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Expression of tumour necrosis factor-alpha, -beta and interferon-gamma genes within human neuroglial tumour cells and brain specimens.

Abstract：

:Expression of cytokine genes, TNF-alpha, TNF-beta and IFN-gamma, in human astroglial cell lines and in fresh brain specimens was studied by PCR. mRNA transcripts of TNF-alpha could be detected in three out of five astrocytomas and neuroblastoma cell lines, and after stimulation with IL-1 beta/IFN-gamma or LPS/IFN-gamma all these cell lines expressed TNF-alpha genes. TNF-beta genes could not be detected in these cell lines. We were able to detect expression of IFN-gamma genes within two astrocytoma cell lines, which interestingly did not show TNF-alpha activity. In addition to the cultured cells, we also examined gene expression of these cytokines within four human malignant astrocytoma specimens, two peritumoral brain and two autopsied normal brains. The results show that tumour and surrounding reactive lesions express TNF-alpha genes (four of six) but not normal brains. The concentration of these cytokines in the supernatant of cultured cells was measured quantitatively by TNF-alpha, -beta or IFN-gamma ELISA. The combined stimulation of these neuroglial cell lines with IL-1 beta and LPS or IFN-gamma, revealed a high level of TNF-alpha activity. This was especially evident with a neuroblastoma cell line. The concentration of TNF-alpha in the supernatant of the IMR32 neuroblastoma cell line increased markedly upon stimulation with IL-1 beta in both a time- and dose-dependent fashion in the presence of LPS or IFN-gamma. Next, we examined expression of IL-1 beta and IFN-gamma genes in the brain specimens. The result shows that four in six tumour and peritumoral regions expressed IFN-gamma genes and one specimen showed IL-beta gene by PCR. From these experiments it is suspected that neuroglial cell-derived TNF-alpha induced by IL-1 beta of IFN-gamma may participate in local immune reactions of the brain in an autocrine and paracrine fashion.

journal_name

Cytokine

journal_title

Cytokine

authors

Nitta T,Ebato M,Sato K,Okumura K

doi

10.1016/1043-4666(94)90039-6

subject

Has Abstract

pub_date

1994-03-01 00:00:00

pages

171-80

issue

2

eissn

1043-4666

issn

1096-0023

pii

1043-4666(94)90039-6

journal_volume

6

pub_type

杂志文章

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