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Dose-response relationship and low dose extrapolation in chemical carcinogenesis [commentary]
(1990)
Data supporting various dose-respome relationships in chemical carcinogenesis are summarized. General principles are derived to explain the relationships between exposure dose, JI>NA adduct Ievel, induction of genetic changes, and tumor incidence. Some mechanistic aspects of epigenetic carcinogens (stimulation of ceU division and maldlfl'erentlation) are analyzed in a similar way. In a bomogeneous pnpulation, non-linearities are frequent. They are due to pbenomena of induction or saturation of enzymatic activities and to the multi-step nature of carcinog~: if a carcinogen acce1erates more than one step, the SUperposition of the dose- response curves for the indJvidual steps can result in an exponential relationship. A fourth power of the dose was the maximum seen in animals (fonnaldehyde). At the lowest dose Ievels, a proportionality between dose and tumor induction is postulated independent of the mechanism of action if the carcinogen aceeierotes the endogenous proass responsible for spootaneous tumor formation. Low-dose thresholds are expected only for situations where the carcinogen acts in a way that has no endogenous counterpart. Epidemiologfcal studies in humans show linear dose- response curves in all but two investigations. The difference from the strongly nonlinear slopes ·seen in animal studies could be due to the heterogeneity of the human population: if the individual sensitivity to a carcinogen is governed by a large number of genetic and Iife-style factors, the non-linea.rities will tend to cancel each other out and the dose- response curve becomes 'quasi-linear'.
Male rats were treated for 2 months with 1000 ppm nafenopin in the diet or for 4 or 7 days with a choline-devoid low-methionine diet. DNA was isolated from the livers and analyzed for the presence of cis-thymidine glycol-3'-phosphate (cis-dTGp) by 32P-postlabeling and for the Ievel of 8-hydroxy-deoxyguanosine (8-0H-dG) by electrochemical detection (ECD). In no DNA sample was the Ievel of cis-dTGp above the Iimit of detection of 1 modified thymidine per 106 nucleotides. With 8-0H-dG, a background Ievel of this modification of 20 8-0H-dG per 106 nucleosides was found in liver DNA of control rats, which was not affected by either treatment. It is postulated for thymidine glycol that a potential increase was below the Iimit of detection or was rapidly repaired in vivo and that the steady-state Ievel of endogenous 8-hydroxydeoxyguanosine appears not tobe influenced by the treatments chosen.
In a colorimetric assay using 4-( p-nitrobenzyl)pyridine (NBP) as a nucleophilic scavenger of alkylating agents, the nitrosation and alkylation reactions were investigated for a number of amino acids and derivatives. The alkylating activity increased with the square of the nitrite concentration. The nitrosation rate constants for aspartic acid, aspartame, and glycine ethylester ( = precursors C) were 0.08, 1.4 and ~ 0.2, respectively, expressed in terms of the pH-dependent \(k_2\) rate constant of the equation dNOCjdt = \(k_2\) • (C]· [nitrite]\(^2\) • The rates correlated inversely with the basicity of the amino group. The stability of the alkylating activity was astonishingly high, both in acid and at neutral pH. Half-lives of 500, 200, and 30 min were determined for aspartic acid (pH 3.5), aspartame (pH 2.5), and glycine ethylester (pH 2.5). Values of 60, 15, and 2 min; respectively, were found at pH 7. It is concluded that rearrangement of the primary N-nitroso product to the ultimate alkylating agent could be rate-limiting. The potential of nitrosated a-amino acids to bind to DN A in vivo was investigated by oral gavage of radiolabelled glycine ethylester to rats, followed irnmediately by sodium nitrite. DNA was isolated from stomach and liver and analysed for radioactivity and modified nucleotides. No indication of DNA adduct formation was obtained. Based on an estimation of the dose fraction converted from glycine ethylester to the nitroso product under the given experimental conditions, the maximum possible DNA-binding potency of nitroso glycine ethylester is about one order of magnitude below the methylating potency of N-nitrosomethylurea in rat stomach. The apparent discrepancy to the in vitro data could be due to efficient detoxification processes in mammalian cells.
