A Novel Role for Phospholamban in the Thalamic Reticular Nucleus

Area of Science:

• Neuroscience
• Molecular Biology
• Neuropharmacology

Background:

• The thalamic reticular nucleus (TRN) is crucial for executive functions and sleep regulation.
• Dysfunction in TRN is linked to neurodevelopmental disorders like autism, schizophrenia, and ADHD.
• A specific calcium (Ca2+) signaling network involving sarco-endoplasmic reticulum Ca2+ ATPase 2 (SERCA2) operates in TRN neurons.

Approach:

• Investigated the role of phospholamban (PLN), a known SERCA2 regulator, in the brain.
• Utilized genetic mouse models (global constitutive and conditional) for PLN manipulation.
• Assessed behavioral and sleep phenotypes using the 5-choice serial reaction time task (5-CSRTT) and electroencephalography (EEG)-based somnography.

Key Points:

• PLN is expressed in TRN neurons of the adult mouse brain.
• Perturbed PLN function in the TRN leads to hyperactivity, impulsivity, and sleep deficits in mice.
• Findings challenge the cardiac-specific view of PLN-SERCA2 interaction, highlighting its role in brain function.

Conclusions:

• PLN plays a critical role in regulating SERCA2 within the thalamic reticular neurocircuitry.
• PLN dysfunction in the TRN contributes to aberrant behavioral phenotypes relevant to neurodevelopmental disorders.
• This study establishes a novel role for PLN in brain function beyond the cardiovascular system.