By A. Philippu, H. Matthaei (auth.), U. Trendelenburg, N. Weiner (eds.)
Catecholamines are vital transmitter components within the autonomic and significant apprehensive platforms. those volumes supply a complete presentation of the state of the art of catecholamine learn and improvement long ago 15 years. The volumes current in-depth reports of topical components of catecholamine examine during which monstrous growth has been made and that are of present curiosity to numerous theoretical and medical disciplines. every one subject has been handled by means of a longtime specialist. scientific topics of suitable value are integrated. Catecholamines are of curiosity in pharmacology, body structure, biochemistry, in addition to in neurology, psychiatry, inner medication (cardiology, high blood pressure, asthma), ophthalmology and anesthesiology.
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Additional info for Catecholamines I
Analysis of the ATPMg2+ -dependent uptake of dopamine and 5-HT by the ABC-test (SCRIVER and WILSON 1964) (analysis of the inhibition of the uptake of two different molecules by a third one) revealed that tyramine competitively inhibited the uptake of dopamine and 5-HT, the Kj-values being similar for the two agonists. Moreover, the uptake of noradrenaline was also inhibited in a competitive way. Since the population of particles used for these experiments contained noradrenergic, dopaminergic and serotoninergic vesicles, it seems that vesicles originating from different neurons possess similar uptake properties and are able to take up more than one neurotransmitter.
The same order of effectiveness of ions was found by DOLAIS-KITABGI and PERLMAN (1975), who used the potassium ionophore valinomycin instead of ATP. They concluded that valinomycin-mediated transport of potassium into the chromaffin granules leads to release of their contents, provided that permeable anions are present. Indeed, the order of effectiveness of the various anions parallels their degree of permeability through membranes (PHILLIPS 1977). Valinomycin was ineffective in the presence of isethionate, which is a large, polar anion and does not readily pass membranes.
1983). They found that, at low concentrations of calcium in the incubation medium « 10- 8 M), the ATP-Mg2+ -de- Transport and Storage of Catecholamines in Vesicles 19 pendent uptake of calcium into mitochondria is negligible, while that into chromaffin granules is considerable. Thus, under certain experimental conditions it is possible to distinguish the ATP-Mg2+ -dependent uptake of calcium into mitochondria from that into chromaffin granules. These findings show that chromaffm granules and synaptic vesicles take up calcium by an ATPMg2+ -dependent process.