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Institute
- Institut für Pharmakologie und Toxikologie (413) (remove)
Sonstige beteiligte Institutionen
- Institut für Biopsychologie, Universität Dresden (1)
- Johns Hopkins School of Medicine (1)
- Johns Hopkins School of Medicine, Baltimore, MD, U.S. (1)
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V. (1)
- Max Delbrück Center for Molecular Medicine (1)
- Max-Delbrück-Center für molekulare Medizin, Berlin (1)
- Pharmakologie, Universität Bonn (1)
- Pharmazie, Universität Mailand (1)
- Universitätsklinikum Düsseldorf, Institut für Toxikologie (1)
Active neuropeptide Y receptors were solubilized from rabbit kidney membranes using the zwitterionic detergent 3-[ (3-cholamidopropy l)dimethylammonio ]- 1-propanesulfonic acid (CHAPS). In membrane fragmentsandsoluble extracts neuropeptide Y bindingwas time dependent, saturable, reversible, and of high affinity. Scatchard analysis of equilibrium binding data indicated a single class of binding sites with respective Kn and Bmax values of 0.09 nM and 530 fmol/mg of protein for the membrane-bound receptors and 0.10 nM and 1585 fmol/mg of protein for the soluble receptors. Neuropeptide Y bindingwas specifically inhibited by the nonhydrolyzable GTP analog guanosine 5' -0- (3-thiotripbosphate) in a concentration-dependent manner, with IC\(_{50}\) values of 28 and 0.14 \(\mu\)M for membrane- bound and soluble receptors, respectively, suggesting that neuropeptide Y receptors are functionally coupled to GTP-binding regulatory proteins. CrossHoking studies were performed with the heterobifunctional N-hydroxysuccinimidyl-4-azidobenzoate and the monofunctional neuropeptide Y derivative, azidobenzoyl and led to the identification of a 100 kDa peptide that should represent the covalently labeled neuropeptide Y receptor.
Ich habe versucht darzulegen, daß mechanistische Überlegungen zur Extrapolation der Dosis-WirkungsBeziehung herangezogen werden können. Ein nichtlinearer Verlauf ist nicht nur bei den epigenetischen Kanzerogenen wahrscheinlich, sondern auch bei den DNA-bindenden. Echte Schwellen sind aber nur in solchen Fällen zu erwarten, wo kein endogenes Korrelat besteht. Immerhin können auch steile Nichtlinearitäten zu einer drastischen Risikoreduktion führen, so daß die Anstrengungen dahin gehen sollten, die Steigung und den Bereich des überproportionalen Abfalls experimentell zu zeigen. In einer heterogenen Population kann die 0 0- sis-Wirkungs-Kurve zusätzliche "Wellen" bekommen und wird dadurch grundsätzlich flacher. Im Extremfall ergibt sich eine lineare Dosis-Wirkungs-Beziehung unabhängig vom Wirkmechanismus des Kanzerogens. Diese Proportionalität zwischen tiefster Dosis und Effekt wird bei genotoxischen Kanzerogenen aus mechanistischen Gründen schon für eine homogene Population postuliert, doch kann dies in einer heterogenen Population auch bei epigenetischen Kanzerogenen in Frage kommen.
Fernale BALB/c mice were administered intragastrically with equimolar amounts of either [2-\(^{14}\)C]2-amino-3,8-dimethyi[ 4,5-J]qulnoxaline (MeiQx) or 2-acetylamino[9-\(^{14}\)C]fluorene (2AAF). DNA was isolated from tissues of mice killed either 6 or 24 h after administration. Analysis of liver DNA nucleotide digests by HPLC analysis revealed that all of the radioactivity was attributable to adduct formation. Tbe specific activities of DNA samples were converted to covalent bindlog indices (CBI, J.LIDOI adduct per mol DNA nucleotides/mmol chemical app6ed per kg animal body weight). CBI values of 25 and 9 were detennined for 2AAF and MeiQx in tbe llvers of mice killed 6 h after dosing. The values were in general agreement with the moderate carcinogenic potency of these compounds. The specific activities of DNA preparations obtained from the lddneys, spleens, stomachs, small intestines and large intestlnes of mice treated witb MeiQx and killed 6 h after doslng were S- to 35-times less tban those obtained witb the llver. DNA isolated from tbe lungs (a target organ for MeiQx tumorigenicity) of MeiQx-treated mice was not radiolabeUed at tbe limit of detection (CBI <0.3). With tbe exception of tbe gastrolntestinal tract, the specific activities of DNA samples isolated from mice killed 6 h after administration were higher than those from mice killed after 24 h.
Considering the very large industrial usage of benzene, studies in risk assessment aimed at the evaluation of carcinogenic risk at low Ievels of exposure are important. Animal data can offer indications about what could happen in humans and provide more diverse information than epidemiological data with respect to doseresponse consideration. We have considered experiments investigating metabolism, short·term genotoxicity tests, DNA adduct formation, and carcinogenicity long-term tests. According to the different experiments, a Saturation of benzene metabolism and benzene effects in terms of genotoxicity seems evident above 30 to 100 ppm. Below 30 to 60 ppm the initiating effect ofbenzene seems tobe linear fora large intervaJ ofdosages, at least judging from DNA adduct formation. Potentiallack of a promoting effect of benzene (below 10 ppm) could generate a sublinear response at nontox.ic levels of ex.posure. This possibility was suggested by epidemiological data in humans and is not confirmed or excluded by our observations with animals.
Various substituted aniline derivatives were tested for genotoxicity in several short-term tests in order to examine the hypothesis that a Substitution at both ortho positions (2,6-disubstitution) could prevent genotoxicity due to steric hindrance of an enzymatic activation to electrophilic intermediates. In the Salmonellajmicrosome assay, 2,6-dialkylsubstituted anilines and 2,4,6-trimethylaniline (2,4,6-TMA) were weakly mutagenic in strain TA100 when 20% S9 mixwas used, although effects were small compared to those of 2,4-dimethylaniline and 2,4,5-trimethylaniline (2,4,5-TMA). In Drosophila me/anogaster, however, 2,4,6-TMA and 2,4,6-trichloroaniline (TCA) were mutagenic in the wing spottestat 2-3 times lower doses than 2,4,5-TMA. In the 6-thioguanine resistance test in cultured fibroblasts, 2,4,6-TMA was again mutagenic at lower doses than 2,4,5-TMA. Two methylene-bis-aniline derivatives were also tested with the above methods: 4,4'-methylene-bis-(2-chloroaniline) (MOCA) was moderately genotoxic in al1 3 test systems whereas 4,4'-methylene-bis-(2-ethyl-6-methylaniline) (MMEA) showed no genotoxicity at all. DNA binding sturlies in rats, however, revealed that both MOCA and MMEA produced DNA adducts in the liver at Ievels typically found for moderately strong genotoxic carcinogens. These results indicate that the predictive value of the in vitro test systems and particularly the Salmonellajmicrosome assay is inadequate to detect genotoxicity in aromatic amines. Genotoxicity seems to be a general property of aniline derivatives and does not seem to be greatly influenced by substitution at both ortho positions.