Enhanced DNA vaccine potency by mannosylated lipoplex after intraperitoneal administration

The Journal of Gene Medicine
Yoshiyuki HattoriMitsuru Hashida

Abstract

Here we describe a novel DNA vaccine formulation that can enhance cytotoxic T lymphocyte (CTL) activity through efficient gene delivery to dendritic cells (DCs) by mannose receptor-mediated endocytosis. Ovalbumin (OVA) was selected as a model antigen for vaccination; accordingly, OVA-encoding pDNA (pCMV-OVA) was constructed to evaluate DNA vaccination. Mannosylated cationic liposomes (Man-liposomes) were prepared using cholesten-5-yloxy-N-{4-[(1-imino-2-D-thiomannosylethyl)amino]butyl}formamide (Man-C4-Chol) with cationic lipid. The potency of the mannosylated liposome/pCMV-OVA complex (Man-lipoplex) was evaluated by measuring OVA mRNA in CD11c+ cells, CTL activity, and the OVA-specific anti-tumor effect after in vivo administration. An in vitro study using DC2.4 cells demonstrated that Man-liposomes could transfect pCMV-OVA more efficiently than cationic liposomes via mannose receptor-mediated endocytosis. In vivo studies revealed that the Man-lipoplex exhibited higher OVA mRNA expression in CD11c+ cells in the spleen and peritoneal cavity and provided a stronger OVA-specific CTL response than intraperitoneal (i.p.) administration of the conventional lipoplex and intramuscular (i.m.) administration of naked pCMV-OVA, the stand...Continue Reading

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Citations

Sep 2, 2009·Biological & Pharmaceutical Bulletin·Kazumi NakamuraMitsuru Hashida
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