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Hsu CK, Chang SJ, Lim LY, Chang HH, Shei-Dei Yang S. Methyl Palmitate Modulated NMDA-Induced Cerebral Hyperemia in Hypertensive Rats. J Vasc Res 2023; 60:137-147. [PMID: 37285812 DOI: 10.1159/000529916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Accepted: 02/07/2023] [Indexed: 06/09/2023] Open
Abstract
N-methyl-D-aspartate (NMDA) receptors were found to be dysfunctional in hypertensive rats. Methyl palmitate (MP) has been shown to diminish the nicotine-induced increase in blood flow in the brainstem. The aim of this study was to determine how MP modulated NMDA-induced increased regional cerebral blood flow (rCBF) in normotensive (WKY), spontaneously hypertensive (SHR), and renovascular hypertensive (RHR) rats. The increase in rCBF after the topical application of experimental drugs was measured using laser Doppler flowmetry. Topical NMDA application induced an MK-801-sensitive increase in rCBF in anesthetized WKY rats, which was inhibited by MP pretreatments. This inhibition was prevented by pretreatment with chelerythrine (a PKC inhibitor). The NMDA-induced increase in rCBF was also inhibited by the PKC activator in a concentration-dependent manner. Neither MP nor MK-801 affected the increase in rCBF induced by the topical application of acetylcholine or sodium nitroprusside. Topical application of MP to the parietal cortex of SHRs, on the other hand, increased basal rCBF slightly but significantly. MP enhanced the NMDA-induced increase in rCBF in SHRs and RHRs. These results suggested that MP had a dual effect on the modulation of rCBF. MP appears to play a significant physiological role in CBF regulation.
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Affiliation(s)
- Chun-Kai Hsu
- Division of Urology, Department of Surgery, Taipei Tzu Chi Hospital, New Taipei, Taiwan
- School of Medicine, Tzu Chi University, Hualien, Taiwan
| | | | - Li-Yi Lim
- Division of Urology, Department of Surgery, Taipei Tzu Chi Hospital, New Taipei, Taiwan
- Department of Surgery, Hospital Canselor Tuanku Muhriz UKM, Kuala Lumpur, Malaysia
| | - Hsi-Hsien Chang
- Division of Urology, Department of Surgery, Taipei Tzu Chi Hospital, New Taipei, Taiwan
| | - Stephen Shei-Dei Yang
- Division of Urology, Department of Surgery, Taipei Tzu Chi Hospital, New Taipei, Taiwan
- School of Medicine, Tzu Chi University, Hualien, Taiwan
- Taipei Tzu Chi Hospital, Buddhist Medical Foundation, New Taipei, Taiwan
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Kronbauer M, Metz VG, Roversi K, Milanesi LH, Rubert Rossato D, da Silva Barcelos RC, Burger ME. Influence of magnesium supplementation and L-type calcium channel blocker on haloperidol-induced movement disturbances. Behav Brain Res 2019; 374:112119. [PMID: 31374223 DOI: 10.1016/j.bbr.2019.112119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 06/10/2019] [Accepted: 07/28/2019] [Indexed: 11/17/2022]
Abstract
Haloperidol (Hal) is an antipsychotic related to movement disorders. Magnesium (Mg) showed benefits on orofacial dyskinesia (OD), suggesting its involvement with N-methyl-D-aspartate receptors (NMDAR) since it acts blocking calcium channels. Comparisons between nifedipine (NIF; a calcium channel blocker) and Mg were performed to establish the Mg mechanism. Male rats concomitantly received Hal and Mg or NIF for 28 days, and OD behaviors were weekly assessed. Both Mg and NIF decreased Hal-induced OD. Hal increased Ca2+-ATPase activity in the striatum, and Mg reversed it. In the cortex, both Mg and NIF decreased such activity. Dopaminergic and glutamatergic immunoreactivity were modified by Hal and treatments: i) in the cortex: Hal reduced D1R and D2R, increasing NMDAR immunoreactivity. Mg and NIF reversed this Hal influence on D1R and NMDAR, while only Mg reversed Hal effects on D2R levels; ii) in the striatum: Hal decreased D2R and increased NMDAR while Mg and NIF decreased D1R and reversed the Hal-induced decreasing D2R levels. Only Mg reversed the Hal-induced increasing NMDAR levels; iii) in the substantia nigra (SN): while Hal increased D1R, D2R, and NMDAR, both Mg and NIF reversed this influence on D2R, but only Mg reversed the Hal-influence on D1R levels. Only NIF reversed the Hal effects on NMDAR immunoreactivity. These findings allow us to propose that Mg may be useful to minimize Hal-induced movement disturbances. Mg molecular mechanism seems to be involved with a calcium channel blocker because the NIF group showed less expressive effects than the Mg group.
