Fundamental and applied toxicology : official journal of the Society of Toxicology最新文献

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Mesothelial cell proliferation and biopersistence of wollastonite and crocidolite asbestos fibers. 硅灰石和青橄榄石石棉纤维间皮细胞的增殖和生物持久性。
J. Macdonald, A. Kane
{"title":"Mesothelial cell proliferation and biopersistence of wollastonite and crocidolite asbestos fibers.","authors":"J. Macdonald, A. Kane","doi":"10.1093/TOXSCI/38.2.173","DOIUrl":"https://doi.org/10.1093/TOXSCI/38.2.173","url":null,"abstract":"The mesothelial lining is a target for the fibrotic and carcinogenic effects of mineral fibers. Fiber geometry, dimensions, chemical composition, surface reactivity, and biopersistence at the target tissue have been proposed to contribute to these toxic endpoints. We established a dose-response relationship between the number of fibers delivered to the parietal peritoneal lining, inflammation, and mesothelial cell proliferation induced by intraperitoneal injection of crocidolite asbestos fibers in mice. Persistence of these inflammatory and proliferative responses depended on persistence of fibers at the target tissue. Intraperitoneal injection of wollastonite fibers induced an early inflammatory and proliferative response that subsided after 21 days. Approximately 50% of wollastonite fibers were recovered by bleach digestion after 21 days and only 2% were recovered after 6 months. In contrast, the number of fibers recovered from tissue digests had not declined 6 months after injection of crocidolite asbestos. These results support the hypothesis that biopersistent fibers cause persistent inflammation and chronic mesothelial cell proliferation.","PeriodicalId":12658,"journal":{"name":"Fundamental and applied toxicology : official journal of the Society of Toxicology","volume":"20 1","pages":"173-83"},"PeriodicalIF":0.0,"publicationDate":"1997-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81310619","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: 19
Cephaloridine in vitro toxicity and accumulation in renal slices from normoglycemic and diabetic rats. 头孢啶在正常血糖和糖尿病大鼠肾片中的体外毒性和蓄积。
M Valentovic, J G Ball, B A Rogers, M K Meadows, R C Harmon, J Moles
{"title":"Cephaloridine in vitro toxicity and accumulation in renal slices from normoglycemic and diabetic rats.","authors":"M Valentovic,&nbsp;J G Ball,&nbsp;B A Rogers,&nbsp;M K Meadows,&nbsp;R C Harmon,&nbsp;J Moles","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Previous work has shown a reduction in cephaloridine nephrotoxicity in a diabetic rat model. The following studies examined in vitro cephaloridine toxicity in renal slices from normoglycemic and diabetic Fischer 344 rats. Diabetes was induced by acute intraperitoneal injection of 35 mg/kg streptozotocin. Renal cortical slices were isolated from normoglycemic and diabetic animals. Tissues were exposed to 0-5 mM cephaloridine for 15-120 min. Pyruvate-directed gluconeogenesis was diminished in all groups exposed to 2-5 mM cephaloridine for 60-120 min. Leakage of lactate dehydrogenase (LDH) was apparent only in the normoglycemic group in the presence of 4-5 mM cephaloridine for 120 min. LDH leakage was not increased at any cephaloridine concentration in the diabetic tissue. Total glutathione levels were compared in renal cortical slices exposed to cephaloridine for 30-120 min. Baseline values for glutathione were comparable between normoglycemic and diabetic tissue suggesting that the mechanism for reduced toxicity was not due to higher glutathione levels in diabetic tissue. Total glutathione levels were diminished more rapidly in normoglycemic than diabetic tissue by incubation with 5 mM cephaloridine. Comparison of cephaloridine accumulation indicated that diabetic tissue accumulated less cephaloridine than the normoglycemic group when tissues were incubated with 0-2 mM cephaloridine. However, renal slice accumulation was similar between normoglycemic and diabetic groups following in vitro incubation with 4-5 mM cephaloridine. These results suggest that the mechanism for reduced in vitro cephaloridine toxicity in diabetic tissue cannot be limited to differences in accumulation and must include an unidentified cellular component.</p>","PeriodicalId":12658,"journal":{"name":"Fundamental and applied toxicology : official journal of the Society of Toxicology","volume":"38 2","pages":"184-90"},"PeriodicalIF":0.0,"publicationDate":"1997-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20239803","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
