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J Biomech. 2014 Nov 28;47(15):3712-8. doi: 10.1016/j.jbiomech.2014.09.018. Epub 2014 Oct 2.

Promoting increased mechanical properties of tissue engineered neocartilage via the application of hyperosmolarity and 4α-phorbol 12,13-didecanoate (4αPDD).

Author information

1
Department of Biomedical Engineering, University of California, One Shields Avenue, Davis, CA 95616, USA.
2
Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, 1089 Veterinary Medicine Drive, Davis, CA 95616, USA.
3
Department of Biomedical Engineering, University of California, One Shields Avenue, Davis, CA 95616, USA; Department of Orthopaedic Surgery, University of California, One Shields Avenue, Davis, CA 95616, USA. Electronic address: athanasiou@ucdavis.edu.

Abstract

Osteoarthritis, a degenerative disease of the load-bearing joints, greatly reduces quality of life for millions of Americans and places a tremendous cost on the American healthcare system. Due to limitations of current treatments, tissue engineering of articular cartilage may provide a promising therapeutic option to treat cartilage defects. However, cartilage tissue engineering has yet to recapitulate the functional properties of native tissue. During normal joint loading, cartilage tissue experiences variations in osmolarity and subsequent changes in ionic concentrations. Motivated by these known variations in the cellular microenvironment, this study sought to improve the mechanical properties of neocartilage constructs via the application of hyperosmolarity and transient receptor potential vanilloid 4 (TRPV4) channel activator 4α-phorbol 12,13-didecanoate (4αPDD). It was shown that 4αPDD elicited significant increases in compressive properties. Importantly, when combined, 4αPDD positively interacted with hyperosmolarity to modulate its effects on tensile stiffness and collagen content. Thus, this study supports 4αPDD-activated channel TRPV4 as a purported mechanosensor and osmosensor that can facilitate the cell and tissue level responses to improve the mechanical properties of engineered cartilage. To our knowledge, this study is the first to systematically evaluate the roles of hyperosmolarity and 4αPDD on the functional (i.e., mechanical and biochemical) properties of self-assembled neotissue. Future work may combine 4αPDD-induced channel activation with other chemical and mechanical stimuli to create robust neocartilages suitable for treatment of articular cartilage defects.

KEYWORDS:

Cartilage tissue engineering; Dynamic loading; Neocartilage; Scaffold-free; Self-assembly

PMID:
25442009
PMCID:
PMC5107315
DOI:
10.1016/j.jbiomech.2014.09.018
[Indexed for MEDLINE]
Free PMC Article

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