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Uptake of acetyl low density lipoprotein (LDL) by stimulated canine macrophages

Y Kagawa1, E Uchida, H Nagahata

  • 1Department of Veterinary Pathology, School of Veterinary Medicine, Rakuno Gakuen University, Hokkaido, Japan.

The Journal of Veterinary Medical Science
|July 23, 1998
PubMed

Insights

Canine monocytes can take up acetylated low-density lipoprotein (LDL) via scavenger receptors, differentiating into foamy macrophages. This process is crucial in the early stages of canine atherosclerosis.

Area of Science:

  • Cardiovascular Research
  • Immunology
  • Cell Biology

Background:

  • Monocytes play a role in the development of atherosclerotic lesions.
  • Lipoprotein uptake by monocytes is a key event in atherogenesis.

Purpose of the Study:

  • To investigate the receptor-mediated uptake of acetylated low-density lipoprotein (LDL) by canine monocytes.
  • To clarify the role of monocytes in the initial stages of canine atherosclerotic lesions.

Main Methods:

  • Canine peripheral blood monocytes were isolated and stimulated.
  • Cells were treated with phorbol 12-myristate 13-acetate (PMA) to induce differentiation.
  • Uptake of acetyl LDL and native LDL was measured.
  • Inhibition studies were performed using maleyl canine serum albumin (MSA).

Main Results:

  • PMA-treated canine monocytes effectively took up acetyl LDL, differentiating into foamy macrophages.
  • The uptake of acetyl LDL was specifically inhibited by MSA in a dose-dependent manner.
  • Canine monocytes did not exhibit uptake of native LDL under these conditions.

Conclusions:

  • Canine monocytes possess a specific scavenger receptor pathway for acetyl LDL uptake.
  • This receptor-mediated uptake mechanism is implicated in the early pathogenesis of canine atherosclerosis.
  • Monocytes are critical players in the initiation of atherosclerotic lesion development in canines.

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