Abstract:
:Previous experimental results from our laboratory demonstrated that monocyte chemoattractant protein-1 (MCP-1) depolarizes or increases the excitability of nociceptive neurons in the intact dorsal root ganglion (DRG) after a chronic compression of the DRG (CCD), an injury that upregulates neuronal expression of both MCP-1 and mRNA for its receptor CCR2. We presently explore the ionic mechanisms underlying the excitatory effects of MCP-1. MCP-1 (100 nM) was applied, after CCD, to acutely dissociated small DRG neurons with nociceptive properties. Under current clamp, the proportion of neurons depolarized was similar to that previously observed for CCD-treated neurons in the intact ganglion, although the magnitude of depolarization was greater. MCP-1 induced a decrease in rheobase by 44 +/- 10% and some cells became spontaneously active at resting potential. Action potential width at a voltage equal to 10% of the peak height was increased from 4.94 +/- 0.23 to 5.90 +/- 0.47 ms. In voltage clamp, MCP-1 induced an inward current in 27 of 50 neurons held at -60 mV, which increased with concentration over the range of 3 to 300 nM (EC(50) = 45 nM). The MCP-1-induced current was not voltage dependent and had an estimated reversal potential of -27 mV. In addition, MCP-1 inhibited a voltage-dependent, noninactivating outward current, presumably a delayed rectifier type K(+) conductance. We conclude that MCP-1 enhances excitability in CCD neurons by, at least, two mechanisms: 1) activation of a nonvoltage-dependent depolarizing current with characteristics similar to a nonselective cation conductance and 2) inhibition of a voltage-dependent outward current.
journal_name
J Neurophysioljournal_title
Journal of neurophysiologyauthors
Sun JH,Yang B,Donnelly DF,Ma C,LaMotte RHdoi
10.1152/jn.00222.2006subject
Has Abstractpub_date
2006-11-01 00:00:00pages
2189-99issue
5eissn
0022-3077issn
1522-1598pii
00222.2006journal_volume
96pub_type
杂志文章abstract::Substance P (SP) hyperpolarizes approximately 80% of ferret vagal sensory neurons (nodose ganglion neurons) via NK-1 receptor-mediated activation of a potassium current (IK). A depolarizing current activated by membrane hyperpolarization could minimize the SP-induced hyperpolarization. Such a current exists in 65% of ...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1998.79.2.769
更新日期:1998-02-01 00:00:00
abstract::1. We recorded single cell activities in the caudate nucleus of the monkeys trained to perform a series of visuomotor tasks. In the first part of this paper, we summarize the types and locations of neurons in the monkey caudate nucleus. In the second part, we report the characteristics of neurons related to saccadic e...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1989.61.4.780
更新日期:1989-04-01 00:00:00
abstract::We have previously reported that short-term (48-72 h) exposure to the GABA-modulatory steroid 3alpha-OH-5alpha-pregnan-20-one (3alpha,5alpha-THP) increases expression of the alpha4 subunit of the GABA(A) receptor (GABAR) in the hippocampus of adult rats. This change in subunit composition was accompanied by altered ph...
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更新日期:2003-04-01 00:00:00
abstract::1. We studied the organization of motor units in the tenuissimus (TEN) muscle of pentobarbital-anesthetized cats. The cat TEN is a long, delicate straplike muscle that spans hip and knee, which has a very flat length-tension curve through 22 mm of length change. 2. The TEN motor nucleus, labeled by retrograde transpor...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1988.59.4.1128
更新日期:1988-04-01 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
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journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1991.66.2.623
更新日期:1991-08-01 00:00:00
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pub_type: 临床试验,杂志文章
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更新日期:2002-01-01 00:00:00
abstract::Studies on animals have shown that noise-induced hearing loss is followed by an increase of spontaneous firing at several stages of the central auditory system. This central hyperactivity has been suggested to underpin the perception of tinnitus. It was shown that decreasing cochlear activity can abolish the noise-ind...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00580.2014
更新日期:2015-01-01 00:00:00
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journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1983.49.3.567
更新日期:1983-03-01 00:00:00
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journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00541.2018
更新日期:2019-02-01 00:00:00
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pub_type: 杂志文章
doi:10.1152/jn.00966.2007
更新日期:2008-03-01 00:00:00
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journal_title:Journal of neurophysiology
pub_type: 杂志文章,评审
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更新日期:2014-11-01 00:00:00
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journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00145.2014
更新日期:2014-12-01 00:00:00
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journal_title:Journal of neurophysiology
pub_type: 杂志文章
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更新日期:2018-11-01 00:00:00
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journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00317.2006
更新日期:2007-03-01 00:00:00
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journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1995.73.1.141
更新日期:1995-01-01 00:00:00
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journal_title:Journal of neurophysiology
pub_type: 杂志文章
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更新日期:2013-09-01 00:00:00
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journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00862.2016
更新日期:2017-07-01 00:00:00
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pub_type: 杂志文章
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更新日期:2015-04-01 00:00:00
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更新日期:2016-06-01 00:00:00
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journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1992.68.3.653
更新日期:1992-09-01 00:00:00
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journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1989.62.5.1069
更新日期:1989-11-01 00:00:00
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journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.00837.2002
更新日期:2003-04-01 00:00:00
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journal_title:Journal of neurophysiology
pub_type: 杂志文章
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更新日期:2008-01-01 00:00:00
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pub_type: 杂志文章
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更新日期:2007-11-01 00:00:00
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journal_title:Journal of neurophysiology
pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:1996-04-01 00:00:00
abstract::The role of potassium channels in regulating spontaneous firing and sound-evoked responses in the central nucleus of the inferior colliculus was studied by recording single-unit activity before and during iontophoretic application of a nonspecific potassium channel blocker, tetraethylammonium (TEA). Tone bursts and si...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
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更新日期:2004-05-01 00:00:00
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journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1995.74.2.763
更新日期:1995-08-01 00:00:00
abstract::1. The regularity of the sustaining fiber (SF) steady-state discharge increases with the intensity of a uniform field of illumination. 2. In a high levels of illumination SFs exhibit a highly periodic or rhythmically bursting steady-state discharge. 3. The period of the burst cycle is independent of the light intensit...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
doi:10.1152/jn.1976.39.6.1257
更新日期:1976-11-01 00:00:00
abstract::The GABA withdrawal syndrome (GWS) is a model of local status epilepticus consecutive to the interruption of a prolonged GABA infusion into the rat somatomotor cortex. Bursting patterns in slices from GWS rats include intrinsic bursts of action potentials (APs) induced by intracellular depolarizing current injection a...
journal_title:Journal of neurophysiology
pub_type: 杂志文章
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更新日期:2001-05-01 00:00:00