TY - JOUR
T1 - A novel mechanism of generating extracellular vesicles during apoptosis via a beads-on-a-string membrane structure
AU - Atkin-Smith, Georgia K.
AU - Tixeira, Rochelle
AU - Paone, Stephanie
AU - Mathivanan, Suresh
AU - Collins, Christine
AU - Liem, Michael
AU - Goodall, Katharine J.
AU - Ravichandran, Kodi S.
AU - Hulett, Mark D.
AU - Poon, Ivan K.H.
N1 - Publisher Copyright:
© 2015 Macmillan Publishers Limited. All rights reserved.
PY - 2015/6/15
Y1 - 2015/6/15
N2 - Disassembly of apoptotic cells into smaller fragments (a form of extracellular vesicle called apoptotic bodies) can facilitate removal of apoptotic debris and intercellular communication. However, the mechanism underpinning this process is unclear. While observing monocytes undergoing apoptosis by time-lapse microscopy, we discovered a new type of membrane protrusion that resembles a â €' beads-on-a-stringâ €™ structure. Strikingly, the â €' beadsâ €™ are frequently sheared off the â €' stringâ €™ to form apoptotic bodies. Generation of apoptotic bodies via this mechanism can facilitate a sorting process and results in the exclusion of nuclear contents from apoptotic bodies. Mechanistically, generation of â €' beads-on-a-stringâ €™ protrusion is controlled by the level of actomyosin contraction and apoptopodia formation. Furthermore, in an unbiased drug screen, we identified the ability of sertraline (an antidepressant) to block the formation of â €' beads-on-a-stringâ €™ protrusions and apoptotic bodies. These data uncover a new mechanism of apoptotic body formation in monocytes and also compounds that can modulate this process.
AB - Disassembly of apoptotic cells into smaller fragments (a form of extracellular vesicle called apoptotic bodies) can facilitate removal of apoptotic debris and intercellular communication. However, the mechanism underpinning this process is unclear. While observing monocytes undergoing apoptosis by time-lapse microscopy, we discovered a new type of membrane protrusion that resembles a â €' beads-on-a-stringâ €™ structure. Strikingly, the â €' beadsâ €™ are frequently sheared off the â €' stringâ €™ to form apoptotic bodies. Generation of apoptotic bodies via this mechanism can facilitate a sorting process and results in the exclusion of nuclear contents from apoptotic bodies. Mechanistically, generation of â €' beads-on-a-stringâ €™ protrusion is controlled by the level of actomyosin contraction and apoptopodia formation. Furthermore, in an unbiased drug screen, we identified the ability of sertraline (an antidepressant) to block the formation of â €' beads-on-a-stringâ €™ protrusions and apoptotic bodies. These data uncover a new mechanism of apoptotic body formation in monocytes and also compounds that can modulate this process.
UR - http://www.scopus.com/inward/record.url?scp=84935896741&partnerID=8YFLogxK
U2 - 10.1038/ncomms8439
DO - 10.1038/ncomms8439
M3 - Article
C2 - 26074490
AN - SCOPUS:84935896741
SN - 2041-1723
VL - 6
JO - Nature communications
JF - Nature communications
M1 - 7439
ER -