Recombinant GDNF:tetanus toxin fragment C fusion protein produced from insect cells.
Biochem Biophys Res Commun. 2009 May 21;
Authors: Li J, Chian RJ, Ay I, Celia SA, Kashi BB, Tamrazian E, Matthews JC, Remington MP, Pepinsky RB, Fishman PS, Brown Jr RH, Francis JW
Glial cell line-derived neurotrophic factor (GDNF) has potent survival-promoting effects on CNS motor neurons in experimental animals. Its therapeutic efficacy in humans, however, may have been limited by poor bioavailability to the brain and spinal cord. With a view toward improving delivery of GDNF to CNS motor neurons in vivo, we generated a recombinant fusion protein comprised of rat GDNF linked to the non-toxic, neuron-binding fragment of tetanus toxin. Recombinant GDNF:TTC produced from insect cells was a soluble homodimer like wild-type GDNF and was bi-functional with respect to GDNF and TTC activity. Like recombinant rat GDNF, the fusion protein increased levels of immunoreactive phosphoAkt in treated NB41A3-hGFRalpha-1 neuroblastoma cells. Like TTC, GDNF:TTC bound to immobilized ganglioside GT1b in vitro with high affinity and selectivity. These results support further testing of recombinant GDNF:TTC as a non-viral vector to improve delivery of GDNF to brain and spinal cord in vivo.
PMID: 19465006 [PubMed - as supplied by publisher]