Intense Activity of the Raphe Spinal Pathway Depresses Motor Activity via a Serotonin Dependent Mechanism
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Intense Activity of the Raphe Spinal Pathway Depresses Motor Activity via a Serotonin Dependent Mechanism. / Perrier, Jean-François; Rasmussen, Hanne B; Jørgensen, Lone K; Berg, Rune W.
In: Frontiers in Neural Circuits, Vol. 11, 111, 2018.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Intense Activity of the Raphe Spinal Pathway Depresses Motor Activity via a Serotonin Dependent Mechanism
AU - Perrier, Jean-François
AU - Rasmussen, Hanne B
AU - Jørgensen, Lone K
AU - Berg, Rune W
PY - 2018
Y1 - 2018
N2 - Motor fatigue occurring during prolonged physical activity has both peripheral and central origins. It was previously demonstrated that the excitability of motoneurons was decreased when a spillover of serotonin could activate extrasynaptic 5-HT1A receptors at the axon initial segment (AIS) of motoneurons. Here we investigated the impact of massive synaptic release of serotonin on motor behavior in an integrated preparation of the adult turtle performing fictive scratching behaviors. We found that a prolonged electrical stimulation of the raphe spinal pathway induced a reversible inhibition of the motor behavior that lasted several tens of seconds. The effect disappeared when the spinal cord was perfused with an antagonist for 5-HT1A receptors. By demonstrating a direct impact of serotonin on motor behavior, we suggest a central role of this monoamine behind central fatigue.
AB - Motor fatigue occurring during prolonged physical activity has both peripheral and central origins. It was previously demonstrated that the excitability of motoneurons was decreased when a spillover of serotonin could activate extrasynaptic 5-HT1A receptors at the axon initial segment (AIS) of motoneurons. Here we investigated the impact of massive synaptic release of serotonin on motor behavior in an integrated preparation of the adult turtle performing fictive scratching behaviors. We found that a prolonged electrical stimulation of the raphe spinal pathway induced a reversible inhibition of the motor behavior that lasted several tens of seconds. The effect disappeared when the spinal cord was perfused with an antagonist for 5-HT1A receptors. By demonstrating a direct impact of serotonin on motor behavior, we suggest a central role of this monoamine behind central fatigue.
U2 - 10.3389/fncir.2017.00111
DO - 10.3389/fncir.2017.00111
M3 - Journal article
C2 - 29375322
VL - 11
JO - Frontiers in Neural Circuits
JF - Frontiers in Neural Circuits
SN - 1662-5110
M1 - 111
ER -
ID: 189622240