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Toxic substance mechanisms最新文献

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Adverse health consequences of cigarette smoking also include drug interactions 吸烟的不良健康后果还包括药物相互作用
Toxic substance mechanisms Pub Date : 1997-02-11 DOI: 10.1080/107691897229829
L. Knodel
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引用次数: 0
STUDIES ON THE REC EFFECTS OF CHROMIUM(VI) COMPOUNDS IN BACILLUS SUBTILIS 铬(vi)化合物在枯草芽孢杆菌中的抑菌作用研究
Toxic substance mechanisms Pub Date : 1997-01-01 DOI: 10.1080/107691897229784
R. C. S. Obti, M. Kaushal, A. Kaushal
{"title":"STUDIES ON THE REC EFFECTS OF CHROMIUM(VI) COMPOUNDS IN BACILLUS SUBTILIS","authors":"R. C. S. Obti, M. Kaushal, A. Kaushal","doi":"10.1080/107691897229784","DOIUrl":"https://doi.org/10.1080/107691897229784","url":null,"abstract":"Bacterial systems are subjected to cellular repair of different types. A recombination (rec) repair test applied to chemicals/ carcinogens produces positive results in the rec assay. Two chromium com pounds, chromium trioxide (CrO3, MW 100.01) and potassium dichrom ate (K2Cr2O7, MW 294.21) have been subjected to rec assay. The rec effect was greater with K2Cr2O7 than with CrO3. The S9 metabolic activation mixture had a detoxifying effect for both the compounds.","PeriodicalId":87425,"journal":{"name":"Toxic substance mechanisms","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88586380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
INTERACTION OF AFLATOXINS AS MEASURED BY THEIR BIOCHEMICAL ACTION ON RAT LIVER SLICES AND HEPATOCYTES 黄曲霉毒素对大鼠肝切片和肝细胞的生化作用
Toxic substance mechanisms Pub Date : 1997-01-01 DOI: 10.1080/107691897229775
L. Friedman, D. Gaines, R. Chi, Matthew C Smith, R. Braunberg, C. Thorpe
{"title":"INTERACTION OF AFLATOXINS AS MEASURED BY THEIR BIOCHEMICAL ACTION ON RAT LIVER SLICES AND HEPATOCYTES","authors":"L. Friedman, D. Gaines, R. Chi, Matthew C Smith, R. Braunberg, C. Thorpe","doi":"10.1080/107691897229775","DOIUrl":"https://doi.org/10.1080/107691897229775","url":null,"abstract":"The possible interaction between pairs of aflatoxins com monly occurring together in foods was evaluated by determining their biochem ical actions on the liver and hepatocytes of young mature rats. RNA synthesis, a sensitive and 14 early target of the effects of aflatoxin B1, was m easured with [ C]orotic acid or 3 [ H]uridine used as substrates. In the first study (comprised of four replicate experiments), liver slices treated with aflatoxin B1 at 0, 120, 240, and 480 ng/ ml were incubated in the presence and absence of aflatoxin B2 at 120 ng/ ml. In the second study, liver slices were treated with the sam e concentrations of B1 incubated in the presence and absence of aflatoxin G1 at 120 ng/ m l (comprised of four replicate experim ents) or at 240 ng/ ml (comprised of two replicate experim ents). In the third study (single experim ent), isolated hepatocytes were treated with aflatoxin B1 at 0, 60, 120, 240, and 480 ng/ ml in the presence and absence of aflatoxin G1 at 120 ng/ m l. Leakage of lactic acid...","PeriodicalId":87425,"journal":{"name":"Toxic substance mechanisms","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85682429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
CARCINOGENIC CHROMIUM(VI) INDUCES OXIDATIVE STRESS IN CULTURED HUMAN LEUKEMIC T-LYMPHOCYTES. 1. GENERATIO OF HYDROGEN PEROXIDE DURIN INTRACELLULAR REDUCTION OF CHROMATE 致癌铬(vi)诱导培养的人白血病t淋巴细胞氧化应激。1. 细胞内铬酸盐还原过程中过氧化氢的产生
Toxic substance mechanisms Pub Date : 1997-01-01 DOI: 10.1080/107691897229801
S. Mattagajasingh, H. Misra
