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Volume 16, Number 19,
Issue of October 1, 1996
pp. 5961-5966
Copyright ©1996 Society for Neuroscience
p53-Independent Cyclin G Expression in a Group of Mature Neurons
and Its Enhanced Expression during Nerve Regeneration
Received May 6, 1996; revised July 8, 1996; accepted July 10, 1996.
Naonori Morita,
Sumiko Kiryu, and
and Hiroshi Kiyama
Department of Neuroanatomy, Biomedical Research Center, Osaka
University Medical School, Osaka 565, Japan
An increase in cyclin G expression after nerve injury was
demonstrated by differential display PCR, carried out to compare
differences in expression of mRNAs between axotomized and normal
hypoglossal motoneurons in the rat. The nerve injury dramatically
upregulated the expression of cyclin G mRNA in the motoneurons during
the early phase of the nerve regeneration process, suggesting an
involvement of cyclin G in the early stage of nerve regeneration. In
brain, in situ hybridization studies also demonstrated
cyclin G expression in a restricted group of matured neurons,
particularly in the telencephalon and the thalamus. This constitutive
expression in mature neurons suggests that cyclin G may have a function
different from other members of the cyclin group. In addition, although
cyclin G has been shown to be a transcription target of p53, the
upregulation of cyclin G in injured motoneurons, as well as the
expression in the adult rat brain, was not affected in the
p53-deficient mouse. These data suggest that the expression of cyclin
G, at least in the nervous system, is not regulated by p53
predominantly, and that there may be alternative regulatory factors or
pathways for cyclin G expression.
Key words:
tumor suppressor;
cyclin G;
nerve injury;
differential
display;
PCR;
hypoglossal nerve
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