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2015 ; 10
(4
): e0125906
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English Wikipedia
Alkalinity of neutrophil phagocytic vacuoles is modulated by HVCN1 and has
consequences for myeloperoxidase activity
#MMPMID25885273
Levine AP
; Duchen MR
; de Villiers S
; Rich PR
; Segal AW
PLoS One
2015[]; 10
(4
): e0125906
PMID25885273
show ga
The NADPH oxidase of neutrophils, essential for innate immunity, passes electrons
across the phagocytic membrane to form superoxide in the phagocytic vacuole.
Activity of the oxidase requires that charge movements across the vacuolar
membrane are balanced. Using the pH indicator SNARF, we measured changes in pH in
the phagocytic vacuole and cytosol of neutrophils. In human cells, the vacuolar
pH rose to ~9, and the cytosol acidified slightly. By contrast, in Hvcn1 knock
out mouse neutrophils, the vacuolar pH rose above 11, vacuoles swelled, and the
cytosol acidified excessively, demonstrating that ordinarily this channel plays
an important role in charge compensation. Proton extrusion was not diminished in
Hvcn1-/- mouse neutrophils arguing against its role in maintaining pH homeostasis
across the plasma membrane. Conditions in the vacuole are optimal for bacterial
killing by the neutral proteases, cathepsin G and elastase, and not by
myeloperoxidase, activity of which was unphysiologically low at alkaline pH.