{"title":"CARCINOGENIC CHROMIUM(VI) INDUCES OXIDATIVE STRESS IN CULTURED HUMAN LEUKEMIC T-LYMPHOCYTES. 1. GENERATIO OF HYDROGEN PEROXIDE DURIN INTRACELLULAR REDUCTION OF CHROMATE","authors":"S. Mattagajasingh, H. Misra","doi":"10.1080/107691897229801","DOIUrl":"https://doi.org/10.1080/107691897229801","url":null,"abstract":"Treatment of human leukemic T-lymphocyte MOLT4 cells with potassium chromate, a chromium (VI) compound, increased the form ation of the oxidized compound dichlorofluorescein (DCF), a highly fluorescent compound, from the parent nonfluorescent compound, 2,7-dichlorofluorescin diacetate (DCF-DA). No such increase in DCF formation was observed when cells were treated with Cr(III) compounds. In cell-free system s, dichlorofluorescin diacetate was also oxidized to DCF by strong oxidants (such as hydrogen peroxide and hydroperoxides) in the presence of peroxidase, suggesting that Cr(VI) treatment increased the intracellular level of these peroxides in MOLT4 cells. The rate of generation of peroxides was found to be both dose and time dependent. These results suggest that accumulation of intracellular peroxides may, at least in part, be associated with chromium-induced genotoxicity and add to the emerging concept that these phenomena may, in part, be mediated via oxidative m echanisms.","PeriodicalId":87425,"journal":{"name":"Toxic substance mechanisms","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77998204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
MECHANISTIC STUDIES ON PHOTOTOXICITY INDUCED BY ANTIBACTERIAL QUINOLONES 抗菌喹诺酮类药物致光毒性机理研究
Toxic substance mechanisms Pub Date : 1997-01-01 DOI: 10.1080/107691897229810
F. Vargas, C. Rivas
{"title":"MECHANISTIC STUDIES ON PHOTOTOXICITY INDUCED BY ANTIBACTERIAL QUINOLONES","authors":"F. Vargas, C. Rivas","doi":"10.1080/107691897229810","DOIUrl":"https://doi.org/10.1080/107691897229810","url":null,"abstract":"Recent research on elucidation of mechanisms of the phototoxic activities of various pharmaceutical products currently being investigated in this laboratory is reviewed. Due to the importance of antibacterial quinolones of com mon use in present m edical practice, it is considered of general interest to summ arize the photochem ical reactions involved in the generation of active photoproducts and the possibility of metabolite mediation in biological damage. Thus, m echanism s are postulated for the photochemical decomposition of the substances investigated as well as the possible in vitro m echanism involved at cellular level.","PeriodicalId":87425,"journal":{"name":"Toxic substance mechanisms","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75915848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
INHIBITION BY LITHIUM OF GENTAMICININDUCED RELEASE OF N-ACETYL--DGLUCOSAMINIDASE IN ISOLATED PERFUSED RAT KIDNEY 锂对庆大霉素诱导的离体大鼠肾脏n -乙酰氨基葡萄糖苷酶释放的抑制作用
Toxic substance mechanisms Pub Date : 1997-01-01 DOI: 10.1080/107691897229766
M. Djamali, M. Shahrokhi
{"title":"INHIBITION BY LITHIUM OF GENTAMICININDUCED RELEASE OF N-ACETYL--DGLUCOSAMINIDASE IN ISOLATED PERFUSED RAT KIDNEY","authors":"M. Djamali, M. Shahrokhi","doi":"10.1080/107691897229766","DOIUrl":"https://doi.org/10.1080/107691897229766","url":null,"abstract":"N-Acetyl--d-glucosaminidase (NAG) is one of the sensitive hydrolytic lysosomal enzymes that is released after renal tubular damage. We have studied gentamicin-induced nephrotoxicity by determining the NAG release in a perfused rat kidney model. Gentamicin at 100 ug/ml caused a time-dependent increase in enzymuria. The effect of pretreatment with 5 or 10 mmol/kg of lithium chloride, administered subcutaneously 24 h prior to perfusion with gentamicin, was also studied through the measurement of NAG activity. Lithium at 5 mmol/kg absolutely inhibited NAG release; 10 mmol/kg lithium significantly diminished the release of enzyme. The inhibitory effect of 5 mmol/kg of lithium may be due to its interference with phosphoinositide cycle in renal tubular lysosomal membrane.","PeriodicalId":87425,"journal":{"name":"Toxic substance mechanisms","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86919093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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