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Journal of Virology, August 2002, p. 7942-7948, Vol. 76, No. 16
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.16.7942-7948.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Novel Role of CD8+ T Cells and Major Histocompatibility Complex Class I Genes in the Generation of Protective CD4+ Th1 Responses during Retrovirus Infection in Mice

Karin E. Peterson, Ingunn Stromnes, Ron Messer, Kim Hasenkrug, and Bruce Chesebro*

Laboratory of Persistent Viral Diseases, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana 59840

Received 7 March 2002/ Accepted 24 April 2002

CD4+ Th1 responses to virus infections are often necessary for the development and maintenance of virus-specific CD8+ T-cell responses. However, in the present study with Friend murine retrovirus (FV), the reverse was also found to be true. In the absence of a responder H-2b allele at major histocompatibility complex (MHC) class II loci, a single H-2Db MHC class I allele was sufficient for the development of a CD4+ Th1 response to FV. This effect of H-2Db on CD4+ T-cell responses was dependent on CD8+ T cells, as demonstrated by depletion studies. A direct effect of CD8+ T-cell help in the development of CD4+ Th1 responses to FV was also shown in vaccine studies. Vaccination of nonresponder H-2a/a mice induced FV-specific responses of H-2Dd-restricted CD8+ cytotoxic T lymphocytes (CTL). Adoptive transfer of vaccine-primed CD8+ T cells to naive H-2a/a mice prior to infection resulted in the generation of FV-specific CD4+ Th1 responses. This novel helper effect of CD8+ T cells could be an important mechanism in the development of CD4+ Th1 responses following vaccinations that induce CD8+ CTL responses. The ability of MHC class I genes to facilitate CD4+ Th1 development could also be considerable evolutionary advantage by allowing a wider variety of MHC genotypes to generate protective immune responses against intracellular pathogens.


* Corresponding author. Mailing address: Rocky Mountain Laboratories, 903 S. 4th St., Hamilton, MT 59840. Phone: (406) 363-9354. Fax: (406) 363-9286. E-mail: bchesebro{at}nih.gov.


Journal of Virology, August 2002, p. 7942-7948, Vol. 76, No. 16
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.16.7942-7948.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.




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