The Journal of Experimental Medicine
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Published online 5 March 2001.
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© The Rockefeller University Press, 0022-1007/2001/3/637/ $5.00
The Journal of Experimental Medicine, Volume 193, Number 5, March 5, 2001 637-642

Brief Definitive Report

Independence of Herpesvirus-induced T Cell Lymphoma from Viral Cyclin D Homologue

Armin Enssera, Diana Glykofrydesa, Henk Niphuisb, Eva M. Kuhnb, Brigitte Rosenwirthb, Jonathan L. Heeneyb, Gerald Niedobitekc, Ingrid Müller-Fleckensteina, and Bernhard Fleckensteina
a Institut für Klinische und Molekulare Virologie der Universität Erlangen-Nürnberg, 91054 Erlangen, Germany
b Biomedical Primate Research Center, Lange, 2288GJ Rijswijk, The Netherlands
c Pathologisch-Anatomisches Institut, 91054 Erlangen, Germany

Correspondence to: Armin Ensser, Institut für Klinische und Molekulare Virologie der Universität Erlangen-Nürnberg, Schlossgarten 4, 91054 Erlangen, Germany. Tel:149-9131-852-3786 Fax:149-9131-852-6493 E-mail:ensser{at}viro.med.uni-erlangen.de.

Cyclin D family members are cellular protooncogenes, and their viral homologues in the Kaposi's sarcoma-associated herpesvirus (KSHV, human herpesvirus type 8 [HHV-8]) and the closely related Herpesvirus saimiri have been implicated as putative cofactors of viral transformation and pathogenesis. KSHV is regularly found in Kaposi's sarcoma and in the primary effusion B cell lymphoma and Castleman's disease associated with immunosuppression and AIDS. H. saimiri strain C488 transforms human and marmoset T cells in vitro and causes polyclonal T cell lymphoma in New World monkeys. The viral cyclins stimulate cell cycle progression of quiescent fibroblasts, and they form active cyclin-dependent kinase (CDK)6 complexes of broad substrate specificity that can resist and downregulate cellular CDK inhibitors. This study shows that the viral cyclin of H. saimiri strain C488 is not required for viral replication, T cell transformation, and pathogenicity in New World primates.

Key Words: cell cycle, gammaherpesviridae, herpesvirus, Kaposi sarcoma associated, oncogenic viruses, callitrichinae


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