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Differentiation of radial glia cells into astrocytes is a possible ageing
mechanism in mammals
O. G. Boyko
National Agrarian University
ul. Groyev oborony 15, Kiev 03041, Ukraine
e-mail: boyko-l@rambler.ru
Several obscure facts of gerontology are briefly reviewed. The attempt is made to shape new notions of the
pheonomenon based on the astrocyte hypothesis of ageing in mammals. This hypothesis interprets mammal
ageing as a genetic disease with fatal outcome. The disease is caused by single character acquired by the ther-
omorph lineage of the vertebrates in the course of evolution: the transformation of radial glia cells (RGC) into
star-shaped astrocytes during the postnatal development, i.e. the disappearance of the fetal radial ways of nerve
cell migration from proliferative zones to the sites of their ultimate localization in the brain of adult individuals.
This process is the cause for the mammal brain being postmitotic. The disappearance of RGC induces a cascade
of system processes termed age-dependent mechanism of self-destruction of mammals (AMSM). The disap-
pearance of RGC inhibits the replacement of the nerve cells that have exhausted their living resources. Nerve
cells are rigidly specialized and have restricted lifetime and ability of reparation. After some period, the level
of homeostasis in nerve cells starts changing steadily for the worse due to irreversible pathological changes in
the cells (especially in the neurosecretory cells). This brings damage to life-sypport systems of the mammal
organism thus causing its death. The species-specific maximum life span is thus determined by the rate of me-
tabolism in the organism. AMSM probably displays a general evolutionary principle: outer factors causing
death (in non-ageing organisms) are replaced by inner factors.