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Volume 16, Number 13,
Issue of July 1, 1996
pp. 4186-4194
Copyright ©1996 Society for Neuroscience
Protection of Retinal Ganglion Cells from Natural and
Axotomy-Induced Cell Death in Neonatal Transgenic Mice
Overexpressing bcl-2
Received Jan. 16, 1996; revised April 3, 1996; accepted April 11, 1996.
Lidia Bonfanti1,
Enrica Strettoi1,
Sabrina Chierzi2,
Maria Cristina Cenni1,
Xiu-Huai Liu2,
Jean-Claude Martinou3,
Lamberto Maffei1, 2, and
Sylvia A. Rabacchi1, 2
1 Istituto di Neurofisiologia del Consiglio Nazionale
delle Ricerche, 56127 Pisa, Italy, 2 Scuola Normale
Superiore, 56127 Pisa, Italy, and 3 Glaxo Institute for
Molecular Biology, Geneva, Switzerland
Approximately half of the retinal ganglion cells (RGCs)
present in the rodent retina at birth normally die during early
development. Overexpression of the proto-oncogene bcl-2 recently has
been shown to rescue some neuronal populations from natural cell death
and from degeneration induced by axotomy of nerves within the
peripheral nervous system. Here we study in vivo the role of
the overexpression of bcl-2 in the natural cell death of RGCs and in
the degenerative process induced in these cells by transection of the
optic nerve. We find that in newborn bcl-2 transgenic mice, the number
of RGCs undergoing natural cell death is considerably lower than in
wild-type pups. Consistently, a vast majority (90%) of the ganglion
cells found in the retina of neonatal transgenics are maintained in
adulthood, whereas only 40% survive in wild-type mice.
After transection of the optic nerve, the number of degenerating
ganglion cells, determined by counting pyknotic nuclei or nuclei with
fragmented DNA, is substantially reduced in transgenic mice. In
wild-type animals, almost 50% of ganglion cells degenerate in the 24 hr after the lesion, whereas almost the entire ganglion cell population
survives axotomy in transgenic mice. Therefore, overexpression of bcl-2
is effective in preventing degeneration of this neuronal population,
raising the possibility that ganglion cells are dependent on the
endogenous expression of bcl-2 for survival. The remarkable rescue
capacity of bcl-2 overexpression in these neurons makes it an
interesting model for studying natural cell death and responses to
injury in the CNS.
Key words:
retinal ganglion cells;
optic nerve;
apoptosis;
developmental cell death;
axotomy;
bcl-2
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