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Early detection and visualization of human adenovirus serotype 5-viral vectors carrying foot-and-mouth disease virus or luciferase transgenes in cell lines and bovine tissues.

Abstract：

:Recombinant replication-defective human adenovirus type 5 (Ad5) vaccines containing capsid-coding regions from foot-and-mouth disease virus (FMDV) have been demonstrated to induce effective immune responses and provide homologous protective immunity against FMDV in cattle. However, basic mechanisms of Ad5-FMDV vaccine function including virus tropism, transgene expression, and antigen presentation, remain incompletely understood. The current study characterized the dynamics of Ad5 viral vector (Ad5-FMDV-A24 and Ad5-luciferase) infection in cell lines and early post-inoculation vector-host interactions in cattle. Adenovirus dissemination was described utilizing novel rPCR, rRT-PCR, luminometry, and immunomicroscopy techniques. In vitro infection of human and bovine cells with both Ad5 vectors resulted in dose-dependent detection of vector DNA, mature mRNA transcripts, and transgene-encoded proteins. Subsequent to intramuscular inoculation of cattle, Ad5 and transgene products were detected at the injection sites of all animals at all time-points examined (6, 24, and 48 hpi). Microscopically, injection sites were characterized by marked infiltrates of interstitium consisting of predominantly large mononuclear cells. Immunomicroscopy indicated these cells infrequently contained adenovirus and/or transgenic proteins and were phenotypically consistent with antigen-presenting cells (macrophages and dendritic cells). Vector DNA and mature mRNA transcripts were first detected at the draining and local lymph nodes as early as 6 hpi and systemically at 24 hpi. These results provide novel insights for understanding Ad5-mediated immunity against FMDV using novel techniques that will contribute to ongoing efforts for the improvement of future Ad-FMDV vaccine platforms.

journal_name

Vaccine

journal_title

Vaccine

authors

Montiel N,Smoliga G,Arzt J

doi

10.1016/j.vaccine.2011.12.082

subject

Has Abstract

pub_date

2012-02-21 00:00:00

pages

1690-701

issue

eissn

0264-410X

issn

1873-2518

pii

S0264-410X(11)02031-7

journal_volume

pub_type

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Early detection and visualization of human adenovirus serotype 5-viral vectors carrying foot-and-mouth disease virus or luciferase transgenes in cell lines and bovine tissues.