title: The novel protein MANI modulates neurogenesis and neurite-cone growth.
abstract: Neuronal regeneration and axonal re-growth in the injured mammalian central nervous system remains an unsolved field. To date, three myelin-associated proteins [Nogo or reticulon 4 (RTN4), myelin-associated glycoprotein (MAG) and oligodendrocyte myelin glycoprotein (OMG)] are known to inhibit axonal regeneration via activation of the neuronal glycosylphosphatidylinositol-anchored Nogo receptor [NgR, together with p75 neurotrophin receptor (p75NTR) and Lingo-1]. In the present study we describe the novel protein MANI (myelin-associated neurite-outgrowth inhibitor) that localizes to neural membranes. Functional characterization of MANI overexpressing neural stem cells (NSCs) revealed that the protein promotes differentiation into catecholaminergic neurons. Yeast two-hybrid screening and co-immunoprecipitation experiments confirmed the cell division cycle protein 27 (Cdc27) as an interacting partner of Mani. The analyses of Mani-overexpressing PC12 cells demonstrated that Mani retards neuronal axonal growth as a positive effector of Cdc27 expression and activity. We show that knockdown of Cdc27, a component of the anaphase-promoting complex (APC), leads to enhanced neurite outgrowth. Our finding describes the novel MANI-Cdc27-APC pathway as an important cascade that prevents neurons from extending axons, thus providing implications for the potential treatment of neurodegenerative diseases.
authors: Department of Molecular and Cell Biology, School of Biological Sciences, College of Science, Nanyang Technological University, Singapore.
authors: Manisha
authors: M
authors: Mishra
authors: Hiroyasu
authors: H
authors: Akatsu
authors: Klaus
authors: K
authors: Heese
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000235:genetics / Q000378:metabolism; D000818:Animals; D064191:Apc3 Subunit, Anaphase-Promoting Complex-Cyclosome; D015153:Blotting, Western; D001921:Brain / Q000378:metabolism / Q000473:pathology; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism; D045744:Cell Line, Tumor; D005260:Female; D015870:Gene Expression; D020439:Growth Cones / Q000378:metabolism*; D006367:HeLa Cells; D006801:Humans; D008297:Male; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism*; D058953:Neural Stem Cells / Q000378:metabolism; D016501:Neurites / Q000378:metabolism*; D055495:Neurogenesis; D016716:PC12 Cells; D010300:Parkinson Disease / Q000235:genetics / Q000378:metabolism; D011485:Protein Binding; D034622:RNA Interference; D051381:Rats; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D064191:Apc3 Subunit, Anaphase-Promoting Complex-Cyclosome; C577368:Cdc27 protein, rat; D018797:Cell Cycle Proteins; C569009:FAM168B protein, human; D008565:Membrane Proteins; D009419:Nerve Tissue Proteins