This can lead to genomic instability; by increasing tissue proliferation, and inducing tissue remodeling and angiogenesis-promoting factors, as well as inducing extravasation of tumor cells from the microenvironment [ 47].
Alternatively, in the mouse, pigCSF1-Fc treatment greatly increased tissue macrophage numbers, through both local proliferation and monocyte extravasation [ 47].
In contrast, other manipulations that increase Drosophila mitochondrial proliferation, such as increased tissue-general expression of PGC1alpha [ 50] or cyclin D/Cdk4 [ 52] had negative consequences for life span and oxidative stress levels, and taken together these studies indicate that effective interventions in mitochondrial maintenance during aging will require tissue-specific targeting.
Phytoestrogens also have estrogenic effects, however, and may increase breast tissue proliferation [ 12].
The significance of this absence of differential systemic IGF-1 levels or actions (i.e. inducing cellular or histological proliferation, or increasing tissue size), among mice with the RIP::IGF-1 transgene, is that it strongly suggests that the expression and actions of the transgene are either absent or biologically not meaningful outside of the insulin-producing β-cells of the pancreatic islets.
Previous studies have shown that increased strain in early callus leads to greater tissue proliferation and increased callus sizes, as opposed to more rigid immobilization, which leads to an overall smaller fracture callus.
Since then, aberrant over-expression of COX has been consistently associated with malignant transformation of healthy tissue, proliferation and increased invasiveness of malignant tissue, and unfavorable clinical outcomes.
Conversely, CR with a postdevelopmental onset reduces weight by reducing tissue proliferation and increasing the catabolism of adipose depots for energy.
In neoplastic tissues increased cell proliferation frequently outpaces angiogenesis, resulting in tumor cells extending beyond the oxygenation zones that surround blood vessels.
Moreover, such genetic diversity permits exploitation of tissue ecologies through increased proliferation, migration and tissue invasion.
