Abstract
Conclusion: Prostanoid receptors (EP1, EP2, EP3, and EP4) are expressed in the olfactory epithelium (OE), and the EP4 prostanoid receptor may play an important role in the OE. Objective: The purpose of the present study was to investigate the expression and localization of the four types of prostanoid receptors (EP1, EP2, EP3, and EP4) in the OE of normal and methimazole-treated mice to gain more complete knowledge about the functional significance of the prostanoid receptors in OE. Methods: CBA/J mice were used in this study. The localization of the prostanoid receptors (EP1, EP2, EP3, and EP4) in the OE was investigated by immunohistochemistry. The changes in expression of prostanoid receptors were studied in methimazole-treated mice. Furthermore, the effect of EP agonists on the methimazole-induced degeneration of OE was assessed by morphological analysis and by assessment of apoptosis. Results: All four types of EP receptors were recognized in mouse OE. Expression of EP4 in the OE was significantly reduced after methimazole treatment. In the methimazole-treated mice, an EP4 agonist reduced OE damage and apoptosis.
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