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Related Experiment Video

Updated: Jul 2, 2026

Implementing Patch Clamp and Live Fluorescence Microscopy to Monitor Functional Properties of Freshly Isolated PKD Epithelium
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Pathophysiologic glomerulotubular growth factor link.

S N Wang1, J LaPage, R Hirschberg

  • 1Division of Nephrology and Hypertension, Harbor-UCLA Medical Center and UCLA, Torrance, CA 90509, USA.

Mineral and Electrolyte Metabolism
|February 22, 2000
PubMed
Summary
This summary is machine-generated.

Glomerular ultrafiltration of growth factors like IGF-I, TGF-beta, and HGF contributes to tubulointerstitial injury in proteinuric kidney diseases. These filtered proteins may alter tubular function and cell behavior, driving disease progression.

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Identification of the Source of Secreted Proteins in the Kidney by Brefeldin A Injection

Published on: November 10, 2021

Area of Science:

  • Nephrology
  • Molecular Biology
  • Pathology

Background:

  • Clinical and pathologic studies suggest protein ultrafiltration in glomerular diseases causes tubulointerstitial injury.
  • The role of specific ultrafiltered growth factors in this process remains unclear.

Purpose of the Study:

  • To investigate the hypothesis that high molecular weight growth factors are ultrafiltered into tubular fluid.
  • To examine the effects of these ultrafiltered growth factors on tubular cells in experimental nephropathies.

Main Methods:

  • Nephron micropuncture to collect proximal tubular fluid in rats with adriamycin-induced or diabetic nephropathy.
  • Immunohistochemistry to detect growth factor receptors on nephron segments.
  • In vitro cell culture experiments using collected tubular fluid.

Main Results:

  • Insulin-like growth factor-I (IGF-I), transforming growth factor-beta (TGF-beta), and hepatocyte growth factor (HGF) were detected in tubular fluid.
  • Apical membrane receptors for these growth factors are expressed in the nephron.
  • Ultrafiltered IGF-I may increase distal tubular sodium absorption and collagen secretion.
  • TGF-beta and HGF increase MCP-1 expression and secretion in tubular cells.

Conclusions:

  • Glomerular ultrafiltration of bioactive proteins, including growth factors, contributes to tubulointerstitial pathology in proteinuric glomerular diseases.
  • Apical exposure of tubular cells to ultrafiltered growth factors has significant biologic effects.
  • This mechanism represents a key pathway in the progression of kidney damage.