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Published on: December 27, 2013
Poly(γ-glutamic acid)-thickened PLLA microspheres with enhanced biocompatibility and efficacy in aged mice
Dan-Qi Ren1, Hui-Zhen Peng1, Yue Zhang1
1Institute of International Rivers and Eco-security, Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, School of Pharmacy, Yunnan University, Yunnan Characteristic Plant Extraction Laboratory Co., Ltd, Southwest United Graduate School, Kunming, 650500, China. xdluo@ynu.edu.cn.
A new Poly(L-lactic acid)-poly(γ-glutamic acid) (PLLA-γ-PGA) microsphere formulation shows enhanced skin rejuvenation effects. This regenerative material demonstrated superior biocompatibility and efficacy compared to existing fillers in aged mice.
Area of Science:
- Biomaterials Science
- Dermatology
- Regenerative Medicine
Background:
- Poly(L-lactic acid) (PLLA) microspheres are utilized in aesthetic and regenerative medicine for collagen remodeling.
- Limited experimental data exist regarding the long-term efficacy and safety of PLLA microspheres.
- A need for improved formulations with enhanced biocompatibility and sustained effects is recognized.
Purpose of the Study:
- To develop and evaluate a novel poly(γ-glutamic acid)-thickened PLLA microsphere formulation (PLLA-γ-PGA).
- To assess the biocompatibility and efficacy of PLLA-γ-PGA in an aged mice model.
- To compare the performance of PLLA-γ-PGA against marketed hyaluronic acid (HA) fillers and PLLA-carboxymethyl cellulose sodium (PLLA-CMC) formulations.
Main Methods:
- Development of a PLLA-γ-PGA microsphere formulation.
- Induction of skin aging in mice using subcutaneous D-galactose and UV irradiation.
- Subcutaneous injection of PLLA-γ-PGA, HA, and PLLA-CMC in the aged mice model.
- Evaluation of dermal fibroblast activation, tissue remodeling, and inflammatory responses.
Main Results:
- PLLA-γ-PGA significantly enhanced dermal fibroblast activation.
- The formulation promoted sustained tissue remodeling with milder inflammatory responses.
- PLLA-γ-PGA demonstrated superior performance compared to HA fillers and PLLA-CMC formulations.
- No observable adverse effects were noted with the PLLA-γ-PGA formulation.
Conclusions:
- PLLA-γ-PGA is a safe and efficacious regenerative material for skin rejuvenation.
- The formulation offers robust preclinical evidence for translational potential.
- PLLA-γ-PGA represents an advancement over existing PLLA-based dermal fillers.
