title: An immunoradiometric assay for thymosin alpha 1.
abstract: An Immunoradiometric assay for thymosin alpha 1(1-28) was developed using a monoclonal and a polyclonal antiserum which were raised against synthetic thymosin alpha 1(1-28) and thymosin alpha 1(16-28), respectively. A monoclonal antibody, specific for the (acetylated ser1) 1-5 sequence of thymosin alpha 1, was immobilized on polystyrene beads for the solid phase, and a polyclonal antiserum specific for the 16-28 sequence was employed. This method relies on the formation of an immune complex consisting of a 125I-labelled anti-rabbit IgG goat antibody, polyclonal antiserum, thymosin alpha 1, and the solid phase monoclonal antibody. Radioactivity on the solid phase is directly proportional to the amount of thymosin alpha 1 present in the specimen. The minimal detection limit of this assay system was approximately 1.9 pg/ml. The mean values of thymosin alpha 1 in plasma of healthy subject, ranging in age from 0 to 3 years was approximately five fold higher than that of higher ages. HPLC analysis of plasma of a healthy subjects revealed a single immunoreactive form which eluted with the same retention time as that of synthetic thymosin alpha 1. This assay will be extremely useful for the measurement of thymosin alpha 1 in biologic fluids and tissues.
authors.affiliation: Research & Development Center, Yuka Medias Co., Ltd, Inashiki Ibaraki, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yokoi
authors.forename: T
authors.initials: T
authors.lastname: Saitoh
authors.forename: Y
authors.initials: Y
authors.lastname: Nakazawa
authors.forename: H
authors.initials: H
authors.lastname: Ohno
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D000918:Antibody Specificity; D001826:Body Fluids / Q000737:chemistry; D002675:Child, Preschool; D005260:Female; D006041:Goats; D006801:Humans; D015592:Immunoradiometric Assay; D007223:Infant; D007231:Infant, Newborn; D051379:Mice; D008807:Mice, Inbred BALB C; D010446:Peptide Fragments / Q000138:chemical synthesis / Q000276:immunology; D011817:Rabbits; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D000077596:Thymalfasin; D013947:Thymosin / Q000031:analogs & derivatives* / Q000032:analysis / Q000097:blood / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D010446:Peptide Fragments; D013947:Thymosin; D000077596:Thymalfasin