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At least 973 records · Page 54Linked to original sources
PubMed1998

Composition of dietary fat affects blood pressure and insulin responses to dietary obesity in the dog.

Cardiovascular and metabolic parameters were evaluated in 15 female spayed dogs before and after they became obese on either a saturated fat (LD, lard, n=8) or unsaturated fat (CO, corn oil, n=7) diet. Body weight and body fat increased significantly in both groups, although no differences occurred between diet groups. Dogs receiving the LD diet exhibited a greater increase in mean arterial pressure than those receiving the CO diet (p<0.01; 15.9 +/- 2.1 vs. 9.8 +/- 3.3 mm Hg increase). The CO diet stimulated a greater increase in heart rate than the LD diet (p<0.05; 32.8 +/- 7.8 vs. 14.1 +/- 5.8 bpm increase). Ganglionic blockade with chlorisondamine caused an increase in HR in both lean groups and in the obese CO group, but not the obese LD group, consistent with a decrease in parasympathetic tone to the heart in the dogs overfed saturated fat. Obesity enhanced the heart rate response to beta-adrenergic stimulation by isoproterenol in the LD, but not CO group. The LD diet increased circulating insulin and decreased insulin sensitivity, whereas the CO diet had no effect on either parameter. These findings suggest that the composition of dietary fat can modulate the autonomic and metabolic adaptations induced by dietary obesity.

Adrenergic beta-Agonists↗
PubMed1976

Neurogenic influences of bilateral adrenalectomy on monoamine oxidase.

Bilateral adrenalectomy (10 days) increased the monoamine oxidase activity of the rat heart, vas deferens, spleen, superior cervical ganglion, and hypothalamus but not that of the rest of the brain, kidney, and liver. Experiments were made to determine whether the increased activity was due to neurogenic influences and whether the enhanced activity of monoamine oxidase was intra- or extraneuronally located. Ganglionic blockade with chlorisondamine failed to alter the rise in cardiac monoamine oxidase. Likewise, superior cervical ganglion monoamine oxidase was unaffected by surgical denervation. 6-Hydroxydopamine abolished the increase in monoamine oxidase activity of the vas deferens, spleen, and superior cervical ganglion but failed to alter that of the kidney, hypothalamus, and the rest of the brain. Cardiac monoamine oxidase was reduced markedly by 6-hydroxydopamine, but the remaining activity was still significantly elevated over the respective control values. The data suggest that the increase in organ monoamine oxidase is predominantly of neuronal origin and that this increase is not due to transsynaptic induction.

Adrenal Glands↗
PubMed1985

Cardiovascular effects of two potential beta-hydroxylase inhibitors.

The purpose of this study was to evaluate the cardiovascular effects of two potential beta-hydroxylase inhibitors, a dithiocarbamate and a thiourea derivative of d-amphetamine, 1 and 2, respectively. These compounds when given intravenously elicited a significant dose-dependent depressor effect in normotensive rats and dogs anesthetized with chloralose-urethane. The hypotensive effect of these compounds appears to be the result of a combination of two action components: (a) the major component, which can be blocked by atropine, exerted through the parasympathetic division and (b) a decreased availability of sympathetic neurotransmitter at the synaptic cleft. A CNS-stimulant effect of these compounds is suggested by their ability to reduce hexobarbital sleeping time in mice and their analeptic effect in all anesthetized animals employed.

Adrenergic alpha-Antagonists↗
PubMed1986

2,2'-Phthaloyl-,2,2'-isophthaloyl-, and 2,2'-terephthaloylbis[1,1,1-trimethylhydrazinium] dihydroxide, bis(inner salts): synthesis, partition coefficients, toxicity and effect on ganglionic transmission.

2,2'-Phthaloyl-, 2,2'-isophthaloyl, and 2,2'-terephthaloyl-boff++[1,1,1-trimethylhydrazinium] dihydroxide, bis(inner salts) 7, 8, and 9 and their hydrazide and hydrazinium diiodide precursors were synthesized and tested for toxicity and their ability to block sympathetic ganglionic transmission. Only the 2,2'-phthaloyl and isophthaloylhydrazinium diiodides 4 and 5 produced weak inhibition of nerve transmission (35% at 2.15 X 10(-3) M). The inner salts were appreciably less toxic than the hydrazinium diiodides in brine shrimp testing. The log P (log10, chloroform pH 7 buffer system) values of all compounds were determined and those of the inner salts and hydrazinium diiodides were in the range of -3.03 to -3.60.

Animals↗
PubMed1997

Roles of heme oxygenase/carbon monoxide system in genetically hypertensive rats.

Although carbon monoxide (CO) has been suggested to be involved in the regulation of cardiovascular function through activation of soluble guanylyl cyclase, the pathophysiological significance in hypertension remains unknown. We therefore examined the effects of heme oxygenase (HO) inhibitor zinc protoporphyrin IX (ZnPP-IX) on blood pressure and determined HO mRNA expression level in various tissues in stroke-prone spontaneously hypertensive rats (SHR-SP/Izm) and Wistar Kyoto rats (WKY/Izm). Although ZnPP-IX significantly increased systolic blood pressure in both strains, the increment of blood pressure was larger in SHR-SP/Izm than in WKY/Izm. An essentially similar increase of blood pressure was demonstrated even in the ganglion blocker-pretreated rats. Constitutive type HO-2 mRNA levels in the aorta and kidney and inducible type HO-1 mRNA levels in the cardiac ventricle were significantly increased in SHR-SP/Izm compared with WKY/Izm. Clearly these results indicate the importance of the endogenous HO/CO system in the peripheral tissues in genetically hypertensive rats.

Animals↗