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Updated: Aug 19, 2026
Depletion and Reconstitution of Macrophages in Mice
Published on: August 1, 2012
[Effect of modified low density lipoproteins on humoral immune response and functional activity of macrophages in
A F Poveshchenko1, O M Perminova, M I Dushkin
1Institute of Clinical Immunology, Institute of Therapy, Siberian Branch, Russian Acad. Med. Sci., Novosibirsk, Russia.
Abstract:
Intravenous injection of acetylated low density lipoproteins (acLDL) in mice in a dose of 0.5 mg per mouse decreased the intensity of humoral immune response to sheep red blood cells (SRBC) by 35%. The addition of acLDL to mouse peritoneal macrophages in vitro resulted in inhibition of Fc-dependent phagocytosis of SRBC and fourfold increased secretion of prostaglandins E2 by macrophages. Fc-dependent phagocytosis of SRBC was also found to be inhibited by oxysterols (25-hydroxycholesterol and 7-ketocholesterol), added to the incubation medium of macrophages in vitro in doses of 0.5-5 mg/ml. The conclusion was made that oxidative metabolism of cholesterol and arachidonic acid, contained in LDL, may mediate the immunomodulating effects of modified LDL.
Insights
Modified lipoproteins (acLDL) suppress immune responses in mice by inhibiting phagocytosis and increasing prostaglandin E2 secretion. This suggests oxidative metabolism of LDL components may mediate these immunomodulatory effects.
Area of Science:
- Immunology
- Biochemistry
Context:
- Modified lipoproteins, such as acetylated low-density lipoproteins (acLDL), play a role in immune modulation.
- Lipoprotein metabolism and its impact on immune cell function are areas of active research.
Purpose:
- To investigate the immunomodulatory effects of acetylated low-density lipoproteins (acLDL) in vivo and in vitro.
- To explore the mechanisms by which acLDL affects macrophage function and immune response intensity.
Summary:
- Intravenous injection of acLDL in mice reduced the humoral immune response to sheep red blood cells (SRBC) by 35%.
- In vitro studies showed acLDL inhibited Fc-dependent phagocytosis of SRBC by macrophages and increased prostaglandin E2 secretion.
- Oxysterols, products of cholesterol oxidation, also inhibited Fc-dependent phagocytosis, suggesting a role for oxidative metabolism.
Impact:
- Findings suggest that oxidative metabolism of cholesterol and arachidonic acid within LDL may mediate the immunomodulatory effects of modified LDL.
- This research provides insights into how lipoprotein modification can influence immune system function, potentially impacting inflammatory and autoimmune conditions.
