VEGF, Plasma

Elevated levels of Vascular Endothelial Growth Factor (VEGF) in plasma are significant because VEGF is a key regulator of angiogenesis, the process by which new blood vessels are formed. When plasma VEGF levels are increased, it often indicates heightened vascular activity or abnormal blood vessel growth, which can be associated with various physiological and pathological conditions. Here's what elevated VEGF plasma levels can signify:

1. Cancer and Tumor Growth: One of the most common associations with elevated VEGF is cancer. Tumors require a blood supply to grow and metastasize, and VEGF plays a critical role in promoting the formation of new blood vessels to supply nutrients and oxygen to the tumor. High plasma levels of VEGF are often observed in cancers such as breast, lung, colon, and kidney cancer. In many cases, measuring VEGF levels can serve as a biomarker to assess tumor progression, aggressiveness, or response to anti-angiogenic treatments that target VEGF pathways.

2. Inflammatory and Autoimmune Diseases: VEGF levels can also be elevated in chronic inflammatory or autoimmune diseases. Conditions like rheumatoid arthritis, psoriasis, and inflammatory bowel disease are linked to increased VEGF levels due to the chronic inflammation stimulating abnormal blood vessel growth in affected tissues. Elevated VEGF in these diseases contributes to the thickening of the synovial tissue (in rheumatoid arthritis, for example) and the development of inflammation-related complications.

3. Cardiovascular Conditions: VEGF plays a role in the body's response to ischemia, a condition where tissues don't get enough oxygen due to restricted blood flow. In individuals with cardiovascular diseases like coronary artery disease or peripheral artery disease, elevated plasma VEGF levels may indicate an attempt by the body to form new blood vessels to restore proper blood flow to oxygen-deprived tissues. However, while VEGF may be protective in some cases, its excessive expression could also lead to the formation of fragile or dysfunctional vessels that may not effectively support tissue repair.

4. Eye Diseases: In diseases such as age-related macular degeneration (AMD) and diabetic retinopathy, elevated VEGF levels contribute to abnormal blood vessel growth in the retina. These vessels are often fragile and prone to leakage, leading to vision loss. VEGF inhibitors are a common treatment for these conditions to reduce vascular abnormalities and preserve vision. Monitoring VEGF levels can help gauge the severity and progression of these diseases.

In summary, elevated VEGF plasma levels typically signify increased angiogenesis and are associated with cancer, inflammation, ischemic conditions, and certain eye diseases. Measuring VEGF can be a useful diagnostic and prognostic tool in assessing disease activity and guiding targeted therapies.

The significance of a VEGF level that is too low is unknown.

VEGF stands for Vascular Endothelial Growth Factor. VEGF is a growth factor that promotes the growth of new blood vessels. The body makes VEGF in response to low oxygen levels, also known as hypoxia. Thus, when tissues are receiving too little oxygen rich blood flow, VEGF is produced to provide a better blood supply to the tissues. VEGF also increases the permeability or leakiness of blood vessels. In fact, one form of VEGF, VEGF-A was once known as vascular permeability factor. VEGF plays a role in cell metabolism, bone formation, and blood cell creation (hematopoiesis). Unfortunately, cancer cells also produce VEGF to help improve their own blood flow. Interestingly, cancer treatments have been developed to block the action of VEGF to starve cancerous tumors of blood flow.