Short-term exposure to diesel exhaust induces nasal mucosal hyperresponsiveness to histamine in guinea pigs. 短期暴露于柴油废气诱导豚鼠鼻黏膜对组胺的高反应性。
T. Kobayashi, T. Ikeue, T. Ito, A. Ikeda, M. Murakami, A. Kato, K. Maejima, T. Nakajima, T. Suzuki
{"title":"Short-term exposure to diesel exhaust induces nasal mucosal hyperresponsiveness to histamine in guinea pigs.","authors":"T. Kobayashi, T. Ikeue, T. Ito, A. Ikeda, M. Murakami, A. Kato, K. Maejima, T. Nakajima, T. Suzuki","doi":"10.1093/TOXSCI/45.1.106","DOIUrl":"https://doi.org/10.1093/TOXSCI/45.1.106","url":null,"abstract":"The increasing prevalence of allergic rhinitis in many countries is becoming a social problem. It is important to determine whether air pollutants are related to the increase in the prevalence rate of allergic rhinitis or not. In this respect, it is necessary to elucidate whether exposure to air pollutants affects the nasal mucosa and causes nasal mucosal hyperresponsiveness to chemical mediators released by antigen-antibody reactions. A previous study revealed that diesel exhaust particulates are potent in augmenting increases in nasal congestion and nasal secretion induced by histamine (T. Kobayashi and T. Ito, 1995, Fundam. Appl. Toxicol. 27, 195-202). In the present study, using a rhinitis model of guinea pigs, we investigated whether short-term (3-hr) exposure to diesel exhaust induces nasal mucosal hyperresponsiveness to histamine. Guinea pigs of each group were exposed to filtered air or to a low or high concentration of diesel exhaust (1 and 3.2 mg/m3 particulates in diluted diesel exhaust, respectively) for 3 hr. After diesel exhaust exposure, sneezing frequency, nasal secretion from the nostril, and intranasal airway resistance induced by histamine were measured as indices of sneezing response, rhinorrhea, and nasal congestion, respectively. Short-term exposure to a low or high concentration of diesel exhaust itself did not induce sneezing, nasal secretion, or nasal congestion. However, short-term exposure to a high concentration of diesel exhaust augmented sneezing and nasal secretion, but not nasal congestion, induced by histamine. In conclusion, short-term exposure to diesel exhaust potently induces nasal mucosal hyperresponsiveness.","PeriodicalId":12658,"journal":{"name":"Fundamental and applied toxicology : official journal of the Society of Toxicology","volume":"5 11 1","pages":"166-72"},"PeriodicalIF":0.0,"publicationDate":"1997-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90358065","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: 46
The ototoxicity of trichloroethylene: extrapolation and relevance of high-concentration, short-duration animal exposure data. 三氯乙烯的耳毒性:高浓度、短时间动物接触数据的推断和相关性。
K. Crofton, X. Zhao
{"title":"The ototoxicity of trichloroethylene: extrapolation and relevance of high-concentration, short-duration animal exposure data.","authors":"K. Crofton, X. Zhao","doi":"10.1093/TOXSCI/38.1.101","DOIUrl":"https://doi.org/10.1093/TOXSCI/38.1.101","url":null,"abstract":"Inhalation exposure to high concentrations of 1,1, 2-trichloroethylene (TCE) has been shown to damage hearing in the mid-frequency range in the rat. The present study directly evaluated the adequacy of high-concentration, short-term exposures to TCE for predicting the neurotoxicity produced by longer duration exposures. Adult male Long-Evans rats (n = 10-12 per group) were exposed to TCE via inhalation (whole body) in 1-m3 stainless steel flow-through chambers for 6 hr/day, 5 days/week. The following exposures were used: 1 day (4000-8000 ppm), 1 week (1000-4000 ppm), 4 weeks (800-3200 ppm), and 13 weeks (800-3200 ppm). Air-only exposed animals served as