Effects of insulin and amyloid β1–42 oligomers on glucose incorporation and mitochondrial function in cultured rat hippocampal neurons
Y Miichi, T Sakurai, T Akisaki… - Geriatrics & gerontology …, 2011 - Wiley Online Library
Y Miichi, T Sakurai, T Akisaki, K Yokono
Geriatrics & gerontology international, 2011•Wiley Online LibraryAim: The molecular basis for impaired glucose metabolism in patients with Alzheimer's
disease (AD) has not been fully clarified. We tested whether insulin and amyloid (A) β1–42
oligomers would regulate glucose metabolism and energy homeostasis directly in cultured
rat hippocampal neurons and evaluated possible interactions between insulin signaling and
Aβ1–42 oligomers. Methods: Dissociated hippocampal neurons were prepared from Wistar
rat embryos at day 21 of gestation and cultured for 14 days. Cultured neurons were exposed …
disease (AD) has not been fully clarified. We tested whether insulin and amyloid (A) β1–42
oligomers would regulate glucose metabolism and energy homeostasis directly in cultured
rat hippocampal neurons and evaluated possible interactions between insulin signaling and
Aβ1–42 oligomers. Methods: Dissociated hippocampal neurons were prepared from Wistar
rat embryos at day 21 of gestation and cultured for 14 days. Cultured neurons were exposed …
Aim: The molecular basis for impaired glucose metabolism in patients with Alzheimer's disease (AD) has not been fully clarified. We tested whether insulin and amyloid (A)β1–42 oligomers would regulate glucose metabolism and energy homeostasis directly in cultured rat hippocampal neurons and evaluated possible interactions between insulin signaling and Aβ1–42 oligomers.
Methods: Dissociated hippocampal neurons were prepared from Wistar rat embryos at day 21 of gestation and cultured for 14 days. Cultured neurons were exposed to insulin (1 µM) for 30 min, and Aβ1–42 oligomers (1 µM) were added to culture media for 10–30 min. The glucose uptake of cultured neurons was measured by enzymatic fluorescence assay using 2‐deoxy‐d‐glucose (2DG), and adenosine triphosphate (ATP) contents were quantified using a luciferin/luciferase luminescence assay.
Results: Aβ1–42 oligomers did not suppress 2DG uptake, reflecting the activities of glucose transporters and/or hexokinase, but led to disrupted ATP contents in the presence and absence of monocarboxylates (lactate/pyruvate). Insulin and C‐peptide did not change glucose uptake or ATP concentrations.
Conclusion: The primary target of Aβ1–42 oligomers might be mitochondria, which could explain the reduced cerebral glucose levels in patients with AD. Moreover, insulin signaling was not directly linked to glucose metabolism or energy homeostasis in cultured rat hippocampal neurons. Geriatr Gerontol Int 2011; 11: 517–524.
Wiley Online Library