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role of IGF-1 in cortical plasticity and functional deficit induced by sensorimotor restriction

Abstract : In the adult rat, sensorimotor restriction by hindlimb unloading (HU) is known to induce impairments in motor behavior as well as a disorganization of somatosensory cortex (shrinkage of the cortical representation of the hindpaw, enlargement of the cutaneous receptive fields, decreased cutaneous sensibility threshold). Recently, our team has demonstrated that IGF-1 level was decreased in the somatosensory cortex of rats submitted to a 14-day period of HU. To determine whether IGF-1 is involved in these plastic mechanisms, a chronic cortical infusion of this substance was performed by means of osmotic minipump. When administered in control rats, IGF-1 affects the size of receptive fields and the cutaneous threshold, but has no effect on the somatotopic map. In addition, when injected during the whole HU period, IGF-1 is interestingly implied in cortical changes due to hypoactivity: the shrinkage of somatotopic representation of hindlimb is prevented, whereas the enlargement of receptive fields is reduced. IGF-1 has no effect on the increase in neuronal response to peripheral stimulation. We also explored the functional consequences of IGF-1 level restoration on tactile sensory discrimination. In HU rats, the percentage of paw withdrawal after a light tactile stimulation was decreased, whereas it was similar to control level in HU-IGF-1 rats. Taken together, the data clearly indicate that IGF-1 plays a key-role in cortical plastic mechanisms and in behavioral alterations induced by a decrease in sensorimotor activity.
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Soumis le : lundi 17 mai 2021 - 14:36:34
Dernière modification le : mercredi 23 mars 2022 - 15:51:23



Julien Mysoet, Erwan Dupont, Bruno Bastide, Marie-Hélène Canu. role of IGF-1 in cortical plasticity and functional deficit induced by sensorimotor restriction. Behavioural Brain Research, Elsevier, 2015, Behavioural brain research, 290, pp.117-123. ⟨10.1016/j.bbr.2015.04.055⟩. ⟨hal-03227633⟩



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