Abstract
Delivery of therapeutic proteins into tissues and across the blood–brain barrier (BBB) is limited by the size and biochemical properties of the proteins. Efficient delivery across BBB is generally restricted to small, highly lipophilic molecules. However, in the last decades, several peptides that can pass cell membranes have been identified. It has been shown that these peptides are also capable of delivering large hydrophilic cargoes into cells and are therefore a powerful biological tool for transporting drugs across cell membranes and even into the brain. We designed and prepared a single-chain antibody fragment (scFvs), specific for the pathological form of the prion protein (PrPSc), where a cell-penetrating peptide (CPP) was used as a linker between the two variable domains of the scFv. The intravenously administered recombinant scFv-CPP was successfully targeted to and delivered into mouse brain cells. Our single-chain antibody fragments are of special interest in view of possible therapeutic reagents design not only for prion diseases but also for other neurodegenerative diseases.
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Abbreviations
- ABTS:
-
2,2′-Azino-bis(3-ethylbenzthiazoline-6-sulphonic acid)
- CNS:
-
Central nervous system
- CPP:
-
Cell-penetrating peptides
- DAPI:
-
4′,6-Diamidino-2-phenylindole
- Fv:
-
Antibody variable domains (Vl + Vh)
- HRP:
-
Horseradish peroxidase
- IMAC:
-
Immobilized metal ion affinity chromatography
- IPTG:
-
Isopropyl β-d-1-thiogalactopyranoside
- LLH:
-
scFv in Vl-linker-Vh chain arrangement
- PBS:
-
Phosphate-buffered saline
- PrP:
-
Prion protein
- PrPC :
-
Cellular form of the PrP
- PrPSc :
-
Pathogenic form of the PrP
- scFv:
-
Antibody single-chain fragment
- TBS:
-
Tris-buffered saline
- TMB:
-
3,3′,5,5′-Tetramethylbenzidine
- Vh:
-
Variable domain of the heavy-chain of an antibody
- Vl:
-
Variable domain of the light chain of an antibody
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Acknowledgments
This work was supported by the Slovenian Research Agency Ph.D. grant for N. Škrlj.
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Škrlj, N., Drevenšek, G., Hudoklin, S. et al. Recombinant Single-Chain Antibody with the Trojan Peptide Penetratin Positioned in the Linker Region Enables Cargo Transfer Across the Blood–Brain Barrier. Appl Biochem Biotechnol 169, 159–169 (2013). https://doi.org/10.1007/s12010-012-9962-7
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DOI: https://doi.org/10.1007/s12010-012-9962-7