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Porcine granulosa cells were incubated with commercially available glycosaminoglycans (GAGs) or GAGs purified from porcine follicular fluid to evaluate the effects of GAGs on degradation of low-density lipoproteins (LDL) and progesterone production. Commercially available heparin and chondroitin sulfates (CS) as well as follicular CS and heparan sulfate (HS) inhibited degradation of LDL in dose-dependent manners. Doses of follicular CS and HS required to inhibit 50% of the LDL degradation corresponded to concentrations found in follicular fluid (less than 1 mg/ml). Progesterone production was also inhibited in a dose-dependent fashion by follicular GAGs at concentrations found in follicles. The ability of the follicular GAGs to inhibit degradation of LDL could represent a mechanism by which the utilization of LDL-derived sterol is temporarily restricted following permeabilization of the ovulatory follicle. Follicular GAGs may also modulate utilization of apoprotein E-containing high-density lipoproteins in unruptured follicles.

Follicular Fluid Glycosaminoglycans Inhibit Degradation of Low-Density Lipoproteins and Progesterone Production by Porcine Granulosa Cells1