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How Bloods Vessels are Linked Together?

The Scientists at Karolinska Institutet have discovered a heretofore-unknown mechanism for -how the body links together its blood vessels.//

New blood vessels are formed when a "shoot" sprouts from an already existing vessel. These shoots lengthen, branch off and contact other vessels as they form communicating networks of channels. The process is called "angiogenesis" and is important in foetal development and normal tissue formation in connection with the healing of wounds, the menstrual cycle and so on. However, it also plays a critical part in morbid tissue formation, such as cancer and chronic inflammatory diseases.

The inhibition of morbid angiogenesis therefore has very attractive therapeutic potential for a variety of diseases. Tumours, for instance, can grow no larger than 1 or 2 mm without new blood vessels, upon which they are dependent for their proliferation. To date, anti-angiogenic therapy has proved effective in the treatment of colon cancer and the common eye disease AMD (Age-dependent Macula Degeneration).

All therapies have so far targeted the growth factor VEGF (Vascular Endothelial Growth Factor). VEGF controls several important functions during the formation of blood vessels by signaling via receptors on the surface of the endothelial cells, the specialised layer of cells on the interior surface of the blood vessels.

Swedish scientists at Karolinska Institutet and the biotech company AngioGenetics AB have now shown that another factor called Dll4 (Delta-like 4) has a similarly fundamental role in blood vessel formation as VEGF. The results are published in Nature no. 28 (January 2007) and can mean that Dll4 is just as important a target for anti-angiogenic drugs as VEGF.

"We can now develop ways of boosting the effect of existing anti-angiogenic therapies, and maybe we can even start to treat tumour types that do not currently respond to anti-angiogenic drugs," says Mats Hellstr?m, one
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