Angioworld

Angioworld Process of Angiogenesis
Physiological and pathological angiogenesis

Angioworld

Almost all tissues develop a vascular network that provides cells with nutrients and oxygen and enables them to eliminate metabolic wastes. Once formed, the vascular network is a stable system that regenerates slowly.

In physiological conditions, angiogenesis occurs primarily in embryo development, during wound healing and in response to ovulation.
However, pathological angiogenesis, or the abnormal rapid proliferation of blood vessels, is implicated in over 20 diseases, including cancer, psoriasis and age-related macular degeneration.

Angioworld

The angiogenic sequence

Angioworld

The angiogenic process, as currently understood, can be summarized as follows:

A cell activated by a lack of oxygen releases angiogenic molecules that attract inflammatory and endothelial cells and promote their proliferation.
During their migration, inflammatory cells also secrete molecules that intensify the angiogenic stimuli.
The endothelial cells that form the blood vessels respond to the angiogenic call by differentiating and by secreting matrix metalloproteases (MMP), which digest the blood-vessel walls to enable them to escape and migrate toward the site of the angiogenic stimuli.
Several protein fragments produced by the digestion of the blood-vessel walls intensify the proliferative and migratory activity of endothelial cells, which then form a capillary tube by altering the arrangement of their adherence-membrane proteins.
Finally, through the process of anastomosis, the capillaries emanating from the arterioles and the venules will join, thus resulting in a continuous blood flow.

Angioworld

The normal regulation of angiogenesis is governed by a fine balance between factors that induce the formation of blood vessels and those that halt or inhibit the process. When this balance is destroyed, it usually results in pathological angiogenesis which causes increased blood-vessel formation in diseases that depend on angiogenesis.

More than 20 endogenous positive regulators of angiogenesis have been described, including growth factors, matrix metalloproteinases, cytokines, and integrins. Growth factors, such as vascular endothelial growth factor (VEGF), transforming growth factors (TGF-beta), fibroblast growth factors (FGF), epidermal growth factor (EGF), angiogenin, can induce the division of cultured endothelial cells thus indicating a direct action on these cells.
However, other factors have virtually no effect on the division of cultured endothelial cells or, in the case of TGF-beta and TNF-alpha, paradoxically inhibit their growth indicating that their angiogenic action is indirect.

Angioworld

A liquid cartilage extract as an adjuvant to conventional cancer treatment

Dominique R. Garrel, (MD, CSPQ), 2005

A New Perspective on Cancer

The way we think of a disease has profound implications in terms of its treatment. The concept of cancer as a monolithic terminal illness raised the hope of “winning the war on cancer”. This idea has led to the development of successive generations of weapons used at their maxi- mum tolerated dose. While the strategy appears useful in prolonging survival, complete remission remains a rare event. This is because even if only one single enemy is spared, it can still raise an army of new, now resistant, cancer cells that can strike again in a fatal breaking wave.

As the long hoped for idea of a universal cure for cancer fades away, a new vision of multidisciplinary complemen- tary approaches emerges and opens the door to mixed protocols that combine alternative therapies with more conventional cancer treatments.