title: A novel two-site enzyme immunoassay for the sensitive detection of beta-endorphin in specific human brain stem regions.
abstract: On the line of experiences previously made in the development of a two-site immunoradiometric assay (TS-IRMA), we generated, in the present study, a novel, sequential, noncompetitive two-site immunoenzymometric assay (TS-IEMA) for the determination of the non-acetylated form of human beta-endorphin (beta h-EP). At variance with other assays reported in the literature, but in analogy to the TS-IRMA, the TS-IEMA does not require previous separation of beta h-EP. The TS-IEMA detects beta h-EP in central nervous tissues at a very low detection limit, and to a high degree of reproducibility, precision, sensitivity, and accuracy. The newly developed assay was then used to determine beta h-EP levels in the tissues of distinct brainstem regions. Tissues were collected, by the Palkovits's punching technique, from a series of victims of "Sudden Infant Death Syndrome" and of miscellaneous infections. The TS-IEMA, combined with the punching technique, has revealed, in the measure of its application in the present study, an unprecedented high degree of resolution of the neurochemical architecture of beta h-EP in the human infantile brainstem.
authors.affiliation: Endorphin Laboratories, University of Zürich, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Pasi
authors.forename: N
authors.initials: N
authors.lastname: Lansel
authors.forename: H
authors.initials: H
authors.lastname: Mahler
authors.forename: W
authors.initials: W
authors.lastname: Bär
authors.forename: F S
authors.initials: FS
authors.lastname: Messiha
mesh_terms: D001933:Brain Stem / Q000737:chemistry*; D005069:Evaluation Studies as Topic; D006801:Humans; D007124:Immunoenzyme Techniques / Q000592:standards / Q000706:statistics & numerical data; D007223:Infant; D007239:Infections / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D012015:Reference Standards; D012680:Sensitivity and Specificity; D013398:Sudden Infant Death / Q000209:etiology; D014018:Tissue Distribution; D001615:beta-Endorphin / Q000032:analysis* / Q000592:standards
chemical_list: D001615:beta-Endorphin