The direction of membrane lipid flow in locomoting polymorphonuclear leukocytes

Lee, Juliet (author): Department of Cell Biology and Anatomy, University of North Carolina, Chapel Hill, USA

Gustafsson, Mikael (author): Linköpings universitet,Medicinsk mikrobiologi,Hälsouniversitetet

Magnusson, Karl-Eric (author): Linköpings universitet,Medicinsk mikrobiologi,Hälsouniversitetet

Jacobson, Ken (author): Department of Cell Biology and Anatomy, University of North Carolina, Chapel Hill, USA

(creator_code:org_t)

American Association for the Advancement of Science, 1990
1990
English.
In: Science. - : American Association for the Advancement of Science. - 0036-8075 .- 1095-9203. ; 247:4947, s. 1229-1233

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; show less...

Abstract Subject headings

The objective of this study was to determine the direction of membrane lipid flow in locomoting cells. The plasma membrane of human polymorphonuclear leukocytes was stained with a fluorescent lipid analog dihexadecanoyl indocarbocyanine. A line was photobleached on the cell surface perpendicular to the direction of cell motion. Low-light-level fluorescence microscopy and digital image-processing techniques were used to analyze a series of images taken at short intervals after photobleaching. The bleached line remained visible for about 5 seconds before being erased by diffusional recovery. Examination of fluorescence intensity profiles allowed a comparison to be made between the velocities of line and cell movement. Results indicate that the bleached line moves forward with the same velocity as the cell during locomotion, refuting the retrograde lipid flow model of locomotion. Instead, the plasma membrane lipid appears to move forward according to either the unit movement of membrane or the tank track model of locomotion.

By the author/editor: Lee, Juliet; Gustafsson, Mika ...; Magnusson, Karl- ...; Jacobson, Ken

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