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  • Availability of Pre- and Pro-regions of Transgenic GDNF Affects the Ability to Induce Axonal Sprout Growth.

Availability of Pre- and Pro-regions of Transgenic GDNF Affects the Ability to Induce Axonal Sprout Growth.

Molecular neurobiology (2014-07-06)
Nadezda Kust, Dmitri Panteleev, Ilya Mertsalov, Ekaterina Savchenko, Ekaterina Rybalkina, Alexander Revishchin, Galina Pavlova
ABSTRACT

Plasmids containing four GFP-tagged isoforms of the human GDNF gene, with both pre- and pro-regions (pre-pro- GDNF), with the pre- (pre-GDNF) or the pro-region (pro-GDNF) alone, and without the pre- and pro-regions (mGDNF), were used to transfect HEK293 cells (human embryonic kidney cell line). The effect of the transgenic products on the growth of processes was studied in the spinal ganglia of 14-day rat embryos. Media conditioned by the transgenic cells were used to culture explants and dissociated cells of embryonic dorsal root ganglia attached to the bottom of the plate. Medium conditioned by gfp-transgenic HEK293 cells was used as the control. Spinal ganglia explants and dissociated cells cultured in a medium supplemented with recombinant GDNF (recGDNF) as well as in conditioned media containing the pre-GDNF and mGDNF products demonstrated active growth of processes immunopositive for neuronal marker beta-3-tubulin as early as on culture day 4. The ganglia and cells cultured in control medium and media conditioned by cells transgenic for pro-GDNF had no or very few processes even after 10 days of culture.

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