Imaging Exocytosis and Endocytosis at Synapses Using Electron Microscopy

Session Date: 
Dec 8, 2017
Session Order: 

To understand the rapid membrane dynamics or cells or synapses requires observations at high spatial and temporal resolution. “Flash-and-freeze” electron microscopy combines optogenetics with electron microscopy to capture millisecond changes in synaptic morphology during neurotransmission. These experiments indicate that membrane is internalized as quickly as 30 ms after exocytosis. Because of its rapid speed, we call this process “ultrafast endocytosis.” The internalized membrane then fuses to form a synaptic endosome which is resolved into synaptic vesicles with a t-1/2 of 5 seconds.  I will discuss improvements to the instrumentation that will facilitate resolution of membrane fusion, which particularly difficult since exocytosis occurs within 500 microsceonds of stimulation. 

File 2017_12_08_06_Jorgensen-Web.mp496.91 MB
Venue Space: 
Salk Institute - Conrad T. Prebys Auditorium