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Behavioral effects of the selective blockade of metabotropic glutamate receptor subtype 5 in experimental hypoxia
Agnieszka Nadlewska1, Halina Car, Róza J Wiśniewska
1Department of Pharmacology, Medical Academy, Białystok, Poland.
Abstract:
The behavioral activity of 2-methyl-6-(phenylethynyl)-pyridine (MPEP), a selective antagonist of metabotropic glutamate receptor subtype 5 (mGluR5), was assesed in control groups of rats and in rats that underwent short-term hypoxia. MPEP applied intravenously (iv) at the dose of 1 mg/kg was tested using the open field test, the passive avoidance test and the elevated "plus" maze test. MPEP significantly increased the number of crossings, rearings and bar approaches in the open field test. It improved the consolidation and retrieval in the passive avoidance situation and did not produce any significant effects in control rats in the elevated "plus" maze test. Hypoxia (2% O2, 98% N2) significantly inhibited locomotor and exploratory activity of rats and also impaired consolidation and retrieval processes, but it did not evoke any changes in the elevated "plus" maze test. MPEP in hypoxia-exposed groups of rats inhibited locomotor and exploratory activity in comparison with MPEP-treated control group. Hypoxia significantly diminished beneficial effect of MPEP on consolidation. In spite of experimental conditions of hypoxia, the effect of MPEP on retrieval was preserved. MPEP used before hypoxia did not significantly influence all parameters of the elevated "plus" maze test. In conclusion, MPEP had beneficial effect on retrieval in hypoxia.
Insights
2-methyl-6-(phenylethynyl)-pyridine (MPEP), an mGluR5 antagonist, improved memory retrieval in rats even under hypoxic conditions. However, MPEP
Area of Science:
- Neuroscience
- Pharmacology
Background:
- Metabotropic glutamate receptor subtype 5 (mGluR5) plays a role in synaptic plasticity and cognitive functions.
- Hypoxia can impair cognitive processes, including memory consolidation and retrieval.
- 2-methyl-6-(phenylethynyl)-pyridine (MPEP) is a selective antagonist of mGluR5.
Purpose of the Study:
- To investigate the effects of MPEP on behavioral activity in rats under normal and hypoxic conditions.
- To assess MPEP's impact on memory consolidation and retrieval following short-term hypoxia.
- To evaluate MPEP's influence on locomotor and exploratory behaviors.
Main Methods:
- Rats were divided into control and hypoxia groups.
- MPEP (1 mg/kg, intravenously) was administered.
- Behavioral tests included the open field test, passive avoidance test, and elevated plus maze test.
- Hypoxia was induced using 2% O2 and 98% N2.
Main Results:
- MPEP increased locomotor and exploratory activity in control rats.
- Hypoxia impaired locomotor activity, exploration, and memory consolidation/retrieval.
- In hypoxia-exposed rats, MPEP reduced locomotor activity compared to controls.
- MPEP partially preserved memory retrieval under hypoxia, but diminished consolidation benefits.
- MPEP did not significantly affect performance in the elevated plus maze test under either condition.
Conclusions:
- MPEP demonstrates a beneficial effect on memory retrieval in rats, even when exposed to hypoxia.
- Hypoxia significantly counteracts some of MPEP's positive effects on cognitive functions, particularly consolidation.
- MPEP's impact on retrieval remains notable despite hypoxic stress, suggesting potential therapeutic relevance.
