Involvement of NCAM in the effects of GDNF on the neurite outgrowth in the dopamine neurons.
Glial cell line-derived neurotrophic factor (GDNF) exerts its biological effects via a multi-component receptor system including the ligand binding receptor--GDNF family receptor-alpha1 (GFRalpha1) and the signaling receptor--RET tyrosine kinase. Recently, the neural cell adhesion molecule (NCAM) has been identified as an alternative signaling receptor for GDNF. The purpose of this study was to investigate whether NCAM could mediate the protective effect of GDNF on injured dopamine (DA) neurons and to determine which cytoplasmic signal molecule associated with NCAM was activated while GDNF performing this effect. The results showed that the phosphorylation of NCAM-associated Fyn was upregulated with GDNF treatment, and this upregulation was inhibited by pre-treatment with the NCAM function-blocking antibody. Moreover, pre-treatment with the antibody could abolish the effect of GDNF on promoting the neurite outgrowth of these DA neurons, except for the effect of GDNF on promoting the expression of tyrosine hydroxylase (TH) in these DA neurons. These results suggest that NCAM is involved in the promotive effect of GDNF on the neurite outgrowth in lesioned DA neurons, but not involved in the promotive effect of GDNF on TH expression in these neurons.
Department of Neurobiology, Xuzhou Medical College, 84 West Huai-hai Road, Xuzhou, Jiangsu 221002, PR China. junping3177@sina.com
Jun-Ping
JP
Cao
Hong-Jun
HJ
Wang
Jing-Kao
JK
Yu
Hua
H
Yang
Cheng-Hua
CH
Xiao
Dian-Shuai
DS
Gao
D018663:Adrenergic Agents / Q000494:pharmacology; D000704:Analysis of Variance; D000818:Animals; D000906:Antibodies / Q000494:pharmacology; D002478:Cells, Cultured; D004298:Dopamine / Q000378:metabolism*; D004622:Embryo, Mammalian; D005260:Female; D051100:Glial Cell Line-Derived Neurotrophic Factor / Q000494:pharmacology*; D047468:Immunoprecipitation; D008297:Male; D008636:Mesencephalon / Q000166:cytology; D009124:Muscle Proteins / Q000235:genetics / Q000378:metabolism; D019006:Neural Cell Adhesion Molecules / Q000276:immunology / Q000378:metabolism*; D016501:Neurites / Q000187:drug effects*; D009474:Neurons / Q000166:cytology* / Q000187:drug effects; D009924:Organ Culture Techniques; D016627:Oxidopamine / Q000494:pharmacology; D011247:Pregnancy; D051381:Rats; D017207:Rats, Sprague-Dawley; D014446:Tyrosine 3-Monooxygenase / Q000378:metabolism; D015854:Up-Regulation / Q000187:drug effects
D018663:Adrenergic Agents; D000906:Antibodies; D051100:Glial Cell Line-Derived Neurotrophic Factor; D009124:Muscle Proteins; D019006:Neural Cell Adhesion Molecules; D016627:Oxidopamine; D014446:Tyrosine 3-Monooxygenase; D004298:Dopamine