Protein Information

Name aldehyde reductase
Synonyms ADR; ALDR 1; ALDR1; Aldehyde reductase; AKR1B1; AKR1B1 protein; AR; Aldehyde reductase 1…

Compound Information

Name ethoxyquin
CAS 6-ethoxy-1,2-dihydro-2,2,4-trimethylquinoline

Reference List

PubMed Abstract RScore(About this table)
8234296 Ellis EM, Judah DJ, Neal GE, Hayes JD: An ethoxyquin-inducible aldehyde reductase from rat liver that metabolizes aflatoxin B1 defines a subfamily of aldo-keto reductases. Proc Natl Acad Sci U S A. 1993 Nov 1;90(21):10350-4.
39(0,1,2,4) Details
8923030 Hayes JD, McLeod R, Ellis EM, Pulford DJ, Ireland LS, McLellan LI, Judah DJ, Manson MM, Neal GE: Regulation of glutathione S-transferases and aldehyde reductase by chemoprotectors: studies of mechanisms responsible for inducible resistance to aflatoxin B1. IARC Sci Publ. 1996;(139):175-87.

Two detoxification enzymes that mediate ethoxyquin-induced chemoprotection against AFB1 have been identified by protein purification: a glutathione S-transferase (GST) Yc2 subunit with at least 100-fold greater activity towards AFB1-8,9-epoxide than previously studied transferases, and a unique aldehyde reductase with activity towards the dialdehydic form of AFB1-8,9-dihydrodiol.
33(0,1,1,3) Details
9328168 Manson MM, Ball HW, Barrett MC, Clark HL, Judah DJ, Williamson G, Neal GE: Mechanism of action of dietary chemoprotective agents in rat liver: induction of phase I and II drug metabolizing enzymes and aflatoxin B1 metabolism. Carcinogenesis. 1997 Sep;18(9):1729-38.

Particularly because of their ability to induce the detoxifying activities of glutathione S-transferase Yc2 and aldehyde reductase, butylated hydroxytoluene, ethoxyquin, indole-3-carbinol, oltipraz, phenethyl isothiocyanate and sinigrin will be effective blocking agents in rodents, if administered prior to AFB1.
32(0,1,1,2) Details
8503840 Judah DJ, Hayes JD, Yang JC, Lian LY, Roberts GC, Farmer PB, Lamb JH, Neal GE: A novel aldehyde reductase with activity towards a metabolite of aflatoxin B1 is expressed in rat liver during carcinogenesis and following the administration of an anti-oxidant. Biochem J. 1993 May 15;292 ( Pt 1):13-8.

In contrast with fractions from control animals, an aldehyde reductase, which catalyses the reduction of aflatoxin B1-dihydrodiol, in the dialdehyde form at physiological pH values, to aflatoxin B1-dialcohol, is expressed in cytosolic fractions prepared from rat livers bearing pre-neoplastic lesions, or following treatment with the anti-oxidant ethoxyquin.
32(0,1,1,2) Details
14667815 Barski OA, Papusha VZ, Kunkel GR, Gabbay KH: Regulation of aldehyde reductase expression by STAF and CHOP. . Genomics. 2004 Jan;83(1):119-29.

Transfection of the human promoter into ethoxyquin-treated mouse 3T3 cells induces a 3.5-fold increase in promoter activity and a CHOP-C/EBP band appears on gel shifts performed with the 5' probe from the human aldehyde reductase promoter.
12(0,0,1,7) Details
9310340 Jez JM, Flynn TG, Penning TM: A new nomenclature for the aldo-keto reductase superfamily. Biochem Pharmacol. 1997 Sep 15;54(6):639-47.

Other families include the prokaryotic AKRs, the plant chalcone reductases, the Shaker channels, and the ethoxyquin-inducible aflatoxin B1 aldehyde reductase.
9(0,0,1,4) Details
10816434 Kelly VP, Ireland LS, Ellis EM, Hayes JD: Purification from rat liver of a novel constitutively expressed member of the aldo-keto reductase 7 family that is widely distributed in extrahepatic tissues. Biochem J. 2000 Jun 1;348 Pt 2:389-400.