controls. Auditory thresholds were determined for a 16-kHz tone 3-5 weeks after exposure using reflex modification audiometry. Results replicated previous findings of a hearing loss at 16 kHz for all exposure durations. The dB15 concentrations (concentration that increases thresholds by 15 dB) for 16-kHz thresholds were 6218, 2992, 2592, and 2160 ppm for the 1-day, 1-week, 4-week and 13-week exposures, respectively. These data demonstrate that the ototoxicity of TCE was less than that predicted by a strict concentration x time relationship. These data also demonstrate that simple models of extrapolation (i.e., C x t = k, Haber's Law) overestimate the potency of TCE when extrapolating from short-duration to longer-duration exposures. Furthermore, these data suggest that, relative to ambient or occupational exposures, the ototoxicity of TCE in the rat is a high-concentration effect.","PeriodicalId":12658,"journal":{"name":"Fundamental and applied toxicology : official journal of the Society of Toxicology","volume":"57 1","pages":"101-6"},"PeriodicalIF":0.0,"publicationDate":"1997-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87551879","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: 45
The cult of culling. 对淘汰的崇拜。
A. Palmer, B. Ulbrich
{"title":"The cult of culling.","authors":"A. Palmer, B. Ulbrich","doi":"10.1093/TOXSCI/38.1.7","DOIUrl":"https://doi.org/10.1093/TOXSCI/38.1.7","url":null,"abstract":"It is difficult to understand why culling (reduction of litter size) has become such a widely used procedure in reproductive toxicity studies since there appear to have been no prior investigations to ascertain that it would improve the efficiency of studies with respect to detecting adverse effects. Perhaps the only provable advantage of culling is with respect to economics and convenience. Post hoc rationalizations for culling lack conviction because many of the claims made for culling are erroneous, inconsistent, vague, and contradictory. Mostly, they are based on part truths derived from minimal studies, conducted for totally different purposes. That experimental animals have to be killed sooner or later is unquestioned, but for ethical and scientific reasons, it is imperative that the maximum amount of information is obtained from them. Currently, the most common practice is to cull litters to four per sex (total eight) on Day 4 postpartum. This is totally divorced from natural values for most rat strains and involves elimination, usually without adequate examination, of between 30 and 45% of offspring. Without culling most of these would survive, unless there was a treatment effect. Intuitively, it would seem that removal of such a proportion of offspring would severely limit the possibility of detecting the postnatal equivalent of fetal malformations. Culling totally nullifies litter size as an indicator of toxicity. Indirectly, it also nullifies the value of mean pup weight as an indicator of toxicity because it greatly increases the variation in mean pup weight. This is quite contrary to the claim that culling reduces variance. Further, the increased growth of offspring in culled litters can have long-term consequences of a shorter overall and reproductive life span.","PeriodicalId":12658,"journal":{"name":"Fundamental and applied toxicology : official journal of the Society of Toxicology","volume":"5 1","pages":"7-22"},"PeriodicalIF":0.0,"publicationDate":"1997-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89514378","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: 55
The rationale for culling of rodent litters. 扑杀啮齿动物的基本原理。
Narsingh D. Agnish, Kit A. Keller
