Metabolism of lovastatin by rat and human liver microsomes in vitro. 1988

M D Greenspan, and J B Yudkovitz, and A W Alberts, and L S Argenbright, and B H Arison, and J L Smith
Merck Institute for Therapeutic Research, Merck Sharp & Dohme Research Laboratories, Rahway, New Jersey 07065-0900.

The metabolism of lovastatin (Mevacor) was examined using isolated microsomes derived from the livers of normal and phenobarbital-treated rats and from human liver samples. Incubation of lovastatin with rat liver microsomes resulted in the formation of several polar metabolites of lovastatin. The metabolites were isolated by HPLC and identified by NMR and mass spectrometry. One fraction consisted of a 2:1 mixture of 6-hydroxy-lovastatin and the rearrangement product delta 4,5-3-hydroxy lovastatin. Addition of a trace of acid to this mixture resulted in the formation of a single aromatized product, the desacyl-delta 4a,6,8-dehydro analog of lovastatin. Another microsomal metabolite was determined to be the delta 4,8a,1-3-hydroxy-lovastatin derivative. The chromatographic pattern of metabolites produced from lovastatin by human liver microsomes was similar to that obtained with rat liver microsomes. Metabolism of lovastatin by rat liver microsomes was both time and concentration dependent; optimal microsomal metabolism occurred with 0.1 mM lovastatin, whereas higher lovastatin concentrations inhibited the reaction. The open acid form of lovastatin was poorly metabolized by both the rat and the human liver microsomes.

UI MeSH Term Description Entries
D008148 Lovastatin A fungal metabolite isolated from cultures of Aspergillus terreus. The compound is a potent anticholesteremic agent. It inhibits 3-hydroxy-3-methylglutaryl coenzyme A reductase (HYDROXYMETHYLGLUTARYL COA REDUCTASES), which is the rate-limiting enzyme in cholesterol biosynthesis. It also stimulates the production of low-density lipoprotein receptors in the liver. Lovastatin, 1 alpha-Isomer,Mevinolin,6-Methylcompactin,Lovastatin, (1 alpha(S*))-Isomer,MK-803,Mevacor,Monacolin K,1 alpha-Isomer Lovastatin,6 Methylcompactin,Lovastatin, 1 alpha Isomer,MK 803,MK803,alpha-Isomer Lovastatin, 1
D008297 Male Males
D008862 Microsomes, Liver Closed vesicles of fragmented endoplasmic reticulum created when liver cells or tissue are disrupted by homogenization. They may be smooth or rough. Liver Microsomes,Liver Microsome,Microsome, Liver
D009682 Magnetic Resonance Spectroscopy Spectroscopic method of measuring the magnetic moment of elementary particles such as atomic nuclei, protons or electrons. It is employed in clinical applications such as NMR Tomography (MAGNETIC RESONANCE IMAGING). In Vivo NMR Spectroscopy,MR Spectroscopy,Magnetic Resonance,NMR Spectroscopy,NMR Spectroscopy, In Vivo,Nuclear Magnetic Resonance,Spectroscopy, Magnetic Resonance,Spectroscopy, NMR,Spectroscopy, Nuclear Magnetic Resonance,Magnetic Resonance Spectroscopies,Magnetic Resonance, Nuclear,NMR Spectroscopies,Resonance Spectroscopy, Magnetic,Resonance, Magnetic,Resonance, Nuclear Magnetic,Spectroscopies, NMR,Spectroscopy, MR
D011919 Rats, Inbred Strains Genetically identical individuals developed from brother and sister matings which have been carried out for twenty or more generations or by parent x offspring matings carried out with certain restrictions. This also includes animals with a long history of closed colony breeding. August Rats,Inbred Rat Strains,Inbred Strain of Rat,Inbred Strain of Rats,Inbred Strains of Rats,Rat, Inbred Strain,August Rat,Inbred Rat Strain,Inbred Strain Rat,Inbred Strain Rats,Inbred Strains Rat,Inbred Strains Rats,Rat Inbred Strain,Rat Inbred Strains,Rat Strain, Inbred,Rat Strains, Inbred,Rat, August,Rat, Inbred Strains,Rats Inbred Strain,Rats Inbred Strains,Rats, August,Rats, Inbred Strain,Strain Rat, Inbred,Strain Rats, Inbred,Strain, Inbred Rat,Strains, Inbred Rat
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001711 Biotransformation The chemical alteration of an exogenous substance by or in a biological system. The alteration may inactivate the compound or it may result in the production of an active metabolite of an inactive parent compound. The alterations may be divided into METABOLIC DETOXICATION, PHASE I and METABOLIC DETOXICATION, PHASE II.
D013045 Species Specificity The restriction of a characteristic behavior, anatomical structure or physical system, such as immune response; metabolic response, or gene or gene variant to the members of one species. It refers to that property which differentiates one species from another but it is also used for phylogenetic levels higher or lower than the species. Species Specificities,Specificities, Species,Specificity, Species
D015394 Molecular Structure The location of the atoms, groups or ions relative to one another in a molecule, as well as the number, type and location of covalent bonds. Structure, Molecular,Molecular Structures,Structures, Molecular

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