Development and clinical application of an immunoflurometric assay for intact parathyroid hormone
Braz. j. med. biol. res
; 27(10): 2379-82, Oct. 1994. ilus
Article
en En
| LILACS
| ID: lil-152617
Biblioteca responsable:
BR1.1
RESUMO
Parathyroid hormone (PTH) is a linear peptide of 84 amino acids that is found in serum mainly in the form of carboxyl-terminal fragments. The biological activity of PTH depends on the presence of the amino-terminal portion and in circulation is limited to the intact molecule. We describe an immunmofluorometric assay for the measurement of PTH-(1-84) based on a chicken egg yolk-derived amino-terminal antibody bound to microtiter plates by an anti-chicken Ig monoclonal antibody. As tracer antibody we employed a Europium-labelled carboxyl-terminal specific monoclonal antibody produced from a mouse immunized with hPTH-(53-84)-BSA conjugate. The assayincluded an initial overnight incubation of the sample and the solid phase-bound amino-terminal antibody, followed by washing and addition of the tracer antibody, and an additional two hours of incubation prior to fluorescence reading. The least-detectable dose was in the order of 2.5 pg/.ml and preliminary studies in 40 normal adults showed values in the range of 4 to 70 pg/ml; fo 12 patients with surgery-proven primary hyperparathyroidism values ranged from 109 to 743 pg/ml and for 34 patients with humoral hypercalcemia of malignancy from 2.5 to 66 pg/ml. We conclude that this assay, with its increased sensitivity and specificity, will be a valuable tool in the study of PTH secretion in normal and pathological situations
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Colección:
01-internacional
Base de datos:
LILACS
Asunto principal:
Hormona Paratiroidea
/
Fluoroinmunoensayo
Tipo de estudio:
Diagnostic_studies
Límite:
Humans
Idioma:
En
Revista:
Braz. j. med. biol. res
Asunto de la revista:
BIOLOGIA
/
MEDICINA
Año:
1994
Tipo del documento:
Article