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A Novel Pool of Microparticle Cholesterol Is Elevated in Rheumatoid Arthritis but Not in Systemic Lupus Erythematosus
Shuaishuai Hu1,2, Brenton L Cavanagh3, Robert Harrington4
1School of Biological and Health Sciences, College of Sciences and Health, Technological University Dublin-City Campus, D08 NF82 Dublin 8, Ireland.
Abstract:
Microparticles are sub-micron, membrane-bound particles released from virtually all cells and which are present in the circulation. In several autoimmune disorders their amount and composition in the circulation is altered. Microparticle surface protein expression has been explored as a differentiating tool in autoimmune disorders where the clinical pictures can overlap. Here, we examine the utility of a novel lipid-based marker-microparticle cholesterol, present in all microparticles regardless of cellular origin-to distinguish between rheumatoid arthritis (RA) and systemic lupus erythematosus (SLE). We first isolated a series of microparticle containing lipoprotein deficient fractions from patient and control plasma. There were no significant differences in the size, structure or protein content of microparticles isolated from each group. Compared to controls, both patient groups contained significantly greater amounts of platelet and endothelial cell-derived microparticles. The cholesterol content of microparticle fractions isolated from RA patients was significantly greater than those from either SLE patients or healthy controls. Our data indicate that circulating non-lipoprotein microparticle cholesterol, which may account for 1-2% of measured cholesterol in patient samples, may represent a novel differentiator of disease, which is independent of cellular origin.
Insights
Microparticle cholesterol may help differentiate rheumatoid arthritis (RA) from systemic lupus erythematosus (SLE). This novel marker, found in all microparticles, showed higher levels in RA patients compared to SLE patients and healthy controls.
Area of Science:
- Biochemistry
- Immunology
- Clinical Diagnostics
Background:
- Microparticles are circulating cell-derived vesicles implicated in autoimmune disorders.
- Current diagnostic tools for autoimmune diseases like rheumatoid arthritis (RA) and systemic lupus erythematosus (SLE) can overlap clinically.
- Microparticle surface protein expression is a known differentiator, but a lipid-based marker is explored here.
Purpose of the Study:
- To investigate microparticle cholesterol as a novel biomarker to distinguish between RA and SLE.
- To assess if microparticle cholesterol levels differ in RA, SLE, and healthy individuals.
Main Methods:
- Isolation of microparticle-rich fractions from patient and control plasma.
- Analysis of microparticle size, structure, protein content, and cholesterol levels.
- Comparison of microparticle characteristics across RA patients, SLE patients, and healthy controls.
Main Results:
- No significant differences in microparticle size, structure, or protein content were observed between groups.
- Both RA and SLE patients showed increased levels of platelet and endothelial cell-derived microparticles compared to controls.
- Microparticle cholesterol levels were significantly higher in RA patients than in SLE patients or healthy controls.
Conclusions:
- Circulating non-lipoprotein microparticle cholesterol is a potential novel differentiator for RA and SLE.
- This lipid-based marker is independent of microparticle cellular origin.
- Microparticle cholesterol may represent a valuable diagnostic tool in autoimmune disease differentiation.
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