Abstract:
:L-Tryptophan binds to a rat liver nuclear envelope protein, and this binding is saturable, stereospecific, and of high affinity. Utilizing an in vitro assay of [3H]tryptophan binding to rat hepatic nuclear envelopes, we have previously determined that the L-tryptophan obtained from Showa Denko and which was implicated in cases of the eosinophilia-myalgia syndrome (EMS) inhibited [3H]tryptophan binding differently than did control L-tryptophan (not implicated in EMS). Therefore, in this study we investigated whether the addition of 1,1'-ethylidenebis(tryptophan) (EBT), a contaminant or impurity in L-tryptophan implicated in EMS, would have an effect. Our results indicate that EBT alone has little inhibitory binding effect compared with that of control L-tryptophan and that when EBT was added to control L-tryptophan the inhibitory binding effort was similar to that of control L-tryptophan alone. On the other hand, in vitro addition of EBT plus L-tryptophan to nuclei of cultured murine macrophages (WLG5) results in less inhibition of [3H]-tryptophan binding than does addition of L-tryptophan alone. Similar in vitro additions to nuclei of rat brain reveal little effect on binding, as was also the case for hepatic nuclear envelopes. Adding EBT to an in vitro hepatic protein synthesis system and measuring [3H]tryptophan incorporation into acid-precipitable proteins reveal that it competes similarly to that found with equimolar concentrations of unlabeled L-tryptophan. It does not affect [14C]leucine incorporation into proteins. [14C]EBT becomes incorporated in vitro into proteins (acid-precipitable), and this incorporation is diminished in the presence of equimolar concentrations of unlabeled EBT or L-tryptophan. This suggests that EBT or possibly a breakdown product becomes incorporated into proteins. Speculation as to how EBT may affect tissues in experimental animals is presented.
journal_name
Toxicol Appl Pharmacoljournal_title
Toxicology and applied pharmacologyauthors
Sidransky H,Verney E,Cosgrove JW,Latham PS,Mayeno ANdoi
10.1006/taap.1994.1096subject
Has Abstractpub_date
1994-05-01 00:00:00pages
108-13issue
1eissn
0041-008Xissn
1096-0333pii
S0041-008X(84)71096-9journal_volume
126pub_type
杂志文章abstract::Bropirimine is an immunomodulator with experimental antiviral and antitumor activities. This pyrimidinone has been found to be embryolethal at doses (200 and 400 mg/kg) that produce only transient maternal toxicity, when administered to pregnant Upj:TUC(SD)spf rats on specific days of gestation. Serum analyses carried...
journal_title:Toxicology and applied pharmacology
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doi:10.1016/0041-008x(91)90275-j
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journal_title:Toxicology and applied pharmacology
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journal_title:Toxicology and applied pharmacology
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journal_title:Toxicology and applied pharmacology
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journal_title:Toxicology and applied pharmacology
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journal_title:Toxicology and applied pharmacology
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
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更新日期:2019-07-01 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1006/taap.1998.8439
更新日期:1998-07-01 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/0041-008x(87)90133-5
更新日期:1987-09-30 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/s0041-008x(88)80008-5
更新日期:1988-08-01 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2007.05.007
更新日期:2007-09-01 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
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更新日期:2009-10-01 00:00:00
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journal_title:Toxicology and applied pharmacology
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1006/taap.1995.1213
更新日期:1995-11-01 00:00:00
abstract::It has been recently recognized that the gut microbiota, the community of organisms living within the gastrointestinal tract is an integral part of the human body, and that its genoma (the microbiome) interacts with the genes expressed by the cells of the host organism. Several important physiological functions requir...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章,评审
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更新日期:2016-05-15 00:00:00
abstract::Free gold nanoparticles easily aggregate when the environment conditions change. Here, gold nanoparticles (AuNPs) with average diameter of 3.7 nm were prepared and then modified with poly(ethylene glycol) (PEG) to improve stability. The gold nanoparticles were first surface-modified with 3-mercaptopropionic acid (MPA)...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2009.03.009
更新日期:2009-06-01 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1006/taap.1996.0155
更新日期:1996-07-01 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2009.05.021
更新日期:2009-09-15 00:00:00
abstract::Interference of exogenous chemicals with the aromatase enzyme can be useful as a tool to identify chemicals that could act either chemopreventive for hormone-dependent cancer or adverse endocrine disruptive. Aromatase is the key enzyme in the biosynthesis of steroids, as it converts androgens to estrogens. Certain fla...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2007.12.007
更新日期:2008-05-01 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
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更新日期:2000-10-01 00:00:00
abstract::Chlorhexidine (CHX), widely used as antiseptic and therapeutic agent in medicine and dentistry, has a toxic effect both in vivo and in vitro. The intrinsic mechanism underlying CHX-induced cytotoxicity in eukaryotic cells is, however, still unknown. A recent study from our laboratory has suggested that CHX may induce ...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2008.10.012
更新日期:2009-01-15 00:00:00
abstract::Selectively deuterated and methylated analogs of the nematocide 1,2-dibromo-3-chloropropane (DBCP) were compared to DBCP in causing acute renal damage in rats. All of the six deuterated analogs tested at 340 mumol/kg, including the perdeutero compound, failed to significantly alter the kidney necrosis observed at 48 h...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/0041-008x(87)90058-5
更新日期:1987-12-01 00:00:00
abstract::Arsenic-induced side effects limit its application in the treatment of acute promyelocytic leukemia (APL). We recently demonstrated that AS3MT 14215 (rs3740390) genotypes were associated with urinary arsenic metabolites and hematological and biochemical values. To further decipher the role of AS3MT genotypes on arseni...
journal_title:Toxicology and applied pharmacology
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更新日期:2019-09-15 00:00:00
abstract::The elevation of intracellular Ca2+ in various tissue through oxidative stress induced by menadione has been well documented. Increase of Ca2+ level in platelets results in aggregation of platelets. To test the hypothesis that menadione-induced Ca2+ elevations can play a role in platelet aggregation, we have studied t...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1006/taap.1996.0092
更新日期:1996-05-01 00:00:00