title: Identification of pleiotrophin in conditioned medium secreted from neural stem cells by SELDI-TOF and SELDI-tandem mass spectrometry.
abstract: Neural stem cells (NSCs) are multipotential progenitor cells that have self-renewal activity. Since the fates of the NSCs in situ depend on their niche containing growth factors and cytokines, we performed surface enhanced laser desorption/ionization time-of flight mass spectrometry (SELDI-TOF-MS) to screen for differentially secreted proteins in conditioned medium of neural stem cells and compared with that of NIH3T3 cells. A 15.3-kDa protein detected only in the conditioned medium of neural stem cells was determined as pleiotrophin (PTN) by SELDI-TOF-MS and ProteinChip-tandem MS systems. Identification of pleiotrophin was further confirmed by one-dimensional SDS gel electrophoresis and Edman degradation analysis. The mRNA transcripts of PTN and its receptors [receptor protein tyrosine phosphatase (RPTP) beta/zeta, N-syndecan and anaplastic lymphoma kinase (ALK)] were detected in neurosphere, suggesting that pleiotrophin signaling systems are present in the neural stem cells and are involved in the modulation of fate of neural stem cells.
authors.affiliation: Department of Neurosurgery, Faculty of Medicine, Saga University, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Furuta
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Shiraishi
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Okamoto
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Mineta
authors.forename: Kazuo
authors.initials: K
authors.lastname: Tabuchi
authors.forename: Mieko
authors.initials: M
authors.lastname: Shiwa
mesh_terms: D000077548:Anaplastic Lymphoma Kinase; D000818:Animals; D002352:Carrier Proteins / Q000032:analysis / Q000235:genetics / Q000378:metabolism*; D002450:Cell Communication / Q000502:physiology; D002454:Cell Differentiation / Q000502:physiology; D002478:Cells, Cultured; D017077:Culture Media, Conditioned / Q000032:analysis / Q000737:chemistry; D016207:Cytokines / Q000032:analysis / Q000235:genetics / Q000378:metabolism*; D013058:Mass Spectrometry; D008562:Membrane Glycoproteins / Q000378:metabolism; D051379:Mice; D008813:Mice, Inbred ICR; D039902:Multipotent Stem Cells / Q000378:metabolism*; D041681:NIH 3T3 Cells; D009419:Nerve Tissue Proteins / Q000378:metabolism; D009474:Neurons / Q000378:metabolism*; D017027:Protein Tyrosine Phosphatases / Q000378:metabolism; D011505:Protein-Tyrosine Kinases / Q000378:metabolism; D011509:Proteoglycans / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D020794:Receptor Protein-Tyrosine Kinases; D054633:Receptor-Like Protein Tyrosine Phosphatases, Class 5; D015398:Signal Transduction / Q000502:physiology; D018874:Spheroids, Cellular / Q000378:metabolism; D053670:Syndecan-3
chemical_list: D002352:Carrier Proteins; D017077:Culture Media, Conditioned; D016207:Cytokines; D008562:Membrane Glycoproteins; D009419:Nerve Tissue Proteins; D011509:Proteoglycans; D012333:RNA, Messenger; C508302:Sdc3 protein, mouse; D053670:Syndecan-3; C066845:pleiotrophin; C000626174:Alk protein, mouse; D000077548:Anaplastic Lymphoma Kinase; D011505:Protein-Tyrosine Kinases; D020794:Receptor Protein-Tyrosine Kinases; D017027:Protein Tyrosine Phosphatases; C516896:Ptprz1 protein, mouse; D054633:Receptor-Like Protein Tyrosine Phosphatases, Class 5