Connexin-based gap junction channel (Cx-GJC)

Connexin-based gap junction channels are specialized intercellular protein complexes composed of hexameric assemblies of connexin proteins, known as connexons. These channels facilitate the direct exchange of ions, small metabolites, and signaling molecules between adjacent cells, a process essential for maintaining tissue homeostasis and coordinating physiological activities such as cardiac contraction and neuronal signaling (Sohl and Willecke, 2004, PMID: 15561900). Dysregulation or mutations in various connexin isoforms are implicated in a wide range of pathologies, including cardiac arrhythmias, hereditary deafness, chronic skin wounds, and neurodegenerative conditions (Leybaert et al., 2017, PMID: 28214313). Pharmacological targeting of these channels involves the use of small molecule blockers, mimetic peptides, and enhancers to restore or inhibit communication depending on the disease context (Evans et al., 2012, PMID: 22439989). However, the high degree of structural similarity among the 21 human connexin isoforms presents a significant challenge for achieving therapeutic selectivity and avoiding off-target effects in non-diseased tissues.

Other names

Gap junctionConnexin channelConnexonIntercellular channelConnexin hemichannel

Modulation of gap junctional intercellular communication (GJIC) through channel blocking, opening, or inhibition of hemichannels.