Impaired brain development and reduced cognitive function in phospholipase D-deficient mice

Area of Science:

• Biochemistry
• Neuroscience
• Molecular Biology

Background:

• Phospholipases D (PLD1 and 2) are enzymes critical for cell signaling.
• They hydrolyze phosphatidylcholine into phosphatidic acid and choline.
• Choline is a precursor for acetylcholine (ACh), a key neurotransmitter.

Purpose of the Study:

• To investigate the role of PLD1 and PLD2 in mouse brain development and cognitive function.
• To examine the impact of PLD deficiency on acetylcholine release in the hippocampus.

Main Methods:

• Generation of mice deficient in PLD1, PLD2, or both.
• Assessment of brain growth during the postpartum period.
• Evaluation of cognitive function using social and object recognition tasks.
• Measurement of hippocampal acetylcholine release via brain microdialysis.

Main Results:

• PLD-deficient mice exhibited reduced brain growth between 14-27 days postpartum.
• Adult PLD-deficient mice showed impaired performance in social and object recognition tasks.
• Wild-type mice displayed a significant increase in hippocampal ACh release upon stimulation, unlike PLD-deficient mice.

Conclusions:

• PLD enzymes are essential for normal brain development and cognitive function.
• PLD deficiency leads to impaired acetylcholine neurotransmission.
• These findings may offer insights into cognitive deficits in conditions like fetal alcohol syndrome and Alzheimer's disease.