title: Apoptosis induced by butyrate is independent of Jak/STAT signaling in a fibrosarcoma cell line.
abstract: The aim of this study was to evaluate the participation of the Jak-1 and STAT-1 proteins in sodium butyrate-induced apoptosis in 2C4 cells derived from human fibrosarcoma. Making use of Jak-1 or STAT-1 deficient cell lines, we demonstrated that the apoptotic process induced by butyrate is independent of the presence of these proteins. In addition, this work showed that, although the constitutive expression of pro-caspases-2 and -3 is reduced in STAT-1 cells, the activity of caspase-3 is preserved in both Jak-1 and STAT-1 deficient cells and is similar to that seen in 2C4 parental cells. In conclusion, we demonstrated that the absence of functionally active Jak-1 or STAT-1 protein directly affects the TNF-alpha-induced apoptosis, but does not alter the sodium butyrate-induced apoptosis in cells derived from human fibrosarcoma.
authors.affiliation: Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Brazil.
authors.forename: Flávia L A
authors.initials: FL
authors.lastname: Rabelo
authors.forename: Mariana G
authors.initials: MG
authors.lastname: Ramos
authors.forename: Gabriela
authors.initials: G
authors.lastname: Brumatti
authors.forename: Gustavo P
authors.initials: GP
authors.lastname: Amarante-Mendes
authors.forename: Catherine
authors.initials: C
authors.lastname: Ropert
authors.forename: Cláudio A
authors.initials: CA
authors.lastname: Bonjardim
authors.forename: Jacqueline I
authors.initials: JI
authors.lastname: Alvarez-Leite
mesh_terms: D017209:Apoptosis / Q000187:drug effects* / Q000502:physiology; D002087:Butyrates / Q000008:administration & dosage / Q000494:pharmacology*; D053143:Caspase 2; D053148:Caspase 3; D020169:Caspases / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D004789:Enzyme Activation / Q000187:drug effects; D004792:Enzyme Precursors / Q000378:metabolism; D005354:Fibrosarcoma / Q000378:metabolism / Q000473:pathology; D006801:Humans; D053613:Janus Kinase 1; D011505:Protein-Tyrosine Kinases / Q000378:metabolism*; D050794:STAT1 Transcription Factor; D015534:Trans-Activators / Q000378:metabolism*; D014407:Tumor Cells, Cultured; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
chemical_list: D002087:Butyrates; D004268:DNA-Binding Proteins; D004792:Enzyme Precursors; D050794:STAT1 Transcription Factor; C494079:STAT1 protein, human; D015534:Trans-Activators; D014409:Tumor Necrosis Factor-alpha; D011505:Protein-Tyrosine Kinases; C507904:JAK1 protein, human; D053613:Janus Kinase 1; C505407:CASP3 protein, human; D053143:Caspase 2; D053148:Caspase 3; D020169:Caspases