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Journal of Virology, August 1999, p. 6964-6972, Vol. 73, No. 8
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Jaagsiekte Sheep Retrovirus Is Necessary and Sufficient To Induce a Contagious Lung Cancer in Sheep

Massimo Palmarini,1 J. Michael Sharp,2 Marcelo de las Heras,3 and Hung Fan1,*

Cancer Research Institute and Department of Molecular Biology and Biochemistry, University of California at Irvine, Irvine, California 926971; Moredun Research Institute, International Research Center, Penicuik, Midlothian EH26 0PZ, United Kingdom2; and Department of Veterinary Pathology, Faculty of Veterinary Medicine, Zaragoza University, 50013 Zaragoza, Spain3

Received 12 February 1999/Accepted 28 April 1999

Sheep pulmonary adenomatosis (SPA) is a contagious and experimentally transmissible lung cancer of sheep resembling human bronchiolo-alveolar carcinoma. A type D retrovirus, known as jaagsiekte sheep retrovirus (JSRV), has been associated with the etiology of SPA, but its exact role in the induction of the tumor has not been clear due to the lack of (i) a tissue culture system for the propagation of JSRV and (ii) an infectious JSRV molecular clone. To investigate the role of JSRV in the etiology of SPA, we isolated a full-length JSRV proviral clone, pJSRV21, from a tumor genomic DNA library derived from a natural case of SPA. pJSRV21 was completely sequenced and showed open reading frames in agreement with those deduced for the original South African strain of JSRV. In vivo transfection of three newborn lambs by intratracheal inoculation with pJSRV21 DNA complexed with cationic lipids showed that pJSRV21 is an infectious molecular clone. Viral DNA was detected in the peripheral blood mononuclear cells (PBMCs) of the transfected animals by a highly sensitive JSRV-U3 heminested PCR at various time points ranging from 2 weeks to 6 months posttransfection. In addition, proviral DNA was detected in the PBMCs, lungs, and mediastinal lymph nodes of two lambs sacrificed 9 months posttransfection, but no macroscopic or histological SPA lesion was induced. We prepared JSRV particles by transient transfection of 293T cells with a JSRV construct (pCMV2JS21) in which the upstream U3 was replaced with the cytomegalovirus early promoter. Four newborn lambs were inoculated with JSRV21 particles produced in this manner, and two of them showed the classical signs of SPA 4 months postinfection. The resulting tumors were positive for JSRV DNA and protein. Thus, JSRV21 is an infectious and pathogenic molecular clone and is necessary and sufficient to induce sheep pulmonary adenomatosis.

* Corresponding author. Mailing address: Cancer Research Institute, Bio. Sci. II, University of California Irvine, Irvine, CA 92697. Phone: (949) 824-6631. Fax: (949) 824-4023. E-mail: hyfan{at}uci.edu.

Journal of Virology, August 1999, p. 6964-6972, Vol. 73, No. 8
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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