Primary brain lymphoma cell turnover differs in patients with and without AIDS: relationships to bcl-2 expression and host cell reaction.

Abstract:

:Primary central nervous system lymphomas (PCNSLs) are more resistant to radiotherapy and chemotherapy in AIDS (A-PCNSLs) than in non-AIDS patients (NA-PCNSLs). We investigated 23 A-PCNSLs and 24 NA-PCNSLs. Lymphoma cell kinetics (i.e. proliferation [mitotic index, MIB-1 and PCNA labeling indices], apoptosis and turnover) were determined and compared with bcl-2 and LMP-1 expression, and to the percentage of tumor-infiltrating T-lymphocytes (T-TILs) and macrophages. A-PCNSLs showed lower proliferation (p < 0.005), less apoptosis (p < 0.0001) and slower cell-turnover (p < 0.0001) than NA-PCNSLs. LMP-1 was detected in 90% of A-PCNSLs and 5% of NA-PCNSLs, a finding correlating positively with bcl-2 expression (p < 0.0007). In contrast, T-TIL counts and CD4/CD8 T-TIL ratios were similar in A-PCNSLs and NA-PCNSLs. T-TIL counts correlated negatively with proliferation indices (from p < 0.05 to p < 0.0005) in NA-PCNSLs, but not in A-PCNSLs. Macrophage counts correlated positively with apoptosis in both groups. We concluded the following: (i) A-PCNSLs are characterized by accumulation of slow-cycling, long-lived cells that might be protected from apoptosis by LMP-1 induced bcl-2 expression, and independently from the host response; (ii) NA-PCNSLs are characterized by a faster cell turnover associated with an insufficient antiproliferative host response; and (iii) A-PCNSLs and NA-PCNSLs constitute 2 entities with distinctive morphology and different kinetic profiles that could account for different responses to therapy.

authors

Christov C,Adle-Biassette H,Lechapt E,Poron F,Gray F,Gaulard P,Gherardi RK

doi

10.1097/00005072-199910000-00005

subject

Has Abstract

pub_date

1999-10-01 00:00:00

pages

1069-77

issue

10

eissn

0022-3069

issn

1554-6578

journal_volume

58

pub_type

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