Related Experiment Video
Updated: Aug 7, 2026
07:51
Synovial Fluid Analysis to Identify Osteoarthritis
Published on: October 20, 2022
[Complement (C3)-activating material in synovial fluid from patients with rheumatoid arthritis]
Zeitschrift Fur Rheumatologie
|September 1, 1981
Summary
Rheumatoid arthritis (RA) synovial fluid shows higher C3 cleaving activity and breakdown products than osteoarthrosis. Benign rheumatoid arthritis (BRA) levels fall in between, suggesting diagnostic potential for these C3 cleaving activities.
Area of Science:
- Immunology
- Biochemistry
Context:
- Synovial fluid analysis is crucial for diagnosing joint diseases.
- Rheumatoid arthritis (RA) and osteoarthrosis (A) are common joint conditions with distinct pathological mechanisms.
- Understanding complement system involvement, particularly complement component 3 (C3), is key in inflammatory arthritis.
Purpose:
- To investigate and compare C3 cleaving activity and complement component levels in synovial fluid from patients with rheumatoid arthritis (RA), benign rheumatoid arthritis (BRA), and osteoarthrosis (A).
- To identify specific molecular characteristics associated with C3 cleavage in different arthritic conditions.
Summary:
- Synovial fluid sediments from RA, BRA, and A patients were analyzed for C3 cleaving activity and concentrations of immunoglobulins (IgG, IgM, IgA) and complement components (C3, C4, C3-proactivator).
- Significantly higher C3 cleaving activity was observed in RA compared to osteoarthrosis, with BRA exhibiting intermediate levels.
- Increased C3 breakdown products were detected in RA and BRA, linked to very large molecules, while immunoglobulin levels showed no significant diagnostic differences after centrifugation.
Impact:
- These findings highlight distinct C3 cleavage patterns in RA and osteoarthrosis, suggesting potential diagnostic utility.
- The identification of large molecules responsible for C3 cleavage offers new avenues for understanding RA pathogenesis.
- This research provides valuable insights into the role of the complement system in differentiating arthritic conditions.
Related Concept Videos
01:22Connective Tissue Cell Types
Connective tissue develops from the mesoderm of a developing embryo and consists of cells, fibers, and ground substance: a gel-like material containing large complexes of carbohydrates and proteins. Connective tissue was first identified as a separate tissue family in the 18th century, and Johannes Peter Muller coined the term connective tissue.
Fat cells (adipocytes), smooth muscle cells (myoblasts), and bone cells (osteoblasts) are some connective tissue cell types. Some immune system cells...
Fat cells (adipocytes), smooth muscle cells (myoblasts), and bone cells (osteoblasts) are some connective tissue cell types. Some immune system cells...
01:20The JAK-STAT Signaling Pathway
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...
01:24T Cell Types and Functions
When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
01:27Complement System
The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a membrane...
01:19Hypersensitivity Reactions: Immune-Complex Reactions
Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...