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Glycogenolysis-Induced Astrocytic Serping1 Expression Regulates Neuroinflammatory Effects on Hippocampal neuron
Masahito Ishiyama1, Hitoshi Gotoh2, Souichi Oe3
1Department of Biology, Kyoto Prefectural University of Medicine, Inamori Building, 1-5 Shimogamo Hanki-Cho, Sakyo-Ku, Kyoto City, 606-0823, Japan.
Molecular Neurobiology
|July 10, 2024
Summary
Lipopolysaccharide (LPS) activates astrocytes via glycogenolysis, a metabolic pathway influencing inflammatory responses and neurotoxicity. This process impacts astrocyte-derived Serping1, affecting neuronal health and potentially contributing to neurological disorders.
Area of Science:
- Neuroscience
- Immunology
- Cellular Metabolism
Background:
- Lipopolysaccharide (LPS) triggers microglial and astrocyte activation, linked to altered synapse formation and increased risk for neurological conditions like seizures and depression.
- The precise mechanisms underlying LPS-induced astrocyte activation and its impact on neuronal health require further investigation.
- Cellular metabolism is increasingly recognized as a key regulator of immune cell activation, providing energy and metabolites.
Purpose of the Study:
- To investigate the role of cellular metabolism in LPS-induced astrocyte activation.
- To elucidate the mechanisms by which LPS affects astrocyte function and neuronal synaptogenesis.
- To identify specific metabolic pathways involved in astrocyte inflammatory responses.
Main Methods:
- Analysis of astrocyte-derived synaptogenic gene expression in the postnatal hippocampus following LPS treatment.
- Investigation of the role of glycogenolysis in regulating inflammatory-responsive genes, including Serping1.
- Assessment of the impact of glycogenolysis activation on neurotoxic astrocyte phenotypes, such as impaired synaptogenesis and cellular toxicity.
- Exploration of the reactive oxygen species (ROS)-NF-κB signaling axis in mediating glycogenolysis-induced gene expression.
Main Results:
- LPS did not alter astrocyte-derived synaptogenic gene expression in the postnatal hippocampus.
- LPS induced the upregulation of astrocytic complement component regulator Serping1 within the postnatal hippocampus.
- Activation of glycogenolysis was identified as a regulatory mechanism for inflammatory-responsive genes like Serping1, mediated by the ROS-NF-κB axis.
- Glycogenolysis was implicated in neurotoxic astrocyte phenotypes, including impaired neuronal synaptogenesis and cellular toxicity.
Conclusions:
- Activation of glycogenolysis in postnatal astrocytes is a critical metabolic pathway for inflammatory responses.
- Glycogenolysis contributes to neurotoxic astrocyte phenotypes, impacting neuronal synaptogenesis and cellular viability.
- Understanding the metabolic regulation of astrocytes by LPS offers insights into neurological disorders and potential therapeutic targets.
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