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The growth factors and bio molecules in PRP - how PRP works to heal your injuries.
Platelet-Rich Plasma (PRP) therapy involves using a concentration of a patient’s own platelets to accelerate healing. The growth factors present in PRP play a crucial role in this process. Here are the main growth factors found in PRP and their functions:
1. Platelet-Derived Growth Factor (PDGF):
• Function: Stimulates cell growth and division, particularly in blood vessels and collagen production. It is essential for tissue repair and regeneration.
2. Transforming Growth Factor-Beta (TGF-β):
• Function: Regulates inflammation and plays a significant role in the formation of new blood vessels, collagen synthesis, and tissue regeneration. It helps control the immune response to injury.
3. Vascular Endothelial Growth Factor (VEGF):
• Function: Promotes the formation of new blood vessels (angiogenesis). This is critical for supplying nutrients and oxygen to damaged tissues and for the healing process.
4. Epidermal Growth Factor (EGF):
• Function: Stimulates cell growth, differentiation, and survival. It is particularly important in wound healing and the regeneration of the skin and other tissues.
5. Insulin-Like Growth Factor-1 (IGF-1):
• Function: Supports cell growth and development, particularly in bone and muscle tissues. It also helps in the regeneration of damaged tissues and stimulates the production of collagen.
6. Fibroblast Growth Factor (FGF):
• Function: Promotes the proliferation and differentiation of various cell types, including fibroblasts, which are crucial for the formation of connective tissue and wound healing.
7. Hepatocyte Growth Factor (HGF):
• Function: Plays a role in cell growth, cell motility, and morphogenesis. It is particularly important for tissue regeneration and repair, especially in the liver and epithelial tissues.
8. Basic Fibroblast Growth Factor (bFGF):
• Function: Enhances the proliferation of a variety of cells, including endothelial cells that line blood vessels, thus aiding in the formation of new blood vessels and tissue repair.
9. Platelet-Derived Angiogenesis Factor (PDAF):
• Function: Specifically promotes angiogenesis, the development of new blood vessels from pre-existing ones, which is vital for supplying nutrients and oxygen to healing tissues.
These growth factors work synergistically to accelerate tissue repair and regeneration, making PRP therapy effective in treating various conditions such as tendon injuries, osteoarthritis, and enhancing healing after surgical procedures.
In addition to growth factors, Platelet-Rich Plasma (PRP) contains a variety of other biomolecules that contribute to its therapeutic effects. These include:
1. Cytokines:
• Examples: Interleukins (IL-1, IL-6, IL-8), Tumor Necrosis Factor-alpha (TNF-α).
• Functions: These signaling proteins regulate immune responses, inflammation, and tissue repair processes.
2. Adhesion Molecules:
• Examples: Fibrin, Fibronectin, Vitronectin.
• Functions: Facilitate cell adhesion, migration, and the formation of a scaffold for tissue regeneration. Fibrin, in particular, forms a matrix that supports cell growth and tissue repair.
3. Chemokines:
• Examples: Monocyte Chemoattractant Protein-1 (MCP-1), Stromal Cell-Derived Factor-1 (SDF-1).
• Functions: Attract immune cells to the site of injury, aiding in the inflammatory response and subsequent healing process.
4. Proteins:
• Examples: Albumin, Immunoglobulins.
• Functions: Albumin helps maintain osmotic pressure and transports various substances, while immunoglobulins play a role in immune defense.
5. Enzymes and Enzyme Inhibitors:
• Examples: Matrix Metalloproteinases (MMPs) and their inhibitors (TIMPs).
• Functions: MMPs degrade extracellular matrix components, facilitating tissue remodeling, while TIMPs regulate MMP activity to ensure balanced tissue repair.
6. Platelet Microparticles:
• Functions: These small vesicles contain growth factors, cytokines, and other signaling molecules that further contribute to tissue repair and regeneration.
7. Lipid Mediators:
• Examples: Prostaglandins, Leukotrienes.
• Functions: These molecules are involved in the regulation of inflammation and pain, playing a role in the healing process.
8. Hormones:
• Examples: Serotonin.
• Functions: Serotonin released from platelets can contribute to vasoconstriction and wound healing.
9. Extracellular Vesicles (Exosomes):
• Functions: These vesicles carry proteins, lipids, and RNA, and play a role in cell-to-cell communication, promoting tissue repair and regeneration.
These biomolecules collectively enhance the healing properties of PRP by modulating inflammation, promoting cell proliferation and differentiation, and supporting the formation of new blood vessels and extracellular matrix.
Dr Santhosh Jacob
DNB,MCh.,DABRM
Orthopedic & Sports surgeon
Ref
Platelet-Rich Plasma: New Performance Understandings and Therapeutic Considerations in 2020