CYR61 delivery promotes angiogenesis during bone fracture repair
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
View abstract on PubMed
Summary
This summary is machine-generated.Cysteine-rich angiogenic inducer of 61kD (CYR61) enhances blood vessel formation during bone repair. This growth factor shows therapeutic potential for fractures with poor vascular supply, especially with stable fixation.
Area Of Science
- Biomedical Engineering
- Regenerative Medicine
- Orthopedics
Background
- Bone repair is often hindered by poor vascular supply and inadequate new blood vessel formation (neovascularization).
- Cysteine-rich angiogenic inducer of 61kD (CYR61), also known as CCN1, is a matricellular growth factor involved in fracture healing.
- Understanding CYR61's role and therapeutic potential is crucial for improving bone regeneration.
Purpose Of The Study
- To map the distribution of endogenous CYR61 during the bone repair process.
- To evaluate the impact of recombinant CYR61 administration on vascularized bone regeneration.
- To investigate the influence of mechanical loading on CYR61-mediated bone repair.
Main Methods
- In vitro studies assessed CYR61's effect on chondrogenesis and osteogenic gene expression, alongside angiogenesis.
- A mouse femoral fracture model was utilized to study CYR61 delivery's effects on bone healing and neovascularization.
- The interaction between CYR61-induced neovascularization and early mechanical loading was examined.
Main Results
- In vitro, CYR61 significantly boosted angiogenesis without affecting chondrogenesis or osteogenic gene expression.
- In vivo, CYR61 delivery accelerated neovascularization in a mouse fracture model, without altering cartilage or bone formation.
- Early mechanical loading interfered with CYR61-stimulated neovascularization.
Conclusions
- CYR61 delivery effectively enhances angiogenesis during bone fracture repair.
- This effect is particularly beneficial for fractures with stable fixation and compromised vascular supply.
- CYR61 presents potential as a therapeutic agent for non-union fractures lacking sufficient blood vessel formation.
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
Related Concept Videos
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...
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...
Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
Hormonal Control of Bone Remodeling
Parathyroid hormone (PTH) maintains homeostatic control of blood calcium levels by regulating bone resorption. PTH is...
Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the...