Abstract:
:Oral, replication-competent Ad-HIV vaccines are advancing to human trials. Previous evaluation of protective efficacy in non-human primates has primarily followed upper respiratory tract administrations. Here we compared sequential oral (O/O) versus intranasal/oral (I/O) priming of rhesus macaques with Ad5 host range mutant-SIV recombinants expressing SIV env/rev, gag, and nef genes followed by boosting with SIV gp120 protein. Cellular immune responses in PBMC were stronger and more frequent after I/O administration. Both groups developed mucosal immunity, including memory cells in bronchial alveolar lavage, and gut-homing receptors on PBMC. Following intrarectal SIV(mac251) challenge, both groups exhibited equivalent, significant protection and robust post-challenge cellular immunity. Our results illustrate the promise of oral replication-competent Ad-recombinant vaccines. Pre-challenge PBMC ELISPOT and proliferative responses did not predict protection in the O/O group, highlighting the need for simple, non-invasive methods to reliably assess mucosal immunity.
journal_name
Vaccinejournal_title
Vaccineauthors
Zhou Q,Hidajat R,Peng B,Venzon D,Aldrich MK,Richardson E,Lee EM,Kalyanaraman VS,Grimes G,Gómez-Román VR,Summers LE,Malkevich N,Robert-Guroff Mdoi
10.1016/j.vaccine.2007.09.017subject
Has Abstractpub_date
2007-11-19 00:00:00pages
8021-35issue
47eissn
0264-410Xissn
1873-2518pii
S0264-410X(07)01039-0journal_volume
25pub_type
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