Melatonin and probiotic administration ameliorated hyperglycaemia, oxidative stress, and enhanced cytoprotective effect on beta-cells of diabetic rats

Objective

The study aimed at investigating the effects of administering melatonin and a probiotic to streptozotocin-induced diabetic rats on hyperglycaemia, oxidative stress biomarkers and beta-cells.

Design

Type 1 diabetes was induced in 5 months-old male Wistar rats by single intraperitoneal (i.p.) administration of freshly-prepared STZ (60 mg/kg body weight). Six groups of 10 rats were used and treated once daily for six weeks; (1) Healthy control: normal saline only; (2) Pre-treated with Melatonin (MEL); (3) Diabetic control; (4) Diabetic + Treated with MEL; (5) Diabetic + Treated with Probiotic (Prob); (6) Diabetic + Treated with MEL + Prob. Blood glucose, body weight, activities of antioxidant enzymes and malondialdehyde concentration in serum and tissues, reduced glutathione and immunohistochemical assay. Data obtained were expressed as mean ± standard error of the mean (Mean ± SEM) and subjected to ANOVA followed by Tukey's post hoc test.

Results

Melatonin + Probiotic significantly decreased blood glucose concentrations in diabetic treated rats, compared to the diabetic control rats. MEL + Probiotic increased (p < 0.05) superoxide dismutase activity in serum and liver of diabetic rats. MEL + Probiotic reduced (p < 0.05) malondialdehyde concentration in the serum, liver and kidneys, respectively. MEL + Probiotic treated diabetic rats displayed islets with much greater content of insulin.

Conclusion

Melatonin + Probiotic combination was more effective in mitigating hyperglycaemia, oxidative stress, and exerted cytoprotective effect on the beta-cells.

Economic impact assessment of foot-and-mouth disease burden and control in pastoral local dairy cattle production systems in Northern Nigeria: A cross-sectional survey

Milk has been envisaged as a major source of high-quality protein and bioavailable nutrients to humans. Its production is constraint by foot and mouth disease (FMD), a contagious viral disease of very high economic importance worldwide. This study was aimed at assessing the economic impact of FMD in pastoral dairy cattle herds in Nigeria and determines returns to investments in its control to better inform policy decisions. An interview questionnaire-based cross-sectional study was conducted in 660 nomadic and agro-pastoral dairy cattle herds in 2019. Economic impact analyses were conducted using the total economic cost and benefit-cost analysis models. Of the 660 pastoralists enrolled, 92.6% (n = 611) participated. Nomadic pastoralists constituted 50.7% (n = 310) of the respondents while 49.3% (n = 301) were agro-pastoralists. Most of the respondents (66.4%, n = 406) had no formal education. The value of visible losses to the herders was estimated at USD 15,591,694.30 and the cost of control by treatment of secondary infections was USD 463,673.70. The economic impact of FMD due to production losses and costs of treatment to pastoralists was estimated to be USD 16,055,368.00. Return on investment in FMD control was positive with a benefit-cost ratio of 33.6. The estimated total economic costs due to FMD have indicated that it is a disease of high economic importance to dairy production herds and must be controlled to assure food security, local incomes to herders, and protein requirement of human population, especially the children in FMD endemic countries.

Relevance of moldy fungi as agents of chronic lower respiratory tract infection in patients seen in Maiduguri, Nigeria

BACKGROUND

In Maiduguri, Nigeria in the 1990's, we had available to us only the direct Acid Fast Bacilli (AFB) smear method to diagnose tuberculosis (TB), and no facility for TB culture. Because the clinical and radiologic manifestations of lower respiratory tract (LRT) fungal infections are difficult to differentiate from those of LRT TB, it was not clear how many of the direct AFB smear negative patients had fungal infections, or were true negatives for TB.

OBJECTIVE

To assess sputum samples from patients with suspected lower respiratory tract infection for non-candidal fungal isolates as well as Mycobacterium tuberculosis.

METHODS

Smears of sputum samples were examined microscopically for fungal hyphae and AFB. Sputum samples were also plated onto different fungal culture media. Isolation data were correlated with clinical and radiological data, to determine their clinical significance.

RESULTS

Of the 274 patients seen, 41(15%) had positive sputum for AFB, while 61(22.3%) had positive sputum for fungal isolates. The most common fungal isolates were Aspergillus spp (42.9%), Scopulariopsis (14.3%), Chrysosporium (8.9%), Penicillium (7.1%), Fusarium (7.1%) and Acremonium (5.4%). No patient with mold isolate had cavitary lung disease, while 62.5% of TB patients had cavitary disease. Extensive disease (54.2%) and abnormal chest x-ray (91.7 %) were characteristic of patients with TB but very rare in patients with fungal infection.

CONCLUSION

We therefore conclude that serious lower respiratory tract fungal infection was rare and that extensive or cavitary disease was usually due to pulmonary TB. The clinical diagnosis of TB under defined conditions, as in our setting, still has great utility.