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Title: Evaluation of immune responses directed against 30kDa secretory protein of Mycobacterium tuberculosis H37Ra complexed in different adjuvants
Authors: Yadav, Deepak
Khuller, G K
Issue Date: Dec-2001
Publisher: NISCAIR-CSIR, India
Abstract: Ability of different adjuvants to promote cell mediated immune responses towards 30kDa secretory protein of Mycobacterium tuberculosis H37Ra was monitored by assessing the lymphocyte proliferation and IgG IngG2a subclass profile in mouse model. Six formulations, viz. poly lactide-co-glycolide (PLG) microspheres, dimethyldioctadecyl ammoniumbromide (DDA), liposomes, liposomes containing monophosphoryllipid A and coated with alum (L-LIPA-AL) or without alum (L-LIPA) were evaluated in comparison to standard Freund's incomplete adjuvant (FIA). Two adjuvant formulations of 30kDa-L-LIPA-AL and 30kDa-PLG showed maximum reactivity on VIIIth week post immunization ( in terms of lymphoproliferation w.r.t. other adjuvant formulations. Both the vaccine formulations also exhibited a Thl shift in terms of higher IgG2a response over IgG1. Flowcytometric analysis in the mesenteric lymph nodes (MLNs) of immunized animals revealed the capacity of 30kDa-PLG and 30kDa-L-LIPA-AL to activate T cell subsets like CD4 and CD8 T cells. The upregulation of B7 costimulatory molecules (B7-l & B7-2) after immunization further proved the ability of the two vaccine formulations to activate antigen presenting cells. The immunostimulatory nature of the two formulations was also reflected in their capacity to reduce the bacilli load from the lungs of the experimentally infected mice. This study demonstrates PLG and L-LIPA-AL as potent adjuvants and their bioacceptibility and nontoxic nature make them suitable candidates for future subunit vaccine development against tuberculosis.
Page(s): 1227-1234
ISSN: 0975-1009 (Online); 0019-5189 (Print)
Appears in Collections:IJEB Vol.39(12) [December 2001]

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