Protein Information

Name cytochrome P450 (protein family or complex)
Synonyms cytochrome P450; cytochrome P 450; CYP450; CYP 450

Compound Information

Name ethylene dibromide
CAS 1,2-dibromoethane

Reference List

PubMed Abstract RScore(About this table)
9073592 Ploemen JP, Wormhoudt LW, Haenen GR, Oudshoorn MJ, Commandeur JN, Vermeulen NP, de Waziers I, Beaune PH, Watabe T, van Bladeren PJ: The use of human in vitro metabolic parameters to explore the risk assessment of hazardous compounds: the case of ethylene dibromide. Toxicol Appl Pharmacol. 1997 Mar;143(1):56-69.

Ethylene dibromide (1,2-dibromoethane, EDB) is metabolized by two routes: a conjugative route catalyzed by glutathione S-transferases (GST) and an oxidative route catalyzed by cytochrome P450 (P450).
31(0,1,1,1) Details
8435094 Khan S, Sood C, O'Brien PJ: Molecular mechanisms of dibromoalkane cytotoxicity in isolated rat hepatocytes. Biochem Pharmacol. 1993 Jan 26;45(2):439-47.


Bromoaldehydic metabolites formed by cytochrome P450-dependent mixed-function oxidases were probably responsible for lipid peroxidation as deuterated 1,2-dibromoethane (d4-DBE) induced less lipid peroxidation and was less cytotoxic even though GSH was depleted as rapidly and as effectively.
4(0,0,0,4) Details
3514588 Tamura S, Sugiyama T, Minami Y, Tarui S, Okamoto M, Yamano T: Analysis of debromination of 1,2-dibromoethane by cytochrome P-450-linked hydroxylation systems as observed by bromide electrode. J Biochem. 1986 Jan;99(1):163-71.

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3532707 Sipes IG, Wiersma DA, Armstrong DJ: The role of glutathione in the toxicity of xenobiotic compounds: metabolic activation of 1,2-dibromoethane by glutathione. Adv Exp Med Biol. 1986;197:457-67.


Unstable metabolites may arise during the metabolism of xenobiotic compounds with enzyme systems other than the cytochrome P-450 system.
3(0,0,0,3) Details
9107551 Wormhoudt LW, Commandeur JN, Ploemen JH, Abdoelgafoer RS, Makansi A, Van Bladeren PJ, Vermeulen NP: Urinary thiodiacetic acid. Drug Metab Dispos. 1997 Apr;25(4):508-15.


A selective biomarker for the cytochrome P450-catalyzed oxidation of 1,2-dibromoethane in the rat..
2(0,0,0,2) Details
8620578 Wormhoudt LW, Ploemen JH, Commandeur JN, van Ommen B, van Bladeren P, Vermeulen NP: Cytochrome P450 catalyzed metabolism of 1,2-dibromoethane in liver microsomes of differentially induced rats. Chem Biol Interact. 1996 Jan 5;99(1-3):41-53.

2(0,0,0,2) Details
1448445 Nichols WK, Covington MO, Seiders CD, Safiullah S, Yost GS: Bioactivation of halogenated hydrocarbons by rabbit pulmonary cells. Pharmacol Toxicol. 1992 Nov;71(5):335-9.


Evidence of cytochrome P-450 bioactivation was assessed by utilizing the suicide inhibitor, 1-aminobenzotriazole (ABT) to ameliorate cytotoxicity.
2(0,0,0,2) Details
3512989 Guobaitis RJ, Ellingham TJ, Maddock MB: The effects of pretreatment with cytochrome P-450 inducers and preincubation with a cytochrome P-450 effector on the mutagenicity of genotoxic carcinogens mediated by hepatic and renal S9 from two species of marine fish. Mutat Res. 1986 Feb;164(1):59-70.

Neither UI S9 from toadfish liver or kidney nor that from eel liver consistently affected the direct mutagenicity of ethylene dibromide (EDB) or substantially activated dimethylnitrosamine (DMN).
2(0,0,0,2) Details
8870687 Wormhoudt LW, Ploemen JH, de Waziers I, Commandeur JN, Beaune PH, van Bladeren PJ, Vermeulen NP: Inter-individual variability in the oxidation of 1,2-dibromoethane: use of heterologously expressed human cytochrome P450 and human liver microsomes. Chem Biol Interact. 1996 Sep 6;101(3):175-92.

2(0,0,0,2) Details
1664256 Guengerich FP, Kim DH, Iwasaki M: Role of human cytochrome P-450 IIE1 in the oxidation of many low molecular weight cancer suspects. Chem Res Toxicol. 1991 Mar-Apr;4(2):168-79.

