Monoclonal antibody for calcitriol (l α,25-dihydroxyvitamin d3)

Itaru Yamamoto, Eiji Matsuura

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10 Citations (Scopus)

Abstract

Hybridoma cell lines secreting antibodies for vitamin D3 metabolites have been generated by fusing splenocytes from BALB/c mice immunized with 3β-glutaryl-25-hydroxyvitamin Ds conjugated to bovine serum albumin (3β-glu-25-OH-Ds-BSA) and Sp2/O-Agl4 myeloma cells. Purification of monoclonal antibodies from culture media or ascites fluids was accomplished by procedures including affinity chromatog-raphy on Protein A-Sepharose 4B. Each monoclonal antibody was analyzed as to its affinity and specificity by equilibrium dialysis and an enzyme immunoassay (EIA) based on a double antibody system. It was demonstrated that clone 1C2-60 pro-duced an antibody highly specific to la,25-dihydroxyvitamin D3 (calcitriol), and the clone 2B3-66 antibody was reactive to 25-hydroxyvitamin D3 and similar structural compounds. These two monoclonal antibodies produced by 1C2-60 and 2B3-66 were determined to belong to the IgG2a class, and their affinity constants (Ka) with 3β-glu-25-OH-Ds were demonstrated to be 3.6×109M-1 and 2.9×109M-1, respectively, at 4°C. The characteristics of these monoclonal antibodies were compared with those of conventional antibodies raised in mice and rabbits. Finally, by using monoclonal antibody 1C2-60, a sensitive EIA has been developed that can detect 10 pg of calcitriol.

Original languageEnglish
Pages (from-to)991-998
Number of pages8
JournalJournal of biochemistry
Volume98
Issue number4
DOIs
Publication statusPublished - Oct 1985

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ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology

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