Schistosoma voltage-gated calcium channel (SmCav) (SmCav)

Schistosoma voltage-gated calcium channels (SmCav) are essential transmembrane proteins in Schistosoma species that mediate the influx of calcium ions into cells upon membrane depolarization. These channels are vital for the parasite's neuromuscular coordination, muscle contraction, and the maintenance of the tegument, which is the worm's primary interface with the host environment (Greenberg, 2005). Historically, these channels have been recognized as the principal target of praziquantel, the primary anthelmintic used to treat schistosomiasis. The drug's interaction with the channel's beta subunit is believed to cause a massive, rapid influx of calcium, resulting in immediate spastic paralysis and tegumental vacuolization (Kohn et al., 2001). This damage allows the host's immune system to recognize and eliminate the parasite. Although recent studies have identified a specific transient receptor potential (TRP) channel as a high-affinity target for praziquantel, the voltage-gated calcium channels remain a critical component of the parasite's physiological response to the drug and a key area of study for understanding schistosome biology (Park et al., 2019).

Other names

Schistosome voltage-dependent calcium channelSmCav1SmCav2Schistosoma calcium channel beta subunitSmCavbetaVoltage-gated calcium channel

Praziquantel acts as an allosteric modulator of the channel, specifically binding to the beta subunit (SmCavbeta) to induce a rapid and sustained influx of calcium ions, leading to parasite paralysis (Kohn et al., 2001; Pica-Mattoccia et al., 2007).