The photoperiod and heat stress effects on histometrical structure of rat prostate gland
Message:
Abstract:
Background
There is not enough information about the effects of heat stress and photoperiod on different lobes structure.
Objectives
The present study aims at determining the histological changes and the rate of changes in each lobes of rat prostate, affected by photoperiod changes and heat stress.
Methods
To this end, 15 adult male wistar rats were divided to three groups: 1. the control group in which the rats were kept in 12L: 12D and 25°C temperature condition, 2. the heat stress group in which the rats were kept in 12L: 12D and 42+1 °Ctemperature condition for 4 to 5 hours per day, and 3. the photoperiod group in which the rats were kept in 16L: 8D and 25°C temperature condition. After 30 days, samples were taken from different lobes and sections with 5 to 6μ thickness were made and stained by H&E and PAS.
Results
The microscopic results showed that histomorphometrical structure and histochemical reactions of the different lobs of normal prostate of the rats are different. The proportion of parenchyma to stroma decreased by heat stress; however, it increased by photoperiod. The maximum changes were seen in ventral lobe. The epithelial thickness, lumen diameter, and number of secretory units also increased by photoperiod (16L:8D), but it decreased by heat stress. The number of secretory cells were increased by heat stress because the cell size decreased; however, they decreasedby long photoperiod regime. The number of folded secretory units increased by photoperiod, while heat stress has an adverse effect (p<0.001). The serum testosterone increased by long photoperiod and decreased by heat stress (p<0.01).
Conclusions
This study shows that long photoperiod has important effects on increasing the rat prostate parenchyma and its activity.
Language:
English
Published:
Iranian Journal of Veterinary Medicine, Volume:8 Issue: 4, Autumn 2014
Pages:
243 to 248
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