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PLoS One. 2014 Jan 23;9(1):e86426. doi: 10.1371/journal.pone.0086426. eCollection 2014.

Increased metabolite levels of glycolysis and pentose phosphate pathway in rabbit atherosclerotic arteries and hypoxic macrophage.

Author information

1
Department of Pathology, University of Miyazaki, Miyazaki, Japan.
2
Department of Tracer Kinetics & Bioanalysis, Hokkaido University, Sapporo, Japan.
3
Department of Pathology, University of Miyazaki, Miyazaki, Japan ; Department of Internal Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan.
4
Frontier Science Research Center, University of Miyazaki, Miyazaki, Japan.
5
Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Ishikawa, Japan ; Biomedical Imaging Research Center, University of Fukui, Fukui, Japan.
6
Department of Nuclear Medicine, Graduate School of Medicine, Hokkaido University, Sapporo, Japan.
7
Central Institute of Isotope Science, Hokkaido University, Sapporo, Japan.

Abstract

AIMS:

Inflammation and possibly hypoxia largely affect glucose utilization in atherosclerotic arteries, which could alter many metabolic systems. However, metabolic changes in atherosclerotic plaques remain unknown. The present study aims to identify changes in metabolic systems relative to glucose uptake and hypoxia in rabbit atherosclerotic arteries and cultured macrophages.

METHODS:

Macrophage-rich or smooth muscle cell (SMC)-rich neointima was created by balloon injury in the iliac-femoral arteries of rabbits fed with a 0.5% cholesterol diet or a conventional diet. THP-1 macrophages stimulated with lipopolysaccharides (LPS) and interferon-γ (INFγ) were cultured under normoxic and hypoxic conditions. We evaluated comprehensive arterial and macrophage metabolism by performing metabolomic analyses using capillary electrophoresis-time of flight mass spectrometry. We evaluated glucose uptake and its relationship to vascular hypoxia using (18)F-fluorodeoxyglucose ((18)F-FDG) and pimonidazole, a marker of hypoxia.

RESULTS:

The levels of many metabolites increased in the iliac-femoral arteries with macrophage-rich neointima, compared with those that were not injured and those with SMC-rich neointima (glycolysis, 4 of 9; pentose phosphate pathway, 4 of 6; tricarboxylic acid cycle, 4 of 6; nucleotides, 10 of 20). The uptake of (18)F-FDG in arterial walls measured by autoradiography positively correlated with macrophage- and pimonidazole-immunopositive areas (r = 0.76, and r = 0.59 respectively; n = 69 for both; p<0.0001). Pimonidazole immunoreactivity was closely localized with the nuclear translocation of hypoxia inducible factor-1α and hexokinase II expression in macrophage-rich neointima. The levels of glycolytic (8 of 8) and pentose phosphate pathway (4 of 6) metabolites increased in LPS and INFγ stimulated macrophages under hypoxic but not normoxic condition. Plasminogen activator inhibitor-1 protein levels in the supernatant were closely associated with metabolic pathways in the macrophages.

CONCLUSION:

Infiltrative macrophages in atherosclerotic arteries might affect metabolic systems, and hypoxia but not classical activation might augment glycolytic and pentose phosphate pathways in macrophages.

PMID:
24466087
PMCID:
PMC3900532
DOI:
10.1371/journal.pone.0086426
[Indexed for MEDLINE]
Free PMC Article
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