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The locally activated renin-angiotensin system is involved in albumin permeability in glomerular endothelial cells under high glucose conditions

Title
The locally activated renin-angiotensin system is involved in albumin permeability in glomerular endothelial cells under high glucose conditions
Authors
Paeng J.Park J.Um J.E.Nam B.Y.Kang H.-Y.Kim S.Oh H.J.Park J.T.Han S.H.Ryu D.-R.Yoo T.-H.Kang S.-W.
Ewha Authors
류동열
SCOPUS Author ID
류동열scopus
Issue Date
2017
Journal Title
Nephrology Dialysis Transplantation
ISSN
0931-0509JCR Link
Citation
Nephrology Dialysis Transplantation vol. 32, no. 1, pp. 61 - 72
Keywords
AlbuminuriaDiabetic nephropathyFenestraeGlomerular endothelial cellsRenin-angiotensin system
Publisher
Oxford University Press
Indexed
SCI; SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
Background. Although the diabetic milieu per se, hemodynamic changes, oxidative stress and local growth factors such as angiotensin II (AII) are considered to bemediators in the pathogenesis of diabetic nephropathy, the underlying pathways mediating the changes in glomerular endothelial cells (GECs) are not well understood. Therefore, we investigated changes in the reninangiotensin system (RAS) components in high glucose (HG)- stimulated GECs and the role of the local RAS in morphological and functional changes in GECs under diabetic conditions. Methods. We stimulated GECs with 5.6 mM glucose or 30 mM glucose with or without an angiotensin II type I receptor blocker (ARB) in vitro and also performed experiments with Sprague- Dawley rats injected with diluent (n = 16) or streptozotocin [n = 16, diabetes (DM)]. Eight rats from each group were treated with ARB for 3months in vivo. Real-time polymerase chain reaction, western blot analysis, enzyme-linked immunosorbent assay and immunofluorescent staining using cultured GECs were performed. The permeability of GECs to macromolecules was assessed by measuring the passage of fluorescein isothiocyanatelabeled bovine serum albumin.Morphological changes were also evaluated by scanning and transmission electronmicroscopy. Results. There were significant increases in angiotensinogen expression in HG-stimulated GECs along with significant increases in AI and AII levels. Moreover, the expression of heparan sulfate glycosaminoglycans (HS-GAG) assessed by immunofluorescent staining was significantly lower and the permeability to albumin was significantly higher in GECs exposed to HG medium, and ARB treatment significantly abrogated these changes. Upon electron microscopy examination, the mean size of the GEC fenestrae was significantly greater in HG-stimulated GECs and DM rats, and these increases were significantly ameliorated by ARB. Conclusions. The local RAS within GECs was activated under HG conditions, and this activation may be associated with both an alteration in GEC fenestration and a decrease in HS-GAG, resulting in the development of albuminuria in diabetic nephropathy.
DOI
10.1093/ndt/gfw089
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의과대학 > 의학과 > Journal papers
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