Expression and release of interleukin-1 by human glioblastoma cells in vitro and in vivo.
The present study demonstrates interleukin-1 (IL-1) production by human glioblastoma cells both in vitro and in vivo. The presence of IL-1 alpha and IL-1 beta transcripts was analyzed in 4 cell lines. IL-1 alpha mRNA was expressed constitutively in one cell line whereas constitutive IL-1 beta mRNA could not be detected in any of the cell lines. IL-1 alpha transcripts could be induced with phorbol myristate acetate (PMA) or PMA plus lipopolysaccharide (LPS) in 2 of 4 cell lines and IL-1 beta mRNA in 2 of 4 cell lines. Culture fluid from these cell lines was tested for the presence of IL-1 using a specific radio-immuno-assay for either IL-1 alpha or IL-1 beta. In agreement with the results on RNA, one of 4 cell lines was found to constitutively produce IL-1 alpha but not IL-1 beta. After treatment with PMA and LPS, IL-1 alpha was detected in the culture fluid from two other lines and IL-1 beta in the medium from three lines. That the IL-1 produced by these cell lines was biologically active was confirmed in a two step thymocyte proliferation assay. IL-1 like activity was detected in all samples that were positive in the radio-immuno-assay. Finally, immunohistological analysis on fresh frozen tumour sections provided evidence for IL-1 production by glioblastoma cells in vivo. Fourteen out of 28 glioblastomas were stained with an anti-IL-1 alpha monoclonal antibody while none of them was stained with an anti-IL-1 beta antibody.
Gauthier
T
T
Neurosurgical Service, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland.
Hamou
M F
MF
Monod
L
L
Gallay
P
P
Carrel
S
S
de Tribolet
N
N
D001932:Brain Neoplasms / Q000235:genetics* / Q000473:pathology; D002460:Cell Line; D015972:Gene Expression Regulation, Neoplastic / Q000502:physiology*; D005904:Glial Fibrillary Acidic Protein / Q000502:physiology; D005910:Glioma / Q000235:genetics* / Q000473:pathology; D006801:Humans; D007124:Immunoenzyme Techniques; D007375:Interleukin-1 / Q000235:genetics* / Q000378:metabolism; D012334:RNA, Neoplasm / Q000235:genetics; D014158:Transcription, Genetic; D014407:Tumor Cells, Cultured / Q000502:physiology*
D005904:Glial Fibrillary Acidic Protein; D007375:Interleukin-1; D012334:RNA, Neoplasm