Objective: Quercetin is a phytoestrogen that exerts both in vitro agonistic and antagonistic activities on estrogen receptors. The present study evaluated the in vivo estrogen-like activity of quercetin on the reproductive organs of female rats. For this purpose, a partial estrogen agonist tamoxifen (TMX) and an estrogen antagonist fulvestrant (FLV) were used to mimic and antagonize the effects of estrogen on uterine tissue, respectively. 4-Vinylcyclohexene dioxide (VCD) was used to induce primary ovarian failure in rats.
Materials and Methods:In experiment 1, immature female rats (21-22 days old) were treated with a vehicle (control), quercetin (10, 30, and 90 mg/kg), 10 mg/kg of quercetin (Q10)+TMX, Q10+ FLV, 17β-estradiol (17βE), 17βE+TMX, or 17βE+FLV. In experiment 2, prepubertal female rats (28-29 days old) were treated with a vehicle (dimethyl sulfoxide), VCD-alone, VCD+Q10, or VCD+17βE. A uterotrophic assay and histological analysis of uteri were performed. The partial estrogen agonist TMX and the estrogen antagonist FLV were used to mimic and antagonize the effects of estrogen on uterine tissue, respectively. VCD was used to induce primary ovarian failure in rats.Results: In immature female rats, the uterine weight was significantly higher in animals treated with Q10 compared to those treated with the vehicle. Although TMX did not result in a significant change, FLV significantly decreased the uterine weight in Q10-treated rats. In prepubertal female rats, the uterine weight significantly decreased in VCD±Q10-or 17βE-treated animals compared that in VCD-treated animals. Although the endometrial thickness was unchanged in Q10-treated animals, it was significantly decreased in the Q10+FLV-treated animals. VCD significantly decreased the endometrial thickness, which was prevented by Q10.
Conclusion:Quercetin may have a dose-dependent and biphasic effect on the uterus by modulating estrogen receptors.
In the present study a microwave-assisted one-pot method was applied for the synthesis of 18 novel condensed 1,4-dihydropyridines carrying the indole moiety. The compounds were achieved by the reaction of appropriate 1,3-cyclohexanedione, substituted indole carboxaldehyde derivative, alkyl acetoacetate and ammonium acetate in methanol, according to a modified Hantzsch reaction. The structure elucidation of the compounds was carried out by spectral methods including X-ray studies. Their spasmolytic activities through calcium channel blockade were assayed on isolated rat ileum. The obtained results indicated that the introduction of the brom atom on the indole ring altered the mentioned activity positively.
Bu çalışmada sıçan modelinde tek akciğer ventilasyonuna bağlı akciğer hasarı üzerine melatoninin koruyucu etkisi araştırıldı.
Ça lış ma pla nı:Toplam 20 adet Sprague-Dawley cinsi sağlıklı erkek sıçan kontrol (n=10) ve melatonin (n=10) grubu olmak üzere iki eşit gruba randomize edildi. Kontrol grubuna 60 dk. süreyle tek akciğer ventilasyonunu takiben, 30 dk. süreyle çift akciğer ventilasyonu uygulandı. Melatonin grubundaki sıçanlara deneye başlamadan 10 dakika önce 10 mg/kg intraperitoneal melatonin verildi. Her iki ventilasyon süresinin sonunda biyokimyasal ve histopatolojik inceleme için kontrol ve melatonin gruplarından akciğer doku örnekleri alındı. Doku süperoksit dismutaz, malondialdehit ve tümör nekroz faktöralfa düzeyleri ölçüldü. Akciğer doku örnekleri alveolar konjesyon, intraalveoler kanama, lökosit ve lenfosit infiltrasyonunun varlığı ve miktarı açısından değerlendirildi.Bul gu lar: Çalışma sonunda, melatonin grubunda akciğer dokusunda malondialdehid (3.8±0.9'e kıyasla 1.8±0.8 µM; p<0.001) ve tümör nekroz faktör-alfa (47.2±15.0'e kıyasla 21.8±7.2 pg/mL; p<0.001) düzeyleri, kontrol grubuna kıyasla, anlamlı düzeyde düşük bulundu. Melatonin grubunun süperoksit dismutaz düzeyleri her iki ventilasyon süresi sonunda arttı ve tek akciğer ventilasyonunun sonundaki artış istatistiksel olarak anlamlı bulundu (0.6±0.2'ye kıyasla 1.3±0.7 U/mL; p<0.05). Histopatolojik incelemede melatonin grubunda doku hasarının daha az olduğu gözlendi. Bu grupta alveolar konjesyonda da anlamlı bir azalma görüldü (p= 0.0401). Melatonin grubunda diğer histopatolojik parametreler azalmakla birlikte, anlamlı bir fark görülmedi.So nuç: Çalışma sonuçlarımız melatoninin sıçanlarda hem biyokimyasal hem de histopatolojik düzeyde tek akciğer ventilasyonunun neden olduğu akciğer hasarı üzerinde koruyucu etkilere sahip olduğunu göstermektedir.
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