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[Human apolipoprotein B48 receptor].

A Tanaka1

  • 1Third Department of Internal Medicine, Tokyo Medical and Dental University.

Nihon Rinsho. Japanese Journal of Clinical Medicine
|January 19, 2000
PubMed
Summary
This summary is machine-generated.

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Researchers discovered a new apo B48 receptor in human immune cells that binds and internalizes lipid particles like chylomicrons and VLDL. This finding may explain foam cell formation in atherosclerosis.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Context:

  • Human monocyte-macrophages play a crucial role in lipid metabolism and immune responses.
  • Atherosclerosis is a complex disease characterized by lipid accumulation in arterial walls, leading to foam cell formation.
  • Understanding the mechanisms of lipoprotein uptake by macrophages is vital for developing targeted therapies.

Purpose:

  • To identify and characterize novel membrane binding proteins involved in lipoprotein internalization.
  • To elucidate the binding specificity and mechanism of action of the identified receptor.
  • To investigate the potential role of this receptor in the pathogenesis of atherosclerosis.

Summary:

  • Two novel membrane binding proteins, MBP 200 and 235, were identified in human monocyte-macrophages.

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  • These proteins, collectively named the apo B48 receptor, bind and internalize chylomicrons, triglyceride-rich VLDL, and apo E-deficient VLDL through a domain in apo B48.
  • The apo B48 receptor is distinct from scavenger and LDL receptors, binding VLDL devoid of apo E via an apo E-independent mechanism.
  • Immunohistochemical studies revealed colocalization of the apo B48 receptor with macrophage markers in human atherosclerotic lesion foam cells.

    • Impact:

    • The identification of the apo B48 receptor provides new insights into the cellular mechanisms of lipoprotein processing.
    • This receptor's role in foam cell formation suggests it as a potential therapeutic target for atherosclerosis.
    • Further research into the apo B48 receptor could lead to novel strategies for managing hyperlipidemia and cardiovascular disease.