Osteocalcin production in vivo and in vitro after 1,25-dihydroxycholecalciferol stimulation comparison of different assays

Isabella Villa, Giuseppe Banfi, Rita Daverio, Giuseppina Resmini, Alessandro Rubinacci

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The study was designed to assess the sensitivity of three commercial assays (which differ in methodology, standard and antibodies) for osteocalcin, used for detecting changes in osteocalcin secretion induced by calcitriol (1,25-dihydroxycholecalciferol) in vivo and in vitro. Osteocalcin levels were determined in serum samples of 10 osteoporotic women after short term calcitriol treatment, and in the culture medium of human osteoblast-like cells (n = 22) after 48 h calcitriol exposure. All assays displayed similar sensitivity in detecting osteocalcin production in vivo after a 1 μg daily dose of calcitriol. A novel IRMA (CIS), claimed to detect intact osteocalcin, showed higher osteocalcin values than the other assays, and in vitro showed the best sensitivity; it provides an appropriate index of the osteocalcin synthetic activity of cultured human osteoblasts.

Original languageEnglish
Pages (from-to)771-775
Number of pages5
JournalEuropean Journal of Clinical Chemistry and Clinical Biochemistry
Issue number9
Publication statusPublished - 1996


ASJC Scopus subject areas

  • Clinical Biochemistry

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