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2017 ; 48
(1
): 37
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Bacterial ghosts as adjuvants: mechanisms and potential
#MMPMID28645300
Hajam IA
; Dar PA
; Won G
; Lee JH
Vet Res
2017[Jun]; 48
(1
): 37
PMID28645300
show ga
Bacterial ghosts (BG) are empty cell envelopes derived from Gram-negative
bacteria. They contain many innate immunostimulatory agonists, and are potent
activators of a broad range of cell types involved in innate and adaptive
immunity. Several considerable studies have demonstrated the effectiveness of BG
as adjuvants as well as their ability to induce proinflammatory cytokine
production by a range of immune and non-immune cell types. These proinflammatory
cytokines trigger a generalized recruitment of T and B lymphocytes to lymph nodes
that maximize the chances of encounter with their cognate antigen, and subsequent
elicitation of potent immune responses. The plasticity of BG has allowed for the
generation of envelope-bound foreign antigens in immunologically active forms
that have proven to be effective vaccines in animal models. Besides their
adjuvant property, BG also effectively deliver DNA-encoded antigens to dendritic
cells, thereby leading to high transfection efficiencies, which subsequently
result in higher gene expressions and improved immunogenicity of DNA-based
vaccines. In this review, we summarize our understanding of BG interactions with
the host immune system, their exploitation as an adjuvant and a delivery system,
and address important areas of future research interest.