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        An Immunohistochemical Study of ErbB4 Receptor in Alzheimer’s Disease Hippocampus

        우란숙,Ji-Hye Lee,Sung-Sam Jung,Yoon-Jung Choy2,Ha-Nul Yu,Kyoung-Min Oh,송대용,Jin Kwon,Tai-Kyoung Baik 대한해부학회 2009 Anatomy & Cell Biology Vol.42 No.4

        Neuregulin-1 (NRG1) signaling participates in numerous neurodevelopmental processes. Although ErbB4, a key NRG1 receptor, is expressed in multiple regions in the adult animal brain, little is known about its expression in aged human brain. We show that ErbB4 immunoreactivity was shown regional difference in the hippocampus of age-matched control and that the distribution of these molecules was altered in Alzheimer’s disease (AD) brains. Immunohistochemical characterization of the distribution of ErbB4 receptor in the hippocampus relative to pathology staging were performed in age-matched control (Braak stage Ⅰ/Ⅱ, n=5), early AD (Braak stage Ⅲ/Ⅳ, n=5) and advanced AD(Braak stage Ⅴ/Ⅵ, n=10). The intensity of ErbB4 immunoreactivity was higher in neurons of the CA2 than that in CA1 or CA3 in the age-matched control. Particularly, in the early AD, ErbB4 immunoreactivity was significantly increased in the apoptotic cells of the CA2 field. In the advanced AD, ErbB4 immunostaining was more intense in the apoptotic cell of the CA2 field. In the dentate gyrus (DG), ErbB4-positive granular cell density was gradually increased in proportion to the progression of pathology of AD brains. We have also found that ErbB4 immunostaining was increased in the nucleus, suggesting that the presenilin-dependent cleavage of ErbB4 generates the soluble ErbB4 ICD (intracellular domain) that translocalized to the nucleus. Together, these results provide the immunohistochemical analysis of ErbB4 receptor in the human hippocampus staged by the progression of pathology of AD.

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