title: Accumulation of glycogen in axotomized adult rat facial motoneurons.
abstract: This study biochemically determined glycogen content in the axotomized facial nucleus of adult rats up to 35 days postinsult. The amounts of glycogen in the transected facial nucleus were significantly increased at 5 days postinsult, peaked at 7 days postinsult, and declined to the control levels at 21-35 days postinsult. Immunohistochemical analysis with antiglycogen antibody revealed that the quantity of glycogen granules in the axotomized facial nucleus was greater than that in the control nucleus at 7 days postinjury. Dual staining methods with antiglycogen antibody and a motoneuron marker clarified that the glycogen was localized mainly in motoneurons. Immunoblotting and quantification analysis revealed that the ratio of inactive glycogen synthase (GS) to total GS was significantly decreased in the injured nucleus at about 1-3 days postinsult and significantly increased from 7 to 14 days postinsult, suggesting that glycogen is actively synthesized in the early period postinjury but suppressed after 7 days postinsult. The enhanced glycogen at about 5-7 days postinsult is suggested to be responsible for the decrease in inactive GS levels, and the decrease of glycogen after 7 days postinsult is considered to be caused by increased inactive GS levels and possibly the increase in active glycogen phosphorylase.
authors.affiliation: Department of Bioinformatics, Faculty of Engineering, Soka University, Tokyo, Japan.
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Takezawa
authors.forename: Otto
authors.initials: O
authors.lastname: Baba
authors.forename: Shinichi
authors.initials: S
authors.lastname: Kohsaka
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Nakajima
mesh_terms: D000818:Animals; D019771:Axotomy; D004195:Disease Models, Animal; D065828:Facial Nucleus / Q000293:injuries* / Q000473:pathology*; D005904:Glial Fibrillary Acidic Protein / Q000378:metabolism; D005947:Glucose / Q000378:metabolism; D006003:Glycogen / Q000378:metabolism*; D006006:Glycogen Synthase / Q000378:metabolism; D008297:Male; D009046:Motor Neurons / Q000145:classification / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D013997:Time Factors
chemical_list: D005904:Glial Fibrillary Acidic Protein; D006003:Glycogen; D006006:Glycogen Synthase; D005947:Glucose
keywords: axotomy; facial nerve; glycogen; glycogen synthase; motoneuron