Evaluation of the matrix-synthesis potential of crosslinked hyaluronan gels for tissue engineering of aortic heart valves

Biomaterials
A Ramamurthi, I Vesely

Abstract

Our goal is to fabricate continuous sheets of elastin atop non-biodegradable hydrogels (hylans) containing crosslinked hyaluronan, a glycosaminoglycan. Such elastin-hyaluronan composites may be useful to tissue engineer replacements for the glycosaminoglycan- and elastin-rich layers of the native aortic valve cusp. Neonatal rat aortic smooth muscle cells were cultured atop hylan gels with micro-textured surfaces, and on plastic, and the components of the extracellular matrix (collagen, elastin) were periodically analyzed. The hylan substrates induced the cells to proliferate more rapidly and over longer time periods (approximately 4 weeks) relative to those cultured on plastic (2-3 weeks). Consequently, at all assay times, the amounts of elastin was derived from the hylan-based cell cultures was 25% or more than that derived from cells cultured on plastic. However, when elastin content was normalized to the cell DNA content, no significant differences were found in the two substrates beyond the first two weeks of culture. Conversely, at culture times greater than 2 weeks, cells cultured atop hylan gels produced amounts of collagen/nanogram of DNA that were approximately 56% less than that synthesized by cells cultured on plasti...Continue Reading

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