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Fraction of Auxemma oncocalyx and Oncocalyxone A Affects the In Vitro Survival and Development of Caprine Preantral Follicles Enclosed in Ovarian Cortical Tissue.

BACKGROUND: Auxemma oncocalyx and its main component oncocalyxone A (onco A) have a high level of antioxidant and antitumor activity, but there are no studies on the action of both of these drugs regarding folliculogenesis.

MATERIAL AND METHODS: Caprine ovarian tissue fragments were fixed (non-cultured control) or cultured for 1 or 7 days in α-MEM+ alone (cultured control) or supplemented with dimethyl sulfoxide (DMSO; 20% v/v), bone morphogenetic protein 15 (BMP-15; 100 ng/ml), doxorubicin (DXR; 0.3 g/ml), or different concentrations of A. oncocalyx (1.2, 12, or 34 g/ml) or onco A (1, 10, or 30 g/ml). We analyzed for follicular morphology and growth, apoptosis (terminal deoxynucleotidyl transferase dUTP-biotin nick end labeling (TUNEL) assay), and cell proliferation (silver staining of argyrophilic nucleolus organizer regions (AgNOR) and test for proliferating cell nuclear antigen (PCNA)).

RESULTS: A. oncocalyx and onco A (in a concentration-dependent manner) and DXR decreased (P < 0.05) the number of morphologically normal follicles, with no effect (P > 0.05) on follicular growth. A. oncocalyx reduced (P < 0.05) the percentage of normal follicles compared to onco A, whereas DXR, A. oncocalyx 1.2 g/ml, and onco A 1 g/ml increased (P < 0.05) the percentage of TUNEL-positive follicles. DXR decreased (P < 0.05) the number of nucleolus organizer regions.

CONCLUSION: A. oncocalyx and onco A affected the in vitro caprine folliculogenesis in a concentration-dependent manner. Onco A (1 g/ml) has a less harmful effect than DXR on goat preantral follicle survival.

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