You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither SPIE nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the SPIE website.
7 March 2019Controlled membrane depolarization through photothermal effects of tethered gold nanoparticles
Nanoparticle (NP) bioconjugates have an important role in the development of photothermal (PT) therapy, a promising noninvasive approach wherein the NP acts as a light harvesting antenna to convert light into thermal energy to control cellular function. NP-mediated PT control of cellular membrane potential has gained significant interest in recent years as membrane potential regulates proliferation, migration, action potentials (in neurons), and contraction (in muscle cells). Recently gold nanoparticles (AuNPs) and Au nanorods have been demonstrated to induce action potentials via light-induced thermal activation of membrane tethered NPs. Spherical AuNPs have an efficient plasmonic output and are easily modified to interface with the cell surface. We demonstrate here that 20 nm diameter spherical AuNPs (tethered to the plasma membrane by a cholesterol moiety) transduce incident 532 nm light into proximal membrane heating that induces depolarization of membrane potential. Using these NP bioconjugates, we show the ability to controllably induce action potentials in dorsal root ganglion neurons and to control the membrane potential of rat pheochromocytoma cells. The ability to use light-actuated NP conjugates to control cellular behavior is an emerging research field with implications for neuronal and muscle cell modulation as well as in cancer therapeutics.
The alert did not successfully save. Please try again later.
Megan E. Muroski, Okhil Nag, Eunkeu Oh, Alan L. Huston, James B. Delehanty, "Controlled membrane depolarization through photothermal effects of tethered gold nanoparticles," Proc. SPIE 10892, Colloidal Nanoparticles for Biomedical Applications XIV, 108920M (7 March 2019); https://doi.org/10.1117/12.2508662