Abstract
Therapies for atherosclerotic cardiovascular disease should target early disease stages and specific vascular sites where disease occurs. Endothelial glycocalyx (GCX) degradation compromises endothelial barrier function and increases vascular permeability. This initiates pro-atherosclerotic lipids and inflammatory cells to penetrate vessel walls, and at the same time this can be leveraged for targeted drug delivery. In prior cell culture studies, GCX degradation significantly increased endothelial cell uptake of nanoparticle vehicles that are designed for drug delivery, compared to the effects of intact GCX. The present study assessed if the cell culture findings translate to selective nanoparticle uptake in animal vessels. In mice, the left carotid artery (LCA) was partially ligated to disturb blood flow, which induces GCX degradation, endothelial dysfunction, and atherosclerosis. After ligation, the LCA vessel wall exhibited a loss of continuity of the GCX layer on the intima. 10-nm gold nanospheres (GNS) coated with polyethylene glycol (PEG) were delivered intravenously. GCX degradation in the ligated LCA correlated to increased GNS infiltration of the ligated LCA wall. This suggests that GCX dysfunction, which coincides with atherosclerosis, can indeed be targeted for enhanced drug delivery, offering a new approach in cardiovascular disease therapy.
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Abbreviations
- ANOVA:
-
Analysis of variance
- BSA:
-
Bovine serum albumin
- DAPI:
-
4′,6-diamidino-2-phenylindole
- DLS:
-
Dynamic light scattering
- ECA:
-
External carotid artery
- EGM-2:
-
Endothelial cell growth medium-2
- GCX:
-
Glycocalyx
- GNS:
-
Gold nanospheres
- HepIII:
-
Heparinase III
- HS:
-
Heparan sulfate
- HUVEC:
-
Human umbilical vein endothelial cells
- IACUC:
-
Institutional Animal Care and Use Committee
- ICA:
-
Internal carotid artery
- LCA:
-
Left carotid artery
- NHS:
-
N-Hydroxysuccinimide
- OA:
-
Occipital artery
- OCT:
-
Optimal cutting temperatire
- PBS:
-
Phosphate buffered saline
- PEG:
-
Polyethylene glycol
- RCA:
-
Right carotid artery
- SEM:
-
Standard error of the mean
- SH–PEG–COOH:
-
PEG with a thiol (SH) group and a carboxyl (COOH) group
- SH–PEG–NH2 :
-
PEG with a thiol (SH) group and an amide (NH2) group
- SH–PEG–OCH3 :
-
PEG with a thiol (SH) group and a methoxy (OCH3) group
- TEM:
-
Transmission electron microscopy
- THPC:
-
Tetrakis-(hydroxymethyl)-phosphonium chloride
- TSA:
-
Tyramide signal amplification
- WGA:
-
Wheat germ agglutinin
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Acknowledgements
Solomon Mensah, Bijay Singh, Maeve X Enright, Paige Baldwin, Bailey L Ritchie, and James Lister of Northeastern University provided technical assistance and feedback. Northeastern University’s Professor Thomas Webster, Professor Heather Clark, Assistant Professor Adam Ekenseair, the Department of Physics, and the Electronic Materials Research Institute shared equipment.
Author Contributions
All authors contributed to data analysis, drafted and revised the article, and gave final approval of the version to be published. Specifically: M.J.C. and E.E.E. designed the experiments. M.J.C, R.M., C.C.O., A.A.N., I.C.H, and R.K. performed the experiments and analyzed the data. M.J.C. and E.E.E. interpreted the results of the experiments. M.J.C., R.M., N.N.B, and E.E.E drafted the figures and manuscript. M.J.C., R.M., C.C.O., A.A.N., I.C.H, N.N.B, R.K., H.J., S.S., and E.E.E. edited, revised, and approved the final manuscript. H.J., S.S., and E.E.E. supervised the project. All authors agree to be accountable for all aspects of the work.
Funding
This work was funded by the National Institutes of Health (K01 HL125499 granted to EEE), the National Science Foundation (DGE-0965843 granted to SS and CMMI-1846962 granted to EEE), and the American Heart Association (18PRE33960461 granted to ICH). The funders had no role in data or information collection and analysis, decision to publish, or preparation of the manuscript.
Conflict of interest
Ming Cheng, Chinedu Okorafor, Alina Nersesyan, Ian Harding, Nandita Bal, Rajiv Kumar, Hanjoong Jo, Srinivas Sridhar, and Eno Ebong declare that they have no conflict of interest.
Research Involving Human and Animal Rights
No human studies were carried out by the authors for this article. All institutional and national guidelines for the care and use of laboratory animals were followed and approved by the appropriate institutional committees.
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Cheng, M.J., Mitra, R., Okorafor, C.C. et al. Targeted Intravenous Nanoparticle Delivery: Role of Flow and Endothelial Glycocalyx Integrity. Ann Biomed Eng 48, 1941–1954 (2020). https://doi.org/10.1007/s10439-020-02474-4
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DOI: https://doi.org/10.1007/s10439-020-02474-4