Comparison of the pharmacokinetics of parenteral parathyroid hormone-(1-34) [PTH-(1-34)] and PTH-related peptide-(1-34) in healthy young humans
| Autor: | D Goltzman, K Klein, L J Fraher, G N Hendy, R Marier, D Freeman, Anthony B. Hodsman |
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| Rok vydání: | 1995 |
| Předmět: |
Adult
Male medicine.medical_specialty Endocrinology Diabetes and Metabolism Clinical Biochemistry Natriuresis Parathyroid hormone chemistry.chemical_element Calcium Biochemistry Phosphates Excretion chemistry.chemical_compound Endocrinology Pharmacokinetics Reference Values Teriparatide Internal medicine Cyclic AMP medicine Humans Infusions Parenteral Volume of distribution Creatinine Parathyroid hormone-related protein business.industry Biochemistry (medical) Parathyroid Hormone-Related Protein Proteins Peptide Fragments chemistry Parathyroid Hormone Female business Hormone |
| Zdroj: | The Journal of Clinical Endocrinology & Metabolism. 80:60-64 |
| ISSN: | 1945-7197 0021-972X |
| DOI: | 10.1210/jcem.80.1.7829640 |
| Popis: | The amino-terminal fragments of human PTH [hPTH-(1-34)] and PTH-related peptide [PTHrP-(1-34)] appear to be equipotent in several rodent models. However, continuous i.v. infusions of these peptides to young human volunteers suggested that a 10-fold higher molar dose of PTHrP was required to produce comparable circulating levels of the peptide and biochemical responses similar to PTH. As PTHrP has a wide variety of target tissues in mammalian species and may, therefore, play a paracrine, rather than an endocrine, hormonal role in vivo, we evaluated whether enhanced metabolic clearance of injected PTHrP might explain its apparently reduced potency as a PTH-like hormone. Ten healthy subjects [age, 25 +/- 9 (+/- SD) yr] received in random order either hPTH-(1-34) or hPTHrP-(1-34) given by bolus i.v. injections in a dose of 10.7 nmol. Measurements of plasma immunoreactive peptide indicated a comparable volume of distribution for each, but the apparent t1/2 (8.3 +/- 1.6 min) and plasma clearance (4.0 +/- 1.4 L/min) for hPTHrP were significantly (P < 0.05) accelerated compared to those of hPTH (t1/2, 10.2 +/- 0.5 min; clearance, 2.0 +/- 0.4 L/min). Peak plasma cAMP levels were 9-fold lower in response to hPTHrP (29.5 +/- 19 vs. 190 +/- 63 pmol/L; P < 0.01), and increases in urinary cAMP excretion were 5-fold lower (2.1 +/- 1.1 vs. 11.2 +/- 3.7 nmol/mmol creatinine; P < 0.01). No major differences were observed in the urinary excretion of phosphate, calcium, or sodium between the two peptides. Although hPTHrP-(1-34) has a 2-fold higher MCR than hPTH-(1-34), this may not explain the more than 5-fold lower plasma or urinary cAMP response to PTHrP in humans. The comparable effects of PTH and PTHrP on urinary phosphate, calcium, and sodium may indicate a non-cAMP-dependent pathway for these responses, although the intracellular pool of cAMP generated to either peptide, and thus the local target tissue response, could not be estimated in the present study. |
| Databáze: | OpenAIRE |
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