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| 3. |
- Lindholm, L. H, et al.
(författare)
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Cost-benefit aspects of treatment of hypertension in the elderly
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Ingår i: Blood pressure. Supplement. - 0803-8023. ; 3, s. 11-14
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Tidskriftsartikel (refereegranskat)abstract
- Treatment of elderly hypertensives with beta-receptor blockers and/or diuretics is cost-effective according to the analyses of the results of the Swedish Trial in Old Patients with Hypertension (STOP-Hypertension). The cost-effectiveness ratios are low and of the same magnitude for both men and women. The results with respect to reduced risk of cardiovascular disease in STOP Hypertension are also supported by several other studies using the same groups of drugs. The more modern drugs (calcium antagonists, alpha 1 blockers, and ACE inhibitors) have not proven their efficacy in the reduction of cardiovascular events in prospective studies of primary hypertension. It has, however, been shown that they lower blood pressure well also in the elderly and that they are cost-effective among the elderly if treatment with beta-receptor blockers and/or diuretics is contraindicated, provided that they lower the incidence of cardiovascular disease to the same extent as do beta-receptor blockers and diuretics. Studies tackling this latter question are under way, also in the elderly.
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| 4. |
- Matsui, S, et al.
(författare)
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Distribution of serum autoantibodies against G-protein-coupled cardiovascular receptors in Japanese patients with cardiomyopathy.
- 1996
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Ingår i: Blood pressure. Supplement. - 0803-8023. ; 3, s. 28-30
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Tidskriftsartikel (refereegranskat)abstract
- The prevalence of anti-receptor autoantibodies in the sera of patients with dilated cardiomyopathy has been previously demonstrated. This article will briefly review the distribution of autoantibodies against a series of G-protein-coupled cardiovascular receptors such as human beta 1 and beta 2 adrenoceptors, alpha 1 adrenoceptors, M2 muscarinic acetylcholine receptors and angiotensin II-I (AT1) receptors in a well-defined population of patients with dilated cardiomyopathy from Japan.
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| 5. |
- Schulze, W, et al.
(författare)
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Immunocytochemical localization of muscarinic, adrenergic and AT1 receptors.
- 1996
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Ingår i: Blood pressure. Supplement. - 0803-8023. ; 3, s. 15-8
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- By indirect immunofluorescence and post-embedding EM gold technique, the localization of alpha 1-adrenergic, M2-muscarinic and angiotensin II receptor-I (AT1) were determinated. With antipeptide antibodies directed against the second extracellular loops of all three receptors, these receptors were found to be localized at the sarcolemma of adult rat cardiomyocytes and at the surface membranes of cultivated neonatal heart cells. Additionally, M2 receptors were localized along T-tubule membranes of both rat and human adult cardiomyocytes. alpha 1-Adrenergic receptors were found intracellular near the surface of atrial granules (ANF-granules). By using M2 and alpha 1-adrenergic receptor antibodies the strongest fluorescence was found in the right atrium of the rat. Besides the localization in cardiomyocytes, AT1 receptors were also localized in outer plasma membranes and the endoplasmic reticulum of fibroblasts, and the surface of smooth muscle cells of the major arteries and veins. Likewise, the muscarinic M2 receptors were found along the outer membranes of endothelial cells from capillaries and endocardium.
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| 6. |
- Wallukat, G, et al.
(författare)
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Agonistic effects of anti-peptide antibodies and autoantibodies directed against adrenergic and cholinergic receptors: absence of desensitization.
- 1996
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Ingår i: Blood pressure. Supplement. - 0803-8023. ; 3, s. 31-6
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Tidskriftsartikel (refereegranskat)abstract
- Affinity-purified autoantibodies and anti-peptide antibodies directed against the second extracellular loop of the beta 1-adrenoceptor increase the beating rate of cultured cardiomyocytes just like the beta-adrenergic agonist isoprenaline. Their positive chronotropic action is blocked by beta-adrenergic antagonists. Affinity-purified autoantibodies and anti-peptide antibodies directed against the muscarinic cholinergic M2 receptor exert in these myocytes, like the muscarinic cholinergic agent carbachol, a negative chronotropic effect that is antagonized by atropine. In contrast to the agonism of isoprenaline and carbachol, the described agonistic effects of the antibodies are not subject to desensitization.
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| 7. |
- Wang, W Z, et al.