{"title":"The rationale for culling of rodent litters.","authors":"Narsingh D. Agnish, Kit A. Keller","doi":"10.1093/TOXSCI/38.1.2","DOIUrl":"https://doi.org/10.1093/TOXSCI/38.1.2","url":null,"abstract":"Based on a review of the pertinent literature and our own unpublished data, it is recommended that culling of rodent litters in the early postnatal period should be a standard practice in delivery-type reproduction studies. This, in turn, will reduce the litter size-induced variability in the growth and development of pups during the postnatal period and thus increase the sensitivity of statistical analyses to detect treatment-related effects. This will also ensure that any adverse effects on pup growth (body weight gain) and development (reflex and behavior development) are not masked by a treatment-induced reduction in litter size. The culling should be carried out randomly and no attempt should be made to selectively cull sick or underweight pups. Since male pups weigh significantly more than females and studies have shown differences in maternal behavior toward one sex over the other, whenever possible each culled litter should consist of an equal number of males and females.","PeriodicalId":12658,"journal":{"name":"Fundamental and applied toxicology : official journal of the Society of Toxicology","volume":"26 1","pages":"2-6"},"PeriodicalIF":0.0,"publicationDate":"1997-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75570146","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: 78
Dichloromethane metabolism to formaldehyde and reaction of formaldehyde with nucleic acids in hepatocytes of rodents and humans with and without glutathione S-transferase T1 and M1 genes. 携带和不携带谷胱甘肽s转移酶T1和M1基因的鼠和人肝细胞中二氯甲烷对甲醛的代谢及甲醛与核酸的反应。
M Casanova, D A Bell, H D Heck
{"title":"Dichloromethane metabolism to formaldehyde and reaction of formaldehyde with nucleic acids in hepatocytes of rodents and humans with and without glutathione S-transferase T1 and M1 genes.","authors":"M Casanova,&nbsp;D A Bell,&nbsp;H D Heck","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Metabolism of dichloromethane (DCM) to formaldehyde (HCHO) via a glutathione S-transferase (GST) pathway is thought to be required for its carcinogenic effects in B6C3F1 mice. In humans, this reaction is catalyzed primarily by the protein product of the gene GSTT1, a member of the Theta class of GST, and perhaps to a small extent by the protein product of the gene GSTM1. Humans are polymorphic with respect to both genes. Since HCHO may bind to both DNA and RNA forming DNA-protein crosslinks (DPX) and RNA-formaldehyde adducts (RFA), respectively, these products were determined in isolated hepatocytes from B6C3F1 mice, F344 rats, Syrian golden hamsters, and humans to compare species with respect to the production of HCHO from DCM and its reaction with nucleic acids. Only mouse hepatocytes formed detectable amounts of DPX, the quantities of which corresponded well with quantities of DPX formed in the livers of mice exposed to DCM in vivo [Casanova, M., Conolly, R.B., and Heck, H. d'A. (1996). Fundam. Appl. Toxicol. 31, 103-116]. Hepatocytes from all rodent species and from humans with functional GSTT1 and GSTM1 genes formed RFA. No RFA were detected in human cells lacking these genes. Yields of RFA in hepatocytes of mice were 4-fold higher than in those of rats, 7-fold higher than in those of humans, and 14-fold higher than in those of hamsters. The RFA:DPX ratio in mouse hepatocytes incubated with DCM was approximately 9.0 +/- 1.4, but it was 1.1 +/- 0.3 when HCHO was added directly to the medium, indicating that HCHO generated internally from DCM is not equivalent to that added externally to cells and that it may occupy separate pools. DPX were not detected in human hepatocytes even at concentrations equivalent to an in vivo exposure of 10,000 ppm; however, the possibility that very small amounts of DPX were produced from DCM cannot be excluded, since HCHO was formed in human cells. Maximal amounts of DPXliver that might be formed in humans were predicted from the amounts in mice and the relative amounts of RFA in hepatocytes of both species. With predicted DPXliver as the dosimeter, the unit risk, the upper 95% confidence limit on the cancer risk, and the margin of exposure were calculated at several concentrations using the linearized multistage and benchmark dose methods. Since the actual delivered dose is smaller than that predicted, the results suggest that DCM poses at most a very low risk of liver cancer to humans.</p>","PeriodicalId":12658,"journal":{"name":"Fundamental and applied toxicology : official journal of the Society of Toxicology","volume":"37 2","pages":"168-80"},"PeriodicalIF":0.0,"publicationDate":"1997-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20187040","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
