Voltage-gated calcium channel subunit beta (Cavβ) (Cavβ)

Voltage-gated calcium channels (VGCCs) in cestodes are essential membrane proteins that regulate the influx of calcium ions, which is vital for neuromuscular coordination and the maintenance of the parasite's tegumental integrity. The beta subunit (Cavβ) of these channels has been identified as the specific molecular target for praziquantel, the primary anthelmintic used to treat tapeworm infections such as taeniasis and neurocysticercosis (Park & Marchant, 2012). When praziquantel binds to the Cavβ subunit, it induces a rapid and sustained influx of calcium into the parasite's syncytial tegument and musculature (Kohn et al., 2001). This influx causes immediate tetanic contraction, leading to paralysis and the formation of vacuoles on the parasite's surface, which eventually rupture. The destruction of the tegument exposes the parasite to the host's immune system and digestive enzymes, facilitating its elimination (Greenberg, 2005). Because these channels are fundamental to the parasite's survival, they represent a high-value target for drug development, although the inflammatory response to dying parasites in the host's central nervous system remains a significant clinical challenge (White, 2014).

Other names

Cestode calcium channelTapeworm calcium channelVoltage-dependent calcium channel beta subunitVGCC beta subunitCestode/tapeworm calcium channels

Praziquantel acts as an allosteric modulator of the voltage-gated calcium channel beta subunit, inducing a rapid influx of calcium ions into the parasite's cells, resulting in tetanic contraction and tegumental damage.