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Radiation inactivation analysis of the binding of the A1 adenosine receptor antagonist, 8-cyclopentyl-1,3-dipropylxanthine to rat brain membranes yielded a radiation inactivation size of 58 kDa. In the presence of GTPyS this was reduced to 33 kDa, in good agreement with the size of the ligand-binding subunit detected after photoaffinity labelling. The data indicate that the structural association of A\(_1\) adenosine receptors with G-protein components is altered in situ in the presence of guanine nucleotides.
1 Adenosine and its metabolically stable analogue N.etbyl-carboxamidoadenosine (NECA) enhance histamine release from rat peritoneal mast cells when tbese are stimulated by calciummobilizing agents. NECA and adenosine shift the concentration-response curve of tbe calcium ionophore A23187 to lower concentrations. 2 The potencies of NECA or adenosinein enhancing A23187-induced histamine release are dependent on the Ievel of stimulated release in tbe absence of adenosine analogues. At high Ievels of release their potencies are up to 20 times higher than at low Ievels. Consequently, averaged concentration-response curves of adenosine and NECA for enhancing bistamine release are shallow. 3 The adenosine transport blocker S-(p-nitrobenzyl)-6-thioinosine (NBTI) has no effect by itself at low Ievels of stimulated histamine release, but abolishes the enhancing effect of adenosine. At high Ievels of release, however, NBTI alone enhances the release of histamine. 4 lt is concluded that adenosine and calcium reciprocally enhance the sensitivity of the secretory processes to the effects of the other agent. The Ievels of intracellular adenosine obtained by trapping adenosine inside stimulated mast cells are sufficient to enhance histamine release substantially, suggesting that this effect may play a physiological and pathophysiological role.
The tritiated analogue of 2-chloro-N6-cyclopentyladenosine (CCPA), an adenosine derivative with subnanomolar affinity and a 10000-fold selectivity for A1 adenosine receptors, has been examined as a new agonist radioligand. [3H]CCP A was prepared with a specifi.c radioactivity of 1.58 TBqjmmol ( 43 Ci/mmol) and bound in a reversible manner to A1 receptors from rat brain membranes with a high affinity K0 -value of 0.2 nmol/1. In the presence of GTP a K0 -value of 13 nmol/1 was determined for the low affinity state for agonist binding. Competition of several adenosine receptor agonists and antagonists for [3H]CCPA binding to rat brain membranes confrrmed binding to an A1 receptor. Solubilized A1 receptors bound [3H]CCPA with similar affinity for the high affinity state. At solubilized receptors a reduced association rate was observed in the presence of MgC12, as has been shown for the agonist [ 3H]N6-phenylisopropyladenosine ([3H]PIA). [3H]CCPA was also used for detection of A1 receptors in rat cardio myocyte membranes, a tissue with a very low receptor density. A K0 -value of 0.4 nmol/1 and a Bmax-value of 16 fmol/ mg protein was determined in these membranes. In human platelet membranes no specific binding of [3H]CCPA was measured at concentrations up to 400 nmoljl, indicating that A2 receptors did not bind [3H]CCPA. Based on the subnanomolar affinity and the high selectivity for A1 receptors [ 3H]CCPA proved to be a useful agonist radioligand for characterization of A 1 adenosine receptors also in tissues with very low receptor density.
In the present work we studied the pharmacological profile of adenosine receptors in guinea pig atria by investigating the effect of different adenosine analogues on 86Rb + -efflux from isolated left atria and on binding of the antagonist radioligand 8-cyclopentyl-1 ,3-[\(^3\)H]dipropylxanthine ([\(^3\)H]DPCPX) to atrial membrane preparations. The rate of \8^{86}\)Rb\(^+\) -effiux was increased twofold by the maximally effective concentrations of adenosine receptor agonists. The EC50-values for 2-chloro-N\(^6\)-cyclopentyladenosine (CCPA), R-N\(^6\)-phenylisopropyladenosine (R-PIA), 5'-Nethylcarboxamidoadenosine (NECA), and S-N\(^6\)-phenylisopropyladenosine (S-PIA) were 0.10, 0.14, 0.24 and 12.9 \(\mu\)M, respectively. DPCPX shifted the R-PIA concentration-response curve to the right in a concentration-dependent manner with a K\(_B\)-value of 8.1 nM, indicating competitive antagonism. [\(^3\)H]DPCPX showed a saturable binding to atrial membranes with a Bmax·value of 227 fmol/mg protein and a K\(_D\)-value of 1.3 nM. Competition experiments showed a similar potency for the three agonists CCPA, R-PIA and NECA. S-PIA is 200 times less potent than R-PIA. Our results suggest that the K\(^+\) channel-coupled adenosine receptor in guinea pig atria is of an A\(_1\) subtype.
Polymorphonuclear leukocyte (PMNL) infiltration is an important characteristic in psoriatic lesions. Elevated concentrations of the chemoattractant eicosanoid leukotriene B4 (L TB4) are present in psoriatic skin. Its chemotactic activity is mediated via high affinity receptors on PMNL. The goal of our work was to ascertain whether PMNL infiltration in psoriasis can be accounted for by functional abnormalities of the circulating PMNL due to alterations in the LTB4 receptor density or affinity (or both). No significant difference was found between patients with psoriasis, healthy controls and patients with another inflammatory dermatosis (atopic eczema) with regard to the binding parameters of LTB4 receptors on PMNL. Our findings suggest that PMNL accumulation in psoriatic skin may be the result of an excess of cutaneous hemoattractant rather than the increased readiness of psoriatic PMNL to migrate towards L TB4 due to altered LTB4 receptor density or affinity.
