A new approach for development of vaccine against visceral leishmaniasis: lipophosphoglycan and polyacrylic acid conjugates

Publication date: Available online 15 September 2017
Source:Asian Pacific Journal of Tropical Medicine
Author(s): Adil M. Allahverdiyev, Rabia Cakir Koc, Melahat Bagirova, Serhat Elcicek, Serap Yesilkir Baydar, Olga Nehir Oztel, Emrah Sefik Abamor, Sezen Canim Ates, Murat Topuzogullari, Sevil Isoglu Dincer, Zeynep Akdeste
ObjectiveTo determine the antileishmanial vaccine effectiveness of lipophosphoglycan (LPG) and polyacrylic acids (PAA) conjugates on in vivo mice models.MethodsLPG molecule was isolated and purified from large-scale Leishmania donovani parasite culture. Protection efficacies of LPG alone, in combination with Freund's adjuvant, in a physical mixture and in conjugate (consisting of various LPG concentrations) with PAA, were comparatively determined by various techniques, such as cultivation with the micro-culture method, assessment of in vitro infection rates of peritoneal macrophages, determination of parasite load in liver with Leishman-Donovan Units (LDU), and detection of cytokine responses.ResultsObtained results demonstrated that the highest vaccine-mediated immune protection was provided by LPG-PAA conjugate due to all parameters investigated. According to the LDU results, the sharpest decline in parasite load was seen with a ratio of 81.17% when 35 μg LPG containing conjugate was applied. This value was 44.93% for the control group immunized only with LPG. Moreover, decreases in parasite load were 53.37%, 55.2% and 65.8% for the groups immunized with 10 μg LPG containing LPG-PAA conjugate, a physical mixture of the LPG–PAA, and a mixture of LPG + Freund's adjuvant, respectively. Furthermore, cytokine results supported that Th1 mediated protection occurred when mice were immunized with LPG-PAA conjugate.ConclusionsIt has been demonstrated in this study that conjugate of LPG and PAA has an antileishmanial vaccine effect against visceral leishmaniasis. In this respect, the present study may lead to new vaccine approaches based on high immunogenic LPG molecule and adjuvant polymers in fighting against Leishmania infection.



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