Effect of E5324, a Novel Inhibitor of Acyl-CoA:Cholesterol Acyltransferase, on Cholesteryl Ester Synthesis and Accumulation in Macrophages
| Autor: | Hiroko Kobayashi, Teiji Kimura, Isao Saito, Motoji Kogushi, Issei Ohtsuka, Toshie Yamada, Hiroshi Tanaka |
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| Rok vydání: | 1995 |
| Předmět: |
Male
Lipoproteins Sterol O-acyltransferase Oleic Acids In Vitro Techniques Rats Sprague-Dawley chemistry.chemical_compound Tumor Cells Cultured Animals Humans Enzyme Inhibitors Triglycerides Pharmacology chemistry.chemical_classification biology Cholesterol Macrophages Phenylurea Compounds Metabolism Rats Enzyme chemistry Biochemistry Enzyme inhibitor biology.protein Phorbol Microsome Cholesteryl ester lipids (amino acids peptides and proteins) Cholesterol Esters Rabbits Sterol O-Acyltransferase |
| Zdroj: | Japanese Journal of Pharmacology. 68:191-199 |
| ISSN: | 0021-5198 |
| DOI: | 10.1254/jjp.68.191 |
| Popis: | The in vitro potencies of a novel inhibitor of acyl-CoA :cholesterol acyltransferase (ACAT), E5324 (n-butyl-N'-[2-[3-(5-ethyl-4-phenyl-1H-imidazol-1-yl)propoxy] -6-methylphenyl]urea), were studied. E5324 was found to be a potent ACAT inhibitor in microsomes from a various tissues and in cultured cell homogenate, with IC 50 values in the range of 0.044 to 0.19 μM. The kinetic study on E5324 showed that the inhibition of rat intestine ACAT was competitive with respect to oleoyl CoA. E5324 inhibited [ 3 H]oleate incorporation into cholesteryl [ 3 H]oleate in phorbol ester-treated THP-1 cell lines (IC 50 = 0.44 μM). The rate of [ 3 H]oleate incorporation into phospholipids and triglycerides was not affected by E5324. In an experiment with [ 3 H]cholesterol as the substrate for ACAT, E5324 also inhibited [ 3 H]cholesteryl ester synthesis (IC 50 =0.41 μM). Furthermore, E5324 prevented accumulation of both esterified and total cholesterol in acetyl low density lipoprotein-loaded THP-1 cells. These results indicate that E5324 is a potent and selective ACAT inhibitor and prevents cholesteryl ester accumulation in macrophages. |
| Databáze: | OpenAIRE |
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