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Updated: Oct 21, 2025
Experimental Models to Study the Neuroprotection of Acidic Postconditioning Against Cerebral Ischemia
Published on: July 31, 2017
Remote ischemic conditioning improves rat brain antioxidant defense in a time-dependent mechanism
Andrew Moraes Monteiro1, Rodrigo Paracampo Couteiro1, Dora Fonseca da Silva1
1MD. Laboratory for Experimental Surgery - Department of Experimental Surgery - Universidade do Estado do Pará (UEPA) - Belém (PA), Brazil.
Purpose:
To clarify the best protocol for performing remote ischemic conditioning and to minimize the consequences of ischemia and reperfusion syndrome in brain, the present study aimed to evaluate different time protocols and the relation of the organs and the antioxidant effects of this technique.
Methods:
The rat's left femoral artery was clamped with a microvascular clamp in times that ranged from 1 to 5 minutes, according to the corresponding group. After the cycles of remote ischemic conditioning and a reperfusion of 20 minutes, the brain and the left gastrocnemius were collected. The samples were used to measure glutathione peroxidase, glutathione reductase and catalase levels.
Results:
In the gastrocnemius, the 4-minute protocol increased the catalase concentration compared to the 1-minute protocol, but the latter increased both glutathione peroxidase and glutathione reductase compared to the former. On the other hand, the brain demonstrated higher catalase and glutathione peroxidase in 5-minute group, and the 3-minute group reached higher values of glutathione reductase.
Conclusions:
Remote ischemic conditioning increases brain antioxidant capacity in a time-dependent way, while muscle presents higher protection on 1-minute cycles and tends to decrease its defence with longer cycles of intermittent occlusions of the femoral artery.
