TY  - JOUR
AU  - Chan, Chii J.
AU  - Ekpenyong, Andrew E.
AU  - Golfier, S.
AU  - Li, Wenhong
AU  - Chalut, Kevin J.
AU  - Otto, Oliver
AU  - Elgeti, Jens
AU  - Guck, Jochen
AU  - Lautenschlager, Franziska
TI  - Myosin II Activity Softens Cells in Suspension
JO  - Biophysical journal
VL  - 108
IS  - 8
SN  - 0006-3495
CY  - Cambridge, Mass.
PB  - Cell Press
M1  - FZJ-2016-01125
SP  - 1856-1869
PY  - 2015
AB  - The cellular cytoskeleton is crucial for many cellular functions such as cell motility and wound healing, as well as other processes that require shape change or force generation. Actin is one cytoskeleton component that regulates cell mechanics. Important properties driving this regulation include the amount of actin, its level of cross-linking, and its coordination with the activity of specific molecular motors like myosin. While studies investigating the contribution of myosin activity to cell mechanics have been performed on cells attached to a substrate, we investigated mechanical properties of cells in suspension. To do this, we used multiple probes for cell mechanics including a microfluidic optical stretcher, a microfluidic microcirculation mimetic, and real-time deformability cytometry. We found that nonadherent blood cells, cells arrested in mitosis, and naturally adherent cells brought into suspension, stiffen and become more solidlike upon myosin inhibition across multiple timescales (milliseconds to minutes). Our results hold across several pharmacological and genetic perturbations targeting myosin. Our findings suggest that myosin II activity contributes to increased whole-cell compliance and fluidity. This finding is contrary to what has been reported for cells attached to a substrate, which stiffen via active myosin driven prestress. Our results establish the importance of myosin II as an active component in modulating suspended cell mechanics, with a functional role distinctly different from that for substrate-adhered cells.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000353344400005
C6  - pmid:25902426
DO  - DOI:10.1016/j.bpj.2015.03.009
UR  - https://juser.fz-juelich.de/record/281432
ER  -