Differential regulation of mRNAs for GDNF and its receptors Ret and GDNFR alpha after sciatic nerve lesion in the mouse.
Glial cell line-derived neurotrophic factor (GDNF), first characterized for its effect on dopamine uptake in central dopaminergic neurons, appears to be a powerful neurotrophic factor for motor neurons. GDNF has recently been shown to signal through a multisubunit receptor. This receptor is composed of a ligand-binding subunit, called GDNF receptor alpha (GDNFR alpha), and a signalling tyrosine kinase subunit, Ret. To gain further insight into GDNF function, we investigated the expression of GDNF and its receptors after nerve lesion in adult mice. Analysis of expression in muscle, nerve and spinal cord by RNase protection assay and in situ hydridization revealed that, in adult non-lesioned mice, GDNF mRNA was expressed in the nerve and GDNFR alpha mRNA in the nerve and the spinal cord, while the expression of Ret was restricted to spinal cord motor neurons. After a sciatic nerve crush a rapid increase in GDNF mRNA was observed in the distal part of the nerve and a delayed elevation in the muscle, while GDNFR alpha mRNA was up-regulated in the distal part of the sciatic nerve but not in proximal nerve or spinal cord. The lesion also induced a rapid increase in Ret mRNA expression, but the increase was observed only in spinal cord motor neurons and in dorsal root ganglion neurons. A pattern of expression of GDNF and its receptors similar to that seen after lesion in the adult was detected during embryonic development. Administration of GDNF enhanced sciatic nerve regeneration measured by the nerve pinch test. Taken together, these results suggest that GDNF has an important role during regeneration after nerve damage in the adult.
Naveilhan
P
P
Laboratory of Molecular Neurobiology, MBB, Karolinska Institute, Stockholm, Sweden.
ElShamy
W M
WM
Ernfors
P
P
D000818:Animals; D029721:Drosophila Proteins; D004622:Embryo, Mammalian / Q000378:metabolism; D005314:Embryonic and Fetal Development; D005727:Ganglia, Spinal / Q000166:cytology / Q000378:metabolism*; D051100:Glial Cell Line-Derived Neurotrophic Factor; D051097:Glial Cell Line-Derived Neurotrophic Factor Receptors; D051379:Mice / Q000196:embryology; D009046:Motor Neurons / Q000378:metabolism; D009132:Muscles / Q000378:metabolism; D009409:Nerve Crush; D009414:Nerve Growth Factors; D009416:Nerve Regeneration; D009419:Nerve Tissue Proteins / Q000235:genetics* / Q000378:metabolism; D018696:Neuroprotective Agents; D011518:Proto-Oncogene Proteins / Q000235:genetics*; D051096:Proto-Oncogene Proteins c-ret; D012333:RNA, Messenger / Q000378:metabolism*; D051381:Rats / Q000196:embryology; D020794:Receptor Protein-Tyrosine Kinases / Q000235:genetics*; D012584:Sciatic Nerve / Q000187:drug effects / Q000378:metabolism / Q000502:physiology*; D013116:Spinal Cord / Q000166:cytology / Q000378:metabolism
D029721:Drosophila Proteins; C495040:Gdnf protein, mouse; C495041:Gdnf protein, rat; D051100:Glial Cell Line-Derived Neurotrophic Factor; D051097:Glial Cell Line-Derived Neurotrophic Factor Receptors; D009414:Nerve Growth Factors; D009419:Nerve Tissue Proteins; D018696:Neuroprotective Agents; D011518:Proto-Oncogene Proteins; D012333:RNA, Messenger; D051096:Proto-Oncogene Proteins c-ret; D020794:Receptor Protein-Tyrosine Kinases; C416649:Ret protein, Drosophila; C494999:Ret protein, mouse; C495001:Ret protein, rat