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Optic nerve alterations in P27(Kip1) knockout mice.

E Lopez-Sanchez1, E Frances-Muñoz, V Chaques

  • 1Hospital Arnau de Vilanova, Valencia, Spain. elopez@comv.es

European Journal of Ophthalmology
|May 31, 2007
PubMed
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P27(Kip1) gene knockout mice exhibit significantly larger optic nerves with altered axon size and density. These findings suggest hypertrophic, hyperplastic, and dystrophic optic nerves in P27(Kip1) knockout models.

Area of Science:

  • Neuroscience
  • Genetics
  • Ophthalmology

Background:

  • The P27(Kip1) gene plays a crucial role in cell cycle regulation, apoptosis, and protein phosphorylation.
  • Understanding its role in optic nerve development and health is essential for neuro-ophthalmological research.

Purpose of the Study:

  • To investigate the morphologic and morphometric characteristics of the optic nerve (ON) in mice lacking the P27(Kip1) gene.
  • To assess the impact of P27(Kip1) gene knockout on optic nerve structure and protein expression.

Main Methods:

  • Utilized morphologic and morphometric techniques, including light and electron transmission microscopy, on optic nerves from P27(Kip1) knockout and wild-type mice.
  • Analyzed glial fibrillary acidic protein (GFAP) and myelin basic protein (MBP) expression using Western blot and immunoblotting.

Related Experiment Videos

Main Results:

  • P27(Kip1) knockout mice showed a significantly larger ON cross-sectional area and larger axon sizes compared to controls (p<0.001).
  • Increased axon numbers, intra-axonal degeneration, and alterations in myelin sheath and axoplasm density were observed in knockout mice (p<0.001).
  • Reduced expression of MBP and GFAP was detected in the optic nerves of P27(Kip1) knockout mice (p<0.005, p<0.01).

Conclusions:

  • Homozygous P27(Kip1) knockout mice present with hypertrophic, hyperplastic, and dystrophic optic nerves.
  • These findings highlight the critical role of P27(Kip1) in regulating optic nerve morphology and cellular integrity.