Journal
CARBOHYDRATE POLYMERS
Volume 136, Issue -, Pages 1017-1026Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2015.09.095
Keywords
Hyaluronic acid; Poly(N-epsilon-acryloyl-L-lysine); Hydrogel; Bone tissue engineering; Biomaterials
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Funding
- National Natural Science Foundation of China [50773062, 50603020]
- Natural Science Basic Research Plan in Shaanxi Province of China [2013K09-27]
- Fundamental Research Funds for the Central Universities [XJJ2014124, XJJ2013130]
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In the present study, poly(N-epsilon-acryloyl-L-lysine)/hyaluronic acid (pLysAAm/HA) interpenetrating network (IPN) hydrogels were successfully fabricated through the combination of hydrazone bond crosslinking and photo-crosslinking reactions. The HA hydrogel network was first synthesized from 3,3'-dithiodipropionate hydrazide-modified HA and polyethylene glycol dilevulinate by hydrazone bond crosslinking. The pLysAAm hydrogel network was prepared from N-epsilon-acryloyl-L-lysine and N,N'-bis(acryloyl)-(L)-cystine by photo-crosslinking. The resultant pLysAAm/HA hydrogels had a good shape recovery property after loading and unloading for 1.5 cycles (up to 90%) and displayed a highly porous microstructure. Their compressive moduli were at least 5 times higher than that of HA hydrogels. The pLysAAm/HA hydrogels had an equilibrium swelling ratio of up to 37.9 and displayed a glutathione-responsive degradation behavior. The results from in vitro biocompatibility evaluation with pre-osteoblasts MC3T3-E1 cells revealed that the pLysAAm/HA hydrogels could support cell viability and proliferation. Hematoxylin and eosin staining indicated that the pLysAAm/HA hydrogels allowed cell and tissue infiltration, confirming their good in vivo biocompatibility. Therefore, the novel pLysAAm/HA IPN hydrogels have great potential for bone tissue engineering applications. (C) 2015 Elsevier Ltd. All rights reserved.
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