Estrogen receptor-beta is the predominant estrogen receptor subtype in human oral epithelium and salivary glands

• Published in: Journal of endocrinology Vol. 180; no. 1; pp. 55 - 62
• Main Authors: Valimaa, H, Savolainen, S, Soukka, T, Silvoniemi, P, Makela, S, Kujari, H, Gustafsson, JA, Laine, M
• Format: Journal Article
• Language: English
• Published: Colchester BioScientifica 01-01-2004; Portland Press
• Subjects: Adult; Aged; Aging - physiology; Biological and medical sciences; Cheek; Estrogen Receptor beta; Female; Fundamental and applied biological sciences. Psychology; Gingiva; Humans; Immunohistochemistry - methods; Keratinocytes - chemistry; Male; Medicin och hälsovetenskap; Middle Aged; Mouth Mucosa - chemistry; Receptors, Estrogen - analysis; Salivary Glands - chemistry; Vertebrates: skin, associated glands, phaneres, light organs, various exocrine glands (salt gland, uropygial gland...), adipose tissue, connective tissue; Human; Digestive system; Estrogen; 17β-Estradiol; Salivary gland; Epithelium; Ovarian hormone; Estrogen receptor β; Estrogen receptor α; Sex steroid hormone; Biological receptor; Hormonal receptor; Quantitative analysis
• ISSN: 0022-0795; 1479-6805
• DOI: 10.1677/joe.0.1800055

Many studies have shown that the oral mucosa and salivary glands are sensitive to estrogen action. However, the expression of estrogen receptors (ERs) within these tissues is an area of controversy. ERs exist as two subtypes (ERalpha and ERbeta), and we hypothesized that the incongruity between ER expression and estrogen sensitivity may result from differential expression of ER subtypes in oral tissues. To test this hypothesis, we analyzed oral mucosal and salivary gland samples for ERalpha and ERbeta protein expression by immunohistochemistry from a cross-section of patients attending hospital for surgical problems of the head and neck. ERalpha was not detected in oral buccal and gingival epithelium or in salivary glands. In contrast, ERbeta was widely expressed at high levels in all oral tissues studied. Within these tissues, ERbeta was observed primarily in keratinocytes and salivary gland acinar and ductal cells. Our results demonstrating the expression of only the ERbeta subtype within oral tissues may explain the contradictory results from previous studies investigating ER expression in these tissues. Importantly, these results suggest that estrogens may act via ERbeta in oral tissues and explain the effect of hormonal changes on the oral mucosa as well as on saliva secretion and composition.