They include inhibition of proteases, interference with inflammatory processes, inhibition of integrin signaling, interference with hypoxia processes, and remodeling of ECM 11, 73, 113.
Nevertheless, hyperglycemia damages the endothelial cells and pericytes and increases vascular permeability with rupture of the blood-retinal barrier with the subsequent appearance of the retinal hypoxia processes, which, in turn, induces vascular endothelial growth factor (VEGF) expression, among other proangiogenic effectors [ 14, 15].
The GO analysis showed enrichment of many important biological processes, such as response to hypoxia, developmental process, and regulation of cell proliferation.
In addition to pre-existing tumour hypoxia, the process of PDT itself induces hypoxia, as the generation of reactive oxygen species is an oxygen-consuming process (Foster et al, 1991).
17– 19 In hypoxia, this process is suppressed, resulting in HIF-1α accumulation.
In addition to hypoxia, another process having a role in cancer resistance has been highlighted in these past years, which is autophagy.
However, the relationship between hypoxia, cellular processes and craniofacial morphogenesis was not tested directly.
These data also imply that the abundance of PHD2, rather than oxygen availability, becomes the limiting factor for its activity in macrophages; of note, collateral formation is recognized as a hypoxia-independent process (Gray et al, 2007; Ito et al, 1997a).
Thus, the observation of cellular oxygen levels in any cellular compartment using genetically encoded FRET biosensors will offer a novel rational approach to understand hypoxia-dependent processes in biological, biomedical and biotechnological processes.