The diet contains a large number of constituents which can be nitrosated in the gastrointestinal tract (especially in the stomach) to potentially carcinogenic nitroso compounds (NOC). The nitrosation of food mixtures has been investigated with a number of assays, such as chemical analysis or detection of alkylating potential, mutagenicity and carcinogenicity. Relatively good information is available on the formation of stable nitrosamines using high nitrite concentrations. Little is known, however, about the formation of chemically unstable NOC at low nitrite concentration and their genotoxicity in target cells. A comparison of the precursor classes, alkylamines, aromatic amines, amino acids, amides and peptides, ureas and guanidines, reveals a vast range, both with respect to daily intake (105-fold) and nitrosation rate (104-fold both for 1st and 2nd order nitrite dependence). A total span of 108 results for the relative yield of NOC in the stomach. The endogenous NOC burden from dietary ureas and aromatic amines may represent as large a hazard as the intake of preformed NOC. Recent evidence also indicates that heterocyclic amines and phenols must be considered and that the half-life of nitrosated a-amino acids can be much longer than that of nitrosated primary alkylamines. In these classes, more information should be collected on dietary concentrations, on the nitrosation under realistic conditions and on the genotoxicity in stomach lining cells. Within a chemical precursor class, a wide range is seen with respect to alkylating potency. It cannot, therefore, be excluded that individual precursors within the top ranking classes might become more important than single preformed NOC. Not considered in the above analysis but probably just as important for a risk evaluation in a population is the knowledge of the nitrosation conditions and target cell susceptibility in individuals.
Neoplastic cell transfonnation induced by estrogens and some other carcinogen& such as benzene appears to involve the induction of mitotic aneuploidy rather than DNA damage and point mutations. As metabolic activation may also play an important roJe in the mechanism of carcinogenesis of these nongenotoxic compounds, we have studied the Interaction of reactive quinone metabolites of various estrogens and of benzene with the major microtubular protein, tubulin, in a cell-free system. Covalent binding of the radioactively labeled metabolites to the a- and 13-subunit of tubulin was found to depend on the structure of the metabolite. When the adducted tubulins were tested in vitro for their ability to polymerize to microtubules, Inhibition of microtubule assembly was obsened in every case, although to varying extents. It is proposed that the fonnation of covalent tubulin adducts may impair the formation of mitotic spindies and thus contribute to chromosomal nondisjunction and aneuploidy induction.
Ethyl carbamate is found in fermented foods: bread contains 3-15 ng/g, stone-fruit brandies 200-20,000 ngfg, and about one-third of table-wine samples analysed contained more than 10 ng/g. In animals, ethyl carbamate is degraded to C02, H20 and NH3, with intermediate formation ofethanol. This degradation has been shown tobe inhibited (postponed) in the mouse by ethanol concentrations in the blood of about 0.15% and higher. A quantitatively minor pathway involves a two-step oxidation of the ethyl group to vinyl carbamate and epoxyethyl carbamate, the postulated electrophilic moiety that reacts with DNA. This reaction is probably the mode of the mutagenic action observed in many cellular and animal systems. The fact that only vinyl carbamate, but not ethyl carbamate, is mutagenic in a standard Ames test is probably because there is insufficient production of the intermediate oxidation product in the standard test. Consistent with this metabolism is the carcinogenic activity of ethyl carbamate in various animal species and in different organs; this activity can be seen even after a single high dose in early life. Quantitative analysis of the total tumour incidences after chronic exposure of rats and mice to 0.1-12.5 mg ethyl carbamate/kg body weightjday in the drinking-water showed a dose-related increase. The main target organs were the mammary gland (female rats and mice having similar susceptibilities) and the Jung (mice only). On the basis of sex- and organ-specific tumour data and with a linear extrapolation to a negligible increase of the lifetime tumour incidence by 0.0001% ( one additional tumour in one milüon individuals exposed for life), a "virtually safe dose .. of 20 to 80 ng/kg body weight/day was estimated. The daily burden reached under normal dietary habits without alcoholic beverages is in the range of about 20 ng/kg body weightfday. Regular table-wine consumption would increase the risk by a factor of up to five. Regular drinking of 20 to 40 ml stone-fruit brandy per day could raise the calculated lifetime tumour risk to near 0.01%.
Linear dose-response relationship for DNA adducts in rat liver from chronic exposure to aflatoxin B1
(1990)
Male F-344 rats were given eH]aßatoxin B1 (AFB1) in the drinking water at three exposure Ievels (0.02, 0.6, 20 J,Lgll, resulting in average dose Ievels of 2.2, 73, 2110 nglkg per day). After 4, 6 and 8 weeks, DNA was ~ted frorn the livers and analyzed for aßatoxin-DNA adducts. Tbe Ievel of DNA adducts did not increase significantly after 4 weeks, indicating that a steady-state for adduct formation and removal had nearly been reached. At 8 weeks, the adduct Ievels were 0.91, 32 and 850 nucleotide-aßatoxin adducts per to' nucleotides, i.e. clearly proportional to the dose. At the high dose Ievel, a near SO% tumor incidence would be expected in a 2-year bioassay with F -344 rats while the low dose used is within the range of estlmated human dietary exposures to aßatoxin in W estem countries. The proportionality seen between exposure and steady-state DNA adduct Ievel is discussed with respect to a linear extrapolation of the tumor risk to low dose.