OBJECTIVE: Previous reports have demonstrated that some focal brain injuries increase amyloid precursor protein (APP) immunoreactivity in the region surrounding the injury in the cerebral cortex. However, the chronologic changes in APP expression have not been evaluated after traumatic brain injury (TBI). METHODS: In this study, we immunohistochemically and biologically investigated chronologic changes in cellular sources and levels of APP production after rat TBI. RESULTS: In the present report, we show that traumatic brain injury increased the expression of APP in the neuronal perikarya and in damaged dystrophic neurites from 1 to 90 days after injury. Moreover, 7 days after injury, some macrophages/microglia also were co-localized with APP, which was overproduced by the neuronal perikarya and APP-positive dystrophic neurites after injury and then APP were phagocytosed by macrophages/microglia during this phase. However, astroglia did not express APP immunopositivity after brain injury. DISCUSSION: These results suggested that long-term overexpression of APP was confirmed by immunohistochemical and biologic technique after TBI. This may be related to the induction of Alzheimer type dementia and it is a very important risk factor for this disease.
OBJECTIVE: Previous reports have demonstrated that some focal brain injuries increase amyloid precursor protein (APP) immunoreactivity in the region surrounding the injury in the cerebral cortex. However, the chronologic changes in APP expression have not been evaluated after traumatic brain injury (TBI). METHODS: In this study, we immunohistochemically and biologically investigated chronologic changes in cellular sources and levels of APP production after rat TBI. RESULTS: In the present report, we show that traumatic brain injury increased the expression of APP in the neuronal perikarya and in damaged dystrophic neurites from 1 to 90 days after injury. Moreover, 7 days after injury, some macrophages/microglia also were co-localized with APP, which was overproduced by the neuronal perikarya and APP-positive dystrophic neurites after injury and then APP were phagocytosed by macrophages/microglia during this phase. However, astroglia did not express APP immunopositivity after brain injury. DISCUSSION: These results suggested that long-term overexpression of APP was confirmed by immunohistochemical and biologic technique after TBI. This may be related to the induction of Alzheimer type dementia and it is a very important risk factor for this disease.
Authors: Kendra L Puig; Adam J Swigost; Xudong Zhou; Mary Ann Sens; Colin K Combs Journal: J Neuroimmune Pharmacol Date: 2011-11-29 Impact factor: 4.147
Authors: Yanling Hu; Amos C Hung; Hao Cui; Edgar Dawkins; Marta Bolós; Lisa Foa; Kaylene M Young; David H Small Journal: J Biol Chem Date: 2013-05-13 Impact factor: 5.157
Authors: Olga Kokiko-Cochran; Lena Ransohoff; Mike Veenstra; Sungho Lee; Maha Saber; Matt Sikora; Ryan Teknipp; Guixiang Xu; Shane Bemiller; Gina Wilson; Samuel Crish; Kiran Bhaskar; Yu-Shang Lee; Richard M Ransohoff; Bruce T Lamb Journal: J Neurotrauma Date: 2015-11-23 Impact factor: 5.269