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• W2143145231 abstract "Cellular interactions mediated by both contact-dependent and contact-independent mechanisms are probably important to maintain luteal function. The objective of the present study was to evaluate the role of cAMP in regulation of contact-dependent gap junctional intercellular communication (GJIC) of bovine luteal cells from several stages of luteal development. In experiment 1, corpora lutea (n = 5) from the mid-luteal phase of the estrous cycle were dissociated with collagenase, and cells were preincubated in a medium with serum. Then the medium was changed to serum-free media containing a cAMP agonist (dbcAMP; 1 mM) or antagonist (Rp-cAMPS; 0, 3, 10, 30, or 100 µM). In experiment 2, corpora lutea from the early (n = 7), mid- (n = 6), and late (n = 6) luteal phases of the estrous cycle were dissociated and preincubated as in experiment 1, and luteal cells were then incubated with no treatment, LH (100 ng/ml), dbcAMP (1 mM), forskolin (1 µM), Rp-cAMPS (100 µM), or LH+Rp-cAMPS. After incubation of luteal cells with treatments for 18–24 h, media were collected for determination of progesterone and cAMP concentrations. Then the rate of GJIC was evaluated for selected cells (small luteal cells in contact with small luteal cells, and large luteal cells in contact with small luteal cells) by using the fluorescence recovery after photo-bleaching technique and laser cytometry. In experiment 1, dbcAMP increased (p < 0.01) but Rp-cAMPS (p < 0.05) decreased GJIC between small luteal cells and between large and small luteal cells. In addition, dbcAMP stimulated (p < 0.01) but Rp-cAMPS did not affect progesterone secretion. In experiment 2, treatments affected (p < 0.05) GJIC and progesterone production of luteal cells from the mid- and late but not from the early luteal phase of the estrous cycle. GJIC between small luteal cells was increased (p < 0.01) by LH, dbcAMP, and forskolin. GJIC between large and small luteal cells was increased (p < 0.05) by dbcAMP and forskolin. Rp-cAMPS decreased (p < 0.01) GJIC between small luteal cells (mid-luteal phase) and between large and small luteal cells (mid- and late luteal phases). In addition, Rp-cAMPS inhibited (p < 0.05) the stimulatory effects of LH on GJIC between small luteal cells from the mid- and late luteal phases of the estrous cycle. For luteal cells from the mid- and late luteal phases, progesterone production was increased (p < 0.05) by LH, dbcAMP, forskolin, and LH+Rp-cAMPS, but was not affected by Rp-cAMPS. Across all stages of the estrous cycle, cyclic AMP accumulation in media was greater (p < 0.05) in LH- and forskolin-treated cultures than in control cultures and was greater (p < 0.01) in forskolin-treated than in LH-treated cultures. These data demonstrate that small and large luteal cells communicate with each other and that the rate of GJIC is modulated by LH and cAMP, as has been shown previously for other cell types. Thus, cAMP appears to be involved in the regulation of GJIC within the bovine corpus luteum, which probably is an important mechanism for coordinating luteal cell function." @default.
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• W2143145231 date "1996-03-01" @default.
• W2143145231 modified "2023-10-17" @default.
• W2143145231 title "Gap Junctional Intercellular Communication of Bovine Luteal Cells from Several Stages of the Estrous Cycle: Effects of Cyclic Adenosine 3′,5′-Monophosphate1" @default.
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• W2143145231 doi "https://doi.org/10.1095/biolreprod54.3.538" @default.
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