Use the force, fluke: Ligand-independent gating of Schistosoma mansoni ion channel TRPMPZQ. Int J Parasitol 2023 Jul;53(8):427-434
Date
01/08/2023Pubmed ID
36610555Pubmed Central ID
PMC10258140DOI
10.1016/j.ijpara.2022.11.004Scopus ID
2-s2.0-85146298174 (requires institutional sign-in at Scopus site) 2 CitationsAbstract
The parasitic flatworm ion channel, TRPMPZQ, is a non-selective cation channel that mediates Ca2+ entry and membrane depolarization when activated by the anthelmintic drug, praziquantel (PZQ). TRPMPZQ is conserved in all platyhelminth genomes scrutinized to date, with the sensitivity of TRPMPZQ in any particular flatworm correlating with the overall sensitivity of the worm to PZQ. Conservation of this channel suggests it plays a role in flatworm physiology, but the nature of the endogenous cues that activate this channel are currently unknown. Here, we demonstrate that TRPMPZQ is activated in a ligand-independent manner by membrane stretch, with the electrophysiological signature of channel opening events being identical whether evoked by negative pressure, or by PZQ. TRPMPZQ is therefore a multimodal ion channel gated by both physical and chemical cues. The mechanosensitivity of TRPMPZQ is one route for endogenous activation of this ion channel that holds relevance for schistosome physiology given the persistent pressures and mechanical cues experienced throughout the parasite life cycle.
Author List
Chulkov EG, Isaeva E, Stucky CL, Marchant JSAuthors
Evgenii Chulkov Postdoctoral Fellow in the Cell Biology, Neurobiology and Anatomy department at Medical College of WisconsinOlena Isaeva PhD Assistant Professor in the Cell Biology, Neurobiology and Anatomy department at Medical College of Wisconsin
Jonathan S. Marchant PhD Chair, Professor in the Cell Biology, Neurobiology and Anatomy department at Medical College of Wisconsin
Cheryl L. Stucky PhD Professor in the Cell Biology, Neurobiology and Anatomy department at Medical College of Wisconsin
MESH terms used to index this publication - Major topics in bold
Adenosine Diphosphate RiboseAnimals
Helminth Proteins
Humans
Pressure
Schistosoma mansoni
TRPM Cation Channels