Mitochondrial enzymes and chromaffin granules
نویسندگان
چکیده
منابع مشابه
H' ATPase of Chromaffin Granules
The chromaffin granule ATPase mediates an inwardly directed transport of H+ against concentration gradients, thereby forming and maintaining an electrochemical transmembrane H+ gradient. The kinetics of this ATPase, its activity modulation by changes in electrochemical H+ gradients, and the stoichiometry between H+ transport and ATP hydrolysis were studied in intact bovine chromaffin granules, ...
متن کاملIon permeability of isolated chromaffin granules
The passive ion permeability, regulation of volume, and internal pH of isolated bovine chromaffin granules were studied by radiochemical, potentiometric, gravimetric, and spectrophotometric techniques. Chromaffin granules behave as perfect osmometers between 340 and 1,000 mosM in choline chloride, NaCl, and KCl as measured by changes in absorbance at 430 nm or from intragranular water measureme...
متن کاملSpontaneous Vesiculation of Chromaffin Granules in vitro
It is now fairly well established that the catecholamines and ATP stored in the adrenalmedullary chromaffin granules are released by exocytosis, a process involving fusion of the chrome-granule membrane to the external limiting membrane of the chromaffin cell and extrusion of the core. The proteins and the lipids of the granule membrane are not released, however, and it has been suggested on th...
متن کاملFe2+-induced lysis and lipid peroxidation of chromaffin granules.
Chromaffin granules, the catecholaminergic storage granules from adrenal chromaffin cells, lysed in 10(-9)-10(-7) M Fe2+. Lysis was accompanied by the production of malondialdehyde which results from lipid peroxidation. Both chromaffin granule lysis and malondialdehyde production were inhibited by the free radical trapping agent butylated hydroxytoluene but not by catalase and/or superoxide dis...
متن کاملFree concentrations of sodium, potassium and calcium in chromaffin granules.
We have measured the contents of Na+ and K+ in isolated chromaffin granules. Total contents varied between 227 and 283 nmol/mg of protein, equivalent to matrix concentrations of 53-66 mM. The value found depended on the isolation buffer used, and the ratio of the two ions reflected the composition of the buffer. We then measured the free concentration of each of these ions, and of Ca2+, in the ...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 1957
ISSN: 0022-3751
DOI: 10.1113/jphysiol.1957.sp005893