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By using a fluorescent dye loading assay, whole cell patch clamp recordings and real-time measurement of ATP release via GRAB\n                    <jats:sub>ATP<\/jats:sub>\n                    , we have demonstrated that Cx43 hemichannels open in a highly CO\n                    <jats:sub>2<\/jats:sub>\n                    -sensitive manner over the range 20\u201370 mmHg. Mutational analysis confirms that the equivalent residues to those in Cx26, known to be involved in mediating the effects of CO\n                    <jats:sub>2<\/jats:sub>\n                    on gating of hemichannels and gap junction channels, also mediate Cx43 hemichannel gating. These data predict that Cx43 will be partially open at resting physiological levels of PCO\n                    <jats:sub>2<\/jats:sub>\n                    . In acute mouse hippocampal slices, we have demonstrated a CO\n                    <jats:sub>2<\/jats:sub>\n                    -dependent enhancement of synaptic transmission that was blocked by the Cx43-selective mimetic peptide Gap26. Our data resolves an inconsistency in the literature between in vivo studies suggesting that Cx43 hemichannels are at least partially open at rest and in vitro studies performed in the absence of HCO\n                    <jats:sub>3<\/jats:sub>\n                    <jats:sup>-<\/jats:sup>\n                    \/CO\n                    <jats:sub>2<\/jats:sub>\n                    buffering that show Cx43 hemichannels are shut.\n                  <\/jats:p>","DOI":"10.7554\/elife.105989","type":"journal-article","created":{"date-parts":[[2025,4,23]],"date-time":"2025-04-23T10:30:21Z","timestamp":1745404221000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.105989","source":"Crossref","is-referenced-by-count":5,"title":["CO2-dependent opening of connexin 43 hemichannels"],"prefix":"10.7554","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5988-8409","authenticated-orcid":true,"given":"Valentin 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