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Lack of effects of 1,25- and 24,25-dihydroxy vitamin D on parathyroid hormone response to hypocalcemia in cattle. 1984

B Voumard, and U Trechsel, and J A Fischer, and J W Blum

Effects of 1,25(OH)2D3 or 24,25(OH)2D3 on plasma PTH were examined following induced hypocalcemia with EGTA. EGTA infusions caused an elevation of plasma PTH within 10 min. Sixty min after the start of EGTA infusions, 1,25(OH)2D3 or 24,25(OH)2D3 were IV administered. Transient (within 5 min) elevations in plasma PTH were observed in two of five animals following the administration of 1,25(OH)2D3 or of 24,25(OH)2D3. Neither secosterol had an effect on the induced elevations in plasma PTH during the remaining 60 min of the EGTA infusions. Twenty-two hr following 24,25(OH)2D3 administration, plasma PTH, ionized and total calcium, inorganic phosphate, and magnesium were normal, while plasma 24,25(OH)2D was elevated. The plasma PTH response to EGTA-induced hypocalcemia was not significantly altered from that observed prior to the administration of 24,25(OH)2D3. Animals, which were IV injected with 1,25(OH)2D3 received the same amount IM 60 min later. Twenty-two h following IM 1,25(OH)2D3, plasma 1,25(OH)2D, ionized and total calcium, and plasma inorganic phosphate were elevated. Plasma PTH and magnesium were lowered. The PTH response to EGTA-induced hypocalcemia was significantly reduced in these animals. A similar reduction in the PTH response to induced hypocalcemia was observed in animals receiving 7 hr IV infusions of calcium chloride. The findings suggest that the blunted response was, in part, the consequence of the preceding hypercalcemia. These results indicate that 1,25(OH)2D3 does not directly regulate plasma PTH secretion and that 24,25(OH)2D3 has no effect on plasma PTH during induced hypocalcemia in the bovine species.

UI MeSH Term Description Entries
D006996 Hypocalcemia Reduction of the blood calcium below normal. Manifestations include hyperactive deep tendon reflexes, Chvostek's sign, muscle and abdominal cramps, and carpopedal spasm. (Dorland, 27th ed) Hypocalcemias
D008274 Magnesium A metallic element that has the atomic symbol Mg, atomic number 12, and atomic weight 24.31. It is important for the activity of many enzymes, especially those involved in OXIDATIVE PHOSPHORYLATION.
D008297 Male Males
D010281 Parathyroid Hormone A polypeptide hormone (84 amino acid residues) secreted by the PARATHYROID GLANDS which performs the essential role of maintaining intracellular CALCIUM levels in the body. Parathyroid hormone increases intracellular calcium by promoting the release of CALCIUM from BONE, increases the intestinal absorption of calcium, increases the renal tubular reabsorption of calcium, and increases the renal excretion of phosphates. Natpara,PTH (1-84),PTH(1-34),Parathormone,Parathyrin,Parathyroid Hormone (1-34),Parathyroid Hormone (1-84),Parathyroid Hormone Peptide (1-34),Hormone, Parathyroid
D010710 Phosphates Inorganic salts of phosphoric acid. Inorganic Phosphate,Phosphates, Inorganic,Inorganic Phosphates,Orthophosphate,Phosphate,Phosphate, Inorganic
D002117 Calcitriol The physiologically active form of vitamin D. It is formed primarily in the kidney by enzymatic hydroxylation of 25-hydroxycholecalciferol (CALCIFEDIOL). Its production is stimulated by low blood calcium levels and parathyroid hormone. Calcitriol increases intestinal absorption of calcium and phosphorus, and in concert with parathyroid hormone increases bone resorption. 1 alpha,25-Dihydroxycholecalciferol,1 alpha,25-Dihydroxyvitamin D3,1, 25-(OH)2D3,1,25(OH)2D3,1,25-Dihydroxycholecalciferol,1,25-Dihydroxyvitamin D3,1 alpha, 25-dihydroxy-20-epi-Vitamin D3,1,25(OH)2-20epi-D3,1,25-dihydroxy-20-epi-Vitamin D3,20-epi-1alpha,25-dihydroxycholecaliferol,Bocatriol,Calcijex,Calcitriol KyraMed,Calcitriol-Nefro,Decostriol,MC-1288,MC1288,Osteotriol,Renatriol,Rocaltrol,Silkis,Sitriol,Soltriol,Tirocal,1 alpha,25 Dihydroxyvitamin D3,1,25 Dihydroxycholecalciferol,1,25 Dihydroxyvitamin D3,1,25 dihydroxy 20 epi Vitamin D3,Calcitriol Nefro,D3, 1 alpha,25-Dihydroxyvitamin,D3, 1,25-Dihydroxyvitamin,D3, 1,25-dihydroxy-20-epi-Vitamin,KyraMed, Calcitriol,MC 1288
D002417 Cattle Domesticated bovine animals of the genus Bos, usually kept on a farm or ranch and used for the production of meat or dairy products or for heavy labor. Beef Cow,Bos grunniens,Bos indicus,Bos indicus Cattle,Bos taurus,Cow,Cow, Domestic,Dairy Cow,Holstein Cow,Indicine Cattle,Taurine Cattle,Taurus Cattle,Yak,Zebu,Beef Cows,Bos indicus Cattles,Cattle, Bos indicus,Cattle, Indicine,Cattle, Taurine,Cattle, Taurus,Cattles, Bos indicus,Cattles, Indicine,Cattles, Taurine,Cattles, Taurus,Cow, Beef,Cow, Dairy,Cow, Holstein,Cows,Dairy Cows,Domestic Cow,Domestic Cows,Indicine Cattles,Taurine Cattles,Taurus Cattles,Yaks,Zebus
D002418 Cattle Diseases Diseases of domestic cattle of the genus Bos. It includes diseases of cows, yaks, and zebus. Bovine Diseases,Bovine Disease,Cattle Disease,Disease, Bovine,Disease, Cattle,Diseases, Bovine,Diseases, Cattle
D004100 Dihydroxycholecalciferols Cholecalciferols substituted with two hydroxy groups in any position. Dihydroxyvitamins D
D004533 Egtazic Acid A chelating agent relatively more specific for calcium and less toxic than EDETIC ACID. EGTA,Ethylene Glycol Tetraacetic Acid,EGATA,Egtazic Acid Disodium Salt,Egtazic Acid Potassium Salt,Egtazic Acid Sodium Salt,Ethylene Glycol Bis(2-aminoethyl ether)tetraacetic Acid,Ethylenebis(oxyethylenenitrile)tetraacetic Acid,GEDTA,Glycoletherdiamine-N,N,N',N'-tetraacetic Acid,Magnesium-EGTA,Tetrasodium EGTA,Acid, Egtazic,EGTA, Tetrasodium,Magnesium EGTA

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