Abstract:
:Differential Modulation by Copper and Zinc of P2X2 and P2X4 Receptor Function. The modulation by Cu2+ and Zn2+ of P2X2 and P2X4 receptors expressed in Xenopus oocytes was studied with the two-electrode, voltage-clamp technique. In oocytes expressing P2X2 receptors, both Cu2+ and Zn2+, in the concentration range 1-130 microM, reversibly potentiated current activated by submaximal concentrations of ATP. The Cu2+ and Zn2+ concentrations that produced 50% of maximal potentiation (EC50) of current activated by 50 microM ATP were 16.3 +/- 0.9 (SE) microM and 19.6 +/- 1.5 microM, respectively. Cu2+ and Zn2+ potentiation of ATP-activated current was independent of membrane potential between -80 and +20 mV and did not involve a shift in the reversal potential of the current. Like Zn2+, Cu2+ increased the apparent affinity of the receptor for ATP, as evidenced by a parallel shift of the ATP concentration-response curve to the left. However, Cu2+ did not enhance ATP-activated current in the presence of a maximally effective concentration of Zn2+, suggesting a common site or mechanism of action of Cu2+ and Zn2+ on P2X2 receptors. For the P2X4 receptor, Zn2+, from 0.5 to 20 microM enhanced current activated by 5 microM ATP with an EC50 value of 2.4 +/- 0.2 microM. Zn2+ shifted the ATP concentration-response curve to the left in a parallel manner, and potentiation by Zn2+ was voltage independent. By contrast, Cu2+ in a similar concentration range did not affect ATP-activated current in oocytes expressing P2X4 receptors, and Cu2+ did not alter the potentiation of ATP-activated current produced by Zn2+. The results suggest that Cu2+ and Zn2+ differentially modulate the function of P2X2 and P2X4 receptors, perhaps because of differences in a shared site of action on both subunits or the absence of a site for Cu2+ action on the P2X4 receptor.
journal_name
J Neurophysioljournal_title
Journal of neurophysiologyauthors
Xiong K,Peoples RW,Montgomery JP,Chiang Y,Stewart RR,Weight FF,Li Cdoi
10.1152/jn.1999.81.5.2088subject
Has Abstractpub_date
1999-05-01 00:00:00pages
2088-94issue
5eissn
0022-3077issn
1522-1598journal_volume
81pub_type
杂志文章abstract::Neurons in many cortical areas involved in visuospatial processing represent remembered spatial information in retinotopic coordinates. During a gaze shift, the retinotopic representation of a target location that is fixed in the world (world-fixed reference frame) must be updated, whereas the representation of a targ...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00277.2003
更新日期:2004-04-01 00:00:00
abstract::The century-old duplex theory of sound localization posits that low- and high-frequency sounds are localized with two different acoustical cues, interaural time and level differences (ITDs and ILDs), respectively. While behavioral studies in humans and behavioral and neurophysiological studies in a variety of animal m...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00062.2015
更新日期:2015-07-01 00:00:00
abstract::1. Teased axon recordings were made from 167 spontaneously active A beta- and A delta-afferents that ended in sciatic nerve end neuromas of 6-12 days standing. When challenged with a standard bolus of systemically applied adrenaline, 100 (60%) responded, either with an increase in baseline firing frequency (excitation...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1996.76.6.3721
更新日期:1996-12-01 00:00:00
abstract::Noise is a major concern in circuits processing electrical signals, including neural circuits. There are many factors that influence how noise propagates through neural circuits, and there are few systems in which noise levels have been studied throughout a processing pathway. We recorded intracellularly from multiple...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00607.2011
更新日期:2012-02-01 00:00:00
abstract::Rats can readily be trained to jump a gap of around 16 cm in the dark and a considerably larger gap in the light for a food reward. In the light, they use vision to estimate the distance to be jumped. In the dark, they use their vibrissae at the farthest distances. Bilateral whisker shaving or barrel field lesions red...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.2000.84.4.1781
更新日期:2000-10-01 00:00:00
abstract::We are studying the functional "logic" of neuromodulatory actions in a simple central pattern generator (CPG)-effector system, the heart of the blue crab Callinectes sapidus. The rhythmic contractions of this heart are neurogenic, driven by rhythmic motor patterns generated by the cardiac ganglion (CG). Here we used a...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00558.2007
更新日期:2007-11-01 00:00:00
abstract::Through their actions in the nucleus accumbens (NAc), kappa opioid (KOP) receptors and their endogenous ligand, dynorphin, modify behaviors associated with the administration of drugs of abuse and are regulated by exposure to such drugs. Despite their demonstrated behavioral significance, the synaptic actions of KOP r...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.01115.2002
