Piezo proteins, mechano reception and behaviour in Hydra

Area of Science:

• Cell Biology
• Physiology
• Evolutionary Biology

Background:

• Cells detect and respond to mechanical forces to maintain homeostasis.
• Mechano-sensory systems (MS) are vital for organismal responses.
• Piezo proteins are newly identified mechano-gated ion channels crucial for mechanotransduction.

Purpose of the Study:

• Investigate the physiological roles of Piezo mechano-sensory channels in Hydra sp.
• Analyze the effects of Piezo channel activation on Hydra's contractile behavior and cnidocyst discharge.
• Determine if Hydra's Piezo channels are conserved and functionally relevant.

Main Methods:

• Utilized Jedi1, a specific Piezo1 agonist, to activate Piezo channels in Hydra sp.
• Observed and quantified changes in contractile behavior and cnidocyst discharge.
• Administered GdCl3, a mechano-sensitive channel inhibitor, to assess Piezo channel dependency.
• Performed bioinformatic analysis of Hydra's genome for Piezo protein motifs.

Main Results:

• Jedi1 significantly increased contractile behavior, inducing contraction bursts similar to natural stimuli.
• Jedi1 triggered cnidocyst discharge, mimicking responses to prey contact.
• The effects of both Jedi1 and natural stimuli were blocked by GdCl3.
• Bioinformatic analysis confirmed the presence of characteristic Piezo protein motifs in Hydra.

Conclusions:

• Piezo channels play a significant physiological role in Hydra sp., mediating responses to mechanical stimuli.
• Hydra's Piezo channels are functionally conserved and respond to agonists and natural triggers.
• Hydra serves as a valuable model organism for studying Piezo channel biology and pharmacology due to high conservation.