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The Sequence-Specific Cellular Uptake of Spherical Nucleic Acid Nanoparticle Conjugates
Suguna P Narayan1, Chung Hang J Choi2, Liangliang Hao3
1Department of Biomedical Engineering, International Institute of Nanotechnology, Northwestern University, Evanston, IL, 60208, USA.
Small (Weinheim an Der Bergstrasse, Germany)
|June 23, 2015
Summary
Spherical nucleic acid nanoparticle conjugates (SNAs) with high guanine content show enhanced cellular uptake. Guanine-rich SNAs effectively deliver drugs like camptothecin, increasing cytotoxicity in cancer cells.
Area of Science:
- Nanotechnology
- Biochemistry
- Molecular Biology
Background:
- Cellular uptake of spherical nucleic acid nanoparticle conjugates (SNAs) is sequence-dependent.
- Class A scavenger receptors (SR-A) and caveolae-mediated endocytosis mediate SNA internalization.
- Poly(guanine) (poly G) interacts with SR-A, potentially via G-quadruplex formation.
Purpose of the Study:
- To investigate the sequence-dependent cellular uptake of SNAs.
- To determine the effect of guanine (G) content on SNA cellular internalization.
- To evaluate the efficacy of G-rich SNAs for drug delivery and cancer cell cytotoxicity.
Main Methods:
- Cellular uptake assays measuring SNAs as a function of oligonucleotide sequence.
- Chemical conjugation of camptothecin to SNAs to create drug-SNA conjugates.
- Cytotoxicity assays on cancer cells treated with drug-SNA conjugates.
Main Results:
- SNAs with higher guanine content exhibited significantly increased cellular uptake.
- Poly G SNAs demonstrated superior delivery of camptothecin compared to other sequences.
- Guanine-rich drug-SNA conjugates showed the highest cytotoxicity in cancer cells.
Conclusions:
- Oligonucleotide sequence, particularly high guanine content, is a critical factor for enhancing SNA cellular delivery.
- G-rich SNAs are effective platforms for targeted drug delivery and increasing cancer cell cytotoxicity.
- These findings provide essential design principles for optimizing SNAs in nanomedicine applications.
