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Journal of Virology, July 1999, p. 5402-5410, Vol. 73, No. 7
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Induction of Human Papillomavirus-Specific CD4+ and CD8+ Lymphocytes by E7-Pulsed Autologous Dendritic Cells in Patients with Human Papillomavirus Type 16- and 18-Positive Cervical Cancer

Alessandro D. Santin,1,2,* Paul L. Hermonat,1 Antonella Ravaggi,1,2 Maurizio Chiriva-Internati,1,2 Dejin Zhan,1 Sergio Pecorelli,2 Groesbeck P. Parham,1 and Martin J. Cannon3

Division of Gynecologic Oncology, Department of Obstetrics and Gynecology,1 and Department of Microbiology and Immunology,3 University of Arkansas, Little Rock, Arkansas, and Division of Gynecologic Oncology, University of Brescia, Brescia, Italy2

Received 8 December 1998/Accepted 24 March 1999

Human papillomavirus (HPV) type 16 (HPV 16) and HPV type 18 (HPV 18) are implicated in the induction and progression of the majority of cervical cancers. Since the E6 and E7 oncoproteins of these viruses are expressed in these lesions, such proteins might be potential tumor-specific targets for immunotherapy. In this report, we demonstrate that recombinant, full-length E7-pulsed autologous dendritic cells (DC) can elicit a specific CD8+ cytotoxic T-lymphocyte (CTL) response against autologous tumor target cells in three patients with HPV 16- or HPV 18-positive cervical cancer. E7-specific CTL populations expressed strong cytolytic activity against autologous tumor cells, did not lyse autologous concanavalin A-treated lymphoblasts or autologous Epstein-Barr virus-transformed lymphoblastoid cell lines (LCL), and showed low levels of cytotoxicity against natural killer cell-sensitive K562 cells. Cytotoxicity against autologous tumor cells could be significantly blocked by anti-HLA class I (W6/32) and anti-CD11a/LFA-1 antibodies. Phenotypically, all CTL populations were CD3+/CD8+, with variable levels of CD56 expression. CTL induced by E7-pulsed DC were also highly cytotoxic against an allogeneic HLA-A2+ HPV 16-positive matched cell line (CaSki). In addition, we show that specific lymphoproliferative responses by autologous CD4+ T cells can also be induced by E7-pulsed autologus DC. E7-specific CD4+ T cells proliferated in response to E7-pulsed LCL but not unpulsed LCL, and this response could be blocked by anti-HLA class II antibody. Finally, with two-color flow cytometric analysis of intracellular cytokine expression at the single-cell level, a marked Th1-like bias (as determined by the frequency of gamma interferon- and interleukin 4-expressing cells) was observable for both CD8+ and CD4+ E7-specific lymphocyte populations. Taken together, these data demonstrate that full-length E7-pulsed DC can induce both E7-specific CD4+ T-cell proliferative responses and strong CD8+ CTL responses capable of lysing autologous naturally HPV-infected cancer cells in patients with cervical cancer. These results may have important implications for the treatment of cervical cancer patients with active or adoptive immunotherapy.

* Corresponding author. Mailing address: UAMS Medical Center, Division of Gynecologic Oncology, University of Arkansas, 4301 W. Markham, Little Rock, AR 72205-7199. Phone: (501) 686-7162. Fax: (501) 686-8091. E-mail: cannonmartin{at}exchange.uams.edu.

Journal of Virology, July 1999, p. 5402-5410, Vol. 73, No. 7
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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