Obviously senescent cells and cells delivered senescent by VEGFR 2 TKIs had reduced VEGFR 2 and CXCR 4 expression and demonstrated reduced migratory ability to VEGF. This study shows apoptosis upon short term inhibition and inhibition of long term survival of OECs from patients with nvAMD by SU5416, presumably via PI3K/Akt and/or PKC mediated decrease in telomerase activity and subsequent induction of premature senescence, that will be accompanied by impaired endothelial activity. Thus, induction of premature senescence in endothelial cells may represent a potential therapeutic target in nvAMD. Age related macular degeneration is the leading cause of irreversible visual impairment and blindness in the older citizenry of the developed world. Until recently, it was assumed that cytokines, including vascular endothelial growth factor, promote growth and formation of choroidal neovascularization, the anatomic correlate of the neovascular type of AMD, by creating preexisting choroidal endothelial cells to develop. But, VEGF may also mobilize endothelial progenitor cells from the bone marrow and support differentiation Mitochondrion of the EPCs into mature endothelial cells at sites of neovascularization. In animal models of nvAMD, many studies now show that a considerable fraction of vascular cells playing CNV are derived from the bone marrow. Clinical evidence for a part of EPCs in the development of CNV originates from the identification of the EPC marker CD133 in specimens of surgically excised CNV, detection of an increased number of circulating CD34 hematopoietic cells in patients with nvAMD, and our very own findings of a somewhat increased number of late outgrowth endothelial progenitor cells in the peripheral blood of patients with nvAMD. Service by VEGF of its receptor VEGF receptor 2 encourages survival and proliferation of endothelial cells via the phosphatidylinositol 3 kinase /protein kinase B and protein kinase C signal transduction pathways. Our recent investigations show that OECs positively correlates ALK inhibitor with VEGFR 2 expression and that their proliferation potential exhibit high expression of VEGFR 2. Endothelial cells, like most normal somatic cells, manifest a restricted growth potential, and when this potential is exhausted, cells enter a physiologic approach termed replicative senescence. Mechanistically, repeated cell division is associated with progressive shortening of telomeres, and synthesis of telomeres requires a reverse transcriptase called telomerase. Though somatic cells were thought to rarely get telomerase activity, endothelial cells stimulated to proliferate in vitro show marked upregulation of telomerase activity, regulated by other growth factors and VEGF, via their intracellular effectors Akt and PI3K.