Abstract
The object of this study was to determine whether increased circulating levels of parathyroid hormone-related protein (PTH-rp) may explain the increased parathyroid hormone (PTH) bioactivity in pregnancy. In 41 healthy pregnant women (age 19–41 years), PTH-rp and corrected calcium levels were measured and compared with those of nonpregnant control women (n=18, age 20–39 years). PTH-rp and corrected calcium levels were significantly higher in pregnant women (PTH-rp 21.9±7.9 pg/ml, P<0.001; corrected calcium 2.38±0.07 mmol/liter, P=0.001) than in nonpregnant women (PTH-rp 10.3±7.8 pg/ml; corrected calcium 2.30±0.10 mmol/liter). Our data indicate that circulating PTH-rp levels may significantly increase in pregnancy, suggesting a possible role of this peptide in the modification of calcium homeostasis in pregnant women.
Similar content being viewed by others
References
Pitkin RM (1985) Calcium metabolism in pregnancy and in perinatal period: a review. Am J Obstet Gynecol 151:99–109
Reitz RE, Daane TA, Woods JR, Weinstein RL (1977) Calcium, magnesium, phosphorus and parathyroid hormone relationships in pregnancy and newborn infants. Obstet Gynecol 50:701–705
Davis OK, Hawkins DS, Rubin LP, Posillico JT, Brown EM, Schiff I (1988) Serum parathyroid hormone (PTH) in pregnant women determined by an immunoradiometric assay for intact PTH. J Clin Endocrinol Metab 67:850–854
Frolich A, Rudnicki M, Fischer-Rasmussen W, Olofson K (1991) Serum concentrations of intact parathyroid hormone during late human pregnancy: a longitudinal study. Eur J Obstet Gynecol Reprod Biol 42:85–87
Allgrove J, Adami S, Manning RM, O'Riordan JLH, (1985) Cytochemical bioassay of parathyroid hormone in maternal and in cord blood. Arch Dis Child 60:110–115
Goltzman D, Stewart AF, Broadus AE (1981) Malignancy-associated hypercalcemia: evaluation with a cytochemical bioassay for parathyroid hormone. J Clin Endocrinol Metab 53: 899–904
Kao PC, Klee GG, Taylor RL, Heath H III (1990) Parathyroid hormone-related peptide in plasma of patients with hypercalcemia and malignant lesions. Mayo Clin Proc 65:1399–1407
Ratcliffe WA, Hutchesson ACJ, Bundred NJ, Ratcliffe JG (1992) Role of assays for parathyroid hormone-related protein in investigation of hypercalcemia. Lancet 339:164–167
Burtis WJ (1992) Parathyroid hormone-related protein: structure, function, and measurement. Clin Chem 38:2171–2183
Mallette LE (1991) The parathyroid polyhormones: new concepts in the spectrum of peptide hormone action Endocrinol Rev 12:110–117
Juppner H, Abou-Samra AB, Uneno S, Gu WX, Potts JT Jr, Segre GV (1988) The parathyroid hormone-like peptide associated with humoral hypercalcemia of malignancy and parathyroid hormone bind to the same receptor on the plasma membrane of ROS 17/2.8 cells. J Biol Chem 263:8557–8560
Nissenson RA, Diep D, Strewler GJ (1988) Synthetic peptides comprising the amino-terminal sequence of a parathyroid hormone-like protein from human malignancies. Binding to parathyroid hormone receptors and activation of adenylate cyclase in bone cells and kidney. J Biol Chem 263:12866–12871
Juppner H, Abou-Samra AB, Freeman M, et al. (1991) A G protein-linked receptor for parathyroid hormone and parathyroid hormone-related peptide. Science 254:1024–1026
Prechtl HFR (1980) The optimality concept. Early Hum Dev 4:211–215
Nelson N, Finnstrom O, Larsson L (1987) Neonatal reference values for ionized calcium, phosphate and magnesium: selection of reference population by optimality criteria. Scan J Clin Lab Invest 47:111–117
Bertelloni S, Baroncelli GI, Saggese G (1991) Parathyroid hormone-related peptide. Methodological evaluation of a new radioimmunoassay. Gior It Chim Clin 16:169–173
Payne RB, Little AJ, Williams RB, Milner JR (1973) Interpretations of serum calcium in patients with abnormal serum protein. Br Med J 4:643–646
Fisher JA (1986) The unique endocrine milieu of the fetus. J Clin Invest 78:603–611
Purdie DW, Aaron JE, Selby PL (1988) Bone histology and mineral homeostasis in human pregnancy. Br J Obstet Gynecol 95:849–854
Kumar R, Cohen WR, Silva P, et al. (1979) Elevated 1,25-dihydroxyvitamin D plasma levels in normal human pregnancy and lactation. J Clin Invest 63:342–344
Payne RB, Little AJ, Evans RT (1990) Albumin-adjusted calcium concentration in serum increases during normal pregnancy. Clin Chem 36:142–144
Singer FR (1990) Parathyroid hormone-related protein. Mayo Clin Proc 65:1502–1505
Khosla S, Johansen KL, Ory SJ, O'Brien PC, Kao PC (1990) Parathyroid hormone-related peptide in lactation and in umbilical cord blood. Mayo Clin Proc 65:1408–1414
Gillette ME, Insogna KL, Lewis AM, Baran DT (1982) Influence of pregnancy on immunoreactive parathyroid hormone levels. Calcif Tissue Int 34:9–12
Abbas SK, Pickard DW, Illigworth D, et al. (1990) Measurement of parathyroid hormone-related protein in extracts of fetal parathyroid glands and placental membranes. J. Endocrinol 124: 319–325
Ratcliffe WA, Thompson GE, Care AD, Peaker M (1992) Production of parathyroid hormone-related protein by mammary gland of the goat. J Endocrinol 133:87–93
Reid IR, Wattie DJ, Evans MC, Budayr AA (1992) Postpregnancy osteoporosis associated with hypercalcemia. Clin Endocrinol (Oxf) 37:298–303
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Bertelloni, S., Baroncelli, G.I., Pelletti, A. et al. Parathyroid hormone-related protein in healthy pregnant women. Calcif Tissue Int 54, 195–197 (1994). https://doi.org/10.1007/BF00301677
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00301677