Upregulation of soluble epoxide hydrolase in proximal tubular cells mediated proteinuria-induced renal damage

Qian Wang, Wei Pang, Zhuan Cui, Junbao Shi, Yan Liu, Bo Liu, Yunfeng Zhou, Youfei Guan, Bruce D. Hammock, Yue Wang, Yi Zhu

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Epoxyeicosatrienoic acids, hydrolyzed by soluble epoxide hydrolase (sEH), have multiple biological functions, including the regulation of vascular tone, renal tubular transport, and being anti-inflammatory. Inhibitors of sEH have been demonstrated to be antihypertensive and renal protective. To elucidate the role of sEH in glomerulonephritis, we first determined the expression of sEH in human kidney by examining biopsies from 153 patients with a variety of glomerulonephritis, including minimal-change, membranous, and IgA nephropathy. Immunohistochemical staining of frozen kidney biopsy samples revealed sEH preferentially expressed in the renal proximal tubular cells, and its expression increased in all patients with glomerulonephritis. The level of sEH in the cortex was positively correlated with proteinuria and negatively with serum albumin level. To investigate the role of sEH in proteinuria-induced renal damage, we incubated purified urine protein from patients with rat renal proximal tubular epithelial cells in vitro. The level of sEH was elevated, as were monocyte chemoattractant protein 1 and the process of tubular epithelial-to-mesenchymal transition, characterized with increased α-smooth muscle actin (α-SMA) and decreased Ecadherin. These effects were attenuated by administration of a potent sEH inhibitor and mimicked with adenovirus-mediated sEH overexpression. In adriamycin-induced nephropathic mice, sEH inhibitor did not ameliorate proteinuria or level of serum albumin but reduced the long-term elevated serum creatinine level, interstitial inflammation, fibrosis, and α-SMA expression. Thus upregulation of sEH in proximal tubular cells in chronic proteinuric kidney diseases may mediate proteinuria-induced renal damage; sEH inhibition by increasing renal eicosanoid levels could prevent the progression of chronic proteinuric kidney diseases.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Renal Physiology
Volume304
Issue number2
DOIs
StatePublished - Jan 15 2013

Fingerprint

Epoxide Hydrolases
Proteinuria
Up-Regulation
Kidney
Glomerulonephritis
Chronic Renal Insufficiency
Serum Albumin
Lipoid Nephrosis
Biopsy
Membranous Glomerulonephritis
Epithelial-Mesenchymal Transition
Eicosanoids
Chemokine CCL2
Adenoviridae
Doxorubicin
Immunoglobulin A
Antihypertensive Agents
Smooth Muscle
Blood Vessels
Actins

Keywords

  • Epithelial-mesenchymal transition
  • Glomerulonephritis
  • Inflammation
  • Proteinuria
  • Soluble epoxide hydrolase

ASJC Scopus subject areas

  • Physiology
  • Urology

Cite this

Upregulation of soluble epoxide hydrolase in proximal tubular cells mediated proteinuria-induced renal damage. / Wang, Qian; Pang, Wei; Cui, Zhuan; Shi, Junbao; Liu, Yan; Liu, Bo; Zhou, Yunfeng; Guan, Youfei; Hammock, Bruce D.; Wang, Yue; Zhu, Yi.

In: American Journal of Physiology - Renal Physiology, Vol. 304, No. 2, 15.01.2013.

Research output: Contribution to journalArticle

Wang, Qian ; Pang, Wei ; Cui, Zhuan ; Shi, Junbao ; Liu, Yan ; Liu, Bo ; Zhou, Yunfeng ; Guan, Youfei ; Hammock, Bruce D. ; Wang, Yue ; Zhu, Yi. / Upregulation of soluble epoxide hydrolase in proximal tubular cells mediated proteinuria-induced renal damage. In: American Journal of Physiology - Renal Physiology. 2013 ; Vol. 304, No. 2.
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AU - Pang, Wei

AU - Cui, Zhuan

AU - Shi, Junbao

AU - Liu, Yan

AU - Liu, Bo

AU - Zhou, Yunfeng

AU - Guan, Youfei

AU - Hammock, Bruce D.

AU - Wang, Yue

AU - Zhu, Yi

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AB - Epoxyeicosatrienoic acids, hydrolyzed by soluble epoxide hydrolase (sEH), have multiple biological functions, including the regulation of vascular tone, renal tubular transport, and being anti-inflammatory. Inhibitors of sEH have been demonstrated to be antihypertensive and renal protective. To elucidate the role of sEH in glomerulonephritis, we first determined the expression of sEH in human kidney by examining biopsies from 153 patients with a variety of glomerulonephritis, including minimal-change, membranous, and IgA nephropathy. Immunohistochemical staining of frozen kidney biopsy samples revealed sEH preferentially expressed in the renal proximal tubular cells, and its expression increased in all patients with glomerulonephritis. The level of sEH in the cortex was positively correlated with proteinuria and negatively with serum albumin level. To investigate the role of sEH in proteinuria-induced renal damage, we incubated purified urine protein from patients with rat renal proximal tubular epithelial cells in vitro. The level of sEH was elevated, as were monocyte chemoattractant protein 1 and the process of tubular epithelial-to-mesenchymal transition, characterized with increased α-smooth muscle actin (α-SMA) and decreased Ecadherin. These effects were attenuated by administration of a potent sEH inhibitor and mimicked with adenovirus-mediated sEH overexpression. In adriamycin-induced nephropathic mice, sEH inhibitor did not ameliorate proteinuria or level of serum albumin but reduced the long-term elevated serum creatinine level, interstitial inflammation, fibrosis, and α-SMA expression. Thus upregulation of sEH in proximal tubular cells in chronic proteinuric kidney diseases may mediate proteinuria-induced renal damage; sEH inhibition by increasing renal eicosanoid levels could prevent the progression of chronic proteinuric kidney diseases.

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KW - Proteinuria

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