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Antibodies against 9-O-acetylated sialic acids in childhood acute lymphoblastic leukemia: a two-year study with 186 samples following protocol MCP 943. | LitMetric

AI Article Synopsis

Article Abstract

Initial studies have revealed an enhanced surface expression of 9-O-acetylated sialoglycoconjugates (9-OAcSGs) on lymphoblasts concomitant with high titers of antibodies (anti-9-OAcSGs) in childhood acute lymphoblastic leukemia (ALL). This study was undertaken in 186 coded samples from 69 ALL patients to evaluate if antibodies against these sialoglycans could monitor response to the treatment. An ELISA was developed using bovine submaxillary mucin (BSM) containing high % of 9-O-acetylated sialic acids (9-OAcSA) as the capture antigen, to investigate serum levels of anti 9-OAcSGs in a single-center series of pediatric, clinically-diagnosed and immunophenotypically confirmed ALL patients, as compared to 130 healthy controls. At presentation, a 3.8-fold increase in anti-9-OAcSGs levels was detected in 63/69 ALL patients (mean +/- SEM was 102.8 +/- 6.3 microg/ml) as compared to normal controls (27.17 +/- 0.76 microg/ml), assay sensitivity being 91.3%. On an individual basis (n = 25) in patients who were longitudinally monitored for two years, a significant decline in their mean +/- SEM of OD405 was observed from 0.85 +/- 0.06 to 0.28 +/- 0.03. Additionally, a dot-blot was developed to evaluate the proportion of immune-complexed 9-OAcSGs in these patients employing achatinin-H, a 9-OAcSA-binding lectin. Our data indicate that these economically viable ELISA-based approaches allow for reliable, sensitive and rapid diagnosis of ALL. We contend that these disease-specific antibodies could be considered as potential markers both for the initial diagnosis of ALL and possibly for longitudinal monitoring of the disease.

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