Disruption of membrane cholesterol organization impairs the activity of PIEZO1 channel clusters.
Journal
The Journal of general physiology
ISSN: 1540-7748
Titre abrégé: J Gen Physiol
Pays: United States
ID NLM: 2985110R
Informations de publication
Date de publication:
03 08 2020
03 08 2020
Historique:
received:
18
10
2019
accepted:
12
05
2020
entrez:
26
6
2020
pubmed:
26
6
2020
medline:
3
9
2021
Statut:
ppublish
Résumé
The human mechanosensitive ion channel PIEZO1 is gated by membrane tension and regulates essential biological processes such as vascular development and erythrocyte volume homeostasis. Currently, little is known about PIEZO1 plasma membrane localization and organization. Using a PIEZO1-GFP fusion protein, we investigated whether cholesterol enrichment or depletion by methyl-β-cyclodextrin (MBCD) and disruption of membrane cholesterol organization by dynasore affects PIEZO1-GFP's response to mechanical force. Electrophysiological recordings in the cell-attached configuration revealed that MBCD caused a rightward shift in the PIEZO1-GFP pressure-response curve, increased channel latency in response to mechanical stimuli, and markedly slowed channel inactivation. The same effects were seen in native PIEZO1 in N2A cells. STORM superresolution imaging revealed that, at the nanoscale, PIEZO1-GFP channels in the membrane associate as clusters sensitive to membrane manipulation. Both cluster distribution and diffusion rates were affected by treatment with MBCD (5 mM). Supplementation of polyunsaturated fatty acids appeared to sensitize the PIEZO1-GFP response to applied pressure. Together, our results indicate that PIEZO1 function is directly dependent on the membrane composition and lateral organization of membrane cholesterol domains, which coordinate the activity of clustered PIEZO1 channels.
Identifiants
pubmed: 32582958
pii: 151885
doi: 10.1085/jgp.201912515
pmc: PMC7398139
pii:
doi:
Substances chimiques
Ion Channels
0
PIEZO1 protein, human
0
Cholesterol
97C5T2UQ7J
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Commentaires et corrections
Type : CommentIn
Informations de copyright
© 2020 Ridone et al.
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