Team:Slovenia/SafetyMechanismsMicrocapsuleDegradation

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Microcapsule degradation

We implemented microencapsulation of engineered human cells and designed the system for degradation of alginate microcapsules.

Engineered HEK293T cells were succesfully incorporated into alginate microcapsules and extended time viability of the encapsulated cells was demonstrated.

Secretory alginate lyases from Pseudomoalteromonas elyakovii and from Pseudomonas aeruginosa were cloned by replacing the signal peptide of the alginate lyase with the eukaryotic signal peptide.

Alginate lyases were succesfully produced and secreted from HEK293T cells.

Degradation of alginate beads was demonstrated by alginate lyase from Sphingobacterium multivorum.


References

Bauer, S., Groh, V., Wu, J., Steinle, A., Phillips, J.H., Lanier, L.L., Spies, T. (1999) Activation of NK Cells and T Cells by NKG2D, a receptor for Stress-Inducible MICA. Science 285, 727-729.

Borrego, F., Kabat, J., Kim, D.K., Lieto, L., Maasho, K., Peña, J., Solana, R., Coligan J.E. (2001) Structure and function of major histocompatibility complex (MHC) class I specific receptors expressed on human natural killer (NK) cells. Mol. Immunol. 38, 637-660.

Groh, V., Rhinehart, R., Secrist, H., Bauer., S., Grabstein, K.H., Spies, T. (1999) Broad tumor-associated expression and recognition by tumor-derived gd T cells of MICA and MICB. Proc. Natl. Acad. Sci. 96, 6879–6884.

Salih, H.R., Rammensee, H.G., Steinle, A. (2002) Cutting Edge: Down-Regulation of MICA on Human Tumors by Proteolytic Shedding. J Immunol. 169, 4098-4102.

Stenile, A., Li, P., Morris, D.L., Groh, V., Lanier, L.L., Strong, R.K., Spies, T. (2001) Interactions of human NKG2D with its ligands MICA, MICB, and homologs of the mouse RAE-1 protein family. Immunogenet. 53, 279-287.