Regeneration of elastic fibers by three-dimensional culture on a collagen scaffold and the addition of latent TGF-ß binding protein 4 to improve elastic matrix deposition.

Biomaterials

PubMedID: 26342558

Aya R, Ishiko T, Noda K, Yamawaki S, Sakamoto Y, Tomihata K, Katayama Y, Yoshikawa K, Kubota H, Nakamura T, Naitoh M, Suzuki S. Regeneration of elastic fibers by three-dimensional culture on a collagen scaffold and the addition of latent TGF-ß binding protein 4 to improve elastic matrix deposition. Biomaterials. 2015;7229-37.
The objective of this study was to investigate the effects of latent TGF-ß binding protein 4 (LTBP-4) on elastic fiber regeneration in three-dimensional cultures of human dermal fibroblasts (HDFs). Appropriate collagen scaffold for elastic fiber regeneration was also examined. Collagen sponges cross-linked at 120 °C and composed of small pores (25 µm on average) was favorable for elastic fiber regeneration by HDFs. Addition of LTBP-4, followed by culture for 21 days, accelerated elastic fiber accumulation within the scaffolds. Conditioned scaffolds containing either HDFs or LTBP-4-built mature elastic fibers were implanted between the dermis and the cutaneous muscle of mice. The combined use of HDFs and LTBP-4 resulted in thicker tissues containing elastic fibers. These results indicate that weakly cross-linked collagen sponges can be used as scaffolds for regenerating elastic fibers both in vitro and in vivo, and that the addition of LTBP-4 accelerates the deposition of both elastin and fibrillin-1, and increases cell proliferation. These techniques may be useful for generating cutaneous or cardiovascular tissue equivalents; furthermore, they may serve as a useful method for the three-dimensional analyses of drugs used to treat skin diseases or to examine the microstructure of elastin networks.