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Klocke B, Britzolaki A, Saurine J, Ott H, Krone K, Bahamonde K, Thelen C, Tzimas C, Sanoudou D, Kranias EG, Pitychoutis PM. A novel role for phospholamban in the thalamic reticular nucleus. Sci Rep 2024; 14:6376. [PMID: 38493225 PMCID: PMC10944534 DOI: 10.1038/s41598-024-56447-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Accepted: 03/06/2024] [Indexed: 03/18/2024] Open
Abstract
The thalamic reticular nucleus (TRN) is a brain region that influences vital neurobehavioral processes, including executive functioning and the generation of sleep rhythms. TRN dysfunction underlies hyperactivity, attention deficits, and sleep disturbances observed across various neurodevelopmental disorders. A specialized sarco-endoplasmic reticulum calcium (Ca2+) ATPase 2 (SERCA2)-dependent Ca2+ signaling network operates in the dendrites of TRN neurons to regulate their bursting activity. Phospholamban (PLN) is a prominent regulator of SERCA2 with an established role in myocardial Ca2+-cycling. Our findings suggest that the role of PLN extends beyond the cardiovascular system to impact brain function. Specifically, we found PLN to be expressed in TRN neurons of the adult mouse brain, and utilized global constitutive and innovative conditional genetic knockout mouse models in concert with electroencephalography (EEG)-based somnography and the 5-choice serial reaction time task (5-CSRTT) to investigate the role of PLN in sleep and executive functioning, two complex behaviors that map onto thalamic reticular circuits. The results of the present study indicate that perturbed PLN function in the TRN results in aberrant TRN-dependent phenotypes in mice (i.e., hyperactivity, impulsivity and sleep deficits) and support a novel role for PLN as a critical regulator of SERCA2 in the TRN neurocircuitry.
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Affiliation(s)
- Benjamin Klocke
- Department of Biology, University of Dayton, 300 College Park, Dayton, OH, 45469-2320, USA
| | - Aikaterini Britzolaki
- Department of Biology, University of Dayton, 300 College Park, Dayton, OH, 45469-2320, USA
| | - Joseph Saurine
- Department of Biology, University of Dayton, 300 College Park, Dayton, OH, 45469-2320, USA
| | - Hayden Ott
- Department of Biology, University of Dayton, 300 College Park, Dayton, OH, 45469-2320, USA
| | - Kylie Krone
- Department of Biology, University of Dayton, 300 College Park, Dayton, OH, 45469-2320, USA
| | - Kiara Bahamonde
- Department of Biology, University of Dayton, 300 College Park, Dayton, OH, 45469-2320, USA
| | - Connor Thelen
- Department of Biology, University of Dayton, 300 College Park, Dayton, OH, 45469-2320, USA
| | - Christos Tzimas
- Molecular Biology Department, Biomedical Research Foundation of the Academy of Athens, 11527, Athens, Greece
| | - Despina Sanoudou
- Molecular Biology Department, Biomedical Research Foundation of the Academy of Athens, 11527, Athens, Greece
- 4th Department of Internal Medicine, Clinical Genomics and Pharmacogenomics Unit, Medical School, "Attikon" Hospital, National and Kapodistrian University of Athens, 11527, Athens, Greece
| | - Evangelia G Kranias
- Molecular Biology Department, Biomedical Research Foundation of the Academy of Athens, 11527, Athens, Greece
- Department of Pharmacology and Systems Physiology, University of Cincinnati College of Medicine, Cincinnati, OH, 45267, USA
| | - Pothitos M Pitychoutis
- Department of Biology, University of Dayton, 300 College Park, Dayton, OH, 45469-2320, USA.
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Klocke B, Britzolaki A, Saurine J, Ott H, Krone K, Bahamonde K, Thelen C, Tzimas C, Sanoudou D, Kranias EG, Pitychoutis PM. A Novel Role for Phospholamban in the Thalamic Reticular Nucleus. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.11.22.568306. [PMID: 38045420 PMCID: PMC10690257 DOI: 10.1101/2023.11.22.568306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
The thalamic reticular nucleus (TRN) is a critical brain region that greatly influences vital neurobehavioral processes, including executive functioning and the generation of sleep rhythms. Recently, TRN dysfunction was suggested to underlie hyperactivity, attention deficits, and sleep disturbances observed across various devastating neurodevelopmental disorders, including autism, schizophrenia and attention-deficit/hyperactivity disorder (ADHD). Notably, a highly specialized sarco- endoplasmic reticulum calcium (Ca 2+ ) ATPase 2 (SERCA2)-dependent Ca 2+ signaling network operates in the dendrites of TRN neurons to regulate their high-frequency bursting activity. Phospholamban (PLN) is a prominent regulator of the SERCA2 with an established role in maintaining Ca 2+ homeostasis in the heart; although the interaction of PLN with SERCA2 has been largely regarded as cardiac-specific, our findings challenge this view and suggest that the role of PLN extends beyond the cardiovascular system to impact brain function. Specifically, we found PLN to be expressed in the TRN neurons of the adult mouse brain and utilized global constitutive and innovative conditional genetic mouse models, in combination with 5-choice serial reaction time task (5-CSRTT) and electroencephalography (EEG)-based somnography to assess the role of PLN in regulating executive functioning and sleep, two complex behaviors that map onto thalamic reticular circuits. Overall, the results of the present study show that perturbed PLN function in the TRN results in aberrant thalamic reticular behavioral phenotypes in mice (i.e., hyperactivity, impulsivity and sleep deficits) and support a novel role for PLN as a critical regulator of the SERCA2 in the thalamic reticular neurocircuitry.
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