Apoptotic versus necrotic characteristics of retinal ganglion cell death after partial optic nerve injury.

Abstract:

:We have investigated time course and characteristics of retinal ganglion cell (RGC) death after partial optic nerve injury. In situ end labeling of DNA fragments with the terminal deoxynucleotidyl transferase (TdT)-mediated deoxyuridine (dUTP)-biotin nick end labeling (TUNEL) method revealed the presence of apoptotic cells on as early as 5 days postcrush with a very high number of TUNEL-positive cells 1 week postinjury. At the ultrastructural level, features of apoptosis were clearly present in the ganglion cell layer at this time point. Moreover, TUNEL-positive cells could be identified as retinal ganglion cells by retrograde labeling with fluorogold. In addition, DNA laddering characteristic for apoptosis was found 1 week postinjury. A considerable number of TUNEL-labeled cells was still found after 2 weeks postinjury. Retinal whole mounts prepared at postlesion days 2-5, however, revealed that many cell bodies with ruptured membranes as evidenced by nucleosomal Sytox staining were present. These cells were also identified as retinal ganglion cells by retrograde labeling with fluorogold. Moreover, at this early stages of RGC degeneration necrotic cellular profiles could be detected by electron microscopic analysis. Thus, evidence is provided that necrosis and apoptosis follow a distinctly different time course after partial optic nerve injury.

journal_name

J Neurotrauma

journal_title

Journal of neurotrauma

authors

Bien A,Seidenbecher CI,Böckers TM,Sabel BA,Kreutz MR

doi

10.1089/neu.1999.16.153

subject

Has Abstract

pub_date

1999-02-01 00:00:00

pages

153-63

issue

2

eissn

0897-7151

issn

1557-9042

journal_volume

16

pub_type

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