Alteration of prostanoid metabolism in rats with magnesium deficiency.
Plasma and tissue concentrations of prostanoids PGE2, PGF2 alpha. 6-keto-PGF1 alpha (a stable metabolite of prostacyclin) and TXB2 (a stable metabolite of thromboxane A2) were measured in normal and magnesium-deficient rats. The mean values for prostanoids in plasma were significantly higher in magnesium-deficient rats than in normals (515 +/- 43 vs 296 +/- 31 pg/ml for 6-keto-PGF1 alpha, p less than 0.01, 3700 +/- 322 vs 346 +/- 33 pg/ml for TXB2, p less than 0.001 and 1234 +/- 132 vs 434 +/- 51 pg/ml for PGE2, p less than 0.001). Tissue levels of prostanoids were also significantly higher in magnesium-deficient rats as compared to normals. The increased synthesis of prostanoids is apparently linked to enhanced influx and translocation of Ca++ into the cells. If the adenylate cyclase is inhibited in magnesium deficiency, the lowered c-AMP will permit a high cyclooxygenase activity and a drastic increase in TXB2. It is possible that the changes in prostaglandin synthesis in magnesium deficiency are linked to the development of different diseases.
D015121:6-Ketoprostaglandin F1 alpha / Q000378:metabolism; D000818:Animals; D016718:Arachidonic Acid; D001095:Arachidonic Acids / Q000378:metabolism; D002118:Calcium / Q000378:metabolism; D000242:Cyclic AMP / Q000378:metabolism; D015237:Dinoprost; D015232:Dinoprostone; D005260:Female; D008275:Magnesium Deficiency / Q000378:metabolism*; D011453:Prostaglandins / Q000378:metabolism*; D011458:Prostaglandins E / Q000378:metabolism; D011460:Prostaglandins F / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D013929:Thromboxane B2 / Q000378:metabolism; D013950:Thymus Gland / Q000378:metabolism
D001095:Arachidonic Acids; D011453:Prostaglandins; D011458:Prostaglandins E; D011460:Prostaglandins F; D016718:Arachidonic Acid; D013929:Thromboxane B2; D015121:6-Ketoprostaglandin F1 alpha; D015237:Dinoprost; D000242:Cyclic AMP; D015232:Dinoprostone; D002118:Calcium