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Affiliation(s)
- Maikel Kronbauer
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), RS, Brazil
| | - Vinicia Garzela Metz
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), RS, Brazil
| | - Karine Roversi
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), RS, Brazil
| | - Laura H Milanesi
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), RS, Brazil
| | | | | | - Marilise E Burger
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), RS, Brazil; Departamento de Fisiologia e Farmacologia, UFSM, RS, Brazil.
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Takarada T, Kou M, Hida M, Fukumori R, Nakamura S, Kutsukake T, Kuramoto N, Hinoi E, Yoneda Y. Protective upregulation of activating transcription factor-3 against glutamate neurotoxicity in neuronal cells under ischemia. J Neurosci Res 2016; 94:378-88. [PMID: 26900013 DOI: 10.1002/jnr.23723] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Revised: 01/18/2016] [Accepted: 01/28/2016] [Indexed: 01/05/2023]
Abstract
This study evaluates the pathological role of the stress sensor activating transcription factor-3 (ATF3) in ischemic neurotoxicity. Upregulation of the transcript and protein for ATF3 was seen 2-10 hr after reperfusion in the ipsilateral cerebral hemisphere of mice with transient middle cerebral artery occlusion for 2 hr. Immunohistochemical analysis confirmed the expression of ATF3 by cells immunoreactive for a neuronal marker in neocortex, hippocampus, and striatum within 2 hr after reperfusion. In murine neocortical neurons previously cultured under ischemic conditions for 2 hr, transient upregulation of both Atf3 and ATF3 expression was similarly found during subsequent culture for 2-24 hr under normoxia. Lentiviral overexpression of ATF3 ameliorated the neurotoxicity of glutamate (Glu) in cultured murine neurons along with a slight but statistically significant inhibition of both Fluo-3 and rhodamine-2 fluorescence increases by N-methyl-D-aspartate. Similarly, transient upregulation was seen in Atf3 and ATF3 expression during the culture for 48 hr in neuronal Neuro2A cells previously cultured under ischemic conditions for 2 hr. Luciferase reporter analysis with ATF3 promoter together with immunoblotting revealed the possible involvement of several transcription factors responsive to extracellular and intracellular stressors in the transactivation of the Atf3 gene in Neuro2A cells. ATF3 could be upregulated to play a role in mechanisms underlying mitigation of the neurotoxicity mediated by the endogenous neurotoxin Glu at an early stage after ischemic signal inputs.
