Abstract：
:Changes in the rate of DNA synthesis in spermatogenic cells after treatment of segments of rat seminiferous tubule at defined stages of epithelial cycle with benzo[a]pyrene (BP) or 7,12-methylbenz[a]anthracene (DMBA) were studied. The incorporation of labeled thymidine into DNA was used as a measure of the rate of DNA synthesis. Very little or no inhibition of DNA synthesis at stages V and VIII of the cycle was observed at BP and DMBA concentrations lower than 100 microM. In contrast, in the presence of added mitochondria and/or microsomes from whole rat testis, 20 microM BP or DMBA inhibited DNA synthesis 5% and 80%, respectively. This inhibition of DNA synthesis was prevented by inhibitors of the cytochrome P-450 system and by free radical scavengers. These results suggest that polycyclic aromatic hydrocarbons (PAH) require metabolic activation in order to inhibit DNA replication in seminiferous tubules. The first step of this biotransformation is cytochrome P-450-dependent and occurs in Leydig cells. However, the metabolites produced in this step may be further metabolized to reactive metabolites by peroxidative pathways in the seminiferous tubules; these latter products may affect DNA replication.
journal_name
Chem Biol Interactjournal_title
Chemico-biological interactionsauthors
Georgellis A,Parvinen M,Rydström Jdoi
10.1016/0009-2797(89)90019-7subject
Has Abstractpub_date
1989-01-01 00:00:00pages
79-92issue
1-2eissn
0009-2797issn
1872-7786pii
0009-2797(89)90019-7journal_volume
72pub_type
杂志文章abstract：:Overactivation of N-methyl-D-aspartate (NMDA) receptors has been associated with neurodegenerative disorders such as Alzheimer's disease (AD), cerebral vascular disorders and amyotrophic lateral sclerosis (ALS). We have previously designed and synthesized a series of memantine nitrate and some of them have shown vesse...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2020.109020
更新日期：2020-07-01 00:00:00
abstract：:Nephrotoxicity is a major adverse effect of chromium poisoning. In the present study, we investigated the potential renoprotective effect and underlying mechanisms of carvedilol, a non-specific β-adrenergic blocker using rat model of potassium dichromate-induced nephrotoxicity. Rats were pretreated with carvedilol (10...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2014.09.009
更新日期：2014-11-05 00:00:00
abstract：:The functional genetic polymorphism of aldehyde dehydrogenase 2 (ALDH2) influences the enzymatic activities of its wild type (Glu504 encoded by ALDH2*1) and mutant type (Lys504 encoded by ALDH2*2) proteins. The enzymatic activities of mutant-type ALDH2 are limited compared with those of the wild type. ALDH2 has been s...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2017.03.012
更新日期：2017-10-01 00:00:00
abstract：:Aspirin is one of the oldest drugs and has been purported to have multiple beneficial effects, including prevention of cardiovascular disease and cancer, in addition to its original indication for treatment of inflammation, fever and pain. In cancer chemoprevention studies using animal models, two methods of aspirin a...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2008.10.008
更新日期：2009-05-15 00:00:00
abstract：:The antitumor agent cis-diamminedichloroplatinum(II) (cis-DDP) reacts covalently with DNA and disrupts its secondary structure. Damaged DNA, but not native DNA, is readily digested by S1 nuclease, an endonuclease specific for single stranded polynucleotides. We have measured S1 nuclease digestion of platinated DNA by ...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/0009-2797(90)90003-6
更新日期：1990-01-01 00:00:00
abstract：:Dimethylnitrosamine (DMN) is a potent hepatotoxic, carcinogenic and mutagenic compound. It induces massive liver cell necrosis and death in experimental animals. Several drugs have been tested in the past for their protective behavior against DMN toxicity. However, it is for the first time that therapeutic interventio...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2017.10.009
更新日期：2018-11-01 00:00:00
abstract：:In cancer, a high flux of oxidants not only depletes the cellular thiols, but damages the whole cell as well. Epidemiological studies suggest green tea may mitigate cancers in human and animal models for which several mechanisms have been proposed. In the present investigation, the levels of cellular thiols such as re...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2004.06.006
更新日期：2004-10-15 00:00:00
