Abstract
Progesterone has been shown to stimulate glycogen catabolism in uterine epithelial cells. Acid α-glucosidase (GAA) is an enzyme that breaks down glycogen within lysosomes. We hypothesized that progesterone may stimulate glycogenolysis in the uterine epithelium via GAA. We found that GAA was more highly expressed in the stroma on Day 1 than on Day 11. However, GAA did not appear to differ in the epithelium on Days 1 and 11. Progesterone (0-10 μM) had no effect on the levels of the full-length inactive protein (110 kDa) or the cleaved (active) peptides present inside the lysosome (70 and 76 kDa) in immortalized bovine uterine epithelial (BUTE) cells. Furthermore, the activity of GAA did not differ between the BUTE cells treated with 10 μM progesterone or control. Overall, we confirmed that GAA is present in the cow endometrium and BUTE cells. However, progesterone did not affect protein levels or enzyme activity.
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