5-Fluorouracil induced Fas upregulation associated with apoptosis in liver metastases of colorectal cancer patients.
Ann Oncol
; 12(2): 209-16, 2001 Feb.
Article
em En
| MEDLINE
| ID: mdl-11300326
ABSTRACT
BACKGROUND:
In vitro, thymidylate synthase (TS) inhibition by 5-fluorouracil (5-FU) induces thymineless apoptosis possibly via Fas receptor Fas ligand interactions and cell-cycle arrest. In colorectal cancer patients we evaluated whether 5-FU administration also resulted in apoptosis and cell-cycle arrest and which proteins might be involved. PATIENTS ANDMETHODS:
Biopsy specimens were taken from 36 patients 2, 22 or 46 hours after administration of 500 mg/m2 5-FU, and from 12 control patients who did not receive 5-FU. In frozen tissue-sections from liver metastases immunohistochemistry was performed with antibodies directed against p53, p21, E2F2, Rb, Ki67 and TS (cell-cycle related) and bax, BCL-2, BCL-x, mcl-1, PARP, caspase-3, Fas receptor and Fas ligand (apoptosis related). Apoptosis was determined by M30 immunostaining, which recognises a cleavage product of cytokeratin 18.RESULTS:
Fas receptor expression was 50% higher (P = 0.036) 46 hours after 5-FU administration compared to the control group. This was associated with a 12% increase (P < 0.02) in M30 positive tumour cells and with elevation of caspase-3 and PARP expression. The expression of Ki67 and E2F2 was 30% lower after 46 hours compared to the control group, whereas TS was 56% lower after 2 hours and 32% higher again after 46 hours. No differences in the expression of the other proteins were found.CONCLUSIONS:
These results suggest that 5-FU decreases proliferation status and induces apoptosis possibly via the Fas pathway. Since Fas mediated cell killing is important for cytotoxic T cells this indicates that clinical studies combining immunotherapy for activation of T cells and chemotherapy using 5-FU might be very effective.
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Coleções:
01-internacional
Contexto em Saúde:
6_ODS3_enfermedades_notrasmisibles
Base de dados:
MEDLINE
Assunto principal:
Glicoproteínas de Membrana
/
Neoplasias Colorretais
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Adenocarcinoma
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Apoptose
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Receptor fas
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Fluoruracila
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Neoplasias Hepáticas
/
Antimetabólitos Antineoplásicos
Tipo de estudo:
Risk_factors_studies
Limite:
Adult
/
Aged
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Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Ann Oncol
Ano de publicação:
2001
Tipo de documento:
Article