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. 1974 Oct;71(10):4006–4010. doi: 10.1073/pnas.71.10.4006

Differences Between Laboratory Strains of Epstein-Barr Virus Based on Immortalization, Abortive Infection, and Interference

George Miller 1,2,3, James Robinson 1,2,3, Lee Heston 1,2,3, Muriel Lipman 1,2,3
PMCID: PMC434316  PMID: 4372601

Abstract

Biologic activities of extracellular Epstein-Barr virus (EB virus) from two laboratory strains, namely, P3J-HR-1 (P-H) from Burkitt lymphoma and B95-8 (B95) from infectious mononucleosis, were compared. Virus stocks from both sources contained approximately the same number of virions. Virus from the P-H line induced “early antigen” in six nonproducer EB virus genome carrier cell lines; virus from B95 did not induce “early antigen.” Extracellular virus from B95 regularly caused lymphocytes from human umbilical cords to form continuous lines (immortalization); P-H virus did not cause primary cultures of human lymphocytes to grow continuously. B95 virus stimulated DNA synthesis as determined by rate of incorporation of [3H]thymidine into acid-insoluble material; P-H virus did not stimulate DNA synthesis. Pretreatment of lymphocytes with undiluted P-H virus inhibited immortalization and stimulation of DNA synthesis by B95 virus. The inhibitory properties of the P-H virus were sedimented at 100,000 × g and inactivated by heat and UV irradiation; interference by the P-H virus was neutralized by human serum with antibody to EB virus and not by antibody-negative human serum.

The hypothesis most consistent with these results is that the P-H virus is defective in gene(s) needed for initiation of immortalization. We speculate that the absence of this gene allows early antigen to be expressed upon super-infection of nonproducer cell lines. The availability of two laboratory strains of EB virus which differ in biologic behavior provides starting material for analysis of the mechanism of lymphocyte immortalization by EB virus and of virus structural differences which affect immortalization.

Keywords: human lymphocytes, viral transformation, viral interference, extra-cellular virus

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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