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TRH regulates action potential shape in cerebral cortex pyramidal neurons.
Víctor Rodríguez-Molina1, Javier Patiño2, Yamili Vargas3
1Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México (UNAM), AP 70250, México, D.F. 04510, México; Facultad de Medicina, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, México.
Brain Research
|May 21, 2014
Summary
Thyrotropin releasing hormone (TRH) alters action potential shape in cortical neurons. This neuropeptide
Area of Science:
- Neuroscience
- Electrophysiology
- Molecular Biology
Background:
- Thyrotropin releasing hormone (TRH) is a neuropeptide influencing neuronal function.
- TRH modulates electrophysiological properties like membrane potential and firing rates.
Purpose of the Study:
- To investigate the effect of TRH on action potential shape in sensorimotor cortex pyramidal neurons.
- To determine how TRH concentration, time, and cortical layer influence these effects.
- To explore the role of G-protein signaling and TRH-degrading enzyme PPII.
Main Methods:
- Whole-cell patch clamp recordings from pyramidal neurons.
- Application of varying TRH concentrations (0.5, 1, 5µM).
- Pharmacological inhibition of G-protein activity and PPII enzyme activity.
Main Results:
- TRH reduced spike and afterhyperpolarization amplitudes, and increased spike half-width.
- Effects were dose-, time-, and layer-dependent, with significant responses in layers III, V, and VI.
- G-protein inhibition blocked TRH effects; PPII inhibition mimicked TRH's action on spike half-width.
Conclusions:
- TRH significantly regulates action potential shape in cortical pyramidal neurons.
- TRH's action is modulated by G-protein pathways and the PPII enzyme.
- These findings support a model where PPII controls TRH's functional impact in the cortex.