Abstract
Schizophrenia is a neuropsychiatric disorder with postulated neurodevelopmental etiology. Genetic and imaging studies have shown enhanced dopamine and D2 receptor occupancy in the striatum of patients with schizophrenia. However, whether alterations in postnatal striatal dopamine can lead to long-lasting changes in brain function and behavior is still unclear. Here, we approximated striatal D2R hyperfunction in mice via designer receptor-mediated activation of inhibitory Gi-protein signaling during a defined postnatal time window. We found that Gi-mediated inhibition of the indirect pathway (IP) during postnatal days 8–15 led to long-lasting decreases in locomotor activity and motivated behavior measured in the adult animal. In vivo photometry further showed that the motivational deficit was associated with an attenuated adaptation of outcome-evoked dopamine levels to changes in effort requirements. These data establish a sensitive time window of D2R-regulated striatal development with long-lasting impacts on neuronal function and behavior.
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Acknowledgements
We thank Vivian Zhou for assistance with immunohistochemistry and Dr. Kyo Iigaya for discussions about economic modeling.
Funding
This work has been supported by K08MH127379 to PO and R01MH093672, R01MH124858 to CK and MH068073 to PB. Additional support also provided by the Leon Levy Foundation Neuroscience Fellowship to PO.
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PO, PB, and CK conceived the experiments, PO, MS, and SM performed all experiments. AH developed MATLAB data analysis scripts. MG performed the economical modeling. RR developed protocol and analyzed striatal cell counting. PO and CK wrote the manuscript with inputs from PB.
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Olivetti, P.R., Torres-Herraez, A., Gallo, M.E. et al. Inhibition of striatal indirect pathway during second postnatal week leads to long-lasting deficits in motivated behavior. Neuropsychopharmacol. 50, 651–661 (2025). https://doi.org/10.1038/s41386-024-01997-x
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DOI: https://doi.org/10.1038/s41386-024-01997-x
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