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In vivo protein expression and immune responses generated by DNA vaccines expressing mycobacterial antigens fused with a reporter protein.

Abstract：

:We cloned six mycobacterial antigens into a mammalian expression vector as fusion proteins with the enhanced green fluorescent protein (EGFP). Plasmid DNA was injected intramuscularly, and the injection sites were examined 1 week later. Expression of each antigen-EGFP fusion protein was visualized as green fluorescence in muscle tissue sections. A plasmid expressing EGFP alone and a plasmid with a frameshift mutation served as positive and negative controls. Visualization of fluorescent protein in vivo was 100% specific when compared to in vitro results. In vivo sensitivity was only 37% based on individual injection sites, but increased to 100% when results from multiple injection sites were combined for each plasmid. EGFP alone was expressed in a higher proportion of myocytes than the antigen-EGFP fusion proteins (P < 0.001). There was a trend toward an inverse correlation between protein size and the proportion of myocytes with visible fluorescence (r = -0.68; P = 0.09). We compared antibody subtypes generated to Mycobacterium bovis antigen 85A, when it was expressed alone or as a fusion protein. Inclusion of EGFP modified the immune response toward a Th1 response, as indicated by the ratio of antigen 85A-specific IgG2a to IgG1 generated by each plasmid (antigen 85A alone 0.73 +/- 0.18 versus antigen 85A-EGFP 1.82 +/- 0.57, mean +/- S.D.; P < 0.01), though the magnitude of the antibody isotype shift was modest. Direct visualization of antigen-EGFP fusion proteins provided a simple and rapid method to confirm in vivo antigen expression.

journal_name

Vaccine

journal_title

Vaccine

authors

Quinn A,Jiang W,Velaz-Faircloth M,Cobb AJ,Henry SC,Frothingham R

doi

10.1016/s0264-410x(02)00253-0

subject

Has Abstract

pub_date

2002-08-19 00:00:00

pages

3187-92

issue

25-26

eissn

0264-410X

issn

1873-2518

pii

S0264410X02002530

journal_volume

20

pub_type

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