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Registros recuperados: 5
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CaV 3.1 and CaV 3.3 account for T-type Ca2+ current in GH3 cells BJMBR
Mudado,M.A.; Rodrigues,A.L.; Prado,V.F.; Beirão,P.S.L.; Cruz,J.S..
T-type Ca2+ channels are important for cell signaling by a variety of cells. We report here the electrophysiological and molecular characteristics of the whole-cell Ca2+ current in GH3 clonal pituitary cells. The current inactivation at 0 mV was described by a single exponential function with a time constant of 18.32 ± 1.87 ms (N = 16). The I-V relationship measured with Ca2+ as a charge carrier was shifted to the left when we applied a conditioning pre-pulse of up to -120 mV, indicating that a low voltage-activated current may be present in GH3 cells. Transient currents were first activated at -50 mV and peaked around -20 mV. The half-maximal voltage activation and the slope factors for the two conditions are -35.02 ± 2.4 and 6.7 ± 0.3 mV (pre-pulse of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Calcium channel; T-type; Electrophysiology; RT-PCR; GH3 cells.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000600020
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Effect of exercise training on Ca2+ release units of left ventricular myocytes of spontaneously hypertensive rats BJMBR
Carneiro-Júnior,M.A.; Quintão-Júnior,J.F.; Drummond,L.R.; Lavorato,V.N.; Drummond,F.R.; Amadeu,M.A.; Oliveira,E.M.; Felix,L.B.; Cruz,J.S.; Mill,J.G.; Natali,A.J.; Prímola-Gomes,T.N..
In cardiomyocytes, calcium (Ca2+) release units comprise clusters of intracellular Ca2+ release channels located on the sarcoplasmic reticulum, and hypertension is well established as a cause of defects in calcium release unit function. Our objective was to determine whether endurance exercise training could attenuate the deleterious effects of hypertension on calcium release unit components and Ca2+ sparks in left ventricular myocytes of spontaneously hypertensive rats. Male Wistar and spontaneously hypertensive rats (4 months of age) were divided into 4 groups: normotensive (NC) and hypertensive control (HC), and normotensive (NT) and hypertensive trained (HT) animals (7 rats per group). NC and HC rats were submitted to a low-intensity treadmill running...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Physical activity; Hypertension; Cardiomyocyte; Calcium handling; Sarcoplasmic reticulum.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2014001100960
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Electrophysiological evidence for glial-subtype glutamate transporter functional expression in rat cerebellar granule neurons BJMBR
Mafra,R.A.; Leão,R.M.; Beirão,P.S.L.; Cruz,J.S..
A glutamate-sensitive inward current (Iglu) is described in rat cerebellar granule neurons and related to a glutamate transport mechanism. We examined the features of Iglu using the patch-clamp technique. In steady-state conditions the Iglu measured 8.14 ± 1.9 pA. Iglu was identified as a voltage-dependent inward current showing a strong rectification at positive potentials. L-Glutamate activated the inward current in a dose-dependent manner, with a half-maximal effect at about 18 µM and a maximum increase of 51.2 ± 4.4%. The inward current was blocked by the presence of dihydrokainate (0.5 mM), shown by others to readily block the GLT1 isoform. We thus speculate that Iglu could be attributed to the presence of a native glutamate transporter in cerebellar...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cerebellar granule neurons; Excitatory amino-acid transporter type 2; Patch-clamp; Glutamate; Whole-cell voltage-clamp.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000700018
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Is there a role for voltage-gated Na+ channels in the aggressiveness of breast cancer? BJMBR
Rhana,P.; Trivelato Junior,R.R.; Beirão,P.S.L.; Cruz,J.S.; Rodrigues,A.L.P..
Breast cancer is the most common cancer among women and its metastatic potential is responsible for numerous deaths. Thus, the need to find new targets for improving treatment, and even finding the cure, becomes increasingly greater. Ion channels are known to participate in several physiological functions, such as muscle contraction, cell volume regulation, immune response and cell proliferation. In breast cancer, different types of ion channels have been associated with tumorigenesis. Recently, voltage-gated Na+ channels (VGSC) have been implicated in the processes that lead to increased tumor aggressiveness. To explain this relationship, different theories, associated with pH changes, gene expression and intracellular Ca2+, have been proposed in an...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Breast cancer; Ion channels; Metastasis; Nav1.5 channel.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2017000700301
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Plasma cytokine response, lipid peroxidation and NF-κB activation in skeletal muscle following maximum progressive swimming BJMBR
Oleto,A.F.; Sousa,L.P.; Barreto,T.O.; Cruz,J.S.; Penaforte,C.L.; Magalhães,J.C.; Sousa-Franco,J.; Pinto,K.M.C.; Campi-Azevedo,A.C.; Rocha-Vieira,E..
Our objective was to determine lipid peroxidation and nuclear factor-κB (NF-κB) activation in skeletal muscle and the plasma cytokine profile following maximum progressive swimming. Adult male Swiss mice (N = 15) adapted to the aquatic environment were randomly divided into three groups: immediately after exercise (EX1), 3 h after exercise (EX2) and control. Animals from the exercising groups swam until exhaustion, with an initial workload of 2% of body mass attached to the tail. Control mice did not perform any exercise but were kept immersed in water for 20 min. Maximum swimming led to reactive oxygen species (ROS) generation in skeletal muscle, as indicated by increased thiobarbituric acid reactive species (TBARS) levels (4062.67 ±1487.10 vs 19,072.48 ±...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Swimming; NF-κB; Interleukin-6; Interleukin-10; Thiobarbituric acid reactive species; Cytokine.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011000600008
Registros recuperados: 5
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