Methylation can be transient and change rapidly during the life span of a cell or organism, or it can be largely permanent once set early in the development of the embryo.
Other potential variables include the presence of plasma inhibitors, the transient nature of infection, the short life span of infected mononuclear cells, and differences in susceptibility of different mononuclear fractions [ 47].
Methylation can be transient and can change rapidly during the life span of a cell or organism, or it can be essentially permanent once set early in the development of the embryo.
In C. elegans, life span can be increased by transient exposure to stressors, such as heat and hyperoxia, or chronic exposure to low levels of chemical ROS generators [8,10,27 29].
Under the aspect that mitochondrial dysfunction is observed during aging, Kim Zarse (University of Jena) showed in Caenorhabditis elegans that a transient increase in mitochondrial ROS formation can potentiate the life span extension observed when the Insulin/IGF-I signaling pathway is impaired.
This problem can be overcome by transient expression of human telomerase reverse transcriptase (hTERT), which extends MSC life span by preventing telomere shortening.
And even if the life span numbers are spot-on — which some researchers argue is improbable, considering how transient many South Texas immigrants are, and how dire conditions are in the border's colonias — the region's health care providers argue that a long life should not be mistaken for a healthy life.
In summary, transient telomerase expression and only a very small average telomere elongation by hTERT resulted in a 50% increase in life span of human fibroblasts.
"They have a life span," he said.
It seems to have been a strange and transient life (or is "transient life" a tautology?) that I find hard to pin down, but she seems blissfully content.
