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Molecular Mechanisms and Therapeutic Potential of Ion Channels in Human Diseases

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Biology".

Deadline for manuscript submissions: 20 November 2024 | Viewed by 3569

Special Issue Editors


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Guest Editor
Department of Chemistry Biology and Biotechnology, University of Perugia, 06100 Perugia, Italy
Interests: ion channels; electrophysiology; patch clamp; molecular dynamics; glioblastoma
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Department of Chemistry Biology and Biotechnology, University of Perugia, 06100 Perugia, Italy
Interests: ion channels; electrophysiology; patch clamp; Ca2+ imaging; glioblastoma; skeletal muscle

Special Issue Information

Dear Colleagues,

Ion channels are transmembrane proteins that are expressed in all living organisms, from unicellular prokaryotes to humans, which play a fundamental role in the rapid signaling of biological membranes. Ion channels have evolved to mediate the rapid passage of ion species, exploiting their electrochemical gradient, to carry out various biological functions, including the genesis and propagation of nerve impulses, muscle contraction, the release of signaling molecules, cell proliferation, differentiation, migration, and death. Therefore, the proper functioning of ion channels is essential for the completion of many biological processes. Abnormalities in ion channel functions are linked to dysfunctional processes in several tissues/organs and represent the basis of many human diseases. Both loss- or gain-of-function mutations in ion channels often lead to human hereditary diseases, including cystic fibrosis, malignant hyperthermia, central core disease, cerebellar ataxia, tubular aggregate myopathy, Stormorken disease, and megalencephalic leukoencephalopathy with subcortical cysts. In addition, the altered expression and function of unmutated ion channels also indirectly contributes to or amplifies the pathogenesis of specific diseases. For instance, ion channels play a key role in the progression and/or malignancy of several types of tumors, where the ion channels are involved in different aspects of the tumor biology, including proliferation, differentiation, migration, and apoptosis. Given the key role played by ion channels, it is not surprising that many pharmacological treatments are based on the modulation of their activity, with several ion channel inhibitors and activators currently being tested in clinical trials.  

For this Special Issue, we invite papers focused on the role played by the ion channels in human diseases, with a particular emphasis on the mechanism by which the altered function/expression of ion channels impacts the disease phenotype. Data on a possible use of ion channel modulators as new therapeutic strategies are also welcome.

Dr. Luigi Catacuzzeno
Dr. Antonio Michelucci
Guest Editors

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Keywords

  • ion channels
  • cancer
  • channelopathies
  • electrophysiology
  • patch clamp

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Published Papers (2 papers)

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Research

18 pages, 3881 KiB  
Article
Osmotically Sensitive TREK Channels in Rat Articular Chondrocytes: Expression and Functional Role
by Arturo Ponce, Alejandro Ogazon del Toro, Lidia Jimenez, Maria Luisa Roldan and Liora Shoshani
Int. J. Mol. Sci. 2024, 25(14), 7848; https://doi.org/10.3390/ijms25147848 - 18 Jul 2024
Viewed by 2608
Abstract
Articular chondrocytes are the primary cells responsible for maintaining the integrity and functionality of articular cartilage, which is essential for smooth joint movement. A key aspect of their role involves mechanosensitive ion channels, which allow chondrocytes to detect and respond to mechanical forces [...] Read more.
Articular chondrocytes are the primary cells responsible for maintaining the integrity and functionality of articular cartilage, which is essential for smooth joint movement. A key aspect of their role involves mechanosensitive ion channels, which allow chondrocytes to detect and respond to mechanical forces encountered during joint activity; nonetheless, the variety of mechanosensitive ion channels involved in this process has not been fully resolved so far. Because some members of the two-pore domain potassium (K2P) channel family have been described as mechanosensors in other cell types, in this study, we investigate whether articular chondrocytes express such channels. RT-PCR analysis reveals the presence of TREK-1 and TREK-2 channels in these cells. Subsequent protein expression assessments, including Western blotting and immunohistochemistry, confirm the presence of TREK-1 in articular cartilage samples. Furthermore, whole-cell patch clamp assays demonstrate that freshly isolated chondrocytes exhibit currents attributable to TREK-1 channels, as evidenced by activation by arachidonic acid (AA) and ml335 and further inhibition by spadin. Additionally, exposure to hypo-osmolar shock activates currents, which can be attributed to the presence of TREK-1 channels, as indicated by their inhibition with spadin. Therefore, these findings highlight the expression of TREK channels in rat articular chondrocytes and suggest their potential involvement in regulating the integrity of cartilage extracellular matrix. Full article
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22 pages, 5903 KiB  
Article
Insights into CLC-0’s Slow-Gating from Intracellular Proton Inhibition
by Hwoi Chan Kwon, Robert H. Fairclough and Tsung-Yu Chen
Int. J. Mol. Sci. 2024, 25(14), 7796; https://doi.org/10.3390/ijms25147796 - 16 Jul 2024
Viewed by 521
Abstract
The opening of the Torpedo CLC-0 chloride (Cl) channel is known to be regulated by two gating mechanisms: fast gating and slow (common) gating. The structural basis underlying the fast-gating mechanism is better understood than that of the slow-gating mechanism, which [...] Read more.
The opening of the Torpedo CLC-0 chloride (Cl) channel is known to be regulated by two gating mechanisms: fast gating and slow (common) gating. The structural basis underlying the fast-gating mechanism is better understood than that of the slow-gating mechanism, which is still largely a mystery. Our previous study on the intracellular proton (H+i)-induced inhibition of the CLC-0 anionic current led to the conclusion that the inhibition results from the slow-gate closure (also called inactivation). The conclusion was made based on substantial evidence such as a large temperature dependence of the H+i inhibition similar to that of the channel inactivation, a resistance to the H+i inhibition in the inactivation-suppressed C212S mutant, and a similar voltage dependence between the current recovery from the H+i inhibition and the recovery from the channel inactivation. In this work, we further examine the mechanism of the H+i inhibition of wild-type CLC-0 and several mutants. We observe that an anion efflux through the pore of CLC-0 accelerates the recovery from the H+i-induced inhibition, a process corresponding to the slow-gate opening. Furthermore, various inactivation-suppressed mutants exhibit different current recovery kinetics, suggesting the existence of multiple inactivated states (namely, slow-gate closed states). We speculate that protonation of the pore of CLC-0 increases the binding affinity of permeant anions in the pore, thereby generating a pore blockage of ion flow as the first step of inactivation. Subsequent complex protein conformational changes further transition the CLC-0 channel to deeper inactivated states. Full article
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