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2017 ; 7
(1
): 9790
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Topographical interrogation of the living cell surface reveals its role in rapid
cell shape changes during phagocytosis and spreading
#MMPMID28851970
Jumaa MAA
; Dewitt S
; Hallett MB
Sci Rep
2017[Aug]; 7
(1
): 9790
PMID28851970
show ga
Dramatic and rapid changes in cell shape are perhaps best exemplified by
phagocytes, such as neutrophils. These cells complete the processes of spreading
onto surfaces, and phagocytosis within 100?s of stimulation. Although these cell
shape changes are accompanied by an apparent large increase in cell surface area,
the nature of the membrane "reservoir" for the additional area is unclear. One
proposal is that the wrinkled cell surface topography (which forms micro-ridges
on the neutrophil surface) provides the resource for neutrophils to expand their
available surface area. However, it has been problematic to test this proposal in
living cells because these surface structures are sub-light microscopic. In this
paper, we report the development of a novel approach, a variant of FRAP
(fluorescent recovery after photo-bleaching) modified to interrogate the
diffusion path-lengths of membrane associated molecules. This approach provides
clear evidence that the cell surface topography changes dramatically during
neutrophil shape change (both locally and globally) and can be triggered by
elevating cytosolic Ca(2+).