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World J Stem Cells. 2012 Sep 26;4(9):94-100. doi: 10.4252/wjsc.v4.i9.94.

Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) supports adhesion and migration of mesenchymal stem cells and tenocytes.

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1
Alex J Lomas, Alicia J El Haj, Nicholas R Forsyth, Guy Hilton Research Centre, Keele University, Stoke on Trent, ST4 7QB, United Kingdom.

Abstract

AIM:

To establish the potential of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) as a material for tendon repair.

METHODS:

The biocompatibility of PHBHHx with both rat tenocytes (rT) and human mesenchymal stem cells (hMSC) was explored by monitoring adhesive characteristics on films of varying weight/volume ratios coupled to a culture atmosphere of either 21% O(2) (air) or 2% O(2) (physiological normoxia). The diameter and stiffness of PHBHHx films was established using optical coherence tomography and mechanical testing, respectively.

RESULTS:

Film thickness correlated directly with weight/volume PHBHHx (r(2) = 0.9473) ranging from 0.1 mm (0.8% weight/volume) to 0.19 mm (2.4% weight/volume). Film stiffness on the other hand displayed a biphasic response which increased rapidly at values > 1.6% weight/volume. Optimal cell attachment of rT required films of ≥ 1.6% and ≥ 2.0% weight/volume PHBHHx in 2% O(2) and 21% O(2) respectively. A qualitative adhesion increase was noted for hMSC in films ≥ 1.2% weight/volume, becoming significant at 2% weight/volume in 2% O(2). An increase in cell adhesion was also noted with ≥ 2% weight/volume PHBHHx in 21% O(2). Cell migration into films was not observed.

CONCLUSION:

This evaluation demonstrates that PHBHHx is a suitable polymer for future cell/polymer replacement strategies in tendon repair.

KEYWORDS:

Hypoxia; Mesenchymal stem cell; Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate); Polyhydroxyalkanoates; Tenocytes

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