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Well-defined and potent liposomal hepatitis B vaccines adjuvanted with lipophilic MDP derivatives

Jain, Vikas and Vyas, Suresh P. and Kohli, Dharmveer V. (2009) Well-defined and potent liposomal hepatitis B vaccines adjuvanted with lipophilic MDP derivatives. Nanomedicine: Nanotechnology, Biology and Medicine, 5 (3). 334 - 344.

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The characterization of immunological cascades of the innate immune system activated by invariant molecular structures termed as pathogen-associated molecular patterns recognized by pattern recognition receptors of macrophages and dendritic cells, have allowed the elucidation of the mechanisms underlying the immunomodulatory properties of adjuvants. Thus, adjuvant-active lipophilic analogues of N-acetyl muramyl dipeptide (MDP) were incorporated in liposomal hepatitis B surface antigen (HBsAg) formulations. The immunoreactivity of the formulations was evaluated by measuring anti-HBs, immunoglobulin G (IgG), and isotype antibody titer and compared with alum-adsorbed HBsAg formulation. The formulations were also evaluated for cell-mediated immune response by HBsAg-specific proliferation of splenocytes and simultaneous estimation of cytokines (interleukin-4 [IL-4], interferon-γ [IFN-γ]). Results indicate that the serum IgG and anti-HBs titer obtained after intramuscular administration of liposomal muramyl tripeptide–phosphatidylethanolamine (MTP-PE) and liposomal N-acetylmuramyl-l-alanyl-d-isoglutamine–glycerol dipalmitate (MDP-GDP) antigenic formulations were significantly higher. The incorporation of MTP-PE on the liposomal HBsAg increased the stimulation index (SI) four to five times as compared to plain HBsAg solution, and it also induced significantly higher Th1 cellular immune response with a predominant IFN-γ level. So it is the novel effective and potentially safe approach in which liposomes act as delivery vehicles for hepatitis B viral antigen to antigen-presenting cells and is ornamented with a biological response modifier that could activate these target cells to enhance the antigen presentation to T lymphocytes.

Item Type:Article
Uncontrolled Keywords:Targeted immunization; MTP-PE; Immunoliposomes
Subjects:Biomedical Science > Nanomedicine
ID Code:8597
Deposited By:SPI
Deposited On:25 Mar 2010 20:01
Last Modified:25 Mar 2010 20:01

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