This novel enzyme is designated rat aflatoxin B (1) aldehyde reductase 2 (rAFAR2) and it characteristically migrates faster during SDS/PAGE than does the archetypal ethoxyquin-inducible rAFAR protein (now called rAFAR1).
6(0,0,1,1) Details
9679543 Hayes JD, Pulford DJ, Ellis EM, McLeod R, James RF, Seidegard J, Mosialou E, Jernstrom B, Neal GE: Regulation of rat glutathione S-transferase A5 by cancer chemopreventive agents: mechanisms of inducible resistance to aflatoxin B1. Chem Biol Interact. 1998 Apr 24;111-112:51-67.

In addition to GSTA5, we have identified a novel aflatoxin-aldehyde reductase (AFAR) that is similarly induced by ethoxyquin.
6(0,0,1,1) Details
14676331 Keightley JA, Shang L, Kinter M: Proteomic analysis of oxidative stress-resistant cells: a specific role for aldose reductase overexpression in cytoprotection. Mol Cell Proteomics. 2004 Feb;3(2):167-75. Epub 2003 Dec 15.

Based on this observation, the role of AR in the resistant phenotype was investigated by using a combination of AR induction with ethoxyquin and AR inhibition with Alrestatin to test the cytotoxicity of two oxidation-derived aldehydes: acrolein and glycolaldehyde.
2(0,0,0,2) Details
10706111 Kelly VP, Ellis EM, Manson MM, Chanas SA, Moffat GJ, McLeod R, Judah DJ, Neal GE, Hayes JD: Chemoprevention of aflatoxin B1 hepatocarcinogenesis by coumarin, a natural benzopyrone that is a potent inducer of aflatoxin B1-aldehyde reductase, the glutathione S-transferase A5 and P1 subunits, and NAD (P) H:quinone oxidoreductase in rat liver. Cancer Res. 2000 Feb 15;60(4):957-69.

Treatment with either phytochemicals [benzyl isothiocyanate, coumarin (CMRN), or indole-3-carbinol] or synthetic antioxidants and other drugs (butylated hydroxyanisole, diethyl maleate, ethoxyquin, beta-naphthoflavone, oltipraz, phenobarbital, or trans-stilbene oxide) has been found to increase hepatic aldo-keto reductase activity toward AFB1-dialdehyde and glutathione S-transferase (GST) activity toward AFB1-8,9-epoxide in both male and female rats.
2(0,0,0,2) Details
9823300 Praml C, Savelyeva L, Perri P, Schwab M: Cloning of the human aflatoxin B1-aldehyde reductase gene at 1p35-1p36.1 in a region frequently altered in human tumor cells. Cancer Res. 1998 Nov 15;58(22):5014-8.

In rat liver, Afar is strongly inducible by the antioxidants ethoxyquin and butylated hydroxyanisole, which protect the rat against aflatoxin B1-induced liver tumorigenesis by detoxifying its genotoxic and cytotoxic dialdehyde.
2(0,0,0,2) Details
8198522 McLellan LI, Judah DJ, Neal GE, Hayes JD: Regulation of aflatoxin B1-metabolizing aldehyde reductase and glutathione S-transferase by chemoprotectors. Biochem J. 1994 May 15;300 ( Pt 1):117-24.

We have previously shown that treatment of rats with the chemoprotector ethoxyquin (EQ) results in a marked increase in expression of the Alpha-class glutathione S-transferase (GST) Yc2 subunit which has high activity towards AFB1-8,9-epoxide [Hayes, Judah, McLellan, Kerr, Peacock and Neal (1991) Biochem.
2(0,0,0,2) Details
11728387 Grant A, Staffas L, Mancowitz L, Kelly VP, Manson MM, DePierre JW, Hayes JD, Ellis EM: Expression of rat aldehyde reductase AKR7A1: influence of age and sex and tissue-specific inducibility. Biochem Pharmacol. 2001 Dec 1;62(11):1511-9.

However, AKR7A1 was inducible by the synthetic antioxidant ethoxyquin in liver, kidney, and small intestine, but not in the other tissues examined.
1(0,0,0,1) Details
8395332 Hayes JD, Judah DJ, Neal GE: Resistance to aflatoxin B1 is associated with the expression of a novel aldo-keto reductase which has catalytic activity towards a cytotoxic aldehyde-containing metabolite of the toxin. Cancer Res. 1993 Sep 1;53(17):3887-94.

Therefore, this inducible enzyme has been designated aflatoxin B1-aldehyde reductase (AFB1-AR).
Fischer 344 rats readily develop liver cancer when exposed to aflatoxin B1 (AFB1) but dietary administration of the antioxidant ethoxyquin (EQ) provides protection against hepatocarcinogenesis.
1(0,0,0,1) Details