Purification, characterization of O-acetylated sialoglycoconjugates-specific IgM, and development of an enzyme-linked immunosorbent assay for diagnosis and follow-up of indian visceral leishmaniasis patients

Diagnostic Microbiology and Infectious Disease
Sumi BandyopadhyayChitra Mandal

Abstract

The surface expression of 9-O-acetylated sialic acid (9-OAcSA) is elevated on hematopoietic cells and erythrocytes of visceral leishmaniasis (VL) patients. In this study, we show that VL patients contain elevated levels of IgM antibodies directed against 9-O-acetylated sialoglycoconjugates (9-OAcSG). These antibodies were affinity purified with bovine submaxillary protein as the affinity matrix containing the terminal epitope, 9-OAcSAalpha2-6GalNAc. They also bound to 9-OAcSGs on hematopoietic cells of patients with VL and to epitopes in the cytosol of Leishmania donovani promastigotes. A novel enzyme-linked immunosorbent assay was employed that showed 4-fold higher anti-OAcSG titers in VL patients (n=38), mean +/- S.E.M. being 0.83 +/- 0.09 vs. 0.21 +/- 0.04 detected in normal donors (n=20) and patients with cross-reactive diseases such as malaria (n=4) or tuberculosis (n=4). Assay specificity and sensitivity was 100% and 92%, respectively, whereas positive and negative predictive values were 100% and 90%, respectively. Significantly, anti-OAcSG titers declined 30 days after completion of anti-leishmanial treatment, indicating that monitoring of anti-9-OAcSGs may be a valuable alternative toward increasing the efficiency of di...Continue Reading

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Citations

Nov 9, 2011·Parasitology Research·Gurumurthy SrividyaPoonam Salotra
Oct 7, 2006·BMJ : British Medical Journal·Diana N J Lockwood, Shyam Sundar
Jul 28, 2015·Expert Review of Anti-infective Therapy·Paul Torpiano, David Pace
Nov 5, 2014·Antimicrobial Agents and Chemotherapy·Anke E KipThomas P C Dorlo
Jul 23, 2013·International Journal of Pharmaceutics·T T H PhamG Barratt
May 1, 2009·Clinical and Vaccine Immunology : CVI·Angana GhoshalChitra Mandal
Jun 13, 2020·Frontiers in Cellular and Infection Microbiology·Priyank JaiswalSumi Mukhopadhyay

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