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Weight loss herbal formula||Ginkgo biloba||
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Interferon research abs 1 ||
Hemoglobin research abs ||
Stem cell research abs ||
Nucleic acid research abs ||
Herpes research abs ||
Bronchitis research abs ||
Schizophrenia research abs ||
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hair research abs ||
hair related research references ||
testosterone related research references ||
melanin related research references ||
caffeine related research references ||
nicotine related research references
J Physiol. 2000 Nov 1;528(Pt 3):419-33.
Fast imaging in two dimensions resolves extensive sources of Ca2+ sparks in frog skeletal muscle.
Brum G, Gonzalez A, Rengifo J, Shirokova N, Rios E.
Department of Molecular Biophysics and Physiology, Rush University, 1750 W. Harrison Street, Chicago, IL 60612, USA.
Ca2+ sparks were monitored by confocal laser-scanning microscopy of fluo-3 at video rates, in fast twitch muscle fibres, stimulated by exposure to caffeine and/or low [Mg2+]. Scanning was in two spatial dimensions ('2D') or 2D plus time, at 4 ms per image frame. Sparks were identified in 2D images of normalized fluorescence by an automatic procedure, which also evaluated the event's location and morphometric parameters. Most sparks were circular, but some were elongated, especially in caffeine. Separation of the spark from circular symmetry was quantified by its eccentricity (length/width - 1). In an internal solution with 0.4 mM [Mg2+], sparks (989 events in 4 cells) had amplitude 0.73, width 1.94 microm, length 2.12 microm and eccentricity not significantly different from 0. Upon application of 1 mM caffeine, length (of 2578 events in the same cells) increased significantly (by 0.41 microm, or 19 %), width increased by 0.18 microm (9 %) and amplitude decreased slightly. The eccentricity became significantly different from 0, and the sparks' long axis predominantly oriented parallel to the plane of the Z disks. More than 10 % of the events in caffeine had length greater than 4 microm, a relatively flat top, and a sharp termination at both ends of the major axis. Additionally, there was only a weak correlation between eccentricity and amplitude. These properties suggest that the elongated events are produced by simultaneous opening of multiple channels within a junction, rather than anisotropic diffusion of Ca2+ or random overlap of round sparks. Elongated events often increased in eccentricity early in their evolution. Then, most remained elongated during their rise and decay, while others spread spatially in the plane of the Z disks. In 1-2 % of the events, the centre of mass migrated in space, over time, at approximately 0.1 microm x ms(-1). These spatio-temporal features require the involvement of multiple release channels, at spatially resolvable locations. Because sources often spread over distances greater than 1 or 2 microm, and arrays of junctional elements (couplons) are at most 1.2 microm long, it must be possible for activation of release to propagate between neighbouring couplons, especially under the influence of caffeine and/or low [Mg2+].
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11060121&dopt=Abstract
J Cardiovasc Pharmacol. 2000 Nov;36(5):669-75.
Effects of prolonged caffeine consumption on cardiac contractile function in rats.
Kapelko VI, Lakomkin VL, Studneva IM, Pisarenko OI.
Institute of Experimental Cardiology, Russian Cardiological Scientific and Productive Complex, Moscow. v.kapelkardio.ru
The purpose of the study was to explore effects of prolonged caffeine administration on the contractile function and myocardial energy metabolites of the isolated rat heart. Caffeine treatment for 1 week (10 mg/kg, i.p., twice a day) was followed by unchanged pump function of the isolated heart, but reduced maximal left ventricular (LV) systolic pressure by 14% (p < 0.05). Caffeine consumption during 8-9 weeks (0.1% water solution) was also followed by unchanged maximal pump function but increased maximal double product (LV developed pressure multiplied by heart rate) by 23% (p < 0.05). The hearts of caffeine-consumed rats also maintained a higher level of the pump function at a high rate of atrial electrostimulation. The myocardial content of adenosine triphosphate (ATP), creatine phosphate, as well as creatine was slightly but insignificantly increased after caffeine consumption. Results show that in the course of prolonged caffeine treatment, the maximal myocardial contractile function first decreases and then increases, showing adaptation of the heart.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11065228&dopt=Abstract
J Cardiovasc Pharmacol. 2000 Nov;36(5):681-6.
The effect of adenosine on blood pressure variability in sinoaortic denervated rats is mediated by adenosine A2a-Receptor.
Shen FM, Su DF.
Department of Pharmacology, Second Military Medical University, Shanghai, China.
It is known that adenosine decreases blood pressure (BP) level as well as blood pressure variability (BPV). However, there is little information about the effect of adenosine on BPV. With a computerized analytic system for BP and heart rate (HR) that could sample the data continuously in conscious, freely moving rats, we studied the effects of different agonists and antagonists of adenosine receptors on BPV in sinoaortic denervated (SAD) rats. It was found that both adenosine and 5'-N-cyclopropyl-carboxamidoadenosine (CPCA, a selective adenosine A,-receptor agonist) decreased BPV. whereas N6-cyclopentyladenosine (CPA, a selective adenosine A1-receptor agonist) had no significant effect on BPV. When the rats were pretreated with theophylline (the nonselective adenosine-receptor antagonist), the inhibitory effects of adenosine as well as CPCA on BPV were abolished. Furthermore, it was found that 8-(3-chlorostyryl)caffeine (CSC, a selective adenosine A2a-receptor antagonist), also could prevent such an effect on BPV of CPCA. By itself, however, neither theophylline nor CSC had any influence on BPV. These results suggest that the effect of adenosine on BPV is mediated by adenosine A2a-receptor.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11065230&dopt=Abstract
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