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Aging‐associated changes in hippocampal glycogen metabolism in mice. Evidence for and against astrocyte‐to‐neuron lactate shuttle
Author(s) -
DrulisFajdasz Dominika,
Gizak Agnieszka,
Wójtowicz Tomasz,
Wiśniewski Jacek R.,
Rakus Dariusz
Publication year - 2018
Publication title -
glia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.954
H-Index - 164
eISSN - 1098-1136
pISSN - 0894-1491
DOI - 10.1002/glia.23319
Subject(s) - astrocyte , hippocampal formation , glycogen , biology , glycolysis , neuron , metabolism , lactate dehydrogenase , mitochondrion , crosstalk , endocrinology , neuroscience , medicine , microbiology and biotechnology , biochemistry , enzyme , central nervous system , physics , optics
Lactate derived from astrocytic glycogen has been shown to support memory formation in hippocampi of young animals, inhibiting it in old animals. Here we show, using quantitative mass spectrometry‐based proteomics, immunofluorescence, and qPCR that aging is associated with an increase of glycogen metabolism enzymes concentration and shift in their localization from astrocytes to neurons. These changes are accompanied with reorganization of hippocampal energy metabolism which is manifested by elevated capacity of aging neurons to oxidize glucose in glycolysis and mitochondria, and decreased ability for fatty acids utilization. Our observations suggest that astrocyte‐to‐neuron lactate shuttle may operate in young hippocampi, however, during aging neurons become independent on astrocytic lactate and the metabolic crosstalk between the brain's cells is disrupted.