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Related Experiment Videos

Immunoglobulin light chains generate hydrogen peroxide.

Pei-Xuan Wang1, Paul W Sanders

  • 1Division of Nephrology/Department of Medicine, 642 Lyons-Harrison Research Building, 1530 Third Avenue, S., University of Alabama at Birmingham, Birmingham, AL 35294-0007, USA.

Journal of the American Society of Nephrology : JASN
|March 16, 2007
PubMed
Summary
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Immunoglobulin light chains can cause oxidative stress in kidney proximal tubule cells, leading to inflammation and damage. This finding is relevant for patients with plasma cell dyscrasias.

Area of Science:

  • Nephrology
  • Molecular Biology
  • Cellular Biology

Background:

  • Low molecular weight immunoglobulin (Ig) light chains are filtered by glomeruli and reabsorbed by proximal tubule epithelium.
  • Accumulation of Ig light chains in proximal tubules can alter cell function, particularly in plasma cell dyscrasias.

Purpose of the Study:

  • To investigate the mechanism by which Ig light chains affect proximal tubule cells.
  • To determine if Ig light chains induce oxidative stress and subsequent cellular responses.

Main Methods:

  • HK-2 cells were incubated with Ig light chains.
  • Hydrogen peroxide production was measured.
  • Monocyte chemoattractant protein-1 (MCP-1) production and lactate dehydrogenase (LDH) release were assessed.
  • Inhibitors of reactive oxygen species (ROS) and NF-kappaB were used to block light chain effects.

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Main Results:

  • Ig light chains catalyzed hydrogen peroxide production in HK-2 cells.
  • This resulted in increased MCP-1 production and LDH release.
  • The effects were inhibited by 1,3-dimethyl-2-thiourea (ROS inhibitor) and pyrrolidine dithiocarbamate (NF-kappaB inhibitor).
  • Observed light chain levels were within the range found in patients with plasma cell dyscrasias.

Conclusions:

  • Ig light chains induce intracellular oxidative stress in proximal tubule cells.
  • This oxidative stress activates proximal tubules and promotes MCP-1 elaboration, contributing to kidney damage.
  • These findings highlight a novel mechanism of kidney injury in plasma cell dyscrasias.