This is consistent with their known role in myogenesis, since there is constant muscle degeneration and regeneration in dystrophic muscle, which requires the upregulation of these miRNAs to direct appropriate myogenic differentiation.
In fact, the gene expression of NCs and CLCs showed substantial overlap, and Brachyury expression remained constant during IVD degeneration when NCs were replaced by CLCs [ 58, 76].
The hair follicle, as part of the protective and self-renewing mammalian epidermis, is one of the few organs that undergoes constant cycles of degeneration and regeneration throughout life.
The number of mesonephric arteries is not constant, and it follows the degeneration of the mesonephros with the progressive craniocaudal development of the embryo.
In support of this view, one study has suggested that the probability of degeneration may be constant in HD [10].
Although the total number of quiescent SCs decreases with age [7], it remains constant over repeated cycles of degeneration and regeneration thus indicating that the steady-state SCs population is maintained by self-renewal [8], [9], [10], [11].
Inherited models mostly show a slow progression of retinal degeneration resulting in constant but low levels of apoptosis.
Our findings not only support the conclusions of the previous study done with a different mouse model, but also directly show that constant light quite efficiently rescues photoreceptor degeneration when the Ca2+ -insensitive GCAP1 mutant is expressed at the levels similar to that of the wild type GCAP1, whereas constant dark exacerbates the disease.
An early and constant feature of AD is the degeneration of cholinergic neurons in the basal forebrain that innervate the hippocampus and neocortex.
Demyelination of axons reduces the conduction velocity of nerve impulses, but also makes the axons vulnerable to degeneration (Franklin and Ffrench-Constant, 2008).