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Affiliation(s)
- Takeshi Takarada
- Laboratory of Molecular Pharmacology, Division of Pharmaceutical Sciences, Kanazawa University Graduate School of Medical, Pharmaceutical, and Health Sciences, Kanazawa, Ishikawa, Japan
| | - Miki Kou
- Laboratory of Molecular Pharmacology, Division of Pharmaceutical Sciences, Kanazawa University Graduate School of Medical, Pharmaceutical, and Health Sciences, Kanazawa, Ishikawa, Japan
| | - Miho Hida
- Laboratory of Molecular Pharmacology, Division of Pharmaceutical Sciences, Kanazawa University Graduate School of Medical, Pharmaceutical, and Health Sciences, Kanazawa, Ishikawa, Japan
| | - Ryo Fukumori
- Laboratory of Molecular Pharmacology, Division of Pharmaceutical Sciences, Kanazawa University Graduate School of Medical, Pharmaceutical, and Health Sciences, Kanazawa, Ishikawa, Japan
| | - Saki Nakamura
- Laboratory of Molecular Pharmacology, Division of Pharmaceutical Sciences, Kanazawa University Graduate School of Medical, Pharmaceutical, and Health Sciences, Kanazawa, Ishikawa, Japan
| | - Takaya Kutsukake
- Laboratory of Molecular Pharmacology, Division of Pharmaceutical Sciences, Kanazawa University Graduate School of Medical, Pharmaceutical, and Health Sciences, Kanazawa, Ishikawa, Japan
| | - Nobuyuki Kuramoto
- Department of Toxicology, Setsunan University, Hirakata, Osaka, Japan
| | - Eiichi Hinoi
- Laboratory of Molecular Pharmacology, Division of Pharmaceutical Sciences, Kanazawa University Graduate School of Medical, Pharmaceutical, and Health Sciences, Kanazawa, Ishikawa, Japan
| | - Yukio Yoneda
- Laboratory of Molecular Pharmacology, Division of Pharmaceutical Sciences, Kanazawa University Graduate School of Medical, Pharmaceutical, and Health Sciences, Kanazawa, Ishikawa, Japan
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Niimi K, Han Y, Zhou Y, Yoshimoto T, Dai F, Teng X, Tian X, Li W, Takahashi E. Blockade of Cav2.1-mediated NMDA receptor signaling disrupts conditioned fear extinction. Behav Brain Res 2013; 259:45-9. [PMID: 24177210 DOI: 10.1016/j.bbr.2013.10.033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Revised: 10/17/2013] [Accepted: 10/20/2013] [Indexed: 12/30/2022]
Abstract
Although fear extinction requires N-methyl-d-aspartate (NMDA) receptor signaling, Cav2.1-regulated synaptic function in extinction remains unknown. This study examined whether Cav2.1-mediated signaling plays role in consolidation of extinction. Wild-type mice received intracerebroventricular injection of Cav2.1 blocker (ω-agatoxin IVA, 4.0 pg/side) showed impaired extinction behavior and increased expression of CREB-dependent gene Arc in medial prefrontal cortex (mPFC). Intra-mPFC injections of NMDA receptor antagonist (MK-801, 0.5 μg/midline), which was ineffective in wild-type controls, blocked extinction in heterozygous rolling Nagoya (rol/+) mice carrying Cav2.1α1 gene mutation rol/+ mice. These results indicate that Cav2.1-mediated NMDA receptor signaling is functional pathway in mPFC-dependent fear extinction. Our results also indicate that the combination of pharmacological and genetic approaches can be used to study functional signaling pathways in neuronal circuits.
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Affiliation(s)
- Kimie Niimi
- Research Resources Center, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Yanfei Han
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai 200240, PR China
| | - Ying Zhou
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai 200240, PR China
| | - Takuro Yoshimoto
- Research Resources Center, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Fu Dai
- Hefei First People's Hospital, Huaihe Road 390, Hefei 230061, PR China
| | - Xiaochun Teng
- Department of Endocrinology and Metabolism, The First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, PR China
| | - Xiaoli Tian
- Division of Pulmonary and Critical Care Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA 90095-1690, USA
| | - Weidong Li
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai 200240, PR China.
| | - Eiki Takahashi
- Research Resources Center, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai 200240, PR China.
