Tetanus toxin fragments and Bcl-2 fusion proteins: cytoprotection and retrograde axonal migration View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2018-12

AUTHORS

Yasuhiro Watanabe, Takashi Matsuba, Mami Nakanishi, Mio Une, Ritsuko Hanajima, Kenji Nakashima

ABSTRACT

BACKGROUND: Tetanus neurotoxin (TeNT) is taken up at nerve terminals and undergoes retrograde migration. The toxic properties of TeNT reside in the toxin light chain (L), but like complete TeNT, the TeNT heavy chain (TTH) and the C-terminal domain (TTC) alone can bind and enter into neurons. Here, we explored whether atoxic fragments of TeNT could act as drug delivery vehicles in neurons. In this study, we used Bcl-2, a protein known to have anti-apoptotic properties in vivo and in vitro, as a parcel to couple to TeNT fragments. RESULTS: We expressed Bcl-2 and the TTC fragments alone, and also attempted to express fusion proteins with the Bcl-2 coupled at the N-terminus of TTH (Bcl2-TTH) and the N- and C-terminus of TTC (TTC-Bcl2 and Bcl2-TTC) in mammalian (Cos7 cells) and Escherichia coli systems. TTC and Bcl-2 were efficiently expressed in E. coli and Cos7 cells, respectively, but Bcl-2 and the fusion proteins did not express well in E. coli. The fusion proteins were also not expressed in Cos7 cells. To improve the yield and purity of the fusion protein, we genetically deleted the N-terminal half of TTC from the Bcl2-TTC fusion to yield Bcl2-hTTC. Purified Bcl2-hTTC exhibited neuronal binding and prevented cell death of neuronal PC12 cells induced by serum and NGF deprivation, as evidenced by the inhibition of cytochrome C release from the mitochondria. For in vivo assays, Bcl2-hTTC was injected into the tongues of mice and was seen to selectively migrate to hypoglossal nuclei mouse brain stems via retrograde axonal transport. CONCLUSIONS: These results indicate that Bcl2-hTTC retains both Bcl-2 and TTC functions and therefore could be a potent therapeutic agent for various neurological conditions. More... »

PAGES

39

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/s12896-018-0452-z

DOI

http://dx.doi.org/10.1186/s12896-018-0452-z

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1104530806

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/29890980


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40 schema:description BACKGROUND: Tetanus neurotoxin (TeNT) is taken up at nerve terminals and undergoes retrograde migration. The toxic properties of TeNT reside in the toxin light chain (L), but like complete TeNT, the TeNT heavy chain (TTH) and the C-terminal domain (TTC) alone can bind and enter into neurons. Here, we explored whether atoxic fragments of TeNT could act as drug delivery vehicles in neurons. In this study, we used Bcl-2, a protein known to have anti-apoptotic properties in vivo and in vitro, as a parcel to couple to TeNT fragments. RESULTS: We expressed Bcl-2 and the TTC fragments alone, and also attempted to express fusion proteins with the Bcl-2 coupled at the N-terminus of TTH (Bcl2-TTH) and the N- and C-terminus of TTC (TTC-Bcl2 and Bcl2-TTC) in mammalian (Cos7 cells) and Escherichia coli systems. TTC and Bcl-2 were efficiently expressed in E. coli and Cos7 cells, respectively, but Bcl-2 and the fusion proteins did not express well in E. coli. The fusion proteins were also not expressed in Cos7 cells. To improve the yield and purity of the fusion protein, we genetically deleted the N-terminal half of TTC from the Bcl2-TTC fusion to yield Bcl2-hTTC. Purified Bcl2-hTTC exhibited neuronal binding and prevented cell death of neuronal PC12 cells induced by serum and NGF deprivation, as evidenced by the inhibition of cytochrome C release from the mitochondria. For in vivo assays, Bcl2-hTTC was injected into the tongues of mice and was seen to selectively migrate to hypoglossal nuclei mouse brain stems via retrograde axonal transport. CONCLUSIONS: These results indicate that Bcl2-hTTC retains both Bcl-2 and TTC functions and therefore could be a potent therapeutic agent for various neurological conditions.
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