(författare)
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Effects of anti-peptide antibodies against human M2 muscarinic receptors on cardiac function in rats in vivo.
- 1996
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Ingår i: Blood pressure. Supplement. - 0803-8023. ; 3, s. 25-7
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Tidskriftsartikel (refereegranskat)abstract
- The effects of anti-peptide antibodies (Ab) against the second extracellular loop of human muscarinic receptor-2 on cardiac function in rats in vivo were studied. These effects were compared with those of the muscarinic receptor agonist, carbachol (Carb). It was shown that: (1) both Carb and Ab administered intravenously in the same doses of 0.4 nmol, 1.0 nmol, and 2.0 nmol were able to inhibit the maximal rate of rise of ventricular pressure (+dp/dt max) in a dose-dependent manner. (2) The isoproterenol (Iso)-induced increase in HR and +dp/dt max were also markedly inhibited by Carb and Ab. Administration of 1.0 nmol Carb decreased the Iso-stimulated increase of HR from 13.6 +/- 2.0 to 4.9 +/- 0.7% and decreased the increase of +dp/dt max from 27.9 +/- 3.2 to 4.8 +/- 0.6%, respectively; whereas Ab decreased the HR to 6.5 +/- 1.1% and +dp/dt max to 13.5 +/- 1.2%, respectively. (3) Both the inhibitory effects of Carb and Ab could be significantly blocked by atropine (1.4 nmol). These findings suggest that the Ab display a stimulatory muscarinic activity similar to Carb in inhibiting the cardiac function as evidenced by its negative chronotropic and inotropic effects.
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| 8. |
- Wang, W Z, et al.
(författare)
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Effects of anti-peptide antibodies against human M2 muscarinic receptors on the cAMP generating system in guinea pig ventricles.
- 1996
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Ingår i: Blood pressure. Supplement. - 0803-8023. ; 3, s. 22-4
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Tidskriftsartikel (refereegranskat)abstract
- The effects of anti-peptide antibodies (Ab) against the second extracellular loop of human muscarinic receptor-2 on the cAMP generating system in guinea pig ventricles were studied. These effects were compared with those of the muscarinic receptor agonist carbachol (Carb). It was shown that: (1) both Carb and Ab were able to inhibit the isoproterenol (Iso)-stimulated cAMP production of ventricles in a dose-dependent manner. Carb at 2 microM, 10 microM and 50 microM decreased Iso-stimulated cAMP production by 8.0 +/- 1.1, 15.8 +/- 1.2 and 28.4 +/- 1.7%, respectively; whereas Ab at 50 nM, 100 nM and 400 nM decreased it by 5.8 +/- 0.4, 16.8 +/- 1.4 and 30.6 +/- 2.5%, respectively. (2) Both Carb and Ab could also inhibit the basal cAMP content of ventricles significantly. Carb at 10 microM and Ab at 100 nM decreased it by 46.9 +/- 4.2% and 60.2 +/- 4.6%, respectively. (3) The inhibitory effects of both Ab and Carb on Iso-stimulated cAMP production were significantly prevented by atropine at 1.5 microM. (4) The inhibitory effect of Ab at 100 nM was almost completely abolished by the peptide (700 nM) used as immunogen. These findings suggest that the antibodies exhibit a stimulatory muscarinic activity similar to carbachol in the inhibitory modulation of cAMP production.
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| 9. |
- Zhu, L, et al.
(författare)
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Immunocytochemical studies of M2 muscarinic receptors in guinea pig atria and ventricles using anti-peptide antibodies.
- 1996
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Ingår i: Blood pressure. Supplement. - 0803-8023. ; 3, s. 19-21
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The localization and density of M2 muscarinic receptors in guinea pig atria and ventricles were studied by immunocytochemical techniques, with anti-peptide antibodies against the second extracellular loop of human muscarinic receptor-2. It was shown that the positive immunoreaction of M2 muscarinic receptor was characterized by brown-yellow granules of variable size and shape, which were located mainly on the cell surface and in the cytoplasm far from nuclei. The positive immunoreactive substances appeared in both atrial and ventricular myocytes, with the density being greater in atria than in ventricles. Pre-incubation with atropine, but not carbachol, significantly reduced the intensity of positive immunoreactivity. This indicates that the binding of antibody to receptor site can be partially blocked by M2 muscarinic receptor antagonist.
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