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Pu F, Kaneko T, Enoki M, Irie K, Okamoto T, Sei Y, Egashira N, Oishi R, Mishima K, Kamimura H, Iwasaki K, Fujiwara M. Ameliorating effects of Kangen-karyu on neuronal damage in rats subjected to repeated cerebral ischemia. J Nat Med 2010; 64:167-74. [DOI: 10.1007/s11418-010-0392-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2009] [Accepted: 01/07/2010] [Indexed: 01/10/2023]
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Vegh MG, Kovács AD, Kovács G, Szabó G, Tihanyi K, Hársing LG, Lévay G. The new 2,3-benzodiazepine derivative EGIS-8332 inhibits AMPA/kainate ion channels and cell death. Neurochem Int 2007; 50:555-63. [PMID: 17147974 DOI: 10.1016/j.neuint.2006.11.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2006] [Revised: 10/27/2006] [Accepted: 11/07/2006] [Indexed: 11/16/2022]
Abstract
We observed in vitro neuroprotective and AMPA/kainate receptor antagonist effects of the new 2,3-benzodiazepine derivative EGIS-8332 (R,S-1-(4-aminophenyl)-7,8-methylenedioxy-4-cyano-4-methyl-3-N-acetyl-5H-3,4-dihydro-2,3-benzodiazepine) using the lactate dehydrogenase (LDH) release assay and patch clamp recordings on primary cultures of rat embryonic telencephalon neurons exposed to AMPA/kainate receptor agonists. EGIS-8332 potently decreased alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionate (AMPA) and quisqualate induced LDH release (IC(50)=5.2+/-0.4 and 7.4+/-1.3 microM, respectively) from the cells. Whole-cell patch clamp studies carried out on the ionotropic glutamate receptors N-methyl D-aspartate (NMDA), as well as AMPA (and kainate) in cultured telencephalon neurons verified that EGIS-8332 blocked steady state responses to AMPA and kainate (IC(50)=1.7+/-0.4 and 6.2+/-1.6 microM, respectively), but hardly influenced currents evoked by NMDA. EGIS-8332 also inhibited kainate-evoked response in CHO cells expressing the flop variant of GluR1 receptor and, in cerebellar Purkinje cells at similar efficiency. The stereoselectivity of the inhibitory site is established by the clearly dissimilar inhibitory potency of the enantiomer components of EGIS-8332 differing in the configuration of methyl and cyano substituents on carbon C(4): the R(-) enantiomer was found to be the efficient species. This finding suggests that the inhibitory interaction between the channel protein and drug is promoted by presence of the C(4) methyl group. The inhibition of the AMPA/kainate ion channels by EGIS-8332 is non-competitive, not use dependent, and depends neither on the closed/open state of the channel, nor the membrane potential. These findings suggest an allosteric mechanism for the inhibition. These in vitro observations suggest that the compound might be useful in the treatments of certain acute and chronic neurological syndromes initiated by derangements of ionotropic glutamate receptor function.
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Affiliation(s)
- Miklos G Vegh
- Department of CNS Pharmacology, Division of Preclinical Research at EGIS Pharmaceuticals Plc, H-1475 Budapest 10, POB 100, Budapest, Hungary
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Vallazza-Deschamps G, Fuchs C, Cia D, Tessier LH, Sahel JAA, Dreyfus H, Picaud S. Diltiazem-induced neuroprotection in glutamate excitotoxicity and ischemic insult of retinal neurons. Doc Ophthalmol 2006; 110:25-35. [PMID: 16249955 DOI: 10.1007/s10633-005-7341-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
PURPOSE Cell death is often related to an abnormal increase in Ca(2+) flux. In the retina, Ca(2+) channels are mainly from the L-type that do not inactivate with time. Under excitotoxic and ischemic conditions, their continuous activation may therefore contribute significantly to the lethal Ca(2+) influx. To assess this hypothesis, the Ca(2+) channel blocker, diltiazem, was applied in excitotoxic and ischemic conditions. METHODS To induce excitotoxicity, retinal cell cultures from newborn rats were incubated with glutamate. The toxicity of glutamate was quantified by neuronal immunostaining with an antibody directed against the neuron specific enolase. Glutamate receptor function in vitro was assessed in pig retinal cell cultures by patch clamp recording. Retinal ischemia was induced by raising the intraocular pressure in adult rats. Retinal cell loss was quantified on retinal sections by measuring nuclear cell densities. RESULTS In retinal cell culture, glutamate application induced a major cell loss. This cell loss was attributed to glutamate excitotoxicity because glutamate receptor blockers like MK-801 and CNQX increased significantly neuronal survival. MK-801 and CNQX, which block NMDA and AMPA/Kainate receptors, respectively, had additive effects. Expression of AMPA/Kainate glutamate receptors in mixed adult retinal cell cultures was attested by patch clamp recording. In newborn rat retinal culture, glutamate excitotoxicity was significantly reduced by addition of the L-type Ca(2+) channel blocker, diltiazem. In in vivo experiments, the increase in ocular pressure induced a decrease in cell number in the inner nuclear and ganglion cell layers. When animals received diltiazem injections, the ischemic treatment induced a less severe reduction in retinal cells; this neuroprotection was statistically significant in the ganglion cell layer. CONCLUSION These results are consistent with previous studies suggesting that Ca(2+) channel activation contributes to retinal cell death following either glutamate excitotoxicity or retinal ischemia. Under both conditions, the L-type Ca(2+) channel blocker, diltiazem, can limit cell death. These results extend the potential application of diltiazem in retinal neuroprotection to retinal pathologies involving glutamate excitotoxicity and ischemia.
