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Inhibition of 5-lipoxygenase induces cell growth arrest and apoptosis in rat Kupffer cells: implications for liver fibrosis
- Source :
- Europe PubMed Central, Scopus-Elsevier
-
Abstract
- The existence of an increased number of Kupffer cells is recognized as critical in the initiation of the inflammatory cascade leading to liver fibrosis. Because 5-lipoxygenase (5-LO) is a key regulator of cell growth and survival, in the current investigation we assessed whether inhibition of the 5-LO pathway would reduce the excessive number of Kupffer cells and attenuate inflammation and fibrosis in experimental liver disease. Kupffer cells were the only liver cell type endowed with a metabolically active 5-LO pathway (i.e., expressed mRNAs for 5-LO, 5-LO-activating protein [FLAP], and leukotriene [LT] C4 synthase and generated LTB4 and cysteinyl-LTs). Both the selective 5-LO inhibitor AA861 and the FLAP inhibitor BAY-X-1005 markedly reduced the number of Kupffer cells in culture. The antiproliferative properties of AA861 and BAY-X-1005 were associated with the occurrence of condensed nuclei, fragmented DNA, and changes in DNA content and cell cycle frequency distribution consistent with an apoptotic process. In vivo, in carbon tetrachloride-treated rats, BAY-X-1005 had a significant antifibrotic effect and reduced liver damage and the hepatic content of hydroxyproline. Together, these findings indicate a novel mechanism by which inactivation of the 5-LO pathway could disrupt the sequence of events leading to liver inflammation and fibrosis.
- Subjects :
- Liver cytology
Kupffer Cells
Inflammation
Apoptosis
Biology
Liver Cirrhosis, Experimental
Biochemistry
Models, Biological
Liver disease
Fibrosis
Genetics
medicine
Benzoquinones
Animals
Lipoxygenase Inhibitors
Molecular Biology
Cells, Cultured
Cell growth
Liver cell
Cell cycle
medicine.disease
Cell biology
Rats
Quinolines
medicine.symptom
Cell Division
Biotechnology
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Europe PubMed Central, Scopus-Elsevier
- Accession number :
- edsair.doi.dedup.....3745470702deb3e08fa3c495114eb95e