Abstract
Purpose
Delivery of therapeutics to neurons is paramount to treat neurological conditions, including many lysosomal storage disorders. However, key aspects of drug-carrier behavior in neurons are relatively unknown: the occurrence of non-canonical endocytic pathways (present in other cells); whether carriers that traverse the blood–brain barrier are, contrarily, retained within neurons; if neuron-surface receptors are accessible to bulky carriers compared to small ligands; or if there are differences regarding neuronal compartments (neuron body vs. neurites) pertaining said parameters. We have explored these questions using model polymer nanocarriers targeting intercellular adhesion molecule-1 (ICAM-1).
Methods
Differentiated human neuroblastoma cells were incubated with anti-ICAM-coated polystyrene nanocarriers and analyzed by fluorescence microscopy.
Results
ICAM-1 expression and nanocarrier binding was enhanced in altered (TNFα) vs. control conditions. While small ICAM-1 ligands (anti-ICAM) preferentially accessed the cell body, anti-ICAM nanocarriers bound with faster kinetics to neurites, yet reached similar saturation over time. Anti-ICAM nanocarriers were also endocytosed with faster kinetics and lower saturation levels in neurites. Non-classical cell adhesion molecule (CAM) endocytosis ruled uptake, and neurite-to-cell body transport was inferred. Nanocarriers trafficked to lysosomes, delivering active enzymes (dextranase) with substrate reduction in a lysosomal-storage disease model.
Conclusion
ICAM-1-targeting holds potential for intracellular delivery of therapeutics to neurons.
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Abbreviations
- BBB:
-
Blood–brain barrier
- Bmax:
-
Maximal binding
- FBS:
-
Fetal bovine serum
- FITC:
-
Fluorescein isothiocyanate
- ICAM-1:
-
Intercellular adhesion molecule-1
- IgG:
-
Immunoglobulin G
- Imax:
-
Maximal internalization
- LSD:
-
Lysosomal storage disorder
- MDC:
-
Monodansylcadaverine
- NC:
-
Nanocarrier
- PBS:
-
Phosphate buffer saline
- PDI:
-
Polydispersity index
- Tmax:
-
Maximal transport to lysosomes.
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ACKNOWLEDGMENTS AND DISCLOSURES
The authors thank Dr. Estrella Rubio Solsona (Program in Rare and Genetic Diseases & IBV/CSIC Associated Unit, Centro de Investigación Príncipe Felipe, Valencia, Spain) for her guidance in propagating and differentiating SH-SY5Y cells. We also thank Rachel Manthe (Department of Bioengineering, University of Maryland, College Park, MD, USA) for help with grammar edits. This work was supported by NIH grant R01-HL09816 and NSF award CBET-1402756 (S.M.).
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Hsu, J., Hoenicka, J. & Muro, S. Targeting, Endocytosis, and Lysosomal Delivery of Active Enzymes to Model Human Neurons by ICAM-1-Targeted Nanocarriers. Pharm Res 32, 1264–1278 (2015). https://doi.org/10.1007/s11095-014-1531-z
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DOI: https://doi.org/10.1007/s11095-014-1531-z