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Quercetin Reduces Vascular Permeability in an Experimental Rat Model of Ovarian Hyperstimulation Syndrome: A Comparative Histochemical and Immunohistochemical Study with Cabergoline

Gazezoglu OU, Gokcimen A, Eken MK, Cevik O

2026

Abstract

Abstract This study investigated the effects of quercetin and cabergoline on ovarian histomorphology, biochemical changes and the vascular endothelial growth factor (VEGF)–pigment epithelium-derived factor (PEDF)- cyclooxygenase-2 (COX-2) axis in an experimental rat model of ovarian hiperstimulation syndrome (OHSS). Forty-two immature female Wistar rats were randomly divided into six groups: Control, OHSS, Quercetin, Cabergoline, OHSS+Quercetin, and OHSS+Cabergoline. Ovarian morphology was assessed by measuring ovarian weight and diameter. Histological examination was performed with hematoxylin and eosin (H&E) staining, and immunohistochemical analyses were conducted to determine VEGF, PEDF, and COX-2 expression in ovarian tissue. Vascular permeability was evaluated spectrophotometrically using Evans Blue dye extravasation, while serum TNF-α and estradiol levels were determined by ELISA. The OHSS group showed significantly increased ovarian weight and diameter compared with the other groups. VEGF and COX-2 expression were increased, whereas PEDF immunoreactivity was reduced in granulosa cells. In the treatment groups, VEGF and COX-2 expression were similar patterns, but PEDF expression was higher in the OHSS+Cabergoline group. Vascular permeability was significantly lower in the OHSS+Quercetin group than in the OHSS+Cabergoline group, indicating a stronger protective effect of quercetin on vascular integrity. Quercetin reduced vascular permeability, although most…

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Evidence Hub reads this as a preprint, done in animal, not in people. Its evidence level is 5 of 5 (Very low · case / narrative / animal / in vitro / in silico). Case reports, narrative reviews, and animal, cell or computer-model studies give the weakest evidence for human health.

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