更新日期:2003-05-01 00:00:00
abstract::Experiments were performed on human elbow flexor and extensor muscles and jaw-opening and -closing muscles to observe the effect on rhythmic movements of sudden loading. The load was provided by an electromagnetic device, which simulated the appearance of a smoothly increasing spring-like load. The responses to this l...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1999.82.3.1209
更新日期:1999-09-01 00:00:00
abstract::Training rats to perform rapidly and efficiently in an olfactory discrimination task results in robust enhancement of excitatory and inhibitory synaptic connectivity in the rat piriform cortex, which is maintained for days after training. To explore the mechanisms by which such synaptic enhancement occurs, we recorded...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00356.2011
更新日期:2012-02-01 00:00:00
abstract::Coherence analysis has the ability to identify the presence of common descending drive shared by motor unit pools and reveals its spectral properties. However, the link between spectral properties of shared neural drive and functional interactions among muscles remains unclear. We assessed shared neural drive between ...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00204.2017
更新日期:2017-09-01 00:00:00
abstract::Rewards in the natural environment are rarely predicted with complete certainty. Uncertainty relating to future rewards has typically been defined as the variance of the potential outcomes. However, the asymmetry of predicted reward distributions, known as skewness, constitutes a distinct but neuroscientifically under...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00471.2011
更新日期:2011-11-01 00:00:00
abstract::Increasing evidence demonstrates that modulating the cGMP-dependent protein kinase G (PKG) pathway produces an array of behavioral phenotypes in the fruit fly, Drosophila melanogaster. Altering PKG activity, either genetically via the foraging (for) gene or using pharmacology modifies tolerance to acute abiotic stress...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00784.2011
更新日期:2013-02-01 00:00:00
abstract::1. Less than two segments of the cervical spinal cord of the mudpuppy (Necturus maculatus) is sufficient to generate a locomotor rhythm with application of N-methyl-D-aspartic acid (NMDA). We have recorded intracellularly from rhythmically active interneurons in these segments and classified them according to their ph...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1994.71.6.2025
更新日期:1994-06-01 00:00:00
abstract::The whole cell patch-clamp technique in combination with the slice preparation was used to investigate the electrophysiological properties of pigeon semicircular canal sensory and supporting cells. These properties were also characterized in regenerating neuroepithelia of pigeons preinjected with streptomycin to kill ...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1997.78.4.1913
更新日期:1997-10-01 00:00:00
abstract::To estimate contour-orientation sensitivity of the cat and the degree to which precortical processing contributes to such estimates, the amplitude of visually evoked potentials (VEP) recorded from the visual cortex of cats in response to a visual stimulus (S2) presented at various intervals after presentation of anoth...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1985.53.5.1287
更新日期:1985-05-01 00:00:00
abstract::1. Eye movements were recorded before and after bilateral occipital lobectomy in six rhesus monkeys trained to fixate and to follow small targets. Striate cortex was completely removed in two animals; small islands islands remained in the others. In all animals portions of extrastriate cortex were also removed but the...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1987.58.4.883
更新日期:1987-10-01 00:00:00
abstract::Octopus cells in the posteroventral cochlear nucleus (PVCN) of mammals are biophysically specialized to detect coincident firing in the population of auditory nerve fibers that provide their synaptic input and to convey its occurrence with temporal precision. The precision in the timing of action potentials depends on...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.2001.86.5.2299
更新日期:2001-11-01 00:00:00
abstract::The spider VS-3 slit-sense organ contains two types of primary mechanoreceptor neurons that are morphologically similar but have different electrical behavior. Type A neurons fire only one or two action potentials in response to a mechanical or electrical step of any amplitude above the threshold, whereas type B neuro...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00440.2001
更新日期:2002-03-01 00:00:00
