1
|
Rosati M, Alicea C, Kulkarni V, Virnik K, Hockenbury M, Sardesai NY, Pavlakis GN, Valentin A, Berkower I, Felber BK. Recombinant rubella vectors elicit SIV Gag-specific T cell responses with cytotoxic potential in rhesus macaques. Vaccine 2015; 33:2167-74. [PMID: 25802183 DOI: 10.1016/j.vaccine.2015.02.067] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2014] [Revised: 02/19/2015] [Accepted: 02/25/2015] [Indexed: 11/25/2022]
Abstract
Live-attenuated rubella vaccine strain RA27/3 has been demonstrated to be safe and immunogenic in millions of children. The vaccine strain was used to insert SIV gag sequences and the resulting rubella vectors were tested in rhesus macaques alone and together with SIV gag DNA in different vaccine prime-boost combinations. We previously reported that such rubella vectors induce robust and durable SIV-specific humoral immune responses in macaques. Here, we report that recombinant rubella vectors elicit robust de novo SIV-specific cellular immune responses detectable for >10 months even after a single vaccination. The antigen-specific responses induced by the rubella vector include central and effector memory CD4(+) and CD8(+) T cells with cytotoxic potential. Rubella vectors can be administered repeatedly even after vaccination with the rubella vaccine strain RA27/3. Vaccine regimens including rubella vector and SIV gag DNA in different prime-boost combinations resulted in robust long-lasting cellular responses with significant increase of cellular responses upon boost. Rubella vectors provide a potent platform for inducing HIV-specific immunity that can be combined with DNA in a prime-boost regimen to elicit durable cellular immunity.
Collapse
Affiliation(s)
- Margherita Rosati
- Human Retrovirus Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD, USA
| | - Candido Alicea
- Human Retrovirus Pathogenesis Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD, USA
| | - Viraj Kulkarni
- Human Retrovirus Pathogenesis Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD, USA
| | - Konstantin Virnik
- Laboratory of Immunoregulation, Division of Viral Products, Office of Vaccines, Center for Biologics, FDA, Silver Spring, MD, USA
| | - Max Hockenbury
- Laboratory of Immunoregulation, Division of Viral Products, Office of Vaccines, Center for Biologics, FDA, Silver Spring, MD, USA
| | | | - George N Pavlakis
- Human Retrovirus Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD, USA
| | - Antonio Valentin
- Human Retrovirus Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD, USA
| | - Ira Berkower
- Laboratory of Immunoregulation, Division of Viral Products, Office of Vaccines, Center for Biologics, FDA, Silver Spring, MD, USA.
| | - Barbara K Felber
- Human Retrovirus Pathogenesis Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD, USA.
| |
Collapse
|