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Effects of corticosterone injections in mid-to-late mouse postnatal development on adult motor activity and coordination

Abstract : Glucocorticoids are involved in the developing brain but, in excessive amounts, may depress its growth and cause psychomotor development disorders. To test the long-term vulnerability of motor structures such as the cerebellum to supraphysiological corticosterone (CORT), the hormone was subcutaneously delivered at a dose of 20 mg/kg from postnatal day (P) 8 to P29 in C57BL/6 male mice evaluated for sensorimotor functions at P15, P22, P29, and 3 months. Relative to placebo, CORT increased motor activity in the open-field at P29 and 3 months as well as facilitating rotorod acquisition and visuomotor control necessary for swimming towards a visible goal without affecting spatial learning in the Morris water maze. CORT caused lobulespecific effects on cerebellar morphology by decreasing granule cell layer thickness in simplex lobule but increasing molecular and granule cell layer thickness in crus 2. The functional impact of these changes is indicated by significant correlations found between cerebellar size and activity levels or proficiency on the rotorod test of motor coordination.
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https://hal.univ-lorraine.fr/hal-03219976
Contributor : Catherine Strazielle <>
Submitted on : Thursday, May 6, 2021 - 8:24:21 PM
Last modification on : Monday, May 10, 2021 - 11:37:38 AM

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Magali Hernandez, Guillaume Harlé, Robert Lalonde, Catherine Strazielle. Effects of corticosterone injections in mid-to-late mouse postnatal development on adult motor activity and coordination. Neuroscience Research, Elsevier, 2021, 164, pp.22-32. ⟨10.1016/j.neures.2020.03.012⟩. ⟨hal-03219976⟩

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