Abstract
Isotretinoin broad effectiveness is limited by its detrimental effect on the Meibomian glands. Androgens have been reported to regulate the Meibomian gland function. Dehydroepiandrosterone (DHEA) is an androgen precursor considered as an efficient and physiological anti-ageing skin agent. This study aimed to investigate the role of the topical DHEA in ameliorating Meibomian gland dysfunction caused by isotretinoin employing different histological and immunohistochemical techniques. Twenty-four adult male albino rats were divided into four equal groups; control group, DHEA-treated group (1% twice daily for 3 months), isotretinoin-treated group (0.5mg/kg/day for 3 months), and both isotretinoin and DHEA-treated group. Meibomian gland specimens were processed for light microscopy. Immunohistochemical study was carried out using antibodies for proliferating cell nuclear antigen (PCNA), androgen receptor (AR) and estrogen receptor-alpha (ER-α). Sections from the isotretinoin-treated group revealed a reduction in the number and size of acini. Thickening and keratinization of the epithelial lining of the ducts were observed. Multiple degenerated acini and casts of acinar cells in the ducts of Meibomian glands were detected. Some dilated congested blood vessels and mononuclear cells were occasionally seen. A significant decrease in PAS reaction and a significant increase in collagen fiber content were detected. Immunohistochemical study revealed a significant increase in immunoexpression of PCNA in basal ductal cells coupled with decreased expression in basal acinar cells. Both AR and ER-α immunoexpression was significantly decreased. Minimal alterations were observed upon concomitant treatment with isotretinoin and DHEA as compared to the control group. Topical DHEA could prove to be beneficial in ameliorating isotretinoin-induced Meibomian gland dysfunction most probably through its androgenic effect.
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