Linked Life Data

17823845

Source:http://linkedlifedata.com/resource/pubmed/id/17823845

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2008-1-21
pubmed:databankReference
pubmed:abstractText
Repulsive guidance molecule (RGM) a is a glycosylphosphatidylinositol (GPI)-anchored plasma membrane protein that has been implicated in chemorepulsive axon guidance. Although RGMa binds the transmembrane receptor Neogenin, the developmental events controlled by the RGMa-Neogenin interactions in vivo remain largely unknown. We have cloned full-length RGMa from Xenopus borealis for the first time and identified two homologous genes referred to as RGMa1 and RGMa2. Here we show RGMa1 overexpression at 2-cell-stage resulted in cell death, which lead to an early embryonic lethal phenotype of the embryos. Time-lapse photomicroscopy revealed that embryos began to show initial morphological defects from approximately 5 h post-fertilization (hpf) which was then followed by extensive blastomere cell death at approximately 11 hpf. This phenotype was rescued by simultaneous knock down of RGMa using translation blocking anti-sense morpholinos. Knock down of the RGMa1 receptor Neogenin in RGMa1 overexpressing embryos was also able to rescue the phenotype. Together these results indicated that RGMa1 was signalling through Neogenin to induce cell death in the early embryo. While previous studies have suggested that Neogenin is a dependence receptor that induces cell death in the absence of RGM, we have instead shown that Neogenin-RGM interactions induce cell death in the early embryo. The roles of RGMa1 and Neogenin appear to be context specific so that their co-ordinated and regulated expressions are essential for normal development of the vertebrate embryo.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
1567-2379
pubmed:author
pubmed:issnType
Print
pubmed:volume
39
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
105-13
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Overexpression of repulsive guidance molecule (RGM) a induces cell death through Neogenin in early vertebrate development.
pubmed:affiliation
Brain Growth and Regeneration Lab, School of Biomedical Sciences, The University of Queensland, Brisbane, 4072, QLD, Australia. j.shin@uq.edu.au
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't