May 2008
Volume 49, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2008
Pax2 in a Continuous Growth and Regeneration Model of the Visual System
Author Affiliations & Notes
  • M. Parrilla-Monge
    Cell Biology-INCyL, University of Salamanca, Salamanca, Spain
  • C. Lillo
    Cell Biology-INCyL, University of Salamanca, Salamanca, Spain
  • E. Cid
    Cell Biology-INCyL, University of Salamanca, Salamanca, Spain
  • J. Herrero
    Cell Biology-INCyL, University of Salamanca, Salamanca, Spain
  • J. Lara
    Cell Biology-INCyL, University of Salamanca, Salamanca, Spain
  • J. Aijon
    Cell Biology-INCyL, University of Salamanca, Salamanca, Spain
  • A. Velasco
    Cell Biology-INCyL, University of Salamanca, Salamanca, Spain
  • Footnotes
    Commercial Relationships  M. Parrilla-Monge, None; C. Lillo, None; E. Cid, None; J. Herrero, None; J. Lara, None; J. Aijon, None; A. Velasco, None.
  • Footnotes
    Support  Junta de Castilla y León (SA036A07), Cajas de ahorros confederadas de la JCyL, Red de Terapia Celular de la JCyL.
Investigative Ophthalmology & Visual Science May 2008, Vol.49, 4363. doi:https://doi.org/
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      M. Parrilla-Monge, C. Lillo, E. Cid, J. Herrero, J. Lara, J. Aijon, A. Velasco; Pax2 in a Continuous Growth and Regeneration Model of the Visual System. Invest. Ophthalmol. Vis. Sci. 2008;49(13):4363. doi: https://doi.org/.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
Abstract

Purpose: : Pax2 is a transcription factor involved in axonal guidance and glial differentiation in optic nerve (ON) development. We study the role of Pax2 in the visual system of adult goldfish which is continuously adding new axons and is capable of regenerate and restore vision after a lesion.

Methods: : We used 12 controls and 15 goldfish injured by cryo-lesion of the retina periphery which were sacrificed 2, 7, 15, 30 and 60 days post-injury. Using Western Blot (WB) we checked IgG anti-Pax2 immunospecificity. To analyse the Pax2+ cells, we used electron and optic immunohistochemistry using double labelling with astrocyte (GFAP, GS and S100), dividing cells (PCNA and BrdU) and growing axon (Zn8) markers. The variations in Pax2 expression were studied by PCR.

Results: : We demonstrate by WB the presence of Pax2 in the adult goldfish ON. Pax2+ cells are only situated in the ON. Moreover, they are mostly located in the optic nerve head (ONH), increase their number along the pre-chiasmatic segment and start to decrease from the optic chiasm to the optic tract. By electron microscopy, we found that there were two astrocyte populations in the ON: Pax2+ and Pax2- cells. In the ONH, Pax2+ cells showed a different organization from the rest of the ON. There are astrocytes Pax2+/GFAP+ situated limiting the retina, the vitreous humour and the central artery with the ON. In the optic disc they are closely associated with the vitreal processes of the Müller cells labelled with both GFAP+ and GS+. Some Pax2+ cells can also divide (Pax2+/PCNA+) and others are situated longitudinally to the growing axons (Zn8+) and intimately associated with them. With immunohistochemistry and PCR techniques, we found that Pax2 expression falls in the absence of growing axons.

Conclusions: : The maintenance of Pax2 in the ON, especially in the ONH, could be related to the continuous growth capacity of the visual system of goldfish. Pax2 could take part in both the new arriving axon guidance and packing, and in the continuous new glial cells forming and their correct differentiation.

Keywords: astrocytes: optic nerve head • regeneration • transcription factors 
×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×