Graded effects of proteinuria on HDL structure in nephrotic rats

Gregory C. Shearer, John W. Newman, Bruce D. Hammock, George Kaysen

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Nephrotic syndrome is characterized by increased triglycerides resulting from decreased clearance of VLDL and chylomicrons. These triglyceride-rich lipoproteins are structurally altered by interaction with HDL derived from animals with proteinuria and not as a consequence of hypoalbuminemia. HDL isolated from rats with massive proteinuria is depleted in apolipoprotein E (apoE). It is unknown at what threshold of urinary albumin loss HDL structure is altered, and it is unknown what effects proteinuria has on apolipoproteins other than apoE. Two models of albuminuria were used in Sprague-Dawley rats: Adriamycin and passive Heymann nephritis (HN). The adriamycin group was divided into minimal albumin excretion (MAE) and intermediate albumin excretion (MAE, 1 to 40; intermediate albumin excretion, 60 to 210 mg/d per 100 g body wt). Urinary albumin excretion exceeded 300 mg/d per 100 g body wt in the HN rats. HDL apolipoprotein composition was analyzed with SDS-PAGE densitometry and liquid chromatography-time of flight mass spectrometer mass spectrometry. HDL apoA-IV content relative to apoA-I was reduced at all levels of albuminuria (P < 0.0001). ApoE was not reduced in MAE but was significantly reduced in IAE (72%; P < 0.001). By contrast, apoA-II and apoC-III were each significantly increased with increasing UAE. ApoA-IV and apoE were decreased to approximately 10% of control in HDL isolated from rats with HN, whereas apoA-II, apoC-II, and apoC-III were each significantly increased relative to apoA-I. HDL is structurally altered by levels of albuminuria that are insufficient to change serum albumin levels and is progressively altered as albuminuria increases.

Original languageEnglish (US)
Pages (from-to)1309-1319
Number of pages11
JournalJournal of the American Society of Nephrology
Volume16
Issue number5
DOIs
StatePublished - 2005

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Proteinuria
Albumins
Albuminuria
Apolipoproteins E
Membranous Glomerulonephritis
Apolipoprotein C-III
Apolipoprotein A-II
Apolipoproteins A
Apolipoproteins
Apolipoprotein A-I
Doxorubicin
Triglycerides
Apolipoproteins C
Chylomicrons
Hypoalbuminemia
Densitometry
Nephrotic Syndrome
Serum Albumin
Liquid Chromatography
Lipoproteins

ASJC Scopus subject areas

  • Nephrology

Cite this

Graded effects of proteinuria on HDL structure in nephrotic rats. / Shearer, Gregory C.; Newman, John W.; Hammock, Bruce D.; Kaysen, George.

In: Journal of the American Society of Nephrology, Vol. 16, No. 5, 2005, p. 1309-1319.

Research output: Contribution to journalArticle

Shearer, Gregory C. ; Newman, John W. ; Hammock, Bruce D. ; Kaysen, George. / Graded effects of proteinuria on HDL structure in nephrotic rats. In: Journal of the American Society of Nephrology. 2005 ; Vol. 16, No. 5. pp. 1309-1319.
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