Densitometric Analysis of Western Blot (immunoblot) Assays for Human Immunodeficiency Virus Antibodies and Correlation with Clinical Status

Overview

Journal J Clin Microbiol

Specialty Microbiology

Date 1987 Oct 1

PMID 2444624

Citations 10

Authors

G Schmidt

K AMIRAIAN

H Frey

R W Stevens

D S Berns

Affiliations

Soon will be listed here.

Abstract

Western blot assays for antibodies directed against components of human immunodeficiency virus (HIV) associated with acquired immunodeficiency syndrome (AIDS) were examined with a densitometer and integrator. Antibody responses to seven HIV proteins were determined from the areas under the peaks of bands on blots from 430 seropositive individuals. Antibody responses corresponded qualitatively and quantitatively with clinical status. The Western blot assays examined were done on single specimens from individuals in one of four clinical states: asymptomatic with no risk factor identified, asymptomatic with risk factor(s) identified, AIDS-related complex, and AIDS. The ratios of gp41 antibody to p24 antibody and of gp41 antibody to total HIV antibodies increased, and the number of total HIV antibodies decreased progressively in these populations. Parameters were assigned to characterize the typical response found in AIDS: gp41 antibody/p24 antibody ratio, greater than or equal to 2.0; gp41 antibody/total HIV antibodies ratio, greater than or equal to 0.30; and number of total HIV antibodies, less than or equal to 25.0 signal units. Parameter match increased with progression of clinical status. These parameters were applied in a brief follow-up study of 34 HIV-infected asymptomatic individuals who developed AIDS-related complex or AIDS. Initial specimens showed a stronger correlation than our population data base had predicted, suggesting that the parameters have prognostic value. Densitometric analysis of antibody responses on Western blot assays of single or serial specimens should prove useful to physicians in staging and monitoring HIV-infected individuals and in predicting which individuals will progress to AIDS.

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