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Adipocytes recognize and degrade oxidized low density lipoprotein through CD36
Akihiko Kuniyasu1, Shigeki Hayashi, Hitoshi Nakayama
1Department of Biofunctional Chemistry, Faculty of Pharmaceutical Sciences, Kumamoto University, 5-1 Ohe-Honmachi, Kumamoto 862-0973, Japan.
Biochemical and Biophysical Research Communications
|August 2, 2002
Summary
Adipocytes, or fat cells, can engulf and break down oxidized low-density lipoprotein (OxLDL) through a process mediated by CD36. This suggests a new role for CD36 in adipose tissue, similar to macrophage function.
Area of Science:
- Cell Biology
- Metabolic Research
- Immunology
Background:
- CD36 is known to function as a fatty acid transporter (FAT) on adipocytes.
- The role of adipocytes in the uptake and degradation of oxidized low-density lipoprotein (OxLDL) is not fully understood.
Purpose of the Study:
- To investigate the role of CD36 in the endocytosis and lysosomal degradation of OxLDL by adipocytes.
- To determine if adipocytes exhibit phagocytic capabilities similar to macrophages.
Main Methods:
- Utilized mouse 3T3-L1 preadipocytes differentiated into adipocytes.
- Measured the uptake and degradation of radio-labeled OxLDL ((125)I-OxLDL).
- Employed RT-PCR and immunoblot analysis to assess gene and protein expression.
- Used anti-CD36 antibodies to block CD36 function.
Main Results:
- Differentiated adipocytes showed a significant increase in the uptake and degradation of (125)I-OxLDL compared to preadipocytes.
- CD36 expression was essential for this increased uptake and degradation, while scavenger receptor class A and macrosialin were not.
- Inhibition of CD36 with an antibody reduced OxLDL uptake and degradation by up to 60%.
Conclusions:
- Adipocytes possess the ability to endocytose and degrade OxLDL, mediated primarily by CD36.
- CD36 plays a novel role in adipose tissues, enabling adipocytes to function similarly to macrophages in engulfing and degrading OxLDL.
- These findings reveal a previously unrecognized function of adipocytes in lipid metabolism and immune surveillance within adipose tissue.