[Oxidative damage and photoreceptor cell apoptosis in contusion injury of the rabbit retina].
OBJECTIVE
To study the mechanism of retina injury and photoreceptor apoptosis after contusion as well as their triggering factor.


METHODS
The rabbit retina was injured by a 3 J energy contusion caused by a free falling iron bar hitting the cornea. The morphologic changes of the retina were observed by light and electron microscopes. Terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) technique was used to assess apoptosis. The amount of the malondialdehyde (MDA) and the activity of superoxide dismutase (SOD) in the retina were assayed and analyzed statistically.


RESULTS
Apoptosis of photoreceptors was present in retina contusion caused by a 3 J energy injury. After contusion, the MDA level increased gradually. The activity of SOD increased reflectively at first, then decreased markedly 3 days after the contusion, which was parallel with the appearance of apoptotic photoreceptors.


CONCLUSIONS
Apoptosis is an important mechanism of retina contusion. Free oxygen radicals are the important triggering factors for the apoptosis of photoreceptors in the retina contusion of the rabbits.
An
Mei-xia
MX
Department of Ophthalmology, Zhengzhou Railway Bureau Center Hospital, Zhengzhou 450052, China. xhl75751@sohu.com
Zhang
Xiao-fang
XF
Zhang
Jin-song
JS
D000818:Animals; D017209:Apoptosis; D003288:Contusions / Q000473:pathology*; D005260:Female; D005609:Free Radicals; D008297:Male; D008315:Malondialdehyde / Q000032:analysis; D010084:Oxidation-Reduction; D010100:Oxygen / Q000378:metabolism*; D010786:Photoreceptor Cells / Q000473:pathology*; D011817:Rabbits; D012160:Retina / Q000293:injuries* / Q000378:metabolism / Q000473:pathology
D005609:Free Radicals; D008315:Malondialdehyde; D010100:Oxygen