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CYP2E1
CYP2E1 Full Name
cytochrome P450, family 2, subfamily E, polypeptide 1
CYP2E1 Introduction
Cytochrome P450 2E1 (CYP2E1) is a key phase I metabolizing enzyme within the cytochrome P450 superfamily, playing a major role in the metabolism and clearance of xenobiotics in humans. It is highly expressed in the endoplasmic reticulum of the liver, with lower levels detected in extrahepatic tissues such as the lung, kidney, brain, and gastrointestinal tract. The expression of CYP2E1 is not constitutive but is induced by various factors. Ethanol is its most well-known and potent inducer; chronic alcohol consumption significantly upregulates CYP2E1 protein levels and enzymatic activity in the liver. Other inducers include obesity, ketosis in diabetes, and certain drugs (e.g., isoniazid) and chemicals.
Figure 1. Exogenous agents and pathologies associated with CYP2E1 activity and expression in brain. (Source: García-Suástegui WA, et al. 2017)
CYP2E1 primarily metabolizes a range of exogenous compounds and a limited number of endogenous substances. In alcohol metabolism, although alcohol dehydrogenase (ADH) serves as the primary pathway, the microsomal ethanol oxidizing system (MEOS)—mediated by CYP2E1—becomes significantly more important following chronic or heavy alcohol intake. This system not only accelerates ethanol clearance but also explains the "metabolic tolerance" observed in chronic drinkers. In drug metabolism, CYP2E1 is involved in the biotransformation of several commonly used medications, most notably acetaminophen. At normal doses, most acetaminophen is safely metabolized via phase II conjugation pathways, but a small fraction is converted by CYP2E1 into the highly toxic reactive intermediate N-acetyl-p-benzoquinone imine (NAPQI). Furthermore, CYP2E1 metabolizes and activates numerous environmental toxins and procarcinogens—such as the industrial solvent benzene, carbon tetrachloride, and nitrosamines found in tobacco smoke and processed foods—converting these relatively inert precursors into highly reactive carcinogens or cytotoxins.
In alcoholic liver disease (ALD), chronic alcohol-induced CYP2E1 overexpression drives pathology through three major mechanisms: (1)Accelerated ethanol metabolism generating toxic acetaldehyde; (2)Elevated production of reactive oxygen species (ROS) during catalytic cycles; (3)Enhanced metabolic activation of other hepatotoxic substances.Together, these processes trigger intense hepatic oxidative stress, lipid peroxidation, inflammation, and cell death, thereby promoting disease progression from steatosis to hepatitis, fibrosis, and ultimately cirrhosis.
Alternate Names for CYP2E1
CYP2E1; cytochrome P450, family 2, subfamily E, polypeptide 1; CPE1; CYP2E; P450-J; P450C2E; cytochrome P450 2E1; CYPIIE1; cytochrome P450-J; microsomal monooxygenase; xenobiotic monooxygenase; 4-nitrophenol 2-hydroxylase; flavoprotein-linked monooxygenase; cytochrome P450, subfamily IIE (ethanol-inducible), polypeptide 1;
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