Combined rehabilitation promotes recovery of motor functionality in a mouse model of stroke

Emilia Conti; Anna Letizia Allegra Mascaro; Francesco Resta; Alessandro Scaglione; Maria Pasquini; Silvestro Micera; Francesco S. Pavone

doi:10.1117/12.2508321

1 March 2019 Combined rehabilitation promotes recovery of motor functionality in a mouse model of stroke

Emilia Conti, Anna Letizia Allegra Mascaro, Francesco Resta, Alessandro Scaglione, Maria Pasquini, Silvestro Micera, Francesco S. Pavone

Author Affiliations +

Proceedings Volume 10865, Neural Imaging and Sensing 2019; 108650R (2019) https://doi.org/10.1117/12.2508321
Event: SPIE BiOS, 2019, San Francisco, California, United States

Abstract

Neuro-rehabilitative research is developing novel strategies to enhance the effectiveness of therapies after stroke by using a combination of physical and plasticizing treatments ^1-3. Previous studies have shown that repeated optogenetics stimulation of neurons in the peri-lesioned area induces a significant improvement in cerebral blood flow and neurovascular coupling response ^4-6. Up to now the mechanisms underneath the reshaping of brain circuitry induced by rehabilitation after stroke are widely unknown. To investigate how rehabilitative therapies shape new cortical maps in the peri-infarct region, we induce a photothrombotic stroke in the primary motor cortex and the expression of Channelrhodopsine 2 (ChR2) in the peri-infarct area on Thy1-GCaMP6f mice. To promote functional recovery after stroke we use both an optogenetic strategy to stimulate targeted excitatory neurons in the peri-lesional region and motor training on a robotic platform (M-Platform) ⁷. A 473 nm laser repeatedly stimulates ChR2-transfected neurons; the optostimulation is performed five days a week. The motor rehabilitation consists in a pulling task: after the forelimb is passively extended by the linear actuator of the M-platform, the animal has to pull back up to the resting position. By analysing the spatio-temporal calcium dynamic and the reshaping of cortical activation area during the movement throughout the treatment period, we found that the combined treatment restores cortical activation profiles during the forelimb movement. Through behavioural experiments, using Schallert test, we also evaluate changes of forelimb functionality during rehabilitation. Our combination of techniques allows obtaining unprecedented views on cortical plasticity induced by rehabilitative therapies.

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Emilia Conti, Anna Letizia Allegra Mascaro, Francesco Resta, Alessandro Scaglione, Maria Pasquini, Silvestro Micera, and Francesco S. Pavone "Combined rehabilitation promotes recovery of motor functionality in a mouse model of stroke", Proc. SPIE 10865, Neural Imaging and Sensing 2019, 108650R (1 March 2019); https://doi.org/10.1117/12.2508321

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KEYWORDS

Optogenetics

Neurons

Calcium

Robotics

Skull

Cameras

Light emitting diodes

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