Biomaterial Database

Testicular toxicity of Di(2-ethylhexyl)phthalate in developing rats. 1995

D Parmar, and S P Srivastava, and G B Singh, and P K Seth

Industrial Toxicology Research Centre, Lucknow, India.

To understand the factors involved in the enhanced testicular toxicity of di(2-ethylhexyl)phthalate (DEHP) in developing animals, po doses of 50, 100, 250 or 500 mg DEHP/kg were administered to 25-d-old albino rats for 30 consecutive days. Activities of testicular and hepatic cytochrome P-450 enzymes were determined. A dose-dependent increase in the activities of lactate dehydrogenase and gamma-glutamyl transpeptidase and a decrease in sorbitol dehydrogenase was observed in the testes. The activity of beta-glucuronidase increased at dosages of 250 and 500 mg/kg, while acid phosphatase decreased. Testes had marked destructive changes in the advanced germ cell layers at dosages of 250 and 500 mg/kg, which supports biochemical studies indicating that DEHP interacts with the maturation process of the testes. The dose-dependent decrease in hepatic cytochrome P-450 levels and the activities of ethylmorphine N-demethylase and aniline hydroxylase suggest that impaired metabolism of DEHP could lead to higher amounts of the diester or its metabolites reaching the testes; this may result in enhanced vulnerability of the testes to DEHP in developing animals.

UI	MeSH Term	Description	Entries
D007064	L-Iditol 2-Dehydrogenase	An alcohol oxidoreductase which catalyzes the oxidation of L-iditol to L-sorbose in the presence of NAD. It also acts on D-glucitol to form D-fructose. It also acts on other closely related sugar alcohols to form the corresponding sugar. EC 1.1.1.14	Iditol Dehydrogenase,Sorbitol Dehydrogenase,Polyol Dehydrogenase,2-Dehydrogenase, L-Iditol,Dehydrogenase, Iditol,Dehydrogenase, Polyol,Dehydrogenase, Sorbitol,L Iditol 2 Dehydrogenase
D007527	Isoenzymes	Structurally related forms of an enzyme. Each isoenzyme has the same mechanism and classification, but differs in its chemical, physical, or immunological characteristics.	Alloenzyme,Allozyme,Isoenzyme,Isozyme,Isozymes,Alloenzymes,Allozymes
D007770	L-Lactate Dehydrogenase	A tetrameric enzyme that, along with the coenzyme NAD+, catalyzes the interconversion of LACTATE and PYRUVATE. In vertebrates, genes for three different subunits (LDH-A, LDH-B and LDH-C) exist.	Lactate Dehydrogenase,Dehydrogenase, L-Lactate,Dehydrogenase, Lactate,L Lactate Dehydrogenase
D008099	Liver	A large lobed glandular organ in the abdomen of vertebrates that is responsible for detoxification, metabolism, synthesis and storage of various substances.	Livers
D008297	Male		Males
D009929	Organ Size	The measurement of an organ in volume, mass, or heaviness.	Organ Volume,Organ Weight,Size, Organ,Weight, Organ
D003577	Cytochrome P-450 Enzyme System	A superfamily of hundreds of closely related HEMEPROTEINS found throughout the phylogenetic spectrum, from animals, plants, fungi, to bacteria. They include numerous complex monooxygenases (MIXED FUNCTION OXYGENASES). In animals, these P-450 enzymes serve two major functions: (1) biosynthesis of steroids, fatty acids, and bile acids; (2) metabolism of endogenous and a wide variety of exogenous substrates, such as toxins and drugs (BIOTRANSFORMATION). They are classified, according to their sequence similarities rather than functions, into CYP gene families (>40% homology) and subfamilies (>59% homology). For example, enzymes from the CYP1, CYP2, and CYP3 gene families are responsible for most drug metabolism.	Cytochrome P-450,Cytochrome P-450 Enzyme,Cytochrome P-450-Dependent Monooxygenase,P-450 Enzyme,P450 Enzyme,CYP450 Family,CYP450 Superfamily,Cytochrome P-450 Enzymes,Cytochrome P-450 Families,Cytochrome P-450 Monooxygenase,Cytochrome P-450 Oxygenase,Cytochrome P-450 Superfamily,Cytochrome P450,Cytochrome P450 Superfamily,Cytochrome p450 Families,P-450 Enzymes,P450 Enzymes,Cytochrome P 450,Cytochrome P 450 Dependent Monooxygenase,Cytochrome P 450 Enzyme,Cytochrome P 450 Enzyme System,Cytochrome P 450 Enzymes,Cytochrome P 450 Families,Cytochrome P 450 Monooxygenase,Cytochrome P 450 Oxygenase,Cytochrome P 450 Superfamily,Enzyme, Cytochrome P-450,Enzyme, P-450,Enzyme, P450,Enzymes, Cytochrome P-450,Enzymes, P-450,Enzymes, P450,Monooxygenase, Cytochrome P-450,Monooxygenase, Cytochrome P-450-Dependent,P 450 Enzyme,P 450 Enzymes,P-450 Enzyme, Cytochrome,P-450 Enzymes, Cytochrome,Superfamily, CYP450,Superfamily, Cytochrome P-450,Superfamily, Cytochrome P450
D004051	Diethylhexyl Phthalate	An ester of phthalic acid. It appears as a light-colored, odorless liquid and is used as a plasticizer for many resins and elastomers.	Dioctyl Phthalate,Bis(2-ethylhexyl)phthalate,DEHP,Di(2-ethylhexyl)phthalate,Di-2-Ethylhexylphthalate,Di 2 Ethylhexylphthalate,Phthalate, Diethylhexyl,Phthalate, Dioctyl
D004305	Dose-Response Relationship, Drug	The relationship between the dose of an administered drug and the response of the organism to the drug.	Dose Response Relationship, Drug,Dose-Response Relationships, Drug,Drug Dose-Response Relationship,Drug Dose-Response Relationships,Relationship, Drug Dose-Response,Relationships, Drug Dose-Response
D005037	Ethylmorphine-N-Demethylase	A drug-metabolizing enzyme of the hepatic microsomal oxidase system which catalyzes the oxidation of the N-methyl group of ethylmorphine with the formation of formaldehyde.	Ethylmorphine N Demethylase,Demethylase, Ethylmorphine N,N Demethylase, Ethylmorphine