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LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00003222naa a2200313 4500
001oai:prod.swepub.kib.ki.se:19486725
003SwePub
008240911s2003 | |||||||||||000 ||eng|
024a http://kipublications.ki.se/Default.aspx?queryparsed=id:194867252 URI
024a https://doi.org/10.1242/dev.005652 DOI
040 a (SwePub)ki
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
100a Holm, PCu Karolinska Institutet4 aut
2451 0a Crucial role of TrkB ligands in the survival and phenotypic differentiation of developing locus coeruleus noradrenergic neurons
264 1b The Company of Biologists,c 2003
520 a The role of glial cell-line derived neurotrophic factor (GDNF) and neurotrophins in the development of locus coeruleus noradrenergic neurons was evaluated. We found that two neurotrophic factors previously reported to prevent the degeneration of lesioned adult central noradrenergic neurons, GDNF and neurotrophin 3 (NT3), do not play significant roles in the prenatal development of locus coeruleus noradrenergic neurons, as demonstrated by: (1)the lack of alterations in double Gdnf/Nt3 null mutant mice;and (2) the lack of survival-promoting effects of GDNF and/or NT3 in rat E13.5 primary cultures. In contrast, null mutant mice for TrkB, the tyrosine kinase receptor for brain-derived neurotrophic factor and neurotrophin 4, displayed a clear loss of locus coeruleus noradrenergic neurons. In accordance with this,treatment of rat E13.5 primary cultures with TrkB ligands prevented the early loss of noradrenergic neurons and maintained their survival for up to 6 days in vitro. Moreover, an additional 5-10-fold increase in the number of tyrosine hydroxylase positive noradrenergic neurons was detected after 12 hours in culture. This second effect of TrkB ligands involved neither proliferation nor survival, because the number of BrdU- or TUNEL-positive noradrenergic neurons did not change and the effect was elicited by delayed administration of either factor. Because TrkB ligands increased the number of tyrosine hydroxylase-positive cells expressing Phox2a, a paired homeodomain protein required for the development of locus coeruleus noradrenergic neurons, but did not affect the number of Phox2a-positive tyrosine hydroxylase-negative cells,our results suggest that the second effect of TrkB ligands may involve promoting or inducing a noradrenergic phenotype. In summary, our findings suggest that, unlike NT3 and GDNF, TrkB ligands are required and sufficient to promote the development of central noradrenergic neurons.
700a Rodriguez, FJ4 aut
700a Kresse, A4 aut
700a Canals, JM4 aut
700a Silos-Santiago, I4 aut
700a Arenas, Eu Karolinska Institutet4 aut
710a Karolinska Institutet4 org
773t Development (Cambridge, England)d : The Company of Biologistsg 130:15, s. 3535-3545q 130:15<3535-3545x 0950-1991x 1477-9129
856u http://dev.biologists.org/content/130/15/3535.full.pdf
8564 8u http://kipublications.ki.se/Default.aspx?queryparsed=id:19486725
8564 8u https://doi.org/10.1242/dev.00565

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