Parathyroid hormone/parathyroid hormone-related peptide type 1 receptor in human bone

M. Chris Langub, Marie Claude Monier-Faugere, Quanle Qi, Z. Geng, Nicholas J. Koszewski, Hartmut H. Malluche

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

The parathyroid hormone/parathyroid hormone-related peptide (PTH/PTHrP) receptor (denoted as PTH-IR) is a key signaling factor through which calcium-regulating hormones PTH and PTHrP exert their effects on bone. There are contradictory reports regarding the capability of osteoclasts to express PTH-1R. To address this issue in humans, bone biopsy specimen samples from 9 normal controls and 16 patients with moderate to severe secondary renal hyperparathyroid bone disease (2°HPT) with elevated PTH levels were studied to determine whether osteoclasts in the bone microenvironment express PTH-1R messenger RNA (mRNA) and protein. We report that osteoclasts express the PTH-1R mRNA but the protein is detected only in patients with 2°HPT. The PTH-1R mRNA and protein also were found in osteoblasts, osteocytes, and bone marrow cells. Receptor expression was higher in osteoclasts and osteoblasts of patients with 2°HPT than normal controls (98.0 ± 1.1% vs. 65.7 ± 14.3% and 65.8 ± 3.4% vs. 39.1 ± 6.2%; p < 0.01, respectively). Approximately half of osteoclasts found in bone of patients with 2°HPT have the PTH-1R protein. In patients with 2°HPT, a positive relationship exists between erosion depth, a parameter of osteoclastic activity, and the percentage of osteoclasts with PTH-1R protein (r = 0.58; p < 0.65). In normal controls, an inverse relationship exists between the percentage of osteoblasts with receptor mRNA, mRNA signals/cell, and serum PTH levels (r = -0.82 and p < 0.05 and r = -0.73 and p < 0.01, respectively). The results provide the novel evidence of PTH-1R in human osteoclasts and suggest a functional role for the receptors in 2°HPT.

Original languageEnglish
Pages (from-to)448-456
Number of pages9
JournalJournal of Bone and Mineral Research
Volume16
Issue number3
DOIs
StatePublished - 2001

Keywords

  • Immunohistochemistry, mineralized bone histology
  • In situ hybridization histochemistry
  • Osteoblast
  • Secondary hyperparathyroidism

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Orthopedics and Sports Medicine

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