Abstract
Tissue transglutaminase (tTG) is a multifunctional enzyme with a plethora of potential applications in regenerative medicine and tissue bioengineering. In this study, we examined the role of tTG as a regulator of chondrogenesis in human mesenchymal stem cells (MSC) using nanofibrous scaffolds coated with collagen type XI. Transient treatment of collagen type XI films and 3D scaffolds with tTG results in enhanced attachment of MSC and supports rounded cell morphology compared to the untreated matrices or those incubated in the continuous presence of tTG. Accordingly, enhanced cell aggregation and augmented chondrogenic differentiation have been observed on the collagen type XI-coated poly- (L-lactide) nanofibrous scaffolds treated with tTG prior to cell seeding. These changes implicate that MSC chondrogenesis is enhanced by the tTG-mediated modifications of the collagen matrix. For example, exogenous tTG increases resistance to collagenolysis in collagen type XI matrices by catalyzing intermolecular cross-linking, detected by a shift in the denaturation temperature. In addition, tTG auto-crosslinks to collagen type XI as detected by western blot and immunofluorescent analysis. This study identifies tTG as a novel regulator of MSC chondrogenesis further contributing to the expanding use of these cells in cartilage bioengineering.
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Abbreviations
- BSA:
-
Bovine serum albumin
- Ca2+ :
-
Calcium
- CO2 :
-
Carbon dioxide
- cont-tTG:
-
Collagen type XI films continuously treated with tTG
- pre-TG:
-
Collagen type XI films pre-treated with tTG
- DSC:
-
Differential scanning calorimetry
- DMEM:
-
Dulbecco’s modified eagle medium
- EDTA:
-
Ethylenediaminetetraacetic acid
- MSC:
-
Human mesenchymal stem cells
- HCl:
-
Hydrochloric acid
- PFA:
-
Paraformaldehyde
- PBS:
-
Phosphate buffered saline
- PLLA-coll XI:
-
PLLA scaffold coated with collagen type XI
- coll XI-pre tTG:
-
PLLA-coll XI pre-treated with tTG
- coll XI-cont tTG:
-
PLLA-coll XI in the continuous presence of tTG
- PLLA:
-
Poly (L-lactide)
- GAG:
-
Sulphated glycosaminoglycan
- 3D:
-
Three- dimensional
- tTG:
-
Tissue transglutaminase
- 2D:
-
Two-dimensional
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Acknowledgments
We would like to thank Dr. Kimberly Griswold, of Picatinny Arsenal, NJ for DSC measurements. Also, Dr. Michael Jaffe and Dr. George Collins of New Jersey Institute of Technology, NJ for helpful discussions on DSC data. This work was supported by NIH grants R56DK071920 and R03AR057126 and a grant from Maryland Stem Cell Research Fund to M. Nurminskaya.
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The authors declare that they have no conflict of interest.
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S. Shanmugasundaram, S. Logan-Mauney contributed equally.
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Shanmugasundaram, S., Logan-Mauney, S., Burgos, K. et al. Tissue transglutaminase regulates chondrogenesis in mesenchymal stem cells on collagen type XI matrices. Amino Acids 42, 1045–1053 (2012). https://doi.org/10.1007/s00726-011-1019-7
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DOI: https://doi.org/10.1007/s00726-011-1019-7