Open AccessRadioimmunoassay of Insect Juvenile Hormones and of Their Diol Derivatives
Author(s) -
STRAMBI Colette,
STRAMBI Alain,
REGGI Max L.,
HIRN Michel H.,
DELAAGE Michel A.
Publication year - 1981
Publication title -
european journal of biochemistry
Language(s) - English
Resource type - Journals
eISSN - 1432-1033
pISSN - 0014-2956
DOI - 10.1111/j.1432-1033.1981.tb06416.x
Subject(s) - radioimmunoassay , juvenile hormone , antiserum , corpus allatum , hemolymph , hormone , titer , diol , chromatography , chemistry , peptide hormone , antibody , biology , endocrinology , biochemistry , immunology , organic chemistry
We have developed a radioimmunoassay for insect juvenile hormones. The C 18 hormone (JH I) was first converted into diol by opening the 10,11‐epoxy ring. Diol was then succinylated and coupled to human serum albumin to make it immunogenic. High titer antisera were obtained from immunized rabbits. Succinyl juvenile hormone was also coupled to the peptide glycyltyrosine and iodinated so as to form a water‐soluble 125 I‐labelled analogue well recognized by antibodies (60% bound by the 1/2 dilution of antiserum routinely used in radioimmunoassay). Standards and biological samples were treated with acidic dioxane in order to convert each hormone into its corresponding diol. In this way, the sensitivity threshold of the radioimmunoassay was under 0.015 pmol. All three diols were equally recognized by the antibodies. Hormones JH I, JH II and JH III could be assayed separately as diols after thin‐layer chromatography or high‐pressure liquid chromatography purification of the biological samples. This method was used to determine physiological levels of juvenile hormones in the haemolymph of several insects at different developmental stages including embryos and in corpora allata cultures.