Project Title
Carbon monoxide inhibits Cx46 HCs through a lipid peroxidation-dependent process which increases Cx46- Ca2+ sensitivity
Partner Organisations
Internal ID
1160227
Principal Investigator
Type
basic research
Status
TERMINADO
Start Date
March 16, 2016
End Date
March 20, 2016
18 results
Filters
Settings
Now showing 1 - 10 of 18
- Some of the metrics are blocked by yourconsent settings
Item type:Publication, Charged Residues at the First Transmembrane Region Contribute to the Voltage Dependence of the Slow Gate of Connexins(2016) ;Bernardo I. Pinto ;Isaac E. GarcĂa ;Amaury Pupo; AgustĂn D. MartĂnez2Scopus© Citations 13 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The role of astrocytes in depression, its prevention, and treatment by targeting astroglial gliotransmitter release(2024) ;Yorley Duarte ;Daisy Quintana-Donoso ;Rodrigo Moraga-Amaro ;Ivanka DinamarcaYordan Lemunao<jats:p>The role of ventral hippocampus (vHipp) astroglial gliotransmission in depression was studied using chronic restraint stress (CRS) and chronic unpredictable mild stress (CUMS) rodent models. CRS increased Cx43 hemichannel activity and extracellular glutamate levels in the vHipp and blocking astroglial Cx43 hemichannel-dependent gliotransmission during CRS prevented the development of depression and glutamate buildup. Moreover, the acute blockade of Cx43 hemichannels induced antidepressant effects in rats previously subjected to CRS or CUMS. This antidepressant effect was prevented by coinjection of glutamate and D-serine. Furthermore, Cx43 hemichannel blockade decreased postsynaptic NMDAR currents in vHipp slices in a glutamate and D-serine-dependent manner. Notably, chronic microinfusion of glutamate and D-serine, L-serine, or the NMDAR agonist NMDA, into the vHipp induced depressive-like symptoms in nonstressed rats. We also identified a small molecule, cacotheline, which blocks Cx43 hemichannels and its systemic administration induced rapid antidepressant effects, preventing stress-induced increases in astroglial Cx43 hemichannel activity and extracellular glutamate in the vHipp, without sedative or locomotor side effects. In conclusion, chronic stress increases Cx43 hemichannel-dependent release of glutamate and D-/L-serine from astrocytes in the vHipp, overactivating postsynaptic NMDARs and triggering depressive-like symptoms. This study highlights the critical role of astroglial gliotransmitter release in chronic stress-induced depression and suggests it can be used as a target for the prevention and treatment of depression.</jats:p>Scopus© Citations 5 8 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Connexin and Pannexin-Based Channels in Oligodendrocytes: Implications in Brain Health and Disease(2019) ;Sebastián Vejar ;Juan E. Oyarzún; ;Fernando C. OrtizJuan A. Orellana7Scopus© Citations 28 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Role and Posttranslational Regulation of Cx46 Hemichannels and Gap Junction Channels in the Eye Lens(2022); Guillermo A. Altenberg<jats:p>Connexins are a family of proteins that can form two distinct types of channels: hemichannels and gap junction channels. Hemichannels are composed of six connexin subunits and when open allow for exchanges between the cytoplasm and the extracellular milieu. Gap junction channels are formed by head-to-head docking of two hemichannels in series, each one from one of two adjacent cells. These channels allow for exchanges between the cytoplasms of contacting cells. The lens is a transparent structure located in the eye that focuses light on the retina. The transparency of the lens depends on its lack of blood irrigation and the absence of organelles in its cells. To survive such complex metabolic scenario, lens cells express Cx43, Cx46 and Cx50, three connexins isoforms that form hemichannels and gap junction channels that allow for metabolic cooperation between lens cells. This review focuses on the roles of Cx46 hemichannels and gap junction channels in the lens under physiological conditions and in the formation of cataracts, with emphasis on the modulation by posttranslational modifications.</jats:p>6Scopus© Citations 8 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Extracellular Cysteines Are Critical to Form Functional Cx46 Hemichannels(2022) ;Ainoa Fernández-Olivares ;Eduardo Durán-Jara ;Daniel A. Verdugo ;Mariana C. FioriGuillermo A. Altenberg<jats:p>Connexin (Cxs) hemichannels participate in several physiological and pathological processes, but the molecular mechanisms that control their gating remain elusive. We aimed at determining the role of extracellular cysteines (Cys) in the gating and function of Cx46 hemichannels. We studied Cx46 and mutated all of its extracellular Cys to alanine (Ala) (one at a time) and studied the effects of the Cys mutations on Cx46 expression, localization, and hemichannel activity. Wild-type Cx46 and Cys mutants were expressed at comparable levels, with similar cellular localization. However, functional experiments showed that hemichannels formed by the Cys mutants did not open either in response to membrane depolarization or removal of extracellular divalent cations. Molecular-dynamics simulations showed that Cys mutants may show a possible alteration in the electrostatic potential of the hemichannel pore and an altered disposition of important residues that could contribute to the selectivity and voltage dependency in the hemichannels. Replacement of extracellular Cys resulted in “permanently closed hemichannels”, which is congruent with the inhibition of the Cx46 hemichannel by lipid peroxides, through the oxidation of extracellular Cys. These results point to the modification of extracellular Cys as potential targets for the treatment of Cx46-hemichannel associated pathologies, such as cataracts and cancer, and may shed light into the gating mechanisms of other Cx hemichannels.</jats:p>Scopus© Citations 6 2 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Over-activated hemichannels: A possible therapeutic target for human diseases(2021) ;Mauricio A. Retamal ;Ainoa Fernandez-OlivaresJimmy StehbergScopus© Citations 11 13 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Contribution of connexin hemichannels to the decreases in cell viability induced by linoleic acid in the human lens epithelial cells (HLE-B3)(2020) ;Vania A. Figueroa ;Oscar Jara ;Carolina A. Oliva; 8Scopus© Citations 15 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Activation of Intra-nodose Ganglion P2X7 Receptors Elicit Increases in Neuronal Activity(2023) ;Julio Alcayaga ;Jorge Vera ;Mauricio Reyna-Jeldes ;Alejandra A. CovarrubiasClaudio CoddouScopus© Citations 2 2 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, 1Scopus© Citations 9 1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Redox-mediated regulation of connexin proteins; focus on nitric oxide(2018) ;Isaac E. GarcĂa ;Helmuth A. Sánchez ;AgustĂn D. MartĂnezScopus© Citations 24 2