abstract：:Methylglyoxal (MGO), a cytotoxic metabolite, is produced from glycolysis. Elevated levels of MGO are observed in a number of diabetic complications, including retinopathy, nephropathy and cardiomyopathy. Loss of retinal pericyte, a hallmark of early diabetic retinal changes, leads to the development of formation of mi...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2010.07.002
更新日期：2010-10-06 00:00:00
abstract：:The stability of small unilamellar vesicles formed by egg phosphatidylcholine has been examined in the presence of 38 tricyclic carboxamide DNA-intercalating agents (19 phenylquinolines, 17 phenylbenzimidazoles, an acridine and an anthracene). Lysis of the vesicular membrane is time-dependent and also dependent on the...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/0009-2797(90)90025-i
更新日期：1990-01-01 00:00:00
abstract：:It has been detected that hepatic adenosine A(2A) receptors play an active role in the pathogenesis of hepatic fibrosis and suggest a novel therapeutic target in the treatment and prevention of hepatic cirrhosis. In this paper we examined if our new triazine derivative (IMT) can inhibit ethanol-induced activation of H...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2011.10.004
更新日期：2012-01-05 00:00:00
abstract：:There is growing interest in studying the toxicity and health risk of exposure to multi-pollutant mixtures found in ambient air, and the U.S. Environmental Protection Agency (EPA) is moving towards setting standards for these types of mixtures. Additionally, the Health Effects Institute's strategic plan aims to develo...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2014.06.026
更新日期：2014-09-05 00:00:00
abstract：:Neutrophils from asymptomatic HIV-infected patients have an increased Nitroblue tetrazolium (NBT) reduction, that is an increased production of oxygen radicals. Plasma from these patients can activate normal neutrophils to an increased NBT-reduction and the neutrophil activating factor thus seems to be mainly plasma b...
journal_title：Chemico-biological interactions
pub_type： 杂志文章,评审
doi：10.1016/0009-2797(94)90034-5
更新日期：1994-06-01 00:00:00
abstract：:Studies suggest iron overload may cause bone lesion. The mechanisms are not well understood at present. Therefore, this study was designed to observe the effect of iron overload on bone metabolism in young male rats and explore its possible mechanism. Eighteen SD rats were randomly assigned to iron-loading and control...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2017.11.005
更新日期：2018-01-05 00:00:00
abstract：:Colon epithelium is made up of two general classes of cells, surface cells which are post-mitotic and crypt cells which contain the proliferative population. Their relative vulnerability to environmental damage and ability to perform DNA repair are important issues in colon carcinogenesis. DNA damage and repair was st...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/0009-2797(85)90026-2
更新日期：1985-01-01 00:00:00
abstract：:The reduction of hexavalent chromium (Cr(VI] by rat liver microsomes was studied. With 15-120 microM Na2CrO4 microsomes (0.5 mg protein/ml) effectively reduced Cr(VI) in the presence of NADPH provided anaerobic conditions. Phenobarbital (PB) and Aroclor 1254 (PCB) pretreatment increased microsomal Cr(VI) reduction whi...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/0009-2797(89)90076-8
更新日期：1989-01-01 00:00:00
abstract：:Human 17β-hydroxysteroid dehydrogenase (17β-HSD) type 1 is an enzyme that acts at the pre-receptor level. It catalyzes the NADPH-dependent reduction of the weak estrogen estrone into the most potent estrogen 17β-estradiol, which exerts proliferative effects via estrogen receptors. Overexpression of 17β-HSD type 1 in e...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2011.01.002
更新日期：2011-05-30 00:00:00
abstract：:The dietary exposure of rats to cadmium (75 ppm) for periods of up to 48 weeks caused an accumulation of cadmium in the femur, and an inhibition of the accumulation of zinc in the bone. After 48 weeks of cadmium treatment, there was a decreased activity of alkaline phosphatase in the femur. This effect was prevented b...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/0009-2797(80)90155-6
更新日期：1980-03-01 00:00:00
abstract：:This paper assesses the current knowledge of 1,3-butadiene as an atmospheric pollutant, considers measurement techniques and reviews available data on 1,3-butadiene monitoring and emissions estimates. Atmospheric chemistry, sources of emission, current legislation, measurement techniques and monitoring programmes for ...
