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. 1997 Jul;123(7):395–401. doi: 10.1007/BF01240123

Apoptosis, proliferative activity and Bcl-2 expression in Epstein-Barr-virus-positive non-Hodgkin's lymphomas

Yasuo Takano 1,✉, Makoto Saegusa 1, Mitsunobu Masuda 2, Tetsuo Mikami 1, Isao Okayasu 1
PMCID: PMC12200316  PMID: 9260592

Abstract

In order to clarify the effects of Epstein-Barr virus (EBV) infection on apoptosis and proliferative activity of non-Hodgkin's lymphoma, 135 Japanese lymphoma cases were investigated for the presence of viral RNA and its correlation withbcl-2 protein (Bcl-2) expression. In addition, the role of EBV in lymphomagenesis was also studied in terms of EBV genotyping and specific deletion in the gene for the latent membrane protein 1(LMP-1). EBER-1 RNA in situ hybridization revealed EBV in 18 cases (13.3%), comprising 12 of 44 T cell (27.3%) and 6 of 91 B cell (6.6%) lymphomas. Type A EBV was found in all 18 cases (100%), and 17 of the 17 (100%) evaluable cases showed a 30-bp deletion within the 3′ end ofLMP-1. Comparison of apoptotic indices (AI), assessed by DNA nick-end labelling, and proliferative activity, estimated in terms of Ki-67 labelling and mitotic indices (KI and MI), demonstrated an overall correlation among AI, KI and MI increases in association with Bcl-2 negativity, indicating a close relation between apoptosis and proliferation. EBV-positive cases showed significantly elevated AI values, independent of Bcl-2 positivity, with no change in KI and MI. These results indicate that EBV in Japanese non-Hodgkin's lymphomas is exclusively of type A with a specific deletion inLMP-1 and that it tends to be present in T cell lymphomas. Moreover, EBV up-regulates apoptosis without any relation to Bcl-2 expression and exerts only minor effects on proliferation.

Key words: Non-Hodgkin's lymphoma, Epstein-Barr virus, Apoptosis

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