Cestode voltage-gated calcium channel (VGCC)

Cestode voltage-gated calcium channels (VGCCs) are essential transmembrane proteins in tapeworms that mediate the entry of calcium ions into cells upon membrane depolarization (Greenberg, R. M., 2014, Frontiers in Genetics). These channels are multi-subunit complexes, typically consisting of a pore-forming alpha-1 subunit and auxiliary subunits like the beta subunit, which are structurally distinct from their mammalian counterparts (Jeziorski, M. C., & Greenberg, R. M., 2006, Molecular and Biochemical Parasitology). In cestodes, VGCCs are vital for physiological processes including muscle contraction, neurotransmission, and the maintenance of the tegumental surface (Kohn, A. B., et al., 2001, Journal of Biological Chemistry). They have long been recognized as a primary pharmacological target for praziquantel, the gold-standard treatment for flatworm infections (Greenberg, R. M., 2005, Parasitology). Praziquantel's interaction with the channel complex, particularly the beta subunit, triggers a rapid and sustained influx of calcium, leading to immediate muscle paralysis and tegumental vacuolization. This disruption exposes the parasite to the host's immune system and leads to its eventual clearance. Understanding the unique structural features of cestode VGCCs is crucial for developing new anthelmintics and addressing potential drug resistance in diseases like neurocysticercosis and hydatid disease.

Other names

Tapeworm voltage-gated calcium channelPlatyhelminth voltage-gated calcium channelCestode Cav channelVoltage-dependent calcium channel

Praziquantel acts as an allosteric modulator of the channel complex, specifically interacting with the beta subunit to induce a rapid influx of calcium ions, leading to muscle contraction and tegumental damage.