Abstract:
:Pyroptosis is a highly inflammatory form of programmed cell death that is caused by infection with intracellular pathogens and activation of canonical or noncanonical inflammasomes. The purinergic receptor P2X7 is activated by the noncanonical inflammasome and contributes essentially to pyroptotic cell death. The Ca2+ activated phospholipid scramblase and ion channel TMEM16F has been shown earlier to control cellular effects downstream of purinergic P2X7 receptors that ultimately lead to cell death. As pyroptotic cell death is accompanied by an increases in intracellular Ca2+, we asked whether TMEM16F is activated during pyroptosis. The N-terminal cleavage product of gasdermin D (GD-N) is an executioner of pyroptosis by forming large plasma membrane pores. Expression of GD-N enhanced basal Ca2+ levels and induced cell death. We observed that GD-N induced cell death in HEK293 and HAP1 cells, which was depending on expression of endogenous TMEM16F. GD-N activated large whole cell currents that were suppressed by knockdown or inhibition of TMEM16F. The results suggest that whole cell currents induced by the pore forming domain of gasdermin-D, are at least in part due to activation of TMEM16F. Knockdown of other TMEM16 paralogues expressed in HAP1 cells suggest TMEM16F as a crucial element during pyroptosis and excluded a role of other TMEM16 proteins. Thus TMEM16F supports pyroptosis and other forms of inflammatory cell death such as ferroptosis. Its potent inhibition by tannic acid may be part of the anti-inflammatory effects of flavonoids.
journal_name
Cell Death Disjournal_title
Cell death & diseaseauthors
Ousingsawat J,Wanitchakool P,Schreiber R,Kunzelmann Kdoi
10.1038/s41419-018-0373-8subject
Has Abstractpub_date
2018-02-20 00:00:00pages
300issue
3issn
2041-4889pii
10.1038/s41419-018-0373-8journal_volume
9pub_type
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