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Affiliation(s)
- Géraldine Vallazza-Deschamps
- Laboratoire de Physiopathologie Cellulaire et Moléculaire de la Rétine, UPMC, INSERM U-592, Hôpital Saint-Antoine, Bâtiment Kourilsky, Paris, France
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Pu F, Mishima K, Irie K, Egashira N, Ishibashi D, Matsumoto Y, Ikeda T, Iwasaki K, Fujii H, Kosuna K, Fujiwara M. Differential Effects of Buckwheat and Kudingcha Extract on Neuronal Damage in Cultured Hippocampal Neurons and Spatial Memory Impairment Induced by Scopolamine in an Eight-Arm Radial Maze. ACTA ACUST UNITED AC 2005. [DOI: 10.1248/jhs.51.636] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Fengling Pu
- Department of Neuropharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University
| | - Kenichi Mishima
- Department of Neuropharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University
| | - Keiichi Irie
- Department of Neuropharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University
| | - Nobuaki Egashira
- Department of Neuropharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University
| | - Daisuke Ishibashi
- Department of Neuropharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University
| | - Yoshiaki Matsumoto
- Department of Neuropharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University
| | - Tomoaki Ikeda
- Department of Obstetrics and Gynecology, Miyazaki Medical College, University of Miyazaki
| | - Katsunori Iwasaki
- Department of Neuropharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University
| | | | | | - Michihiro Fujiwara
- Department of Neuropharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University
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Lu Y, Rubel EW. Activation of metabotropic glutamate receptors inhibits high-voltage-gated calcium channel currents of chicken nucleus magnocellularis neurons. J Neurophysiol 2004; 93:1418-28. [PMID: 15371493 DOI: 10.1152/jn.00659.2004] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Using whole cell patch-clamp recordings, we pharmacologically characterized the voltage-gated Ca2+ channel (VGCC) currents of chicken nucleus magnocellularis (NM) neurons using barium as the charge carrier. NM neurons possessed both low- and high-voltage-activated Ca2+ channel currents (HVA I(Ba2+)). The N-type channel blocker (omega-conotoxin-GVIA) inhibited more than half of the total HVA I(Ba2+), whereas blockers of L- and P/Q-type channels each inhibited a small fraction of the current. Metabotropic glutamate receptor (mGluR)-mediated modulation of the HVA I(Ba2+) was examined by bath application of glutamate (100 microM), which inhibited the HVA I(Ba2+) by an average of 16%. The inhibitory effect was dose dependent and was partially blocked by omega-conotoxin-GVIA, indicating that mGluRs modulate N and other type HVA I(Ba2+). The nonspecific mGluR agonist, (1S,3R)-1-aminocyclopentane-1,3-dicarbosylic acid (1S,3R-ACPD), mimicked the inhibitory effect of glutamate on HVA I(Ba2+). Group I-III mGluR agonists showed inhibition of the HVA current with the most potent being the group III agonist L(+)-2-amino-4-phosphonobutyric acid. 1S,3R-ACPD (200 microM) had no effect on K+ or Na+ currents. The firing properties of NM neurons were also not altered by 1S,3R-ACPD. We propose that the inhibition of VGCC currents by mGluRs limits depolarization-induced Ca2+ entry into these highly active NM neurons and regulates their Ca2+ homeostasis.
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Affiliation(s)
- Yong Lu
- Virginia Merrill Bloedel Hearing Research Center and Department of Otolaryngology-Head and Neck Surgery, University of Washington, Box 357923, Seattle, WA 98195, USA
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