TY - JOUR
T1 - Neuronal roles of the integrin-associated protein (IAP/ CD47) in developing cortical neurons
AU - Numakawa, Tadahiro
AU - Ishimoto, Tetsuya
AU - Suzuki, Shingo
AU - Numakawa, Yumiko
AU - Adachi, Naoki
AU - Matsumoto, Tomoya
AU - Yokomaku, Daisaku
AU - Koshimizu, Hisatsugu
AU - Fujimori, Kazuhiro E.
AU - Hashimoto, Ryota
AU - Taguchi, Takahisa
AU - Kunugi, Hiroshi
PY - 2004/10/8
Y1 - 2004/10/8
N2 - Little is known about the role of the integrin-associated protein (IAP, or CD47) in neuronal development and its function in the central nervous system. We investigated neuronal responses in IAP-overexpressing cortical neurons using a virus-gene transfer system. We found that dendritic outgrowth was significantly enhanced in IAP (form 4)-transfected neurons. Furthermore, synaptic proteins including synaptotagmin, syntaxin, synapsin I, and SNAP25 (25-kDa synaptosomal associated protein) were up-regulated. In accordance with this finding, the release of the excitatory transmitter glutamate and the frequencies of Ca 2+ oscillations (glutamate-mediated synaptic transmission) were increased. Interestingly, the overexpression of IAP activated mitogen-activated protein kinase (MAPK), and this activation was required for the IAP-dependent biological effects. After down-regulation of the endogenous IAP by small interfering RNA, MAPK activity, synaptic protein levels, and glutamate release decreased. These observations suggest that the IAP plays important roles in dendritic outgrowth and synaptic transmission in developing cortical neurons through the activation of MAPK.
AB - Little is known about the role of the integrin-associated protein (IAP, or CD47) in neuronal development and its function in the central nervous system. We investigated neuronal responses in IAP-overexpressing cortical neurons using a virus-gene transfer system. We found that dendritic outgrowth was significantly enhanced in IAP (form 4)-transfected neurons. Furthermore, synaptic proteins including synaptotagmin, syntaxin, synapsin I, and SNAP25 (25-kDa synaptosomal associated protein) were up-regulated. In accordance with this finding, the release of the excitatory transmitter glutamate and the frequencies of Ca 2+ oscillations (glutamate-mediated synaptic transmission) were increased. Interestingly, the overexpression of IAP activated mitogen-activated protein kinase (MAPK), and this activation was required for the IAP-dependent biological effects. After down-regulation of the endogenous IAP by small interfering RNA, MAPK activity, synaptic protein levels, and glutamate release decreased. These observations suggest that the IAP plays important roles in dendritic outgrowth and synaptic transmission in developing cortical neurons through the activation of MAPK.
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U2 - 10.1074/jbc.M406733200
DO - 10.1074/jbc.M406733200
M3 - Article
C2 - 15297459
AN - SCOPUS:5644280071
SN - 0021-9258
VL - 279
SP - 43245
EP - 43253
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 41
ER -