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M94A3046.TXT
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1994-10-25
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Document 3046
DOCN M94A3046
TI Heat versus acid dissociation of immune complexes for the detection of
P24 antigenemia.
DT 9412
AU Schechter M; Oliveira E; Pinto ME; Souza VM; Bronstein M; AIDS Program,
Federal University of Rio de Janeiro, Bronstein; Lab., Brazil.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):166 (abstract no. PB0089). Unique
Identifier : AIDSLINE ICA10/94369529
AB INTRODUCTION: P24 antigenemia is widely used as a surrogate marker of
disease progression and of therapeutic efficacy. Immune complex
dissociation has been shown to greatly increase the sensitivity of p24
detection assays and has become the standard technique. OBJECTIVE: To
compare heat (HD) versus acid (AD) dissociation of immune complexes in
p24 antigen capture assays. METHODS: Sera from HIV infected patients
previously known to be p24 negative by AD were assayed in parallel after
AD or HD, using the Coulter antigen kit. AD was performed using glycine
buffer followed by neutralization with Tris buffer. HD was accomplished
by diluting sera 1:3 in distilled water, followed by immersion of the
tubes in a boiling water bath for 5 minutes. The level of p24
antigenemia was quantified by comparing the optical density of reactive
samples to a standard curve of known positive specimens ran on the same
assay. RESULTS: Of the 39 samples tested, all remained negative by AD
and 3 (7.7%; .95 CI = 0-16%) became positive after HD. CONCLUSION: HD of
immune complexes is cheaper, easier to perform and far less
labour-intensive than AD. In addition, it may increase the sensitivity
of p24 antigen detection assays.
DE Antigen-Antibody Complex/*BLOOD AIDS Serodiagnosis/*METHODS
Comparative Study Human HIV Core Protein p24/*BLOOD HIV
Infections/*DIAGNOSIS/IMMUNOLOGY Predictive Value of Tests Support,
Non-U.S. Gov't MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).