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Metabolic pathways and immunometabolism in rare kidney diseases.

Abstract：

OBJECTIVES:To characterise renal tissue metabolic pathway gene expression in different forms of glomerulonephritis. METHODS:Patients with nephrotic syndrome (NS), antineutrophil cytoplasmic antibody-associated vasculitis (AAV), systemic lupus erythematosus (SLE) and healthy living donors (LD) were studied. Clinically indicated renal biopsies were obtained at time of diagnosis and microdissected into glomerular and tubulointerstitial compartments. Microarray-derived differential gene expression of 88 genes representing critical enzymes of metabolic pathways and 25 genes related to immune cell markers was compared between disease groups. Correlation analyses measured relationships between metabolic pathways, kidney function and cytokine production. RESULTS:Reduced steady state levels of mRNA species were enriched in pathways of oxidative phosphorylation and increased in the pentose phosphate pathway (PPP) with maximal perturbation in AAV and SLE followed by NS, and least in LD. Transcript regulation was isozymes specific with robust regulation in hexokinases, enolases and glucose transporters. Intercorrelation networks were observed between enzymes of the PPP (eg, transketolase) and macrophage markers (eg, CD68) (r=0.49, p<0.01). Increased PPP transcript levels were associated with reduced glomerular filtration rate in the glomerular (r=-0.49, p<0.01) and tubulointerstitial (r=-0.41, p<0.01) compartments. PPP expression and tumour necrosis factor activation were tightly co-expressed (r=0.70, p<0.01). CONCLUSION:This study demonstrated concordant alterations of the renal transcriptome consistent with metabolic reprogramming across different forms of glomerulonephritis. Activation of the PPP was tightly linked with intrarenal macrophage marker expression, reduced kidney function and increased production of cytokines. Modulation of glucose metabolism may offer novel immune-modulatory therapeutic approaches in rare kidney diseases.

journal_name

Ann Rheum Dis

journal_title

Annals of the rheumatic diseases

authors

Grayson PC,Eddy S,Taroni JN,Lightfoot YL,Mariani L,Parikh H,Lindenmeyer MT,Ju W,Greene CS,Godfrey B,Cohen CD,Krischer J,Kretzler M,Merkel PA,Vasculitis Clinical Research Consortium, the European Renal cDNA Bank cohort, and th

doi

10.1136/annrheumdis-2017-212935

subject

Has Abstract

pub_date

2018-08-01 00:00:00

pages

1226-1233

issue

eissn

0003-4967

issn

1468-2060

pii

annrheumdis-2017-212935

journal_volume

pub_type

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Metabolic pathways and immunometabolism in rare kidney diseases.