Title:Long-Term Effects of Hypoxia-Reoxygenation on Thioredoxins in Rat Central Nervous System
Volume: 25
Issue: 45
Author(s): Matilde Otero-Losada, Canepa L, Lucas Udovin, Tamara Kobiec, Nicolás Toro-Urrego, Kölliker-Frers Rodolfo A. and Francisco Capani*
Affiliation:
- Institute of Cardiological Research, University of Buenos Aires, National Research Council, ININCA.UBA-CONICET, Buenos Aires,Argentina
Keywords:
Common carotid artery occlusion, thioredoxin family, CNS, hypoxia-ischemia.
Abstract: Background: Oxidative stress induced by the oxidative pathway dysregulation following ischemia/
reperfusion has been proposed as an important cause of neuronal death and brain damage. The proteins of the
thioredoxin (Trx) family are crucial mediators of protein function regulating the intracellular hydrogen peroxide
levels and redox-sensitive post-translational protein changes.
Aim: To analyze the expression and distribution of fourteen members of the Trx family, potentially essential for
the regeneration upon long-term brain damage, in a perinatal hypoxia-ischemia rat model induced by common
carotid artery ligation.
Methods: The right common carotid artery (CCA) was exposed by an incision on the right side of the neck, isolated
from nerve and vein, and permanently ligated. Sham-surgery rats underwent right CCA surgical exposure
but no ligation. Euthanasia was administered to all rats at 30, 60, and 90 days of age. Protein expression and distribution
of fourteen members of the Trx family and related proteins (Grx1, Grx2, Grx3, Grx5, Prx1, Prx2, Prx3,
Prx4, Prx5, Prx6, Trx1, Trx2, TrxR1, TrxR2) was examined in the most hypoxia susceptible rat brain areas,
namely, cerebellum, corpus striatum, and the hippocampus.
Results: The thioredoxin proteins displayed a complex, cell-type, and tissue-specific expression pattern following
ischemia/reperfusion. Even 60 days after ischemia/reperfusion, Western blot analysis showed a persistent expression
of Trx1 and Grx2 in several brain areas.
Conclusion: The Trx family of proteins might contribute to long-term survival and recovery supporting their
therapeutic use to curtail ischemic brain oxidative damage following an ischemia/reperfusion insult. Characterization
of ischemia/reperfusion oxidative brain damage and analysis of the involved mechanisms are required to
understand the underneath processes triggered by ischemia/reperfusion and to what extent and in what way thioredoxins
contribute to recovery from brain hypoxic stress.