journal_title：Chemico-biological interactions
pub_type： 杂志文章,评审
doi：10.1016/s0009-2797(01)00190-9
更新日期：2001-06-01 00:00:00
abstract：:tert-Butylhydroquinone (BHQ), an antioxidant used as a food additive, exhibits an anticancer effect at low doses, but is carcinogenic in rodents at high doses. BHQ is metabolized into cytotoxic tert-butylquinone (TBQ), which is further converted to 6-tert-butyl-2,3-epoxy-4-hydroxy-5-cyclohexen-1-one (TBEH) through 6-t...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2014.09.023
更新日期：2015-06-05 00:00:00
abstract：:There are global increased interests to identify novel agents that can possess anti-tumor effects or maximize the anti-tumor effects of low doses for conventional anti-cancer drugs. The aim of this study was to investigate anti-tumor effects and protective role of isolated hesperidin from sweet orange on doxorubicin-i...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2018.02.029
更新日期：2018-04-01 00:00:00
abstract：:Studies were undertaken to investigate the mechanism of bioactivation and covalent binding of TNT. Incubation of [14C]TNT with rat liver microsomes in the presence of an NADPH generating system resulted in metabolism and covalent binding to microsomal proteins. Time-dependence studies showed that TNT was rapidly reduc...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/0009-2797(94)03606-9
更新日期：1995-06-30 00:00:00
abstract：:Oxcarbazepine, a second generation antiepileptic drug belonging to the family of dibenz[b,f]azepines, is subjected to a rapid and extensive biotransformation. Oxcarbazepine demonstrates a low potential for drug interactions because its biotransformation is mainly mediated by the reduction pathway instead of oxidative ...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2014.07.005
更新日期：2014-09-05 00:00:00
abstract：:An assay of gamma-glutamylcysteine synthetase (gamma-GCS) and glutathione synthetase (GS) in crude extracts of cultured cells and tissues is described. It represents a novel combination of known methods, and is based on the formation of glutathione (GSH) from cysteine, glutamate and glycine in the presence of rat kidn...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/s0009-2797(02)00017-0
更新日期：2002-04-20 00:00:00
abstract：:Human blood monocyte carboxylesterase (CBE) is inhibited by a variety of organophosphorus compounds including arylphosphates and arylphosphites and some alkylphosphites. Triphenyl phosphate and triphenyl phosphite with Ki values of 8 x 10(-9) M and 4.8 x 10(-8) M, respectively, are the most potent inhibitors of this e...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/0009-2797(91)90092-l
更新日期：1991-01-01 00:00:00
abstract：:The clinical use of doxorubicin is associated with dose limiting cardiotoxicity. This is a manifestation of free radical production triggered by doxorubicin. Therefore, we evaluated the efficacy of febuxostat, a xanthine oxidase inhibitor and antioxidant, in blocking cardiotoxicity associated with doxorubicin in rats....
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2015.05.013
更新日期：2015-07-25 00:00:00
abstract：:The microsomal metabolism of pentachlorophenol (PCP) was investigated, with special attention to the conversion dependent covalent binding to protein and DNA. The two metabolites detected were tetrachloro-1,2- and tetrachloro-1,4-hydroquinone. Microsomes from isosafrole (ISF)-induced rats were by far the most effectiv...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/0009-2797(86)90013-x
更新日期：1986-10-15 00:00:00
abstract：:Type 1 diabetes (T1D) also known as juvenile diabetes is a chronic autoimmune disorder that precipitates in genetically susceptible individuals by environmental factors particularly during early age. Both genetic and epigenetic factors are implicated in the beta-cell development, proliferation, differentiation and fun...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2014.02.001
更新日期：2014-04-25 00:00:00
abstract：:Passive paracellular absorption, regulated by tight junctions (TJs), is the main route for absorption of poorly absorbed hydrophilic substances. Surface active substances, such as fatty acids, may enhance absorption of these substances by affecting the integrity of TJ and increasing the permeability. It has been sugge...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2009.06.016
更新日期：2009-10-07 00:00:00
abstract：:Acetylcholinesterase (AChE) terminates cholinergic neurotransmission by hydrolyzing acetylcholine. The collagen-tailed AChE tetramer is a product of 2 genes, ACHE and ColQ. The AChE tetramer consists of 4 identical AChE subunits and one polyproline-rich peptide, whose function is to hold the 4 AChE subunits together. ...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2020.109007
更新日期：2020-03-01 00:00:00
abstract：:In order to assess the role played respectively by the pseudothiourea group and the alkylic chain in the inhibition of protein synthesis and tumour growth caused by compound AHR-1911, a series of eight related substances were studied. The blockade of protein synthesis on liver and Walker carcinoma ribosomes and on sus...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/0009-2797(78)90135-7
更新日期：1978-09-01 00:00:00
