The abnormal phenotypes of cartilage and bone in calcium-sensing receptor deficient mice are dependent on the actions of calcium, phosphorus, and PTH.

Abstract:

:Patients with neonatal severe hyperparathyroidism (NSHPT) are homozygous for the calcium-sensing receptor (CaR) mutation and have very high circulating PTH, abundant parathyroid hyperplasia, and severe life-threatening hypercalcemia. Mice with homozygous deletion of CaR mimic the syndrome of NSHPT. To determine effects of CaR deficiency on skeletal development and interactions between CaR and 1,25(OH)(2)D(3) or PTH on calcium and skeletal homeostasis, we compared the skeletal phenotypes of homozygous CaR-deficient (CaR(-/-)) mice to those of double homozygous CaR- and 1α(OH)ase-deficient [CaR(-/-)1α(OH)ase(-/-)] mice or those of double homozygous CaR- and PTH-deficient [CaR(-/-)PTH(-/-)] mice at 2 weeks of age. Compared to wild-type littermates, CaR(-/-) mice had hypercalcemia, hypophosphatemia, hyperparathyroidism, and severe skeletal growth retardation. Chondrocyte proliferation and PTHrP expression in growth plates were reduced significantly, whereas trabecular volume, osteoblast number, osteocalcin-positive areas, expression of the ALP, type I collagen, osteocalcin genes, and serum ALP levels were increased significantly. Deletion of 1α(OH)ase in CaR(-/-) mice resulted in a longer lifespan, normocalcemia, lower serum phosphorus, greater elevation in PTH, slight improvement in skeletal growth with increased chondrocyte proliferation and PTHrP expression, and further increases in indices of osteoblastic bone formation. Deletion of PTH in CaR(-/-) mice resulted in rescue of early lethality, normocalcemia, increased serum phosphorus, undetectable serum PTH, normalization in skeletal growth with normal chondrocyte proliferation and enhanced PTHrP expression, and dramatic decreases in indices of osteoblastic bone formation. Our results indicate that reductions in hypercalcemia play a critical role in preventing the early lethality of CaR(-/-) mice and that defects in endochondral bone formation in CaR(-/-) mice result from effects of the marked elevation in serum calcium concentration and the decreases in serum phosphorus concentration and skeletal PTHrP levels, whereas the increased osteoblastic bone formation results from direct effects of PTH.

journal_name

PLoS Genet

journal_title

PLoS genetics

authors

Liu J,Lv F,Sun W,Tao C,Ding G,Karaplis A,Brown E,Goltzman D,Miao D

doi

10.1371/journal.pgen.1002294

subject

Has Abstract

pub_date

2011-09-01 00:00:00

pages

e1002294

issue

9

eissn

1553-7390

issn

1553-7404

pii

PGENETICS-D-11-00733

journal_volume

7

pub_type

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