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Human astrocytomas co-expressing Fas and Fas ligand also produce TGFbeta2 and Bcl-2.

Abstract：

:Human astrocytomas frequently co-express Fas (APO-1/CD95) and Fas ligand (FasL), yet do not appear to be overly susceptible to suicidal, fratricidal and immune-mediated elimination. This suggests that these gliomas have acquired mechanisms to prevent Fas-mediated apoptosis from occurring. Candidates for such a role include transforming growth factor-beta2 (TGFbeta2) and B-cell lymphoma/leukemia-2 (Bcl-2). TGFbeta2 effectively functions by hiding tumor cells from the immune system. This may potentially prevent the delivery of FasL from cytolytic T cells to Fas bearing astrocytomas. Bcl-2 works by rendering gliomas resistant to Fas-mediated apoptosis. Using immunohistochemistry, we analyzed seventy-six human astrocytomas (11 World Health Organization (WHO) grade I, 17 grade II, 17 grade III, and 31 grade IV) for the expression of Fas, FasL, TGFbeta2 and Bcl-2 in vivo. Positive immunoreactivity was found to significantly increase with increasing tumor grade for Fas (p < 0.0002), FasL (p < 0.0001), TGFbeta2 (p < 0.001) and Bcl-2 (p < 0.01). In addition, Fas/FasL co-expression, a counter-intuitive combination of factors in regards to glioma survival, also increased with WHO grade. Forty-five of 76 (59%) astrocytomas co-expressed Fas and FasL. Of those co-expressing Fas and FasL, 44 of 45 (98%) produced TGFbeta2, and 26 of 45 (58%) expressed Bcl-2. We found a significant positive correlation between Fas/FasL co-expression and TGFbeta2 (p < 0.002) and Bcl-2 (p < 0.005) production. We conclude that Fas and FasL are frequently co-expressed in human astrocytomas and these tumors are likely to produce other immunosuppressive and antiapoptotic factors such as TGFbeta2 and Bcl-2.

journal_name

J Neurooncol

journal_title

Journal of neuro-oncology

authors

Frankel B,Longo SL,Ryken TC

doi

10.1023/a:1006311231189

subject

Has Abstract

pub_date

1999-01-01 00:00:00

pages

205-12

issue

3

eissn

0167-594X

issn

1573-7373

journal_volume

44

pub_type

杂志文章

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