Schreiber, Rainer and Ousingsawat, Jiraporn and Wanitchakool, Podchanart and Sirianant, Lalida and Benedetto, Roberta and Reiss, Karina and Kunzelmann, Karl (2018) Regulation of TMEM16A/ANO1 and TMEM16F/ANO6 ion currents and phospholipid scrambling by Ca2+ and plasma membrane lipid. JOURNAL OF PHYSIOLOGY-LONDON, 596 (2). pp. 217-229. ISSN 0022-3751, 1469-7793
Full text not available from this repository. (Request a copy)Abstract
TMEM16/anoctamin (ANO) proteins form Ca2+-activated ion channels or phospholipid scramblases. We found that both TMEM16A/ANO1 and TMEM16F/ANO6 produced Cl- currents when activated by intracellular Ca2+, but only TMEM16F was able to expose phosphatidylserine to the outer leaflet of the plasma membrane. Mutations within TMEM16F or TMEM16A/F chimeras similarly changed Cl- currents and phospholipid scrambling, suggesting the same intramolecular pathway for Cl- and phospholipids. When overexpressed, TMEM16A and TMEM16F produced spontaneous Cl- currents at 37 degrees C even at resting intracellular Ca2+ levels, which was abolished by inhibition of phospholipase A2 (PLA(2)). Connversely, activation of PLA(2) or application of active PLA(2), as well as lipid peroxidation induced by reactive oxygen species (ROS) using staurosporine or tert-butyl hydroperoxide, enhanced ion currents by TMEM16A/F and in addition activated phospholipid scrambling by TMEM16F. Thus, TMEM16 proteins are activated by an increase in intracellular Ca2+, or independent of intracellular Ca2+, by modifications occurring in plasma and intracellular membrane phospholipids. These results may help to explain why regions distant to the TMEM16 pore and the Ca2+ binding sites control Cl- currents and phospholipid scrambling. Regulation of TMEM16 proteins through modification of membrane phospholipids occurs during regulated cell death such as apoptosis and ferroptosis. It contributes to inflammatory and nerve injury-induced hypersensitivity and generation of pain and therefore provides a regulatory mechanism that is particularly relevant during disease.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CL-CHANNEL ANO1; ANOCTAMIN 6; PHOSPHATIDYLSERINE EXPOSURE; CALCIUM; CONDUCTANCE; ACTIVATION; EXPRESSION; REQUIRES; SIGNALS; CELLS; TMEM16A; TMEM16F; Anoctamin 1; Anoctamin 6; phospholipid scrambling; Ca2+ activated Cl- channel |
| Subjects: | 500 Science > 570 Life sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Physiologie > Prof. Dr. Karl Kunzelmann |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 23 Mar 2020 15:00 |
| Last Modified: | 23 Mar 2020 15:00 |
| URI: | https://pred.uni-regensburg.de/id/eprint/15197 |
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