Abstract
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. Using primary cultured astrocytes, we show that loss of vesicular nucleotide transporter (Vnut), a primary transporter responsible for loading cytosolic ATP into the secretory vesicles, dramatically reduces ATP loading into secretory lysosomes and ATP release, without any change in the molecular machinery of exocytosis or total intracellular ATP content. Deletion of astrocytic Vnut in adult mice leads to increased anxiety, depressive-like behaviors, and decreased motivation for reward, especially in females, without significant impact on food intake, systemic glucose metabolism, cognition, or sociability. These behavioral alterations are associated with significant decreases in the basal extracellular dopamine levels in the nucleus accumbens. Likewise, ex vivo brain slices from these mice show a strong trend toward a reduction in evoked dopamine release in the nucleus accumbens. Mechanistically, the reduced dopamine signaling we observed is likely due to an increased expression of monoamine oxidases. Together, these data demonstrate a key modulatory role of astrocytic exocytosis of ATP in anxiety, depressive-like behavior, and motivation for reward, by regulating the mesolimbic dopamine circuitry.
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The present study does not include any omics data to be deposited to the public repository. All the raw images and raw data will be provided upon request for research purpose only.
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Acknowledgements
This work was supported by NIH grants R01 MH125903 and R03 AG083363 (to W.C.) and the Programs in Pharmacology and Experimental Therapeutics and Pharmacology and Drug Development of the Tufts University Graduate School of Biomedical Sciences (E.N.P.). We thank Dr. Bradford Lowell’s laboratory at BIDMC, Harvard Medical School for the development and sharing of the Vnutf/f mice (P30 DK057521, P30 DK046200, R01 DK075632, R01 DK096010, R01 DK089044, and R01 DK071051, to B.B.L). A.E. is funded by an NIH grant R01 DK122167. The Imaging Center at the New York Institute of Technology provided important support.
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HQ designed the study, performed experiments, and analyzed data. HHL, BV, QZ, CX, BCL, YRA, LL, JSY, JE, CGV, AL, AL, ST, CWW, TL, YH, RLR, RFS, AEO, FJQ, and BBL helped design and performed experiments. CRK and ENP helped design the experiments and provided edits for the manuscript. WC designed the study, supervised all work, and wrote the manuscript.
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Huang, Q., Lee, H.H., Volpe, B. et al. Deletion of murine astrocytic vesicular nucleotide transporter increases anxiety and depressive-like behavior and attenuates motivation for reward. Mol Psychiatry (2024). https://doi.org/10.1038/s41380-024-02692-5
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DOI: https://doi.org/10.1038/s41380-024-02692-5