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Peptides from Phage Display Library Modulate Gene Expression in Mesenchymal Cells and Potentiate Osteogenesis in Unicortical Bone Defects

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Published on: December 10, 2010

Dipeptide-based polyphosphazene and polyester blends for bone tissue engineering.

Meng Deng¹, Lakshmi S Nair, Syam P Nukavarapu

¹Department of Orthopaedic Surgery, University of Connecticut, Farmington, CT 06030-3800, USA.

|March 26, 2010

Summary

New polyphosphazene-polyester blends offer enhanced bone tissue engineering solutions. These materials exhibit improved mechanical properties, controlled degradation, and superior osteoblast growth compared to traditional polyesters.

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Area of Science:

Biomaterials Science
Tissue Engineering
Polymer Chemistry

Background:

Polyphosphazene-polyester blends are promising for bone tissue engineering due to tunable degradation and neutral byproducts.
Developing fully miscible blend systems remains a key challenge.

Purpose of the Study:

To synthesize and characterize a novel mixed-substituent biodegradable polyphosphazene, poly[(glycine ethyl glycinato)(1)(phenyl phenoxy)(1)phosphazene] (PNGEG/PhPh).
To evaluate blends of PNGEG/PhPh with poly(lactic acid-glycolic acid) (PLAGA) for bone tissue engineering applications.

Main Methods:

Synthesis and characterization of PNGEG/PhPh and its blends with PLAGA at 25:75 (Matrix1) and 50:50 (Matrix2) weight ratios.
Miscibility assessment using differential scanning calorimetry, Fourier transform infrared spectroscopy, and scanning electron microscopy.
Evaluation of mechanical properties, degradation behavior in vitro, and osteoblast cell response in vitro and in vivo.

Main Results:

Blend miscibility was confirmed by multiple analytical techniques.
The blends exhibited superior tensile modulus and strength compared to PLAGA.
Degradation rates followed the order Matrix2 < Matrix1 < PLAGA, with blends showing higher pH stability.
Blends promoted significantly higher osteoblast growth rates and maintained cell phenotype.
In vivo studies demonstrated improved biocompatibility of the blends compared to PLAGA.

Conclusions:

The synthesized PNGEG/PhPh and its blends with PLAGA are suitable for bone tissue engineering.
These blends offer enhanced mechanical strength, controlled degradation, and improved biological performance.
The neutralization of acidic degradation products by polyphosphazene hydrolysis contributes to a more favorable cellular environment.