title: Novel thiocoumarins as inhibitors of TNF-alpha induced ICAM-1 expression on human umbilical vein endothelial cells (HUVECs) and microsomal lipid peroxidation.
abstract: Different coumarin/thiocoumarin derivatives, that is, 7-hydroxy-4-methylcoumarin, 7,8-dihydroxy-4-methylcoumarin, 7-acetoxy-4-methylcoumarin, 7,8-diacetoxy-4-methylcoumarin, 7-hydroxy-4-methylthiocoumarin, 7,8-dihydroxy-4-methylthiocoumarin, 7-acetoxy-4-methylthiocoumarin and 7,8-diacetoxy-4-methylthiocoumarin were synthesized and evaluated for their effects on TNF-alpha induced expression of intercellular adhesion molecule-1 (ICAM-1) on endothelial cells and on NADPH-catalyzed rat liver microsomal lipid peroxidation with a view to identify modulators for expression of cell adhesion molecules and to establish structure-activity relationship. We found that dihydroxy and diacetoxy derivatives of thiocoumarin were more potent in comparison to the corresponding coumarin derivatives in inhibiting TNF-alpha-induced expression of ICAM-1. However, coumarin derivatives were found to be more potent in comparison to the corresponding thiocoumarins in inhibiting microsomal lipid peroxidation. We have also tested the intermediate compounds 7,8-dibenzyloxy-4-methylcoumarin and 7,8-dibenzyloxy-4-methylthiocoumarin for their inhibitory activity on TNF-alpha-induced ICMA-1 expression. We found that dibenzyloxy-4-methylthiocoumarin is better than dibenzyloxy-4-methylcoumarin. The mechanisms underlying the observed activities of coumarins and thiocoumarins have been discussed with reference to their structures. Such structure-function relationship studies may help in developing molecules with better anti-inflammatory and anti-oxidant activities.
authors.affiliation: Molecular Immunogenetics Laboratory, Institute of Genomics and Integrative Biology, Mall Road, Delhi-110 007, India.
authors.forename: Sarvesh
authors.initials: S
authors.lastname: Kumar
authors.forename: Brajendra K
authors.initials: BK
authors.lastname: Singh
authors.forename: Neerja
authors.initials: N
authors.lastname: Kalra
authors.forename: Vineet
authors.initials: V
authors.lastname: Kumar
authors.forename: Ajit
authors.initials: A
authors.lastname: Kumar
authors.forename: Ashok K
authors.initials: AK
authors.lastname: Prasad
authors.forename: Hanumantharao G
authors.initials: HG
authors.lastname: Raj
authors.forename: Virinder S
authors.initials: VS
authors.lastname: Parmar
authors.forename: Balaram
authors.initials: B
authors.lastname: Ghosh
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D003374:Coumarins / Q000494:pharmacology*; D004730:Endothelium, Vascular / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D018799:Intercellular Adhesion Molecule-1 / Q000378:metabolism*; D015227:Lipid Peroxidation / Q000187:drug effects*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D051381:Rats; D014409:Tumor Necrosis Factor-alpha / Q000037:antagonists & inhibitors* / Q000494:pharmacology
chemical_list: D003374:Coumarins; D014409:Tumor Necrosis Factor-alpha; D018799:Intercellular Adhesion Molecule-1