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4 edition of Pharmacological agents against the neuronal voltage-sensitive calcium channels found in the catalog.

Pharmacological agents against the neuronal voltage-sensitive calcium channels

Pharmacological agents against the neuronal voltage-sensitive calcium channels

development of probes to characterize the cellular and molecular dynamics of neuronal calcium channels.

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Published by National Library of Canada in Ottawa .
Written in English


Edition Notes

Thesis (M.Sc.) -- University of Toronto, 1995.

SeriesCanadian theses = -- Thèses canadiennes
The Physical Object
FormatMicroform
Pagination2 microfiches : negative. --
ID Numbers
Open LibraryOL17259476M
ISBN 100612021033
OCLC/WorldCa46500426

Calcium enters the cell primarily through voltage-sensitive calcium channels, ionotropic glutamate receptors, and transient receptor potential (TRP) channels. Understanding the mechanisms that regulate the expression and localization of these channels can provide additional insight into the process of neuronal differentiation and the generation.   L-type channels activate at negative voltages. We first compared current-voltage profiles of neuronal Ca V and Ca V L-type currents with neuronal Ca V and Ca V channels. Ca V and Ca V channels underlie L-type currents in the majority of neurons. Ca V N-type channels represent a classic fast-activating, high-voltage-activated, presynaptic calcium channel, .

Mibefradil is a recently developed calcium channel blocker with a unique chemical structure, site of action, and set of pharmacologic and clinical effects. 38 Unlike other calcium antagonists, which block only L-type calcium channels, mibefradil acts on both L-type and T-type calcium channels, but with a marked selectivity for T-type channels. ω-Conotoxins and neuroprotection. Increases in [Ca 2+] i promote ischemia-induced neuronal injury. ω-Conotoxins, as blockers of N-type calcium channels, have the potential to promote neuroprotection through at least three mechanisms: (i) direct inhibition of Ca 2+ influx through N-type calcium channels; (ii) indirect inhibition of N-type calcium channel-mediated release of presynaptic.

L‐type calcium channels (LTCs) are mostly post‐synaptic channels regulating neuronal firing and gene expression. They play a role in important physio‐pathological processes such as learning and memory, Parkinson's disease, autism and, as recognized more recently, in the pathophysiology of pain processes. Traumatic brain injury (TBI) is a leading cause of death and disability in the United States. Despite more than 30 years of research, no pharmacological agents have been identified that improve neurological function following TBI. However, several lines of research described in this review provide support for further development of voltage gated calcium channel (VGCC) antagonists as potential.


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Pharmacological agents against the neuronal voltage-sensitive calcium channels Download PDF EPUB FB2

The α1 subunits that form the pore of the neuronal calcium channels are the products of different gene families: Ca V 1 (former α1C) encoding L-type, Ca V (α1A) encoding P/Q-type, Ca V (α1B) encoding N-type, and Ca V (α1E) encoding R-type HVA current.

Most HVA channels activate over a similar voltage range and are completely Cited by: J.G. McGivern, J.F. Worley III, in Comprehensive Medicinal Chemistry II, Prototypical Therapeutics. Many pharmacological agents that target voltage-gated K + channels are of proven therapeutic utility or are in various stages of clinical development.

The rationale for targeting specific voltage-gated K + channel subtypes for disease management arises from several forms of target. Calcium channel blockers: The prominent roll of calcium in the excitotoxic process has led to many attempts to develop therapies to inhibit voltage-sensitive calcium channels.

Nimodipine and flunarizine are calcium channel blockers that have been shown to reduce infarct size in animal models of permanent and transient focal cerebral ischaemia. Introduction.

Transient receptor potential (TRP) channels belong to a large and diverse family of integral proteins whose presence has been reported from bacteria to the highest taxonomic class of mammals [1,2].Genes for TRP proteins were first identified in Drosophila melanogaster as photoreceptors in the late s and early s; when a visually impaired fruit fly mutant showed a Author: Pavan Thapak, Bhupesh Vaidya, Hem Chandra Joshi, Jitendra N.

Singh, Shyam S. Sharma. The current study examined the neuroprotective capacity of ziconotide (SNX), a selective blocker of neuronal N-type voltage-sensitive calcium channels (VSCCs), in a rat model of transient spinal ischemia.

Ziconotide was first tested against the least severe ischemic interval that consistently produced spinal by: Voltage-gated calcium channels are required for many key functions in the body.

Pharmacological agents against the neuronal voltage-sensitive calcium channels book this review, the different subtypes of voltage-gated calcium channels are described and their physiologic roles and pharmacology are outlined.

