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Reverse cholesterol transport and hepatic osteodystrophy.

Mone Zaidi1, Tony Yuen1, Jameel Iqbal1

  • 1Mount Sinai Bone Program and Center for Translational Medicine and Pharmacology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.

Cell Metabolism
|March 2, 2022
PubMed
Summary
This summary is machine-generated.

Chronic liver disease elevates PP2Ac, reducing lecithin-cholesterol acyltransferase (LCAT) which protects bone. Lowered LCAT in liver injury causes bone loss and fibrosis, suggesting LCAT therapy potential.

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Area of Science:

  • Biochemistry
  • Hepatology
  • Bone Metabolism

Background:

  • Chronic liver disease is linked to bone loss and worsening liver fibrosis.
  • Lecithin-cholesterol acyltransferase (LCAT) is a liver-derived enzyme crucial for bone protection.
  • Reduced LCAT levels are observed in progressive liver injury, contributing to hepatic osteodystrophy (HOD).

Purpose of the Study:

  • To investigate the role of PP2Ac in regulating LCAT activity during chronic liver disease.
  • To explore the connection between LCAT deficiency, HOD, and liver fibrosis progression.
  • To assess the therapeutic potential of LCAT for liver disease complications.

Main Methods:

  • The study examined the expression and activity of PP2Ac in the context of chronic liver disease.
  • LCAT levels and activity were assessed in relation to liver injury and bone health markers.
  • The impact of altered LCAT levels on liver fibrosis was evaluated.

Main Results:

  • Chronic liver disease was found to increase the expression and activity of PP2Ac.
  • PP2Ac was identified as a phosphatase that downregulates LCAT excretion.
  • Lowered LCAT levels in progressive liver injury were confirmed to cause HOD and exacerbate liver fibrosis.

Conclusions:

  • PP2Ac upregulation in chronic liver disease impairs LCAT function, leading to bone loss and fibrosis.
  • Restoring LCAT levels may offer a novel therapeutic strategy for managing HOD and liver fibrosis.
  • Targeting the PP2Ac-LCAT axis presents a promising avenue for treating complications of chronic liver disease.