Assessment of urinary microparticles in normotensive patients with type 1 diabetes.

Abstract:

AIMS/HYPOTHESIS:Assessment of urinary extracellular vesicles including exosomes and microparticles (MPs) is an emerging approach for non-invasive detection of renal injury. We have previously reported that podocyte-derived MPs are increased in diabetic mice in advance of albuminuria. Here, we hypothesised that type 1 diabetes and acute hyperglycaemia would increase urinary podocyte MP levels in uncomplicated diabetes. METHODS:In this post hoc exploratory analysis, we examined archived urine samples from normoalbuminuric patients with uncomplicated type 1 diabetes studied under clamped euglycaemia and hyperglycaemia and compared with healthy controls. Urinary vesicles were assessed by electron microscopy and nanoparticle tracking while podocyte MPs were assessed by flow cytometry. RESULTS:Neither vesicle size nor total number were significantly altered in type 1 diabetes or acute hyperglycaemia. By contrast, urinary podocyte MP levels were higher in type 1 diabetes (0.47 [0.00-3.42] MPs/μmol creatinine [Cr]) compared with healthy controls (0.00 [0.00-0.00] MPs/μmol Cr, p < 0.05) and increased under hyperglycaemic clamp (0.36 [0.00-4.15] MPs/μmol Cr during euglycaemia vs 2.70 [0.00-15.91] MPs/μmol Cr during hyperglycaemia, p < 0.05). Levels of urinary albumin to creatinine ratio and nephrin (surrogates of podocyte injury) were unchanged by type 1 diabetes or acute hyperglycaemia. CONCLUSION/INTERPRETATION:Taken together, our data show that urinary podocyte MP levels are higher in patients with type 1 diabetes in advance of changes in other biomarkers (albuminuria, nephrin). Examination of podocyte MPs may serve as an early biomarker of glomerular injury in uncomplicated type 1 diabetes.

journal_name

Diabetologia

journal_title

Diabetologia

authors

Lytvyn Y,Xiao F,Kennedy CR,Perkins BA,Reich HN,Scholey JW,Cherney DZ,Burger D

doi

10.1007/s00125-016-4190-2

subject

Has Abstract

pub_date

2017-03-01 00:00:00

pages

581-584

issue

3

eissn

0012-186X

issn

1432-0428

pii

10.1007/s00125-016-4190-2

journal_volume

60

pub_type

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