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Journal of Virology, September 2005, p. 11170-11178, Vol. 79, No. 17
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.17.11170-11178.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Cross-Reactivity of T Lymphocytes Recognizing a Human Cytotoxic T-Lymphocyte Epitope within BK and JC Virus VP1 Polypeptides

Ludmila Krymskaya,1,{dagger} Madeva C. Sharma,1 Joy Martinez,1 Wahajul Haq,1 Eric C. Huang,1 Ajit P. Limaye,2 Don J. Diamond,1 and Simon F. Lacey1*

Laboratory of Vaccine Research, Beckman Institute of the City of Hope, 1500 East Duarte Road, Duarte, California 91010-3000,1 University of Washington Medical Center, 1579 N.E. Pacific Street, Seattle, Washington 98195-71102

Received 28 April 2005/ Accepted 16 June 2005

A transgenic mouse model was used to identify an HLA-A*02-restricted epitope within the VP1 polypeptide of a human polyomavirus, BK virus (BKV), which is associated with polyomavirus-associated nephropathy in kidney transplant patients. Peptide stimulation of splenocytes from mice immunized with recombinant modified vaccinia virus Ankara expressing BKV VP1 resulted in expansion of cytotoxic T lymphocytes (CTLs) recognizing the sequence LLMWEAVTV corresponding to amino acid residues 108 to 116 (BKV VP1p108). These effector T-cell populations represented functional CTLs as assessed by cytotoxicity and cytokine production and were cross-reactive against antigen-presenting cells pulsed with a peptide corresponding to the previously described JC virus (JCV) VP1 homolog sequence ILMWEAVTL (JCV VP1p100) (I. J. Koralnik et al., J. Immunol. 168:499-504, 2002). A panel of 10 healthy HLA-A*02 human volunteers and two kidney transplant recipients were screened for T-cell immunity to this BK virus VP1 epitope by in vitro stimulation of their peripheral blood mononuclear cells (PBMC) with the BKV VP1p108 peptide, followed by tetramer labeling combined with simultaneous assays to detect intracellular cytokine production and degranulation. PBMC from 4/10 subjects harbored CTL populations that recognized both the BKV VP1p108 and the JCV VP1p100 peptides with comparable efficiencies as measured by tetramer binding, gamma interferon production, and degranulation. CTL responses to the JCV VP1p100 epitope have been associated with prolonged survival in progressive multifocal leukoencephalopathy patients (R. A. Du Pasquier et al., Brain 127:1970-1978, 2004; I. J. Koralnik et al., J. Immunol. 168:499-504, 2002). Given that both human polyomaviruses are resident in a high proportion of healthy individuals and that coinfection occurs (W. A. Knowles et al., J. Med. Virol. 71:115-123, 2003), our findings suggest a reinterpretation of this protective T-cell immunity, suggesting that the same VP1 epitope is recognized in HLA-A*02 persons in response to either BK or JC virus infection.

* Corresponding author. Mailing address: Room 1001C, Fox South Bldg., Laboratory of Vaccine Research, Beckman Research Institute of the City of Hope, 1500 East Duarte Road, Duarte, CA 91010-3000. Phone: (626) 359-8111. Fax: (626) 301-8981. E-mail: slacey{at}coh.org.

{dagger} Present address: Mannkind Corporation, 28903 North Avenue Paine, Valencia, CA 91355.

Journal of Virology, September 2005, p. 11170-11178, Vol. 79, No. 17
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.17.11170-11178.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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