A list ofendogenaus DNA·damaging agents and processes is given. Endogenaus e/ectrophiles are found with the cosubstrates of physiological transfer reactions (S-adenosylrnethionine for methylation, A TP for phosphorylation, NAD\(^+\) for ADP-ribosylation, acetyl CoA for acetylation). Aldehyde groups (glyceraldehyde- 3-phosphate, formaldehyde, open forms of reducing sugars, degradation products of peroxidation) or alkylating degradation products derived from endogenaus nitrose compounds represent additional possibilities. Radical-forming reactions include leakage of the superoxide anion radical from terminal cytochromes and redox cycles, hydroxyl radical formation by the Fenton reaction from endogenaus hydrogen peroxide, and the formation of lipid peroxides. Genetic instability by spontaneaus deaminations and depurinations as well as replicative instability by tautomer errors andin the presence of mutagenic metal ions represent a third important dass of endogenaus genotoxic processes. The postulated endogenaus genotoxicity could form the mechanistic basis for what is called 'spontaneous' tumor incidence and explain the possibility of an increased tumor incidence after treatment of animals with non-genotoxic compounds exhibiting tumor-promoting activity only. Individual differences are expected to be seen also with endogenaus DNA damage. The presence of endogenaus DNA darnage implies that exogenaus DNAcarcinogen adducts give rise to an incremental darnage which is expected to be proportional to the carcinogen dose at lowest Ievels. An increased tumor risk due to exposure to exogenaus genotoxic carcinogens could therefore be assessed in terms of the background DNA damage~ for instance in multiples of the mean Ievel or of the interindividual variability in a population.
The effects of guanine nucleotides on binding of 8-cyclopentyl-1,3-[\(^3\)H]dipropylxanthine [\(^3\)H]DPCPX), a highly selective A\(_1\) adenosine receptor antagonist, have been investigated in rat brain membranes and solubilized A\(_1\) receptors. GTP, which induces uncoupling of receptors from guanine nucleotide binding proteins, increased binding of [\(^3\)H]DPCPX in a concentration-dependent manner. The rank order of potency for different guanine nucleotides for increasing [\(^3\)H]DPCPX bindingwas the same as for guanine nuc1eotide-induced inhibition of agonist binding. Therefore, a role for a guanine nucleotide binding protein, e.g., G\(_i\), in the regulation of antagonist binding is suggested. This was confirmed by inactivation ofGi by N-ethylmaleimide (NEM) treatment of membranes, which resulted in an increase in [\(^3\)H]DPCPX binding similar to that seen with addition of GTP. Kinetic and equilibrium binding studies showed that the GTP- or NEM-induced increase in antagonist binding was not caused by an affinity change of A\(-1\) receptors for [\(^3\)H]DPCPX but by an increased Bmu value. Guanine nucleotides had similar effects on membrane-bound and solubilized receptors, with the effects in the solubilized system being more pronounced. In the absence of GTP, when rnost receptors are in a high-affinity state for agonists, only a few receptors are labeled by [\(^3\)H]DPCPX. It is suggested that [\(^3\)H]DPCPX binding is inhibited when receptors are coupled to G\(_i\). Therefore, uncoupling of A\(_1\) receptors from G\(_i\) by guanine nucleotides or by inactivation of G\(_i\) with NEM results in an increased antagonist binding.
Key Words: Adenosine receptors-8 -Cyclopentyl-1,3-eH]dipropylxanthine-Antagenist binding-Guanine nucleotide effects. Klotz K.-N. et al. Guanine nucleotide etfects on 8-cyclopentyl-1 ,3-eH]dipropylxanthine binding to membrane-bound and solubilized A1 adenosine receptors of rat brain. J. Neurochem. 54, 1988-1994 (1990).
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.