Chronic endothelin-1 infusion elevates glomerular sieving coefficient and proximal tubular albumin reuptake in the rat

Mohamed A. Saleh, Ruben M. Sandoval, George J. Rhodes, Silvia Campos-Bilderback, Bruce Molitoris, David M. Pollock

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Aim: We have previously found that chronic endothelin-1 (ET-1) infusion in Sprague-Dawley rats increases glomerular permeability to albumin (P alb) as assessed in vitro independent of blood pressure with no observed albuminuria. In this study, we hypothesized that ET-1 increases glomerular albumin filtration with accompanied increase in albumin uptake via the proximal tubule, which masks the expected increase in urinary albumin excretion. Main methods: Nonfasting Munich-Wistar Fromter rats were surgically prepared for in vivo imaging (n = 6). Rats were placed on the microscope stage with the exposed kidney placed in a cover slip-bottomed dish bathed in warm isotonic saline. Rats were then injected i.v. with rat serum albumin conjugated to Texas Red that was observed to enter capillary loops of superficial glomeruli, move into Bowman's space, bind to the proximal tubular cell brush border and reabsorbed across the apical membrane. Glomerular sieving coefficient (GSC) was calculated as the ratio of conjugated albumin within the glomerular capillary versus that in Bowman's space. Rats were again studied after 2 weeks of chronic ET-1 (2 pmol/kg/min; i.v. osmotic minipump). Key findings: Glomerular sieving coefficient was significantly increased in rats following chronic ET-1 infusion (0.025 ± 0.005 vs. 0.017 ± 0.003, p < 0.05). Mean fluorescence intensity for conjugated albumin within proximal tubules was increased by ET-1 infusion: 118.40 ± 6.34 vs. 74.27 ± 4.45 pixel intensity (p < 0.01). Significance: These data provide in vivo evidence that ET-1 directly increases glomerular permeability to albumin and that albuminuria is prevented by increased PT albumin uptake in the rat.

Original languageEnglish
Pages (from-to)634-637
Number of pages4
JournalLife Sciences
Volume91
Issue number13-14
DOIs
StatePublished - Oct 15 2012

Fingerprint

Endothelin-1
Rats
Albumins
Albuminuria
Permeability
Endothelin-2
Blood pressure
Brushes
Masks
Microvilli
Serum Albumin
Sprague Dawley Rats
Wistar Rats
Microscopes
Fluorescence
Pixels
Blood Pressure
Membranes
Kidney
Imaging techniques

Keywords

  • Albumin reuptake
  • Endothelin
  • Glomerular sieving coefficient
  • Intravital 2-photon microscopy
  • Kidney
  • Proximal tubule
  • Rat

ASJC Scopus subject areas

  • Pharmacology, Toxicology and Pharmaceutics(all)
  • Biochemistry, Genetics and Molecular Biology(all)

Cite this

Chronic endothelin-1 infusion elevates glomerular sieving coefficient and proximal tubular albumin reuptake in the rat. / Saleh, Mohamed A.; Sandoval, Ruben M.; Rhodes, George J.; Campos-Bilderback, Silvia; Molitoris, Bruce; Pollock, David M.

In: Life Sciences, Vol. 91, No. 13-14, 15.10.2012, p. 634-637.

Research output: Contribution to journalArticle

Saleh, Mohamed A. ; Sandoval, Ruben M. ; Rhodes, George J. ; Campos-Bilderback, Silvia ; Molitoris, Bruce ; Pollock, David M. / Chronic endothelin-1 infusion elevates glomerular sieving coefficient and proximal tubular albumin reuptake in the rat. In: Life Sciences. 2012 ; Vol. 91, No. 13-14. pp. 634-637.
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T1 - Chronic endothelin-1 infusion elevates glomerular sieving coefficient and proximal tubular albumin reuptake in the rat

AU - Saleh, Mohamed A.

AU - Sandoval, Ruben M.

AU - Rhodes, George J.

AU - Campos-Bilderback, Silvia

AU - Molitoris, Bruce

AU - Pollock, David M.

PY - 2012/10/15

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AB - Aim: We have previously found that chronic endothelin-1 (ET-1) infusion in Sprague-Dawley rats increases glomerular permeability to albumin (P alb) as assessed in vitro independent of blood pressure with no observed albuminuria. In this study, we hypothesized that ET-1 increases glomerular albumin filtration with accompanied increase in albumin uptake via the proximal tubule, which masks the expected increase in urinary albumin excretion. Main methods: Nonfasting Munich-Wistar Fromter rats were surgically prepared for in vivo imaging (n = 6). Rats were placed on the microscope stage with the exposed kidney placed in a cover slip-bottomed dish bathed in warm isotonic saline. Rats were then injected i.v. with rat serum albumin conjugated to Texas Red that was observed to enter capillary loops of superficial glomeruli, move into Bowman's space, bind to the proximal tubular cell brush border and reabsorbed across the apical membrane. Glomerular sieving coefficient (GSC) was calculated as the ratio of conjugated albumin within the glomerular capillary versus that in Bowman's space. Rats were again studied after 2 weeks of chronic ET-1 (2 pmol/kg/min; i.v. osmotic minipump). Key findings: Glomerular sieving coefficient was significantly increased in rats following chronic ET-1 infusion (0.025 ± 0.005 vs. 0.017 ± 0.003, p < 0.05). Mean fluorescence intensity for conjugated albumin within proximal tubules was increased by ET-1 infusion: 118.40 ± 6.34 vs. 74.27 ± 4.45 pixel intensity (p < 0.01). Significance: These data provide in vivo evidence that ET-1 directly increases glomerular permeability to albumin and that albuminuria is prevented by increased PT albumin uptake in the rat.

KW - Albumin reuptake

KW - Endothelin

KW - Glomerular sieving coefficient

KW - Intravital 2-photon microscopy

KW - Kidney

KW - Proximal tubule

KW - Rat

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