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Expression of Fas and Fas-related molecules in human hepatocellular carcinoma.
- Source :
-
Human pathology [Hum Pathol] 2001 Mar; Vol. 32 (3), pp. 250-6. - Publication Year :
- 2001
-
Abstract
- Many tumor cells, including hepatocellular carcinoma (HCC), express both Fas and its ligand on their surfaces, and it has remained a mystery why such cells do not spontaneously become apoptotic. In the current study, we analyzed the alterations of Fas structure and the expression of Fas and Fas ligand (FasL) and of Fas pathway inhibitors, including soluble Fas (sFas), Fas-associated phosphatase-1 (FAP-1), and bcl-2, in 50 cases of human HCC. Monoallelic loss of the Fas gene, as determined by loss of heterozygosity with intragenic polymorphisms, was observed in 5 of the 34 informative cases (15%), but none of the 50 cases showed Fas gene mutation. Expression of Fas and FasL was detected in 44 (88%) and 50 (100%) cases, respectively. sFas messenger RNA, as analyzed by in situ reverse-transcription polymerase chain reaction was expressed in 42 of the 50 cases (84%), and FAP-1 expression was observed in 40 of the 50 cases (80%). In contrast, none of the 50 cases showed bcl-2 expression. Our results showed that the majority of the HCCs (88%) coexpressed a death receptor, Fas and its cognate ligand, FasL, but all HCCs showed one or more alterations of the Fas pathway molecules known to inhibit Fas-mediated apoptosis. These findings suggest that the expression of sFas and FAP-1 and, in part, loss of Fas expression, rather than Fas gene alteration or bcl-2 expression, may be involved in the Fas resistance of HCC in vivo and that these mechanisms may play important roles in the pathogenesis of human HCC. HUM PATHOL 32:250-256.<br /> (Copyright 2001 by W.B. Saunders Company)
- Subjects :
- Adult
Aged
Apoptosis
Carcinoma, Hepatocellular genetics
Carcinoma, Hepatocellular pathology
Carrier Proteins analysis
Fas Ligand Protein
Female
Gene Expression
Humans
Immunohistochemistry
Liver Neoplasms genetics
Liver Neoplasms pathology
Male
Middle Aged
Mutation
Polymerase Chain Reaction
Polymorphism, Single-Stranded Conformational
Protein Phosphatase 1
Protein Tyrosine Phosphatase, Non-Receptor Type 13
Protein Tyrosine Phosphatases analysis
Proto-Oncogene Proteins c-bcl-2 analysis
RNA, Messenger analysis
Reverse Transcriptase Polymerase Chain Reaction
Solubility
fas Receptor genetics
Carcinoma, Hepatocellular chemistry
Liver Neoplasms chemistry
Membrane Glycoproteins analysis
fas Receptor analysis
Subjects
Details
- Language :
- English
- ISSN :
- 0046-8177
- Volume :
- 32
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Human pathology
- Publication Type :
- Academic Journal
- Accession number :
- 11274632
- Full Text :
- https://doi.org/10.1053/hupa.2001.22769