Abstract
Plasma membrane cholesterol is critical for neutrophil chemotaxis, although how cholesterol affects chemotactic signaling pathway has not been clearly delineated. Here we demonstrate that cholesterol was absolutely required for polarized redistribution of key chemotactic mediators in human neutrophils in response to all chemoattractants tested (fMet-Leu-Phe, and the chemokines CXCL1, CXCL8 and CXCL12). In particular, PI3K and phosphatidylinositol-3,4,5 triphosphate (PIP3) failed to accumulate at the front and phosphatase and tensin homolog (PTEN) at the back of chemoattractant-stimulated neutrophils after cholesterol depletion. Cholesterol depletion did not affect early chemoattractant signaling events such as G-protein activation, intracellular calcium flux or G-protein-independent endocytosis-linked signaling, including the activation of mitogen-activated protein kinase (MAPK), Hck and Fgr transduced by β-arrestin. During cell polarization, F-actin assemblies redistributed the cholesterol-rich microdomains and cytoskeleton-anchored proteins, including CD16 and CD44 from the leading edge. These data suggest that spatial polarization of chemotactic mediators is orchestrated by protein:protein interactions that organize cholesterol-rich domains of the plasma membrane.
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Abbreviations
- APC:
-
Allophycocyanin
- DRMs:
-
Detergent-resistant membranes
- EGFR:
-
Epidermal growth factor receptor
- fMLF:
-
N-Formyl-methionine-leucine-phenylalanine
- FPR:
-
N-Formyl peptide receptor
- GPCR:
-
G-protein-coupled receptor
- GPI:
-
Glycosyl phosphatidylinositol
- GRK:
-
G-protein-coupled receptor kinase
- GROα:
-
Growth related oncogene α
- HMG-CoA:
-
Hydroxy-methyl glutaryl CoA
- IL-8:
-
Interleukin-8
- IP3 :
-
Inositol-1,4,5 trisphosphate
- Lat-B:
-
Latrunculin B
- LTB4 :
-
Leukotriene B4
- MAPK:
-
Mitogen-activated protein kinase
- MβCD:
-
Methyl-β-cyclodextrin
- PIP2 :
-
Phosphatidyl inositol 4,5 bisphosphate
- PIP3 :
-
Phosphatidylinositol-3,4,5 triphosphate
- PTEN:
-
Phosphatase and tensin homolog
- PTX:
-
Pertussis toxin
- SDF:
-
Stromal cell-derived factor
- TM:
-
Transmembrane
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Acknowledgements
We thank Philip Murphy and Joshua Farber of LMI, NIAID for advice and comments and Owen Schwartz of the Biological Imaging Section, RTB, NIAID for technical advice. The Intramural Research Program of the National Institute of Allergy and Infectious Diseases, National Institutes of Health supported this research.
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Rose, J.J., Foley, J.F., Yi, L. et al. Cholesterol is obligatory for polarization and chemotaxis but not for endocytosis and associated signaling from chemoattractant receptors in human neutrophils. J Biomed Sci 15, 441–461 (2008). https://doi.org/10.1007/s11373-008-9239-x
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DOI: https://doi.org/10.1007/s11373-008-9239-x