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Novel in Vitro Model for Keratoconus Disease

Schepens Eye Research Institute/Massachusetts Eye and Ear, Department of Ophthalmology, Harvard Medical School, Boston, MA 02114, USA
Mechanical & Industrial Engineering, Northeastern University, Boston, MA 02115, USA
Author to whom correspondence should be addressed.
J. Funct. Biomater. 2012, 3(4), 760-775;
Received: 29 August 2012 / Revised: 9 October 2012 / Accepted: 24 October 2012 / Published: 13 November 2012
(This article belongs to the Special Issue Corneal Scarring: Wound Healing and Biomaterials)
PDF [6495 KB, uploaded 13 November 2012]


Keratoconus is a disease where the cornea becomes cone-like due to structural thinning and ultimately leads to compromised corneal integrity and loss of vision. Currently, the therapeutic options are corrective lenses for early stages and surgery for advanced cases with no in vitro model available. In this study, we used human corneal fibroblasts (HCFs) and compared them to human Keratoconus fibroblasts (HKCs) cultured in a 3-dimensional (3D) model, in order to compare the expression and secretion of specific extracellular matrix (ECM) components. For four weeks, the cells were stimulated with a stable Vitamin C (VitC) derivative ± TGF-β1 or TGF-β3 (T1 and T3, respectively). After four weeks, HKCs stimulated with T1 and T3 were significantly thicker compared with Control (VitC only); however, HCF constructs were significantly thicker than HKCs under all conditions. Both cell types secreted copious amounts of type I and V collagens in their assembled, aligned collagen fibrils, which increased in the degree of alignment upon T3 stimulation. In contrast, only HKCs expressed high levels of corneal scarring markers, such as type III collagen, which was dramatically reduced with T3. HKCs expressed α-smooth muscle actin (SMA) under all conditions in contrast to HCFs, where T3 minimized SMA expression. Fast Fourier transform (FFT) data indicated that HKCs were more aligned when compared to HCFs, independent of treatments; however, HKC’s ECM showed the least degree of rotation. HKCs also secreted the most aligned type I collagen under T3 treatment, when compared to any condition and cell type. Overall, our model for Keratoconus disease studies is the first 3D in vitro tissue engineered model that can mimic the Keratoconus disease in vivo and may be a breakthrough in efforts to understand the progression of this disease. View Full-Text
Keywords: Keratoconus disease; extracellular matrix; TGF-β3; fast fourier analysis; corneal fibroblasts Keratoconus disease; extracellular matrix; TGF-β3; fast fourier analysis; corneal fibroblasts

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Karamichos, D.; Zareian, R.; Guo, X.; Hutcheon, A.E.; Ruberti, J.W.; Zieske, J.D. Novel in Vitro Model for Keratoconus Disease. J. Funct. Biomater. 2012, 3, 760-775.

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J. Funct. Biomater. EISSN 2079-4983 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
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