The effect of long exposure to uvb rays on histological features of wistar rats (Rattus norvegicus) in photoaging model

Abstract

Introduction: Indonesia is a tropical country with exposure to UV rays from the sun throughout the year, so the Indonesian population is very vulnerable to skin aging, especially extrinsic skin aging due to prolonged exposure to UV rays. This study aimed to determine the effect of long exposure to UVB rays on the thickness of the epidermis, the thickness of the dermis, and the number of blood vessels and sunburn cells in (Rattus norvegicus) Wistar strain. Methods: This research was a post-test-only control group design using 27 rats which were divided into 3 groups, namely: control group K was untreated rats, and treatment groups P1 and P2 were rats exposed to UVB radiation for 3 weeks and 6 respectively exposure weeks. Test the effect on the study using the One-Way ANOVA test and Tukey’s Post Hoc Test. Results: The results indicated an increase in epidermal thickness of groups P1 (44.87 μm) and P2 (56.90 μm) (significant p<0.05). A decrease in dermis thickness occurred in groups P1 (726.91 μm) and P2 (559.40 μm) (significant p<0.05). In the photoaging area, there was an increased amount of sunburn cells in group P1 (6.40) and P2 (11.40) (significant p<0.05). There was a difference in the number of blood vessels between groups K and P2 and groups P1 and P2 (p<0.05). Conclusion: There was an effect of long exposure to UVB rays on histology in rats (Rattus norvegicus) of the photoaging model including the thickness of the epidermis layer and dermis layer, the number of blood vessels, and sunburn cells.