Types of Angiogenesis - Sprouting angiogenesis is the first identified form of angiogenesis and occurs in several stages. - Intussusceptive angiogenesis involves splitting an existing blood vessel into two. - Coalescent angiogenesis involves the fusion of capillaries to form larger blood vessels.

Physiology of Angiogenesis - Mechanical stimulation of angiogenesis is not well characterised. - Chemical stimulation involves angiogenic proteins and growth factors. - Increased muscle contractions and nitric oxide produced during exercise may increase angiogenesis.

Angiogenic Factors - FGF-2, FGF-1, and FGF-2 stimulate angiogenesis and wound healing. - VEGF and VEGFR-2 play a major role in increasing the number of capillaries. - Angiopoietins Ang1 and Ang2 are required for the formation of mature blood vessels. - MMPs are involved in the degradation of proteins during angiogenesis.

Regulation of Angiogenesis - Dll4 negatively regulates angiogenesis and inhibiting its signaling hinders endothelial cell proliferation and sprouting. - Class 3 semaphorins (SEMA3s) modulate endothelial cell behavior and VEGF signaling. - The relative expression levels of SEMA3s and VEGF-A are important for angiogenesis.

Applications and Implications - Angiogenesis is a therapeutic target for diseases characterised by poor vascularization or abnormal vasculature. - Tumor angiogenesis is necessary for tumor growth and can be targeted for antiangiogenic therapy. - Angiogenesis is important in cardiovascular disease, exercise, macular degeneration, and tissue engineering. - Accurate quantification of angiogenesis is important for studying its role in various diseases and therapies.

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