A rapid in vitro assay for evaluation of metabolism-dependent cytotoxicity of antiepileptic drugs on isolated human lymphocytes. 体外快速测定抗癫痫药物对人淋巴细胞代谢依赖性细胞毒性。
A. Tabatabaei, R. Thies, K. Farrell, F. Abbott
{"title":"A rapid in vitro assay for evaluation of metabolism-dependent cytotoxicity of antiepileptic drugs on isolated human lymphocytes.","authors":"A. Tabatabaei, R. Thies, K. Farrell, F. Abbott","doi":"10.1093/TOXSCI/37.2.181","DOIUrl":"https://doi.org/10.1093/TOXSCI/37.2.181","url":null,"abstract":"In vitro assessment of human lymphocyte viability by trypan blue dye exclusion in the presence of an external metabolizing system (microsomes plus NADPH) has been shown to be a useful method in assessing predisposition to idiopathic toxicity in response to various anticonvulsant drugs. The trypan blue method, however, is labor intensive, is time consuming, is prone to human error, is not suitable for high-volume toxicity screening, and excludes autolysed cells. The objective of this study was to develop a rapid, high-capacity, objective, and easy in vitro cytotoxicity method for the detection of metabolism-dependent cytotoxicity of a test chemical. The in vitro system uses an external metabolizing system (rabbit microsomes) in conjunction with isolated human lymphocytes as the target cells. Cellular toxicity was determined by assessing plasma membrane integrity using a membrane-impermeant fluorescent nucleic acid dye (YO-PRO-1) and a multiwell plate scanner for fluorescence. Using this system, cells incubated with either acetaminophen (1500 micrograms/ml), carbamazepine (62.5 microM), phenytoin (62.5 microM), or phenobarbital (62.5 microM) showed net increases in percentage cell death of 31 +/- 5, 11 +/- 4, 0 +/- 3, and 2 +/- 3, respectively. A metabolism-dependent concentration-response was observed for valproic acid-induced cytotoxicity, which approached a plateau at a concentration of 4000 micrograms/ml with a net percentage cell death of 31 +/- 4. This technique resolves various technical difficulties inherent in viability determinations by the trypan blue exclusion method. The YO-PRO-1 method also may be useful in a clinical setting for the assessment of patients with a genetically determined susceptibility to certain drugs and for identifying the responsible drug in patients with idiopathic toxicity undergoing multiple-drug therapy.","PeriodicalId":12658,"journal":{"name":"Fundamental and applied toxicology : official journal of the Society of Toxicology","volume":"29 1","pages":"181-9"},"PeriodicalIF":0.0,"publicationDate":"1997-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85393902","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: 21
Cytochrome P450-mediated metabolism and nephrotoxicity of N-(3,5-dichlorophenyl)succinimide in Fischer 344 rats. 细胞色素p450介导的N-(3,5-二氯苯基)琥珀酰亚胺在Fischer 344大鼠体内的代谢和肾毒性。
A. Nyarko, G. Kellner-Weibel, P. J. Harvison
{"title":"Cytochrome P450-mediated metabolism and nephrotoxicity of N-(3,5-dichlorophenyl)succinimide in Fischer 344 rats.","authors":"A. Nyarko, G. Kellner-Weibel, P. J. Harvison","doi":"10.1093/TOXSCI/37.2.117","DOIUrl":"https://doi.org/10.1093/TOXSCI/37.2.117","url":null,"abstract":"The agricultural fungicide N-(3,5-dichlorophenyl)succinimide (NDPS) is nephrotoxic in rats. Previous studies have suggested that oxidative hepatic biotransformation is required for the induction of kidney damage. The experiments described in this paper were designed to further investigate the relationship between NDPS metabolism and nephrotoxicity using various modulators of cytochrome P450 activity. Male Fischer 344 rats were pretreated with the P450 inducers Aroclor 1254 (ARO), isoniazid (INH), 3-methylcholanthrene (3-MC), and phenobarbital (PB), or the P450 inhibitor 1-aminobenzotriazole (ABT). Control animals received vehicle only. NDPS metabolism was investigated