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. 1983 Oct 15;216(1):185–194. doi: 10.1042/bj2160185

A homogeneous immunoassay for cyclic nucleotides based on chemiluminescence energy transfer.

A K Campbell, A Patel
PMCID: PMC1152485  PMID: 6316935

Abstract

A chemiluminescent derivative of cyclic AMP, aminobutylethylisoluminol succinyl cyclic AMP (ABEI-scAMP), was synthesized in order to develop a homogeneous immunoassay based on non-radiative energy transfer. ABEI-scAMP was chemiluminescent (5.1 X 10(18) luminescent counts X mol-1 at pH 13), pure (greater than 95%) stable and immunologically active. A conventional immunoassay was established using ABEI-scAMP and a solid-phase anti-(cyclic AMP) immunoglobulin G which could detect cyclic AMP at least down to 25fmol. A homogeneous immunoassay for cyclic AMP was established by measuring the shift in wavelength from 460 to 525nm which occurred when ABEI-scAMP was bound to fluorescein-labelled anti-(cyclic AMP) immunoglobulin G. The assay was at least as sensitive as the conventional radioimmunoassay using cyclic [3H]AMP and could measure cyclic AMP over the range 1-1000nM. The homogeneous chemiluminescent energy transfer assay was also able to quantify the association and dissociation of antibody-antigen complexes. Chemiluminescence energy transfer occurred between fluorescein-labelled antibodies and several other ABEI-labelled antigens (Mr values 314-150000) including progesterone, cyclic GMP, complement component C9 and immunoglobulin G. The results provide a homogeneous immunoassay capable of measuring free cyclic AMP under conditions likely to exist inside cells.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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