Voltage-gated calcium channel (Platyhelminthes) (VGCC)

The voltage-gated calcium channel (VGCC) and its associated calcium ion homeostasis machinery in cestodes and other platyhelminths are vital for maintaining the parasite's neuromuscular coordination and tegumental stability (Jeziorski & Greenberg, 2006). These channels, particularly the unique beta-subunits found in flatworms, regulate the intracellular concentration of calcium ions required for muscle contraction and the physiological maintenance of the syncytial tegument (Kohn et al., 2001). This machinery is the primary target of the anthelmintic drug praziquantel, which acts by inducing a rapid and sustained influx of calcium into the parasite's tissues (Greenberg, 2005). The resulting calcium overload causes immediate spastic paralysis and severe morphological damage to the tegument, such as vacuolization and blebbing. These structural changes expose parasite-specific antigens to the host's immune system, facilitating the clearance of the infection. While recent studies suggest that praziquantel may directly activate specific transient receptor potential (TRP) channels which then influence calcium levels, the VGCC complex remains a central component of the parasite's calcium homeostasis and a critical focus for anthelmintic therapy (Park et al., 2019).

Other names

Cestode tegumental calcium channelPraziquantel receptorCalcium ion homeostasis machineryPlatyhelminth voltage-gated calcium channelCav subunit complex

Induction of rapid and sustained calcium influx through the channel complex, leading to spastic paralysis and tegumental disruption.