Cytoplasmic Cl- couples membrane remodeling to epithelial morphogenesis.
Mu He1, Wenlei Ye1, Won-Jing Wang2
1Department of Physiology, University of California, San Francisco, CA 94158.
The calcium-activated chloride channel TMEM16A maintains cytoplasmic chloride homeostasis, crucial for cell membrane remodeling during mammalian epithelial development. This chloride regulation impacts phosphoinositide organization and membrane trafficking.
Area of Science:
- Cell Biology
- Molecular Biology
- Developmental Biology
Background:
- Chloride ions (Cl-) are major extracellular and cytoplasmic anions in eukaryotes.
- Cytoplasmic Cl- levels are regulated by channels and transporters, influencing membrane potential and water secretion.
- The role of cytoplasmic Cl- in animal development and tissue homeostasis remains largely unexplored.
Purpose of the Study:
- To investigate the role of TMEM16A, a calcium-activated chloride channel (CaCC), in regulating cytoplasmic Cl- homeostasis.
- To determine if TMEM16A-mediated Cl- regulation influences plasma membrane remodeling during mammalian epithelial morphogenesis.
- To uncover novel functions of cytoplasmic Cl- in animal development.
Main Methods:
- Utilized genetics, cell biology, and pharmacological approaches.
- Investigated TMEM16A's effect on cytoplasmic Cl- levels and PtdIns(4,5)P2 organization.
- Examined the impact of Cl- homeostasis on endocytic trafficking and ciliogenesis.
Main Results:
- TMEM16A regulates cytoplasmic Cl- homeostasis and promotes plasma membrane remodeling essential for epithelial morphogenesis.
- TMEM16A-mediated Cl- control influences PtdIns(4,5)P2 microdomain organization on the plasma membrane.
- Adequate cytoplasmic Cl- levels are necessary for endocytic trafficking and membrane supply during ciliogenesis and adherens junction remodeling.
Conclusions:
- TMEM16A plays a critical role in cytoplasmic Cl- homeostasis, impacting PtdIns(4,5)P2 microdomains and membrane remodeling.
- This study reveals a novel function for CaCC-mediated cytoplasmic Cl- in regulating tissue architecture and organelle biogenesis.
- Cytoplasmic Cl- signaling is crucial for developmental processes, including tissue organization and organelle formation.
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