using hepatocytes isolated from the various treatment groups. Separate experiments were also conducted to evaluate the effects of these pretreatments on NDPS-induced nephrotoxicity in rats. PB and ARO enhanced formation of the known nephrotoxic NDPS metabolites, N-(3,5-dichlorophenyl)-2-hydroxysuccinimide, N-(3,5-dichlorophenyl)-2-hydroxysuccinamic acid, and N-(3,5-dichlorophenyl)-3-hydroxysuccinamic acid, by the hepatocytes. In contrast, ABT inhibited formation of the nephrotoxic metabolites, whereas INH and 3-MC did not alter NDPS biotransformation. NDPS-induced renal damage was potentiated by pretreating the rats with PB or ARO and was attenuated by ABT. Compared with control animals, toxicity was unaffected by INH or 3-MC pretreatments. Thus, there was a correlation between pretreatments that induce P450-mediated NDPS metabolism and the effects that these compounds have on NDPS-induced nephrotoxicity. The data indicate that specific P450 isozymes metabolize NDPS to its hydroxylated products and suggest that these metabolites mediate the nephrotoxicity induced by NDPS.","PeriodicalId":12658,"journal":{"name":"Fundamental and applied toxicology : official journal of the Society of Toxicology","volume":"71 1","pages":"117-24"},"PeriodicalIF":0.0,"publicationDate":"1997-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86373706","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: 15
A rapid in vitro assay for evaluation of metabolism-dependent cytotoxicity of antiepileptic drugs on isolated human lymphocytes. 体外快速测定抗癫痫药物对人淋巴细胞代谢依赖性细胞毒性。
A R Tabatabaei, R L Thies, K Farrell, F S Abbott
{"title":"A rapid in vitro assay for evaluation of metabolism-dependent cytotoxicity of antiepileptic drugs on isolated human lymphocytes.","authors":"A R Tabatabaei,&nbsp;R L Thies,&nbsp;K Farrell,&nbsp;F S Abbott","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In vitro assessment of human lymphocyte viability by trypan blue dye exclusion in the presence of an external metabolizing system (microsomes plus NADPH) has been shown to be a useful method in assessing predisposition to idiopathic toxicity in response to various anticonvulsant drugs. The trypan blue method, however, is labor intensive, is time consuming, is prone to human error, is not suitable for high-volume toxicity screening, and excludes autolysed cells. The objective of this study was to develop a rapid, high-capacity, objective, and easy in vitro cytotoxicity method for the detection of metabolism-dependent cytotoxicity of a test chemical. The in vitro system uses an external metabolizing system (rabbit microsomes) in conjunction with isolated human lymphocytes as the target cells. Cellular toxicity was determined by assessing plasma membrane integrity using a membrane-impermeant fluorescent nucleic acid dye (YO-PRO-1) and a multiwell plate scanner for fluorescence. Using this system, cells incubated with either acetaminophen (1500 micrograms/ml), carbamazepine (62.5 microM), phenytoin (62.5 microM), or phenobarbital (62.5 microM) showed net increases in percentage cell death of 31 +/- 5, 11 +/- 4, 0 +/- 3, and 2 +/- 3, respectively. A metabolism-dependent concentration-response was observed for valproic acid-induced cytotoxicity, which approached a plateau at a concentration of 4000 micrograms/ml with a net percentage cell death of 31 +/- 4. This technique resolves various technical difficulties inherent in viability determinations by the trypan blue exclusion method. The YO-PRO-1 method also may be useful in a clinical setting for the assessment of patients with a genetically determined susceptibility to certain drugs and for identifying the responsible drug in patients with idiopathic toxicity undergoing multiple-drug therapy.</p>","PeriodicalId":12658,"journal":{"name":"Fundamental and applied toxicology : official journal of the Society of Toxicology","volume":"37 2","pages":"181-9"},"PeriodicalIF":0.0,"publicationDate":"1997-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20185000","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
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