Astrocytic CREB regulates transcriptomic, neuronal, and behavioral responses to cocaine

Area of Science:

• Neuroscience
• Molecular Biology
• Addiction Research

Background:

• Astrocytes are increasingly recognized for their role in neuropsychiatric disorders, including addiction.
• The specific transcriptional changes in astrocytes following cocaine exposure remain largely uncharacterized.

Purpose of the Study:

• To investigate the astrocyte transcriptome in response to cocaine self-administration.
• To identify key molecular regulators and mechanisms underlying astrocyte involvement in cocaine addiction.

Main Methods:

• RNA sequencing of whole-cell sorted astrocytes from the nucleus accumbens in male mice after cocaine self-administration.
• Bioinformatic characterization of astrocyte transcriptional signatures.
• Cleavage under targets and release using nuclease sequencing (CUT&RUN) to assess CREB DNA binding.
• Viral-mediated manipulation of astrocytic CREB activity and assessment of addiction-related behaviors.

Main Results:

• Cocaine self-administration induced robust and context-specific transcriptional changes in astrocytes.
• Adenosine 3',5'-monophosphate response element-binding protein (CREB) was identified as a key cocaine-induced transcriptional regulator in astrocytes.
• Increased astrocytic CREB DNA binding was observed post-cocaine exposure.
• Astrocytic CREB activity enhanced the rewarding and reinforcing effects of cocaine.
• Astrocytic CREB modulated astrocyte calcium dynamics and increased D1-type medium spiny neuronal activity.

Conclusions:

• Astrocytes exhibit significant transcriptional responses to cocaine, mediated by CREB.
• Astrocytic CREB plays a critical role in mediating the rewarding and reinforcing properties of cocaine.
• Modulation of astrocytic CREB represents a potential therapeutic target for cocaine addiction by influencing neuronal activity and reward pathways.