Protein Information

Name CYP1A1
Synonyms AHH; AHRR; Arylhydrocarbon hydroxylase; CP11; CYP 1; CYP1; CYP1A1; CYPIA 1…

Compound Information

Name chlorpyrifos
CAS

Reference List

PubMed Abstract RScore(About this table)
19326769 Das PC, Cao Y, Roset RL, Cherrington N, Hodgson E: Enzyme induction and cytotoxicity in human hepatocytes by chlorpyrifos and N,N-diethyl-m-toluamide (DEET). Drug Metabol Drug Interact. 2008;23(3-4):237-60.

Chlorpyrifos and DEET also mediated the expression of CYP isoforms, particularly CYP3A4, CYP2B6 and CYP1A1, as shown by CYP3A4-specific protein expression, testosterone metabolism and CYP1Al-specific activity assays.
87(1,1,2,2) Details
20183062 Abass K, Turpeinen M, Pelkonen O: An evaluation of the cytochrome P450 inhibition potential of selected pesticides in human hepatic microsomes. J Environ Sci Health B. 2009 Aug;44(6):553-63.

Generally organophosphorus insecticides were the most potent and extensive inhibitors, especially towards CYP1A1/2 (IC (50) values of chlorpyrifos, fenitrothion and profenofos approximately 3 micro M), CYP2B6 (IC (50) values of chlorpyrifos and fenitrothion 2.5 micro M), CYP2C8 (fenitrothion 4.3 micro M), CYP2C9 (fenitrothion and malathion 4.8 and 2.5 micro M, respectively), CYP2D6 (chlorpyrifos and phenthoate approximately 3 micro M) and CYP3A4 (chlorpyrifos, fenitrothion and phenthoate 3-4 micro M).
32(0,1,1,2) Details
20035023 Ellero S, Chakhtoura G, Barreau C, Langouet S, Benelli C, Penicaud L, Beaune P, de Waziers I: Xenobiotic-metabolizing cytochromes p450 in human white adipose tissue: expression and induction. Drug Metab Dispos. 2010 Apr;38(4):679-86. Epub 2009 Dec 24.

The WAT and liver models were then treated with typical P450 inducers (rifampicin, phenobarbital, and 2,3,7,8-tetrachlorodibenzo-p-dioxin) and lipophilic pollutants (lindane, prochloraz, and chlorpyrifos), and the effects on P450 expression were studied.
P450 expression was considerably lower in WAT than in the liver, except for CYP1B1 and CYP2U1, which were the most highly expressed adipose P450s in all individuals. 2,3,7,8-Tetrachlorodibenzo-p-dioxin and prochloraz induced CYP1A1 and CYP1B1 expression in both tissues.
1(0,0,0,1) Details
18835618 Takeuchi S, Iida M, Yabushita H, Matsuda T, Kojima H: In vitro screening for aryl hydrocarbon receptor agonistic activity in 200 pesticides using a highly sensitive reporter cell line, DR-EcoScreen cells, and in vivo mouse liver cytochrome P450-1A induction by propanil, diuron and linuron. Chemosphere. 2008 Dec;74(1):155-65. Epub 2008 Oct 5.

Eleven of the 200 pesticides (acifluorfen-methyl, bifenox, chlorpyrifos, isoxathion, quinalphos, chlorpropham, diethofencarb, propanil, diuron, linuron, and prochloraz) showed AhR-mediated transcriptional activity.
To investigate the in vivo effects, we examined the gene expression of AhR-inducible cytochrome P450 1As (CYP1As) in the liver of female C57BL/6 mice intraperitoneally injected with these three herbicides (300 mg kg (-1)) by quantitative RT-PCR, resulting in induction of significant high levels of CYP1A1 and CYP1A2 mRNAs.
1(0,0,0,1) Details
12385721 Tang J, Cao Y, Rose RL, Hodgson E: In vitro metabolism of carbaryl by human cytochrome P450 and its inhibition by chlorpyrifos. Chem Biol Interact. 2002 Oct 20;141(3):229-41.

CYP1A1 and 1A2 had the greatest ability to form 5-hydroxycarbaryl, while CYP3A4 and CYP1A1 were the most active in generation of 4-hydroxycarbaryl.
1(0,0,0,1) Details