Identification and glycobiological characterization of circulating immune complexes in patients with visceral leishmaniasis and post kala azar dermal leishmaniasis.
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Date
2015-06
Journal Title
Journal ISSN
Volume Title
Publisher
NISCAIR-CSIR, India
Abstract
Here, we investigated the quantitative and qualitative differences in antibody classes and subclasses in serum immune complexes (ICs) of Visceral Leishmaniasis (VL), Post Kala-azar Dermal Leishmaniasis (PKDL) and different cross reactive diseases like Malaria, Leprosy, Vitiligo as compared to control subjects. IC levels were measured through a newly developed PEG ELISA, using L. donovani promastigote membrane antigen coated plate. Antibody classes and subclasses were identified using polyspecific sera and monoclonal antibodies, respectively. ICs were purified using polyethylene glycol (PEG) precipitation. Conditional logistic regression showed an association between IgG1-containing ICs and increased risk of PKDL (OR=75, P <0.05) and an association of IgG-containing ICs with VL (OR=621, P=0.001). PEG ELISA demonstrated almost 13-15 fold higher IgG containing ICs titers in VL as compared to control (P <0.001). The assay further established a significant (P <0.05) difference in the IgG containing ICs titers between VL and PKDL. The isolated ICs were further analyzed by subjecting them to one-dimensional PAGE and subsequently stained with combination of periodic acid schiff (PAS) with silver. A differential banding pattern between VL and PKDL was obtained. Four distinct bands with carbohydrate rich glycoconjugates were identified in PKDL ICs, which were absent in VL and control group. It suggests the scope for developing a novel differential diagnostic assay.
Description
Keywords
Black fever, Leishmania donovani, PEG-ELISA, Periodic acid schiff staining, Polyethylene glol
Citation
Datta Souvik, Modak Dolanchampa, Sarkar Somenath, Saha Bibhuti, Mukhopadhyay Sumi. Identification and glycobiological characterization of circulating immune complexes in patients with visceral leishmaniasis and post kala azar dermal leishmaniasis. Indian Journal of Experimental Biology. 2015 Jun; 53(6): 321-328.