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When the party is over: depressive-like states in rats following termination of cortical D1 receptor overexpression

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Abstract

Rationale

Increased activity of prefrontal D1 dopamine receptors (D1R) is involved in reward-related behavior found in bipolar disorder and drug addiction. While the effects of elevated D1R are known, depressive-like behaviors also occur in these disorders after reward-seeking ends.

Objectives

The goal is to characterize how termination of D1R overexpression influences depressive-like behaviors.

Methods

An inducible (Tet.On), lentiviral vector was used to manipulate the expression of the DRD1 gene in glutamate neurons within the prefrontal cortex in male, adult rats. Sexual activity and sucrose preference were studied in both D1R elevated ON and relatively reduced OFF states. Following termination of the D1R ON state, depressive-like behavior was determined in the OFF state. Expression of the transcriptional regulator, cyclic AMP-responsive element-binding protein (CREB), was used as an indication of downstream effects in the nucleus accumbens (NA).

Results

ON D1R expression increased sexual activity that returned to baseline in the OFF state. Sucrose preferences increased ~6 % in ON state but fell 11 % below control levels when OFF. Consistent with a depressive-like phenotype, D1R OFF decreased activity by 40 %, impaired the ability to control (43 %) and motivation to escape shock (27 % more impaired) relative to dsRed OFF. CREB increased 29 % in the NA in the D1R OFF state relative to the ON state.

Conclusions

This novel approach demonstrates that elevated D1R expression increased hedonic behavior, whereas the termination of D1R overexpression often resulted in depressive-like behavior. These observations support a role for D1R expression cycling in bipolar-associated behaviors and addiction.

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Acknowledgments

We want to thank the Leopoldina Fellowship Program LPDS-40, the NARSAD Young Investigator Grant 2012, the van Ameringen Foundation (to NF), DA-026485 and DA-015403 and the Simches Family (to SLA) for support, Dr. David Sibley (NIH) for providing the D1 receptor plasmid, Dr. Karl Deisseroth (Stanford University) for the CamKIIα promotor, Heather Brenhouse for her help with conducting the experiments and Nellie Mary for helpful discussions.

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Correspondence to Nadja Freund.

Ethics declarations

The experiments were conducted in accordance with the principles of animal care as set forth in the Guide for the Care and Use of Laboratory Animals (NIH), and were approved by the Institutional Animal Care and Use Committee at McLean Hospital.

Financial disclosure

The authors declare that they have no competing financial interests.

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Freund, N., Thompson, B.S., Sonntag, K. et al. When the party is over: depressive-like states in rats following termination of cortical D1 receptor overexpression. Psychopharmacology 233, 1191–1201 (2016). https://doi.org/10.1007/s00213-015-4200-y

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  • DOI: https://doi.org/10.1007/s00213-015-4200-y

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