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Alkalinization during re-oxygenation prevents functional damage by hyperglycaemic hypoxia
I Euchner-Wamser1, P Grafe, E Sennefelder
1Department of Physiology, University of Munich, Germany.
Neuroreport
|August 15, 1994
Summary
High blood sugar (hyperglycaemia) hinders recovery after temporary brain ischemia. This study shows that preventing cell acidification during re-oxygenation significantly improves neurophysiological function after hyperglycaemic hypoxia.
Area of Science:
- Neuroscience
- Physiology
- Biochemistry
Background:
- Hyperglycaemia is known to worsen outcomes following transient cerebral ischemia.
- The precise role of tissue acidification in this phenomenon remains unclear.
- Understanding this mechanism is crucial for developing effective therapeutic strategies.
Purpose of the Study:
- To investigate the role of tissue acidification in impaired neurophysiological recovery during hyperglycaemic hypoxia.
- To determine the effects of altering cytoplasmic pH on recovery in an in vitro model.
Main Methods:
- Isolated rat dorsal spinal roots were subjected to 30 minutes of hyperglycaemic hypoxia.
- Compound action potentials were measured during re-oxygenation with varying bicarbonate concentrations.
- The effects of weak base (trimethylamine) and weak acid (propionate) on recovery were assessed.
Main Results:
- Minimal recovery of compound action potentials was observed in 5 mM bicarbonate.
- Addition of trimethylamine during re-oxygenation significantly improved recovery.
- Propionate had no beneficial effect on recovery.
- Cytoplasmic alkalinization only improved recovery within a narrow time window.
Conclusions:
- Cytoplasmic acidification plays a critical role in the impaired neurophysiological recovery from hyperglycaemic hypoxia.
- Interventions targeting cytoplasmic pH, particularly alkalinization, may be beneficial during the early stages of re-oxygenation.
- These findings highlight the importance of managing acid-base balance in ischemic conditions.