In our studies, low capacity organs (i.e. pancreas, adrenals, intestine and stomach), but not high capacity organs (i.e. tumor), showed elevated uptake with 68Ga-DOTATATE, indicating this to be a peptide mass effect.
The regenerative capacity of organ stem cells is very efficient in embryonic and young organisms, but deteriorates with advancing age, and the cell-extrinsic changes, i.e. the aging of the stem cell niche, play a large role in that age-specific decline.
Thus, future investigation should focus on increasing and restoring wild-type mtDNA to restore cellular oxidative capacity and organ function in sepsis and shock.
A decline in tissue regenerative capacity and organ homeostasis is a major feature of aging that is associated with impaired stem cell function.
Delaying Bodily Decline The first, called physiologic reserve, refers to excess capacity in organs and biological systems; we're given this reserve at birth, and it tends to decrease over time.
If the mitochondrial genome drift results in a significant amount of mutant mtDNA, cells exhibit reduced energy capacity and organs become dysfunctional [ 7].
The bZip transcription factor CrebA upregulates genes encoding the known protein components of the early secretory pathway in the salivary gland (SG) and other high capacity secretory organs (Abrams and Andrew, 2005; Fox et al., 2010).
Together, these examples suggest that even in some salamanders with boundless regenerative abilities, constraints imposed by aging, either at the physiological or cellular level, work to limit regenerative capacity in organ- and species-specific manners.
One of the defining characteristics of the plant kingdom is the exceptional capacity of organs, tissues, and individual cells to de-differentiate and regenerate into complete plants; a phenomenon referred to as totipotency [ 1].