abstract::Experience-dependent modification in the electrical properties of central neurons is a form of intrinsic plasticity that occurs during development and has been observed following behavioral learning. We report a novel form of intrinsic plasticity in hippocampal CA1 pyramidal neurons mediated by the KV7/KCNQ and CaV1/L...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.90346.2008
更新日期:2008-10-01 00:00:00
abstract::1. Whole cell current-clamp recordings show that odors not only depolarize but may also hyperpolarize lobster olfactory receptor cells. Odor-evoked hyperpolarizations occurred in 36% of 178 receptor cells examined. Cell-attached recordings of action potentials followed by current-clamp recordings in the same cell indi...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1991.65.3.446
更新日期:1991-03-01 00:00:00
abstract::Odorants induce specific modulation of mitral/tufted (MT) cells' firing rate in the mammalian olfactory bulb (OB), inducing temporal patterns of neuronal discharge embedded in an oscillatory local field potential (LFP). While most studies have examined anesthetized animals, little is known about the firing rate and te...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00095.2008
更新日期:2008-07-01 00:00:00
abstract::Precise motion control is critical to human survival on Earth and in space. Motion sensation is inherently imprecise, and the functional implications of this imprecision are not well understood. We studied a "vestibular" manual control task in which subjects attempted to keep themselves upright with a rotational hand ...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00565.2018
更新日期:2018-12-01 00:00:00
abstract::Dopaminergic modulation of neuronal networks in the dorsolateral prefrontal cortex (PFC) is believed to play an important role in information processing during working memory tasks in both humans and nonhuman primates. To understand the basic cellular mechanisms that underlie these actions of dopamine (DA), we have in...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.2000.84.6.2799
更新日期:2000-12-01 00:00:00
abstract::Seizures may cause brain damage due to mechanisms initiated by excessive excitatory synaptic transmission. One such mechanism is the activation of death-promoting intracellular cascades by the influx and the perturbed homeostasis of Ca2+. The neuroprotective effects of preventing the entry of Ca2+ from voltage-depende...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1999.81.6.3054
更新日期:1999-06-01 00:00:00
abstract::Using CFos-EGFP transgenic mice (P6-P12), we targeted persistent inward current (PIC) in the spinal interneurons activated by locomotion. Following a locomotor task, whole cell patch-clamp recordings were obtained from ventral EGFP+ neurons in spinal cord slices (200-250 μm from T₁₃-L₄). PIC was recorded by a family o...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.01111.2009
更新日期:2010-04-01 00:00:00
abstract::The lability of the responses of mammalian central neurons to gamma-aminobutyric acid (GABA) was studied using neurons acutely dissociated from the CA1 region of the adult guinea pig hippocampus as a model system. GABA was applied to the neuronal somata by pressure ejection and the resulting current (IGABA) recorded u...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1986.56.1.1
更新日期:1986-07-01 00:00:00
abstract::Neural correlates of gap detection in three auditory cortical fields in the cat. Mimimum detectable gaps in noise in humans are independent of the position of the gap, whereas in cat primary auditory cortex (AI) they are position dependent. The position dependence in other cortical areas is not known and may resolve t...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1999.81.5.2570
更新日期:1999-05-01 00:00:00
abstract::In neuroendocrine cells, hormone release often requires a collective burst of action potentials synchronized by gap junctions. This is the case for the electrically coupled bag cell neurons in the reproductive system of the marine snail, Aplysia californica. These neuroendocrine cells are found in two clusters, and fi...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00494.2014
更新日期:2014-12-01 00:00:00
abstract::The centre médian-parafascicular (CM-Pf) complex is located at the posterior intralaminar nuclei of the thalamus and forms part of the nonspecific thalamocortical projection system and the internal circuit of the basal ganglia. However, the functional roles of this complex remain to be fully elucidated. Here we have e...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.2002.87.6.3090
更新日期:2002-06-01 00:00:00
abstract::Rectification of surface EMG before spectral analysis is a well-established preprocessing method used in the detection of motor unit firing patterns. A number of recent studies have called into question the need for rectification before spectral analysis, pointing out that there is no supporting experimental evidence ...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00296.2013
更新日期:2013-10-01 00:00:00