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Neurobiol Aging. 2016 May;41:73-85. doi: 10.1016/j.neurobiolaging.2016.02.007. Epub 2016 Feb 16.

Role of DHA in aging-related changes in mouse brain synaptic plasma membrane proteome.

Author information

1
Laboratory of Molecular Signaling, DICBR, NIAAA, NIH, Bethesda, MD, USA.
2
Laboratory of Molecular Signaling, DICBR, NIAAA, NIH, Bethesda, MD, USA. Electronic address: hykim@nih.gov.

Abstract

Aging has been related to diminished cognitive function, which could be a result of ineffective synaptic function. We have previously shown that synaptic plasma membrane proteins supporting synaptic integrity and neurotransmission were downregulated in docosahexaenoic acid (DHA)-deprived brains, suggesting an important role of DHA in synaptic function. In this study, we demonstrate aging-induced synaptic proteome changes and DHA-dependent mitigation of such changes using mass spectrometry-based protein quantitation combined with western blot or messenger RNA analysis. We found significant reduction of 15 synaptic plasma membrane proteins in aging brains including fodrin-α, synaptopodin, postsynaptic density protein 95, synaptic vesicle glycoprotein 2B, synaptosomal-associated protein 25, synaptosomal-associated protein-α, N-methyl-D-aspartate receptor subunit epsilon-2 precursor, AMPA2, AP2, VGluT1, munc18-1, dynamin-1, vesicle-associated membrane protein 2, rab3A, and EAAT1, most of which are involved in synaptic transmission. Notably, the first 9 proteins were further reduced when brain DHA was depleted by diet, indicating that DHA plays an important role in sustaining these synaptic proteins downregulated during aging. Reduction of 2 of these proteins was reversed by raising the brain DHA level by supplementing aged animals with an omega-3 fatty acid sufficient diet for 2 months. The recognition memory compromised in DHA-depleted animals was also improved. Our results suggest a potential role of DHA in alleviating aging-associated cognitive decline by offsetting the loss of neurotransmission-regulating synaptic proteins involved in synaptic function.

KEYWORDS:

Aging-related changes; DHA; MS–based protein quantitation; Mass spectrometry; Neurotransmission; Recognition memory; Synaptic plasma membrane proteins

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