Related Experiment Video
Updated: Aug 11, 2026

09:58
A 3D System for Culturing Human Articular Chondrocytes in Synovial Fluid
Published on: January 31, 2012
Angiogenic factor from synovial fluid resembling that from tumours
Lancet (London, England)
|March 29, 1980
Summary
A low-molecular-weight angiogenesis factor was found in synovial fluid from patients with osteoarthritis, rheumatoid arthritis, and ankylosing spondylitis. This factor may play a role in the development of synovial exudate in these conditions.
Area of Science:
- Rheumatology
- Oncology
- Biochemistry
Background:
- Synovial fluid analysis is crucial for diagnosing joint diseases.
- Angiogenesis, the formation of new blood vessels, is implicated in various pathological conditions, including cancer and inflammatory diseases.
Purpose of the Study:
- To investigate the presence and characteristics of angiogenesis factors in the synovial fluid of patients with different arthropathies.
- To determine if tumor-derived angiogenesis factors are present in synovial fluid and correlate with specific joint conditions.
Main Methods:
- Analysis of synovial fluid samples from patients diagnosed with osteoarthritis, rheumatoid arthritis, ankylosing spondylitis, and psoriatic arthropathy.
- Assay for low-molecular-weight angiogenesis factor activity, comparing findings to tumor-derived factors.
Main Results:
- A low-molecular-weight angiogenesis factor was detected in synovial fluid from patients with osteoarthritis, rheumatoid arthritis, and ankylosing spondylitis.
- The highest concentration of this factor was observed in patients with osteoarthritis.
- No angiogenesis factor was detected in synovial fluid from patients with psoriatic arthropathy.
Conclusions:
- The presence of a tumor-like angiogenesis factor in synovial fluid suggests its potential role in joint pathology.
- Angiogenesis factor may be involved in the pathogenesis of synovial exudate formation in certain inflammatory and degenerative joint diseases.
Related Concept Videos
Adaptive Mechanisms in Cancer Cells
Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
Some of the advantages that cancer cells have on normal cells include - enhanced ability to divide without terminally differentiating, induce new blood vessel formation,...
Some of the advantages that cancer cells have on normal cells include - enhanced ability to divide without terminally differentiating, induce new blood vessel formation,...
The Tumor Microenvironment
Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
Mechanism of Angiogenesis
Blood vessel formation starts early during embryonic development, around day 7. In the extraembryonic yolk sac, mesodermal precursor cells called hemangioblast proliferate and differentiate into angioblast. Angioblasts express vascular endothelial growth factor receptor 2 or VEGFR2, which binds VEGF-A, a proangiogenic factor, guiding blood vessel formation. VEGF signaling promotes angioblasts to form a blood island in the developing embryo. Angioblasts further differentiate, giving rise to...
Regulation of Angiogenesis and Blood Supply
Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...
Inflammatory Response II: Inflammatory Exudate and Tissue Repair
The immune system's inflammatory response destroys the invading pathogen, permitting the tissue to heal. The changes during the cellular and vascular stages allow exudate formation at the site of inflammation. The inflammatory exudate released from the wound has high protein content and a specific gravity above 1.020.
The typical wound exudate is odorless, transparent, straw-colored, thin, and watery. Exudate, however, can differ depending on the state of wound healing. Likewise, the exudate's...
The typical wound exudate is odorless, transparent, straw-colored, thin, and watery. Exudate, however, can differ depending on the state of wound healing. Likewise, the exudate's...
Cytotoxic Edema: Pathophysiology
Cytotoxic edema is a form of cerebral edema characterized by intracellular swelling of neurons, astrocytes, and other glial cells. It develops when the mechanisms responsible for maintaining ionic gradients across the cell membrane become impaired. Under normal physiological conditions, the sodium–potassium ATPase actively transports sodium ions out of the cell and potassium ions into the cell, preserving osmotic balance and enabling electrical signaling. This pump requires a continuous supply...

