Chloride channel (DIDS-sensitive)

DIDS-sensitive chloride channels represent a functionally defined group of anion-conducting membrane proteins characterized by their susceptibility to inhibition by the stilbene derivative 4,4'-diisothiocyanatostilbene-2,2'-disulfonic acid (DIDS). This heterogeneous class includes members of the voltage-gated chloride channel (CLC) family, calcium-activated chloride channels (CaCCs) such as TMEM16A, and volume-regulated anion channels (VRACs). These channels are essential for maintaining cellular homeostasis by regulating cell volume, transepithelial fluid transport, and membrane excitability in excitable tissues like muscle and neurons. They also play a critical role in the acidification of intracellular organelles, such as endosomes and lysosomes, which is necessary for proper protein degradation and endocytic trafficking. Dysregulation of DIDS-sensitive chloride channels is associated with a variety of human diseases, including myotonia congenita (due to CLC-1 mutations), hypertension, and several types of cancer where overexpressed channels like TMEM16A promote tumor cell proliferation and metastasis. Pharmacologically, these channels are primarily targeted by non-specific blockers like DIDS, SITS, and NPPB, which serve as vital research tools for characterizing anion currents. While most current inhibitors lack the selectivity required for systemic clinical use, they provide a foundation for developing targeted therapies for conditions involving abnormal chloride conductance, such as secretory diarrheas and certain cardiovascular disorders.

Other names

Stilbene-sensitive chloride channelsDIDS-inhibitable chloride channelsDIDS-sensitive anion channels

Direct blockade of the anion-conducting pore or inhibition of the channel gating mechanism, preventing the transmembrane flux of chloride and other anions.