study shows that there is likely no active transmission of human African trypanosomiasis going on in these localities since no human infective form of the parasite was detected.
ABSTRACT
OBJECTIVE: To determine the relationship between asymptomatic malaria parasitemia and some oxidative stress parameters in pregnant Nigerian women. METHODS: This is a cross-sectional study involving 130 normal pregnant women at various trimesters, who were attending antenatal clinic at the University of Nigeria Teaching Hospital (UNTH) and Kenechukwu Specialist Hospital in Enugu. A comparable group (control), made of 30 non pregnant women was also recruited. After a 24 hour dietary recall, serum levels of vitamin A, C and malondialdehyde (MDA) were determined by colorimetric method, while vitamin E was determined by absorptiometric method. RESULTS: There were no statistically significant differences in age, parity, estimated calorie, vitamins A, C and E intake between the pregnant and non pregnant groups (P> 0.05). The serum level of the vitamins (umol/L) and MDA (umol/L) in control, 1st, 2nd and 3rd trimesters respectively were: (1)Vitamin A: 1.6±0.36 vs 0.6±0.26 vs 0.62± 0.33 vs 0.46± 0.21 (P < 0.0001); (2) Vitamin C: 75.65±14.15 vs 62.97±24.4 vs 37.85±15.19 vs 28.94±8.52 (P<0.0001); (3) Vitamin E: 3.01± 1.32 vs 3.45±2.01 vs 9.36±2.75 vs 9.82±2.97 (P<0.0001); (4) MDA: 1.42± 0.02 vs 1.61±0.02 vs 1.79±0.02 vs 2.03±0.05 (P<0.0001). However, there were no significant changes in the serum level of the vitamins and MDA between the positive and the negative parasitemia subjects (P>0.05). CONCLUSIONS: Asymptomatic malaria parasitemia does not induce additional oxidative stress on pregnant women in Nigeria. The enormity of acute and complicated attack should be further investigated.