The results collectively indicate that P-450 IIE1 is a major catalyst of the oxidation of benzene, styrene, CCl4, CHCl3, CH2Cl2, CH3Cl, CH3CCl3, 1,2-dichloropropane, ethylene dichloride, ethylene dibromide, vinyl chloride, vinyl bromide, acrylonitrile, vinyl carbamate, ethyl carbamate, and trichloroethylene.
2(0,0,0,2) Details
3512119 Working PK, Smith-Oliver T, White RD, Butterworth BE: Induction of DNA repair in rat spermatocytes and hepatocytes by 1,2-dibromoethane: the role of glutathione conjugation. Carcinogenesis. 1986 Mar;7(3):467-72.


EDB is biotransformed either by cytochrome P450-dependent oxidation, leading to the formation of bromoacetaldehyde, or by enzyme-catalyzed conjugation with glutathione, giving rise to reactive half-sulfur mustard compounds and their derivatives.
2(0,0,0,2) Details
3138787 Costa AK, Trudell JR: Toxicity of 1,2-dibromoethane in primary hepatocyte monolayer cultures: lack of dependence on oxygen concentration. Toxicol Appl Pharmacol. 1988 Sep 15;95(2):241-7.


Hepatic 1,2-dibromoethane (DBE) metabolism proceeds via two pathways: oxidation by cytochrome P-450 and direct conjugation with the ubiquitous tripeptide glutathione (GSH) via the GSH S-transferases.
1(0,0,0,1) Details
2405459 Alexeeff GV, Kilgore WW, Li MY: Ethylene dibromide: toxicology and risk assessment. Rev Environ Contam Toxicol. 1990;112:49-122.

It appears to be metabolized in vivo by an oxidative pathway (cytochrome P-450) and a conjugation pathway (glutathione S-transferase).
1(0,0,0,1) Details
2134669 Guengerich FP, Humphreys WG, Kim DH, Oida T, Cmarik JL: DNA-glutathione adducts derived from vic-dihaloalkanes: mechanisms of mutagenesis. Princess Takamatsu Symp. 1990;21:101-7.

The conjugation of the prototype dihaloalkane ethylene dibromide (EDB) with glutathione (GSH) yields S-(2-bromoethyl) GSH, which gives rise to S-[2-(N7-guanyl) ethyl] GSH as the major DNA adduct (greater than or equal to 95%).
Enhancement of GSH conjugation or inhibition of cytochrome P-450 IIE1 oxidation enhances DNA adduct levels in vivo and GSH depletion lowers levels.
1(0,0,0,1) Details
1898041 Warren DL, Reed DJ: Modification of hepatic vitamin E stores in vivo. Arch Biochem Biophys. 1991 Aug 1;288(2):449-55.


Vitamin E depletion may be dependent upon initial steps of DBE metabolism that are either oxidative (cytochrome P450 dependent) or conjugative (glutathione transferase dependent).
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1592216 Kulkarni AP, Edwards J, Richards IS: Metabolism of 1,2-dibromoethane in the human fetal liver. . Gen Pharmacol. 1992 Jan;23(1):1-5.


A significant bioactivation with a possibility of only limited detoxication via cytochrome P-450-dependent oxidation suggests that human fetus may be at greater risk from 1,2-dibromoethane toxicity than adult.
1(0,0,0,1) Details
6380963 Rush GF, Smith JH, Newton JF, Hook JB: Chemically induced nephrotoxicity: role of metabolic activation. . Crit Rev Toxicol. 1984;13(2):99-160.


Kidney cortex contains a cytochrome P-450 system while medulla contains a prostaglandin endoperoxidase.
1(0,0,0,1) Details
1636057 Danni O, Aragno M, Tamagno E, Ugazio G: In vivo studies on halogen compound interactions. Res Commun Chem Pathol Pharmacol. 1992 Jun;76(3):355-66.


TCBM, like CT, reduces the hepatic level of GSH-S-transferase, increasing the amount of DBE available for cytochrome P450-dependent metabolism, with the production of toxic metabolites.
1(0,0,0,1) Details
6761902 Moody DE, Clawson GA, Woo CH, Smuckler EA: Cellular distribution of cytochrome P-450 loss in rats of different ages treated with alkyl halides. Toxicol Appl Pharmacol. 1982 Nov;66(2):278-89.

1(0,0,0,1) Details
2311185 Kim DH, Guengerich FP: Formation of the DNA adduct S-[2-(N7-guanyl) ethyl] glutathione from ethylene dibromide: effects of modulation of glutathione and glutathione S-transferase levels and lack of a role for sulfation. Carcinogenesis. 1990 Mar;11(3):419-24.

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