Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 40, Pages 36307-36315Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b10426
Keywords
neurons; plasma membrane; molecular rotor; microviscosity; fluorescence lifetime imaging; oxidative stress; excitotoxicity; neuroprotection; H3 peptide
Funding
- Imperial College President's Scholarship
- EPSRC Doctoral Prize Fellowship
- EPSRC [EP/I003983/1]
- Michael J. Fox Parkinson's Research Foundation [11713]
- EPSRC [EP/K030760/1, EP/I003983/1] Funding Source: UKRI
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Molecular mobility in neuronal plasma membranes is a crucial factor in brain function. Microscopic viscosity is an important parameter that determines molecular mobility. This study presents the first direct measurement of the microviscosity of plasma membranes of live neurons. Microviscosity maps were obtained using fluorescence lifetime imaging of environment-sensing dyes termed molecular rotors. Neurons were investigated both in the basal state and following common neurodegenerative stimuli, excitotoxicity, or oxidative stress. Both types of neurotoxic challenges induced microviscosity decrease in cultured neurons, and oxidant-induced membrane fluidification was counteracted by the wide-spectrum neuroprotectant, the H3 peptide. These results provide new insights into molecular mobility in neuronal membranes, paramount for basic brain function, and suggest that preservation of membrane stability may be an important aspect of neuroprotection in brain insults and neurodegenerative disorders.
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