title: Corticospinal Tract Tracing in the Marmoset with a Clinical Whole-Body 3T Scanner Using Manganese-Enhanced MRI.
abstract: Manganese-enhanced MRI (MEMRI) has been described as a powerful tool to depict the architecture of neuronal circuits. In this study we investigated the potential use of in vivo MRI detection of manganese for tracing neuronal projections from the primary motor cortex (M1) in healthy marmosets (Callithrix Jacchus). We determined the optimal dose of manganese chloride (MnCl2) among 800, 400, 40 and 8 nmol that led to manganese-induced hyperintensity furthest from the injection site, as specific to the corticospinal tract as possible, and that would not induce motor deficit. A commonly available 3T human clinical MRI scanner and human knee coil were used to follow hyperintensity in the corticospinal tract 24h after injection. A statistical parametric map of seven marmosets injected with the chosen dose, 8 nmol, showed the corticospinal tract and M1 connectivity with the basal ganglia, substantia nigra and thalamus. Safety was determined for the lowest dose that did not induce dexterity and grip strength deficit, and no behavioral effects could be seen in marmosets who received multiple injections of manganese one month apart. In conclusion, our study shows for the first time in marmosets, a reliable and reproducible way to perform longitudinal ME-MRI experiments to observe the integrity of the marmoset corticospinal tract on a clinical 3T MRI scanner.
authors.affiliation: Inserm, Imagerie cérébrale et handicaps neurologiques, UMR 825, F-31024, Toulouse, France; Université de Toulouse, UPS, Imagerie cérébrale et handicaps neurologiques, UMR 825, CHU Purpan, Place du Dr Baylac, F-31059, Toulouse, Cedex 9, France; CNRS-LAAS, 7 avenue du colonel Roche, F-31077, Toulouse, France.
authors.forename: Boris
authors.initials: B
authors.lastname: Demain
authors.affiliation: Inserm, Imagerie cérébrale et handicaps neurologiques, UMR 825, F-31024, Toulouse, France; Université de Toulouse, UPS, Imagerie cérébrale et handicaps neurologiques, UMR 825, CHU Purpan, Place du Dr Baylac, F-31059, Toulouse, Cedex 9, France.
authors.forename: Carole
authors.initials: C
authors.lastname: Davoust
authors.affiliation: Inserm, Imagerie cérébrale et handicaps neurologiques, UMR 825, F-31024, Toulouse, France; Université de Toulouse, UPS, Imagerie cérébrale et handicaps neurologiques, UMR 825, CHU Purpan, Place du Dr Baylac, F-31059, Toulouse, Cedex 9, France; Pôle Neurosciences, Centre Hospitalier Universitaire de Toulouse, Toulouse, France.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Plas
authors.affiliation: Inserm, Imagerie cérébrale et handicaps neurologiques, UMR 825, F-31024, Toulouse, France; Université de Toulouse, UPS, Imagerie cérébrale et handicaps neurologiques, UMR 825, CHU Purpan, Place du Dr Baylac, F-31059, Toulouse, Cedex 9, France.
authors.forename: Faye
authors.initials: F
authors.lastname: Bolan
authors.affiliation: Inserm, Imagerie cérébrale et handicaps neurologiques, UMR 825, F-31024, Toulouse, France; Université de Toulouse, UPS, Imagerie cérébrale et handicaps neurologiques, UMR 825, CHU Purpan, Place du Dr Baylac, F-31059, Toulouse, Cedex 9, France.
authors.forename: Kader
authors.initials: K
authors.lastname: Boulanouar
authors.affiliation: CNRS, Centre de Recherche Cerveau & Cognition, UMR 5549, F-31024, Toulouse, France.
authors.forename: Luc
authors.initials: L
authors.lastname: Renaud
authors.affiliation: Inserm, Imagerie cérébrale et handicaps neurologiques, UMR 825, F-31024, Toulouse, France; Université de Toulouse, UPS, Imagerie cérébrale et handicaps neurologiques, UMR 825, CHU Purpan, Place du Dr Baylac, F-31059, Toulouse, Cedex 9, France.
authors.forename: Robert
authors.initials: R
authors.lastname: Darmana
authors.affiliation: Inserm, Imagerie cérébrale et handicaps neurologiques, UMR 825, F-31024, Toulouse, France; Université de Toulouse, UPS, Imagerie cérébrale et handicaps neurologiques, UMR 825, CHU Purpan, Place du Dr Baylac, F-31059, Toulouse, Cedex 9, France.
authors.forename: Laurence
authors.initials: L
authors.lastname: Vaysse
authors.affiliation: CNRS-LAAS, 7 avenue du colonel Roche, F-31077, Toulouse, France.
authors.forename: Christophe
authors.initials: C
authors.lastname: Vieu
authors.affiliation: Inserm, Imagerie cérébrale et handicaps neurologiques, UMR 825, F-31024, Toulouse, France; Université de Toulouse, UPS, Imagerie cérébrale et handicaps neurologiques, UMR 825, CHU Purpan, Place du Dr Baylac, F-31059, Toulouse, Cedex 9, France.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Loubinoux
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D001921:Brain / Q000187:drug effects / Q000502:physiology; D002144:Callithrix; D002712:Chlorides / Q000008:administration & dosage / Q000494:pharmacology; D005240:Feasibility Studies; D005260:Female; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000295:instrumentation; D008297:Male; D008345:Manganese / Q000494:pharmacology*; D017895:Manganese Compounds / Q000008:administration & dosage / Q000494:pharmacology; D056347:Neuroanatomical Tract-Tracing Techniques / Q000379:methods*; D011712:Pyramidal Tracts / Q000187:drug effects / Q000502:physiology*; D013223:Statistics as Topic
chemical_list: D002712:Chlorides; D017895:Manganese Compounds; D008345:Manganese; C025340:manganese chloride