title: The receptor tyrosine kinase, Cek8, is transiently expressed on subtypes of motoneurons in the spinal cord during development.
abstract: Receptor tyrosine kinases (RTKs) play important roles in cellular proliferation, differentiation, and survival. We performed reverse transcriptase-polymerase chain reactions (RT-PCR) from enriched embryonic day 5 (E5) chick motoneurons by panning to identify RTKs involved in the early development of motoneuron. In situ hybridization revealed that Cek8, a member of the eph family, was specifically expressed on motoneurons at the brachial and lumbar segments of the spinal cord which innervate limb muscles, and disappeared after the naturally occurring cell death period (E6-E11). Immunohistochemistry using an anti-Cek8 monoclonal antibody showed the localization of Cek8 protein at the cell bodies and axonal fibers of motoneurons and muscles. The unique expression of Cek8 suggests its involvement in cellular survival or cell-cell interactions for specific subpopulations of developing motoneurons.
authors.affiliation: Department of Neuroscience and Immunology, Kumamoto University Graduate School of Medical Sciences, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ohta
authors.forename: M
authors.initials: M
authors.lastname: Nakamura
authors.forename: K
authors.initials: K
authors.lastname: Hirokawa
authors.forename: S
authors.initials: S
authors.lastname: Tanaka
authors.forename: A
authors.initials: A
authors.lastname: Iwama
authors.forename: T
authors.initials: T
authors.lastname: Suda
authors.forename: M
authors.initials: M
authors.lastname: Ando
authors.forename: H
authors.initials: H
authors.lastname: Tanaka
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D017209:Apoptosis; D001483:Base Sequence; D002460:Cell Line; D002461:Cell Line, Transformed; D002642:Chick Embryo; D002522:Chlorocebus aethiops; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics; D004790:Enzyme Induction; D005121:Extremities / Q000196:embryology / Q000294:innervation; D018507:Gene Expression Regulation, Developmental; D006801:Humans; D017403:In Situ Hybridization; D007668:Kidney; D008969:Molecular Sequence Data; D009046:Motor Neurons / Q000201:enzymology*; D009419:Nerve Tissue Proteins / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology / Q000502:physiology; D009469:Neuromuscular Junction / Q000201:enzymology; D009479:Neuropeptides / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology / Q000502:physiology; D016133:Polymerase Chain Reaction; D020794:Receptor Protein-Tyrosine Kinases / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology / Q000502:physiology; D036122:Receptor, EphA4; D016415:Sequence Alignment; D013116:Spinal Cord / Q000166:cytology / Q000196:embryology* / Q000201:enzymology; D014162:Transfection
chemical_list: D000911:Antibodies, Monoclonal; D018076:DNA, Complementary; D009419:Nerve Tissue Proteins; D009479:Neuropeptides; D020794:Receptor Protein-Tyrosine Kinases; D036122:Receptor, EphA4