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Development of thermosensitive hydrogels of chitosan, sodium and magnesium glycerophosphate for bone regeneration applications.

Lisková J, Bačaková L, Skwarczyńska AL, Musial O, Bliznuk V, De Schamphelaere K, Modrzejewska Z, Douglas TE - J Funct Biomater (2015)

Bottom Line: Substitution of Na-β-GP with Mg-GP did not negatively influence mineralizability.Hence, chitosan/Na-β-GP/Mg-GP hydrogels can be used as an alternative to chitosan/Na-β-GP hydrogels for bone regeneration applications.However the incorporation of Mg in the hydrogels during hydrogel formation did not bring any appreciable physicochemical or biological benefit.

View Article: PubMed Central - PubMed

Affiliation: Department of Biomaterials and Tissue Engineering, Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, Prague, Czech Republic. janefox@biolog.cz.

ABSTRACT
Thermosensitive injectable hydrogels based on chitosan neutralized with sodium beta-glycerophosphate (Na-β-GP) have been studied as biomaterials for drug delivery and tissue regeneration. Magnesium (Mg) has been reported to stimulate adhesion and proliferation of bone forming cells. With the aim of improving the suitability of the aforementioned chitosan hydrogels as materials for bone regeneration, Mg was incorporated by partial substitution of Na-β-GP with magnesium glycerophosphate (Mg-GP). Chitosan/Na-β-GP and chitosan/Na-β-GP/Mg-GP hydrogels were also loaded with the enzyme alkaline phosphatase (ALP) which induces hydrogel mineralization. Hydrogels were characterized physicochemically with respect to mineralizability and gelation kinetics, and biologically with respect to cytocompatibility and cell adhesion. Substitution of Na-β-GP with Mg-GP did not negatively influence mineralizability. Cell biological testing showed that both chitosan/Na-β-GP and chitosan/Na-β-GP/Mg-GP hydrogels were cytocompatible towards MG63 osteoblast-like cells. Hence, chitosan/Na-β-GP/Mg-GP hydrogels can be used as an alternative to chitosan/Na-β-GP hydrogels for bone regeneration applications. However the incorporation of Mg in the hydrogels during hydrogel formation did not bring any appreciable physicochemical or biological benefit.

No MeSH data available.


Related in: MedlinePlus

TEM images of mineral deposits in lyophilized chitosan/Na-β-GP (a) and chitosan/Na-β-GP/Mg-GP (b) hydrogels containing 2.5 mg/mL ALP after incubation for 14 days in a simulated body fluid (SBF). SAED patterns of mineral deposits in lyophilized chitosan/Na-β-GP (c) and chitosan/Na-β-GP/Mg-GP (d) hydrogels.
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jfb-06-00192-f004: TEM images of mineral deposits in lyophilized chitosan/Na-β-GP (a) and chitosan/Na-β-GP/Mg-GP (b) hydrogels containing 2.5 mg/mL ALP after incubation for 14 days in a simulated body fluid (SBF). SAED patterns of mineral deposits in lyophilized chitosan/Na-β-GP (c) and chitosan/Na-β-GP/Mg-GP (d) hydrogels.

Mentions: TEM and SAED analysis (Figure 4) also demonstrated the presence of a crystalline phase. In chitosan/Na-β-GP hydrogels, needle-like crystals characteristic of calcium-deficient apatite were seen [24]. Diffraction rings corresponding to the (002) and (211) planes of apatite were observed [25,26]. In chitosan/Na-β-GP/Mg-GP hydrogels, needle-like crystals were also seen, however diffraction rings in the SAED pattern were less sharp, suggesting that the deposit analyzed may have been less crystalline.


Development of thermosensitive hydrogels of chitosan, sodium and magnesium glycerophosphate for bone regeneration applications.

Lisková J, Bačaková L, Skwarczyńska AL, Musial O, Bliznuk V, De Schamphelaere K, Modrzejewska Z, Douglas TE - J Funct Biomater (2015)

TEM images of mineral deposits in lyophilized chitosan/Na-β-GP (a) and chitosan/Na-β-GP/Mg-GP (b) hydrogels containing 2.5 mg/mL ALP after incubation for 14 days in a simulated body fluid (SBF). SAED patterns of mineral deposits in lyophilized chitosan/Na-β-GP (c) and chitosan/Na-β-GP/Mg-GP (d) hydrogels.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493507&req=5

jfb-06-00192-f004: TEM images of mineral deposits in lyophilized chitosan/Na-β-GP (a) and chitosan/Na-β-GP/Mg-GP (b) hydrogels containing 2.5 mg/mL ALP after incubation for 14 days in a simulated body fluid (SBF). SAED patterns of mineral deposits in lyophilized chitosan/Na-β-GP (c) and chitosan/Na-β-GP/Mg-GP (d) hydrogels.
Mentions: TEM and SAED analysis (Figure 4) also demonstrated the presence of a crystalline phase. In chitosan/Na-β-GP hydrogels, needle-like crystals characteristic of calcium-deficient apatite were seen [24]. Diffraction rings corresponding to the (002) and (211) planes of apatite were observed [25,26]. In chitosan/Na-β-GP/Mg-GP hydrogels, needle-like crystals were also seen, however diffraction rings in the SAED pattern were less sharp, suggesting that the deposit analyzed may have been less crystalline.

Bottom Line: Substitution of Na-β-GP with Mg-GP did not negatively influence mineralizability.Hence, chitosan/Na-β-GP/Mg-GP hydrogels can be used as an alternative to chitosan/Na-β-GP hydrogels for bone regeneration applications.However the incorporation of Mg in the hydrogels during hydrogel formation did not bring any appreciable physicochemical or biological benefit.

View Article: PubMed Central - PubMed

Affiliation: Department of Biomaterials and Tissue Engineering, Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, Prague, Czech Republic. janefox@biolog.cz.

ABSTRACT
Thermosensitive injectable hydrogels based on chitosan neutralized with sodium beta-glycerophosphate (Na-β-GP) have been studied as biomaterials for drug delivery and tissue regeneration. Magnesium (Mg) has been reported to stimulate adhesion and proliferation of bone forming cells. With the aim of improving the suitability of the aforementioned chitosan hydrogels as materials for bone regeneration, Mg was incorporated by partial substitution of Na-β-GP with magnesium glycerophosphate (Mg-GP). Chitosan/Na-β-GP and chitosan/Na-β-GP/Mg-GP hydrogels were also loaded with the enzyme alkaline phosphatase (ALP) which induces hydrogel mineralization. Hydrogels were characterized physicochemically with respect to mineralizability and gelation kinetics, and biologically with respect to cytocompatibility and cell adhesion. Substitution of Na-β-GP with Mg-GP did not negatively influence mineralizability. Cell biological testing showed that both chitosan/Na-β-GP and chitosan/Na-β-GP/Mg-GP hydrogels were cytocompatible towards MG63 osteoblast-like cells. Hence, chitosan/Na-β-GP/Mg-GP hydrogels can be used as an alternative to chitosan/Na-β-GP hydrogels for bone regeneration applications. However the incorporation of Mg in the hydrogels during hydrogel formation did not bring any appreciable physicochemical or biological benefit.

No MeSH data available.


Related in: MedlinePlus