Cyclic nucleotides and the rapid inhibitions of bone 45Ca uptake in response to bovine parathyroid hormone and 16,16-dimethyl prostaglandin E2 in chicks

Intravenous injection of chicks with bovine parathyroid hormone (1-34) (3.3 micrograms/100 g body wt.) or 16,16-dimethyl PGE2 (5 micrograms/100 g body wt.) caused rapid (3 minute) net inhibition of 45Ca uptake into femur and calvarium. These agents also elevated bone adenosine 3',5'-cyclic...

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Bibliographic Details
Published in:Calcified tissue international 1989-03, Vol.44 (3), p.209-213
Main Authors: SHAW, A. J, DACKE, C. G
Format: Article
Language:English
Subjects:
1-Methyl-3-isobutylxanthine - pharmacology
16,16-Dimethylprostaglandin E2 - pharmacology
Animals
Biological and medical sciences
Bone and Bones - analysis
Bone and Bones - physiology
Bucladesine - pharmacology
Caffeine - pharmacology
Calcium - pharmacokinetics
Calcium Radioisotopes
Cell physiology
Chickens - physiology
Cyclic AMP - analysis
Fundamental and applied biological sciences. Psychology
Male
Mineralization, calcification
Molecular and cellular biology
Nucleotides, Cyclic - physiology
Parathyroid Hormone - pharmacology
Peptide Fragments - pharmacology
Prostaglandins E, Synthetic - pharmacology
Space life sciences
Theophylline - pharmacology
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Summary:Intravenous injection of chicks with bovine parathyroid hormone (1-34) (3.3 micrograms/100 g body wt.) or 16,16-dimethyl PGE2 (5 micrograms/100 g body wt.) caused rapid (3 minute) net inhibition of 45Ca uptake into femur and calvarium. These agents also elevated bone adenosine 3',5'-cyclic monophosphate (cAMP) but not guanosine 3',5'-cyclic monophosphate (cGMP) levels at this time. Methylxanthine phosphodiesterase inhibitors (MXPI), caffeine, theophylline, and 3-isobutyl-1-methylxanthine (IBMX) (0.3-5 mg/100 g body wt.) similarly inhibited net 45Ca uptake into femur and to a lesser extent calvarium. Plasma 45Ca and total Ca levels were unaltered or showed a slight tendency to be increased over control values 3 minutes after injection. However, the effects of the non-MXPI, dibutyryl-cAMP (0.5-5 mg/100 g body wt.) on bone 45Ca uptake were negligible. Of the MXPI, only IBMX elevated total cAMP levels in chick bone at 3 minutes. These data implicate but do not confirm a mediatory role for cAMP in the rapid inhibitory actions of PTH and PGEs on bone net 45Ca uptake in chicks.
ISSN:0171-967X
1432-0827