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OBJECTIVE: To analyze the effects of variable durations of loud noise stress on the histomorphology of the thyroid gland in adult rats. METHODS: This laboratory-based experimental study was conducted at the Anatomy Department, Army Medical College/National University of Medical Sciences, Rawalpindi, Pakistan, from January to December 2020. Thirty Sprague Dawley rats were divided into three groups: Control group A (no noise exposure), experimental group B (100 dB noise for 4 hours daily), and experimental group C (100 dB noise for 6 hours daily) for four months. At the end of the experiment, the rats were weighed, euthanized, and their thyroid glands removed. The glands were analyzed microscopically after Haematoxylin and Eosin staining, measuring the diameter and epithelial height of thyroid follicles. RESULTS: All rats remained healthy with no statistically significant differences in weight gain between the groups. The follicular epithelial height significantly increased in groups B (9.86±0.38 µm) and C (10.37±0.39 µm) compared to the control group A, (p-values <0.001 and 0.001, respectively). The follicular diameter significantly decreased in groups B (86.61±7.68 µm) and C (95.47±5.24 µm) compared to group A, (p-values <0.001 and 0.003, respectively. Microscopic examination revealed that experimental groups exhibited disrupted thyroid follicles and increased inflammatory infiltrates compared to controls. CONCLUSION: Exposure to variable durations of loud noise stress in adult rats leads to histomorphological changes in the thyroid gland, including increased follicular epithelial height and reduced follicular diameter. These findings are suggestive of potential hyperactivity of thyroid follicles in response to noise stress exposure. [ABSTRACT FROM AUTHOR]

Objective: To determine the preventive effect of coenzyme Q10 (CoQ10) on the testicular histology of rats exposed chronically to mosquito coil smoke., Study Design: Experimental study. Place and Duration of the Study: Department of Anatomy, Army Medical College/National University of Medical Sciences, Rawalpindi, Pakistan, from January to December 2020., Methodology: Thirty male Sprague Dawley rats were divided into three groups of 10 rats each. Group A was the healthy control. Group B rats were exposed to allethrin-based mosquito coil smoke for 12 weeks (4 hours/day). Group C rats received coenzyme Q10 (CoQ10, 10mg/kg/day) through oral gavage, in addition to 12 weeks of mosquito coil smoke exposure (4 hours/day). At the end of the study, testicular histology was compared among three groups including the germinal epithelium height, seminiferous tubule diameter, and testicular capsule thickness, while adjusting for the body weight variations among rats., Results: The rats in Group B, exposed only to mosquito coil smoke showed testicular disruption, characterised by dilated seminiferous tubules (p <0.001), reduced germinal epithelial height (p <0.001), and thickened testicular capsule (p <0.007), as compared to the control group rats. However, the germinal epithelium height (p = 0.73) and testicular capsule thickness (p = 0.31) of rats receiving CoQ10 in addition to mosquito coil smoke inhalation were not significantly different from the control group., Conclusion: Prolonged inhalation of allethrin-based mosquito coil smoke can cause testicular disruption among rats. The oral CoQ10 administration can effectively prevent the histomorphological adverse effects on the testis among rats exposed to mosquito coil smoke., Key Words: Allethrin, Coenzyme Q10, Germinal epithelium, Mosquito coil, Seminiferous tubules, Testicular capsule.