We describe the current uses of drugs interacting with the different calcium channel subtypes and subunits, as well as specific areas in which there is strong potential. To determine which types of voltage-activated calcium channels are present in the rat oesophagus, an immunohistochemical study was performed using specific antibodies for the alpha1 subunits of.

These channels have overlapping physiological roles and pharmacological profiles, making it difficult to assign aspects of the anesthetic state to individual channel types. Here, we will focus on the function of neuronal voltage-gated calcium channels in mediating the effects of general anesthetics.

CNG channels also have been found to be blocked by a variety of other pharmacological agents (reviewed in Brown et al., ), but none have been found to bind with sufficient affinity and specificity. This also has been true for pharmacological agents against HCN channels, where the focus often has been K + channel blockers.

VOLTAGE-GATED CA 2+ CHANNELS. Calcium ions (Ca 2+) exist at a higher level of concentration outside the cell membrane (~2 mM) than inside (~ nM).The Ca 2+ gradient is maintained until the activation of VGCCs by membrane depolarization, which is evoked by activation of ligand gated ion channels or GPCRs.

The resulting Ca 2+ influx (10 to times increase of intracellular Ca 2+) plays. [1] [2] [3][4][5] Two major classes include those that conduct sodium ions, and are thus known as voltage sensitive sodium channels or VSSCs, 6 and those that conduct calcium ions, known as.

Lampe RA, Defeo PA, Davison MD, Young J, Herman JL, Spreen RC, Horn MB, Mangano TJ, Keith RA. Isolation and pharmacological characterization of omega-grammotoxin SIA, a novel peptide inhibitor of neuronal voltage-sensitive calcium channel responses.

Mol Pharmacol. Aug; 44 (2)– Mammalian genomes contain seven 1 subunit genes encoding the HVA calcium channel family; Ca v 11 1S, Ca v (1C), Ca v 13 1D) and Ca v 14 1F) all encode distinct L-type calcium channels, Ca. Carbone E, Lux HD () Sodium currents through neuronal calcium channels: kinetics and sensitivity to calcium antagonists.

In: Morad M, Nayler W, Kazda S, Schramm M (eds) The calcium channel: structure, function and implications. Springer, Berlin Heidelberg New. Calcium Channels. Voltage-gated calcium channels are also important drug targets.

Phenylalkylamine calcium channel blockers like verapamil are used in the treatment of atrial arrhythmias, as are benzothiazepines like diltiazem (Sampson and Kass, ).These drugs are thought to act at receptor site(s) in the pore of the calcium channels and block them, much like sodium channel–blocking.

R-type (CaV) channels, however, have been implicated in neuronal hyperexcitability in SNL rats (Matthews et al., ). Effects of calcium channel modulators in the pain neuraxis. In theory, state‐dependent blockers would circumvent the confounds of blocking calcium channels by targeting high‐frequency neuronal firing associated with neuropathic pain.

In this aspect, compounds such as CNV (Ca v ), ABT‐ (Ca v ) and Z (Ca v ), which exhibit activation state dependency, were generally well. Peptide toxins have proved to be useful agents, both in discriminating between different components of native calcium channel currents and in the molecular isolation and designation of their cloned channel counterparts.

Here, we describe the isolation and characterization of the biochemical and physiological properties of a novel amino acid peptide toxin (DW) extracted from the venom of. A number of pharmacological agents have recently become available that are capable of limiting or blocking calcium passage through cellular membrane channels.

These drugs are termed calcium antagonists or calcium channel or calcium entry blockers. Cell membranes of smooth muscle and nerve cells have several different calcium channels which may. Pregabalin is thought to access the central nervous system (CNS) via the system L amino acid transporter 5,6 and act via modulation of the R 2 -δ subunit of voltage-gated calcium channels.

7, 8. McGuire D, Bowersox S, Fellmann JD, Luther RR () Sympatholysis after neuron-specific, N-type, voltage-sensitive calcium channel blockade: first demonstration of N-channel function in humans. J Cardiovasc Pharmacol – PubMed CrossRef Google Scholar.IDENTIFICATION AND CHARACTERIZATION OF VOLTAGE- SENSITIVE CALCIUM CHANNELS IN NEURONAL CLONAL CELL LINES1 STEPHEN B.

FREEDMAN, GLYN DAWSON, MITCHEL L. VILLEREAL, AND RICHARD J. MILLER2 Department of Pharmacological and Physiological Sciences, The University of Chicago, Chicago, Illinois T-type calcium channels are critically important for regulating neuronal excitability, both in the central and peripheral nervous system, and are essential mediators of hormone secretion.

Conversely, T-type channel hyperactivity has been linked to neurological disorders such as absence epilepsy and neuropathic pain. Hence, it is critical to understand the cellular mechanisms that control T.