Sharone Barone

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1. This investigation examined the stereoselective nature of the steroid-sensitive extraneuronal O-methylation process for the isomers of isoprenaline in the rabbit aorta. 2. The rate of O-methylation of (-)- and (+)-isoprenaline was linear with substrate concentration in the range 0.24 to 4.7 μmol·l−1. There was marked preference for the O-methylation of(More)
A non-radiochemical procedure has been developed which permits the separation and measurement of isoprenaline (ISO) and the O-methylated metabolite, 3-methoxyisoprenaline (MeOISO). This methodology employs alumina chromatography and toluene solvent extraction to separate the catecholamine, ISO, from the O-methylated derivative, MeOISO. High-performance(More)
The purpose of the present studies was to examine the renal distribution and functional properties of Na(+)-HCO(3)(-) cotransporter type 4 (NBC4), the latest NBC isoform to be identified. Zonal distribution studies in rat kidney by Northern blot hybridization and RT-PCR demonstrated that NBC4 is highly abundant in the outer medulla and cortex but is low in(More)
Activities of branched-chain amino acid transaminase were assayed in maternal skeletal muscle, liver and fetal skeletal muscle, cardiac muscle, liver, kidney and placenta obtained from fed and 5-day-fasted late gestation ewes. Very high activities were found in placenta; fetal skeletal muscle also had high activity. Fetal brain had intermediate activity,(More)
AIM The objective of these studies was to examine the effects of long-term vasopressin treatment on acid-base transporters in the collecting duct of rat kidney. METHODS Brattleboro rats were placed in metabolic cages and treated with daily injections of 1-desamino-8-D-arginine vasopressin (dDAVP), a selective V2-receptor agonist, or its vehicle (control)(More)
Experiments were performed to determined the effect of protein deprivation on CFU-S in the spleen and femoral marrow, on the peripheral blood counts, and on the rate at which these parameters regenerate following radiation. Splenic CFU-S decrease in number after only 3 days on diets containing 5% protein or less. Marrow CFU-S, on the other hand, decrease(More)
Functionalized congeners derived from 1,3-dipropyl-8-phenylxanthine and from N6-phenyladenosine were derivatized to contain electrophilic groups (isothiocyanate, N-hydroxysuccinimide ester, maleimide, sulfonyl chloride, or alpha-haloacyl group) capable of reaction with nucleophiles on biopolymers. The goal was to inhibit chemically the A1 adenosine receptor(More)
The present study examines the subcellular site of catecholamine O-methylation in extraneuronal tissue. S-Adenosyl-l-methionine, a methyl donor that does not diffuse across biological membranes, was used to assess the participation of plasma membrane bound catechol-O-methyltransferase vs. cytoplasmic catechol-O-methyltransferase in the catecholamine(More)
The noradrenaline (NA) content of the mesenteric arteries from spontaneously-hypertensive rats (SHR) are greater than those in arteries from normotensive Kyoto Wistar rats (WKY). The possibility that impaired neuronal monoamine oxidase (MAO) activity in mesenteric arteries from SHR rats was responsible for the differences in NA content was explored. The(More)
Chemically functionalized congeners of N6-phenyladenosine and 1,3-dipropyl-8-phenylxanthine have been covalently coupled to fatty acids, diglycerides, and a phospholipid. The lipid-drug conjugates inhibit R-[3H]-phenylisopropyladenosine binding to A1-adenosine receptors in rat cerebral cortex membranes. A xanthine-phosphatidylethanolamine conjugate bound(More)