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Journal of Virology, December 1998, p. 10073-10082, Vol. 72, No. 12
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Distinct Biology of Kaposi's Sarcoma-Associated Herpesvirus from Primary Lesions and Body Cavity Lymphomas

Jacques Friborg Jr.,1 Wing-Pui Kong,1 C. Clay Flowers,1 Scarlett L. Flowers,1 Yongnian Sun,1 Kimberly E. Foreman,2 Brian J. Nickoloff,2 and Gary J. Nabel1,*

Departments of Internal Medicine and Biological Chemistry, Howard Hughes Medical Institute, University of Michigan Medical Center, Ann Arbor, Michigan 48109-0650,1 and Skin Disease Research Laboratories, Department of Pathology, Cardinal Bernardin Cancer Center, Loyola University Medical Center, Maywood, Illinois 60153-53852

Received 9 March 1998/Accepted 9 September 1998

The DNA sequence for Kaposi's sarcoma-associated herpesvirus was originally detected in Kaposi's sarcoma biopsy specimens. Since its discovery, it has been possible to detect virus in cell lines established from AIDS-associated body cavity-based B-cell lymphoma and to propagate virus from primary Kaposi's sarcoma lesions in a human renal embryonic cell line, 293. In this study, we analyzed the infectivity of Kaposi's sarcoma-associated herpesvirus produced from these two sources. Viral isolates from cultured cutaneous primary KS cells was transmitted to an Epstein-Barr virus-negative Burkitt's B-lymphoma cell line, Louckes, and compared to virus induced from a body cavity-based B-cell lymphoma cell line. While propagation of body cavity-based B-cell lymphoma-derived virus was not observed in 293 cell cultures, infection with viral isolates obtained from primary Kaposi's sarcoma lesions induced injury in 293 cells typical of herpesvirus infection and was associated with apoptotic cell death. Interestingly, transient overexpression of the Kaposi's sarcoma-associated herpesvirus v-Bcl-2 homolog delayed the process of apoptosis and prolonged the survival of infected 293 cells. In contrast, the broad-spectrum caspase inhibitors Z-VAD-fmk and Z-DEVD-fmk failed to protect infected cell cultures, suggesting that Kaposi's sarcoma-associated herpesvirus-induced apoptosis occurs through a Bcl-2-dependent pathway. Kaposi's sarcoma-associated herpesvirus isolates from primary Kaposi's sarcoma lesions and body cavity-based lymphomas therefore may differ and are likely to have distinct contributions to the pathophysiology of Kaposi's sarcoma.

* Corresponding author. Mailing address: Howard Hughes Medical Institute, University of Michigan Medical Center, Departments of Internal Medicine and Biological Chemistry, 1150 W. Medical Center Dr., 4520 MSRB I, Ann Arbor, MI 48109-0650. Phone: (734) 647-4798. Fax: (734) 647-4730. E-mail: gnabel{at}umich.edu.

Journal of Virology, December 1998, p. 10073-10082, Vol. 72, No. 12
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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