Abstract
The natural healing process for tendon repair is associated with high upregulation of collagen type III, leading to scar tissue and tendon adhesions with functionally deficient tendons. Gene delivery systems are widely reported as potential nanotherapeutics to treat diseases, providing a promising approach to modulate collagen type III synthesis. This work investigates a proof-of-concept four-arm cationic polymer-siRNA polyplex to mediate a transient downregulation of collagen type III expression in a tendon cell culture system. The tendon culture system was first supplemented with TGF-β1 to stimulate the upregulation of collagen type III prior to silencing experiments. The four-arm poly[2-(dimethylamino) ethyl acrylate] (PDMAEA) polymer was successfully synthesized via RAFT polymerization and then mixed with siRNA to formulate the PDMAEA-siRNA polyplexes. The formation of the polyplex was optimized for the N:P ratio (10:1) and confirmed by agarose gel electrophoresis. The size and solution behavior of the polyplex were analyzed by dynamic light scattering and zeta potential, showing a hydrodynamic diameter of 155 ± 21 nm and overall positive charge of +30 mV at physiological pH. All the polyplex concentrations used had a minimal effect on the metabolic activity of cultured cells, indicating good biocompatibility. The dose and time effects of the TGF-β1 on collagen type III gene expressions were analyzed by qPCR, showing an optimal dose of 10 ng mL–1 TGF-β1 and 3-fold increase of COL3α1 expression at 48 h in cultured tenocytes. The PDMAEA-siRNA polyplex concept observed a limited yet successful and promising efficiency in silencing collagen type III at 48 h compared to PEI-siRNA. Therefore, this concept is a promising approach to reduce tissue scarring and adhesion following injuries.
Original language | English |
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Pages (from-to) | 1496-1505 |
Number of pages | 10 |
Journal | ACS Omega |
Volume | 5 |
Issue number | 3 |
Early online date | 15 Jan 2020 |
DOIs | |
Publication status | Published - 28 Jan 2020 |
Keywords
- BIOLOGY
- CELLULAR UPTAKE
- DIFFERENTIATION
- FIBROBLASTS
- LIGAMENT
- REPAIR
- SURFACE-CHARGE
- TENDON INJURY
- TRANSFECTION
Profiles
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Andrew Mayes
- School of Chemistry, Pharmacy and Pharmacology - Emeritus Professor
- Chemistry of Materials and Catalysis - Member
Person: Honorary, Research Group Member
-
Aram Saeed
- School of Chemistry, Pharmacy and Pharmacology - Associate Professor in Healthcare Technologies
- Pharmaceutical Materials and Soft Matter - Member
Person: Research Group Member, Academic, Teaching & Research