Protective effect of taurine on the light-induced disruption of isolated frog rod outer segments
Isolated frog rod outer segments (ROS) incubated in a Krebs-bicarbonate medium, and illuminated for 2 h, show a profound alteration in their structure. This is characterized by distention of discs, vesiculation, and a marked swelling. The light-induced ROS disruption requires the presence of bicarbonate and sodium chloride. Replacement of bicarbonate by TRIS or HEPES protects ROS structure. Also, substitution of sodium chloride by sucrose or choline chloride maintains unaltered the ROS structure. Deletion of calcium, magnesium, or phosphate does not modify the effect produced by illumination. An increased accumulation of labeled bicarbonate and tritiated water is observed in illuminated ROS, as compared with controls in the dark. The presence of taurine, GABA, or glycine, at concentrations of 5-25 mM, effectively counteracts the light-induced ROS disruption. Taurine (25 mM) reduces labeled bicarbonate and tritiated water levels to those observed in the dark incubated ROS.
- Research Organization:
- Centro de Investigaciones en Fisiologia Celular, Departamento de Neurociencias, Universidad Nacional Autonoma de Mexico
- OSTI ID:
- 5584527
- Journal Information:
- J. Neurosci. Res.; (United States), Vol. 6:3
- Country of Publication:
- United States
- Language:
- English
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