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Microbubble-Assisted Ultrasound-Induced Transient Phosphatidylserine Translocation

Abstract : Microbubble-assisted ultrasound (sonopermeabilization) results in reversible permeabilization of the plasma membrane of cells. This method is increasingly used in vivo because of its potential to deliver therapeutic molecules with limited cell damage. Nevertheless, the effects of sonopermeabilization on the plasma membrane remain not fully understood. We investigated the influence of sonopermeabilization on the transverse mobility of phospholipids, especially on phosphatidylserine (PS) externalization. We performed studies using optical imaging with Annexin V and FM1-43 probes to monitor PS externalization of rat glioma C6 cells. Sonopermeabilization induced transient membrane permeabilization, which is positively correlated with reversible PS externalization. This membrane disorganization was temporary and not associated with loss of cell viability. Sonopermeabilization did not induce PS externalization via activation of the scramblase. We hypothesize that acoustically induced membrane pores may provide a new pathway for PS migration between both membrane leaflets. During the membrane-resealing phase, PS asymmetry may be re-established by amino-phospholipid flippase activity and/or endocytosis, along with exocytosis processes.
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https://www.hal.inserm.fr/inserm-02438167
Contributor : Jean-Michel Escoffre <>
Submitted on : Tuesday, January 14, 2020 - 10:15:01 AM
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Jean-Michel Escoffre, Marc Derieppe, Bart Lammertink, Clemens Bos, Chrit Moonen. Microbubble-Assisted Ultrasound-Induced Transient Phosphatidylserine Translocation. Ultrasound in Medicine & Biology, 2017, 43 (4), pp.838-851. ⟨10.1016/j.ultrasmedbio.2016.12.002⟩. ⟨inserm-02438167⟩

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