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http://dx.doi.org/10.1007/s12264-021-00788-4DOI Listing

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Astrocytes are multi-functional glial cells in the central nervous system that play critical roles in modulation of metabolism, extracellular ion and neurotransmitter levels, and synaptic plasticity. Astrocyte-derived signaling molecules mediate many of these modulatory functions of astrocytes, including vesicular release of ATP. In the present study, we used a unique genetic mouse model to investigate the functional significance of astrocytic exocytosis of ATP.

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Social hierarchy is established as an outcome of individual social behaviors, such as dominance behavior during long-term interactions with others. Astrocytes are implicated in optimizing the balance between excitatory and inhibitory (E/I) neuronal activity, which may influence social behavior. However, the contribution of astrocytes in the prefrontal cortex to dominance behavior is unclear.

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Ginsenoside Rb1 inhibits astrocyte activation and promotes transfer of astrocytic mitochondria to neurons against ischemic stroke.

Redox Biol

August 2022

State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, Jiangsu, 211198, China; Clinical Metabolomics Center, China Pharmaceutical University, Nanjing, Jiangsu, 211198, China. Electronic address:

Astrocytes activation in response to stroke results in altered mitochondrial exchange with neurons. Ginsenoside Rb1is a major ginsenoside of Panax ginseng particularly known for its neuroprotective potential. This work aimed to investigate if Rb1 could rescue neurons from ischemic insult via astrocyte inactivation and mitochondrial transfer.

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Although ATP and/or adenosine derived from astrocytes are known to regulate sleep, the precise mechanisms underlying the somnogenic effects of ATP and adenosine remain unclear. We selectively expressed channelrhodopsin-2 (ChR2), a light-sensitive ion channel, in astrocytes within the ventrolateral preoptic nucleus (VLPO), which is an essential brain nucleus involved in sleep promotion. We then examined the effects of photostimulation of astrocytic ChR2 on neuronal excitability using whole-cell patch-clamp recordings in two functionally distinct types of VLPO neurons: sleep-promoting GABAergic projection neurons and non-sleep-promoting local GABAergic neurons.

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Article Synopsis
  • Neuronal activity relies on energy sources like glucose and lactate, with lactate being provided by astrocytes, but understanding how inflammation affects this process in neurons remains unclear.
  • Researchers simulated chronic low-grade inflammation by activating microglia and observed that while inflammation decreased lactate in neurons and increased it in astrocytes in isolated cultures, co-cultured systems showed the opposite effect.
  • The study suggests that chronic inflammation enhances lactate supply to neurons via an astrocyte-neuron lactate shuttle but hinders the neurons' ability to use lactate effectively, impacting energy production and neuronal structure.
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