title: Production of prostaglandins by dispersed cells and fragments from bovine parathyroid glands.
abstract: We studied the production of prostaglandins by fragments and dispersed cells from bovine parathyroid glands. Fragments released 138 +/- 19 (SE), 132 +/- 21, 4.3 +/- 0.5, and 13 +/- 6.6 pg/mg/h of 6-keto-PGF1 alpha, PGF2 alpha, PGE2, and thromboxane B2, respectively (n = 7 - 26), while dispersed cells released 414 +/- 110, 22 +/- 7.3, 27 +/- 3.8, and 29 +/- 11 pg/10(6) cells/h, respectively, of the same compounds (n = 6 - 25). Indomethacin (1 microgram/ml) inhibited the release of 6-keto-PGF1 alpha by 80-90% in fragments and cells, while mellitin stimulated release of this prostaglandin, suggesting de novo synthesis of prostaglandins in these preparations. Calcium stimulated production of 6-keto-PGF1 alpha by 1.3-fold in cells and 2.6-fold in fragments and also enhanced production of PGF2 alpha by 1.9-fold in fragments. Isoproterenol, on the other hand, had no effect on production of 6-keto-PGF1 alpha in either preparation. These results demonstrate that parathyroid tissue as well as parathyroid cells per se produce a variety of prostaglandins. We have previously shown that PGE2 and PGF2 alpha modulate cAMP accumulation and PTH release in dispersed bovine parathyroid cells. The role of the endogenous production of prostaglandins by the parathyroid gland in the acute or chronic regulation of parathyroid function, however, remains to be determined.
mesh_terms: D015121:6-Ketoprostaglandin F1 alpha / Q000096:biosynthesis; D000818:Animals; D002118:Calcium / Q000494:pharmacology; D002417:Cattle; D002478:Cells, Cultured; D015237:Dinoprost; D015232:Dinoprostone; D011464:Epoprostenol / Q000494:pharmacology; D007213:Indomethacin / Q000494:pharmacology; D007545:Isoproterenol / Q000494:pharmacology; D007700:Kinetics; D008555:Melitten / Q000494:pharmacology; D010280:Parathyroid Glands / Q000187:drug effects / Q000378:metabolism*; D010281:Parathyroid Hormone / Q000378:metabolism; D011453:Prostaglandins / Q000096:biosynthesis*; D011458:Prostaglandins E / Q000096:biosynthesis; D011460:Prostaglandins F / Q000096:biosynthesis; D013929:Thromboxane B2 / Q000096:biosynthesis
chemical_list: D010281:Parathyroid Hormone; D011453:Prostaglandins; D011458:Prostaglandins E; D011460:Prostaglandins F; D008555:Melitten; D013929:Thromboxane B2; D015121:6-Ketoprostaglandin F1 alpha; D015237:Dinoprost; D011464:Epoprostenol; D015232:Dinoprostone; D007545:Isoproterenol; D002118:Calcium; D007213:Indomethacin