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Influence of allopurinol on evoked cortical afterdischarges during early ontogenesis
K Jandová1, V Riljak, J Pokorný
1Institute of Physiology, First Faculty of Medicine, Charles University in Prague, Prague, Czech Republic. katerina.jandova@lf1.cuni.cz.
Insights
Repeated allopurinol pre-treatment reduced brain excitability in young rats exposed to hypoxia. This effect was most pronounced in the youngest pups, diminishing with age.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- Long-term hypoxia can alter brain excitability in developing mammals.
- Allopurinol is a xanthine oxidase inhibitor with potential neuroprotective effects.
Purpose of the Study:
- To investigate the effect of allopurinol pre-treatment on brain excitability changes induced by hypoxia in young rats.
- To determine if allopurinol's influence on excitability is age-dependent.
Main Methods:
- Rat pups were exposed to intermittent hypobaric hypoxia from birth.
- Allopurinol was administered daily before hypoxia exposure.
- Brain excitability, measured by afterdischarge duration, was assessed in rats aged 12 to 35 days.
Main Results:
- Hypobaric hypoxia prolonged afterdischarges in rats up to 25 days old.
- Allopurinol significantly shortened afterdischarges in 12-day-old rats.
- The neuroprotective effect of allopurinol was less pronounced in older rats.
Conclusions:
- Allopurinol pre-treatment can modulate hypoxia-induced changes in brain excitability in developing rats.
- The efficacy of allopurinol in mitigating these changes is age-dependent.
- These findings suggest a potential therapeutic window for allopurinol in managing hypoxic brain injury during early development.
Abstract:
The aim of our study was to test the hypothesis, whether repeated allopurinol pre-treatment (in dose of 135 mg/kg s.c.) can influence changes of brain excitability caused by long-term hypoxia exposition in young immature rats. Rat pups were exposed together with their mother in to an intermittent hypobaric hypoxia (simulated altitude of 7 000 m) since the day of birth till the 11th day (youngest experimental group) or 17th day for 8 hours a day. Allopurinol was administered daily immediately before each hypoxia exposition. The duration of evoked afterdischarges (ADs) and the shape of evoked graphoelements were evaluated in 12, 18, 25 and 35-day-old freely moving male pups. Hypobaric hypoxia prolonged the duration of ADs in 12, 18 and 25-day-old rats. The ADs were prolonged in 35-day-old rats only after the first stimulation. Allopurinol shorted the duration of ADs only in 12-day-old pups. In older experimental group the effect of allopurinol treatment was less pronounced.
