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Effects of standardized isopropanolic black cohosh and estrogen on salivary function in ovariectomized rats.
Biomedicine & Pharmacotherapy 2018 January
Oral dryness is a common feature in menopausal women. Estrogen therapy can relieve this symptom; however, the underlying mechanism was not clear. Standardized isopropanolic black cohosh (Actaea racemosa; Remifemin) can also relieve menopausal symptoms, such as hot flashes and sweating. Our previous study showed that standardized isopropanolic black cohosh could protect the submandibular gland structure. To investigate the effects and possible mechanisms of action of estrogen and standardized isopropanolic black cohosh on submandibular gland function in ovariectomized (OVX) rats, we measured body weight, daily water consumption, and blood flow in the submandibular glands. Immunohistochemistry and western blotting were used to detect the expression of muscarinic acetylcholine receptors 1 (M1) and 3 (M3), and aquaporin 5 (AQP5) in the submandibular gland. OVX increased daily water consumption and reduced vasodilation in the submandibular gland. It suggested that ovariectomy could damage the salviary function. Moreover, the expression of M1 and M3 receptors decreased, whereas that of AQP5 increased. These changes may explain the dysfunction of saliva secretion in menopause. Estrogen and standardized isopropanolic black cohosh treatment had the same effect on daily water consumption and vasodilation in the submandibular gland. It indicated that estrogen and standardized isopropanolic black cohosh could relieve oral dryness in menopause. However, the mechanism of the two treatments may differ because standardized isopropanolic black cohosh only protected against changes in M1 expression, whereas estrogen protected against variations in M1, M3, and AQP5 expression.
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