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Super paramagnetic iron oxide MRI shows defective Kupffer cell uptake function in non-alcoholic fatty liver disease

Taketoshi Asanuma1, Masafumi Ono, Kei Kubota

  • 1Department of Radiology, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Hokkaido, Japan.

Gut
|November 19, 2009
PubMed
Abstract

Insights

Kupffer cell (KC) phagocytic function is impaired in non-alcoholic fatty liver disease (NAFLD), worsening with steatosis severity. This defect stems from reduced uptake, not fewer KCs, impacting liver health.

Area of Science:

  • Hepatology
  • Immunology
  • Radiology

Background:

  • Non-alcoholic fatty liver disease (NAFLD) pathogenesis is not fully understood.
  • Kupffer cells (KCs) are crucial for liver barrier function against endotoxin.
  • The impact of NAFLD on KC phagocytic function remains unclear.

Purpose of the Study:

  • To assess Kupffer cell (KC) uptake function in NAFLD patients and animal models using SPIO-MRI.
  • To correlate KC function with the degree of steatosis in NAFLD.

Main Methods:

  • Super-paramagnetic iron oxide (SPIO) magnetic resonance imaging (MRI) evaluated KC function.
  • CT and liver histology assessed steatosis severity in patients and rats.
  • Immunohistochemistry quantified KC numbers, and microbead uptake assays measured phagocytic capacity in rats.

Main Results:

  • Relative signal enhancement (RSE), indicating impaired KC function, was higher in NAFLD patients and NASH rats compared to controls.
  • RSE positively correlated with steatosis degree in both patients and animals.
  • Defective KC function was attributed to reduced phagocytic uptake, not decreased KC numbers.

Conclusions:

  • KC phagocytic uptake function is significantly impaired in NAFLD and NASH.
  • The impairment worsens with increasing steatosis severity.
  • Reduced KC numbers do not explain the observed functional deficit in NAFLD.

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