Vitamin D3-resistant fibroblasts have immunoassayable 1,25-dihydroxyvitamin D3 receptors

J. Wesley Pike, Shigeharu Dokoh, Mark R. Haussler, Uri A. Liberman, Stephen J. Marx, E. I.L. Charles

Research output: Contribution to journalArticlepeer-review

50 Scopus citations


Cultured fibroblasts obtained from patients with tissue resistance to 1,25-dihydroxyvitamin D3 (vitamin D3-dependent rickets, type II) contain normal, low, or undetectable concentrations of this hormone's receptor protein as measured by a ligand-binding assay. Extracts from these cells were evaluated for receptors by immunoassay with a recently developed monoclonal antibody to the chick receptor. The results show that a protein sedimenting at 3.7S and recognizable by the antibody exists in comparable concentrations in cells from both normal and resistant patients, irrespective of the hormone-binding abnormalities of the cells. This implies that deficiencies in hormone binding associated with inherited tissue resistance to 1,25-dihydroxyvitamin D3 probably arise from structural variations in the receptor molecule and not from defective receptor synthesis.

Original languageEnglish (US)
Pages (from-to)879-881
Number of pages3
Issue number4648
StatePublished - 1984

ASJC Scopus subject areas

  • General


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