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Impaired neutrophil activity and increased susceptibility to bacterial infection in mice lacking glucose-6-phosphatase--β.

Authors :
Yuk Yin Cheung
So Youn Kim
Wai Han Yiu
Chi-Jiunn Pan
Hyun-Sik Jun
Ruef, Robert A.
Lee, Eric J.
Westphal, Heiner
Mansfield, Brian C.
Chou, Janice Y.
Source :
Journal of Clinical Investigation. Mar2007, Vol. 117 Issue 3, p784-793. 10p. 1 Black and White Photograph, 1 Chart, 7 Graphs.
Publication Year :
2007

Abstract

Neutropenia and neutrophil dysfunction are common in many diseases, although their etiology is often unclear. Previous views held that there was a single ER enzyme, glucose-6-phosphatase-α (G6Pase-α), whose activity — limited to the liver, kidney, and intestine — was solely responsible for the final stages of gluconeogenesis and glycogenolysis, in which glucose-6-phosphate (G6P) is hydrolyzed to glucose for release to the blood. Recently, we characterized a second G6Pase activity, that of G6Pase-β (also known as G6PC), which is also capable of hydrolyzing G6P to glucose but is ubiquitously expressed and not implicated in interprandial blood glucose homeostasis. We now report that the absence of G6Pase-β led to neutropenia; defects in neutrophil respiratory burst, chemotaxis, and calcium flux; and increased susceptibility to bacterial infection. Consistent with this, G6Pase-β-deficient (G6pc3-/-) mice with experimental peritonitis exhibited increased expression of the glucose-regulated proteins upregulated during ER stress in their neutrophils and bone marrow, and the G6pc3-/- neutrophils exhibited an enhanced rate of apoptosis. Our results define a molecular pathway to neutropenia and neutrophil dysfunction of previously unknown etiology, providing a potential model for the treatment of these conditions. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00219738
Volume :
117
Issue :
3
Database :
Academic Search Index
Journal :
Journal of Clinical Investigation
Publication Type :
Academic Journal
Accession number :
25218800
Full Text :
https://doi.org/10.1172/JCI30443