Abstract
Background
CD44 and RHAMM hyaluronan (HA) receptors have been studied in several systemic diseases such as osteoarthritis and cancer. However, not too much is known about their role in ocular surface disorders. The purpose of this research was to determine if CD44 and RHAMM are implicated in human ocular surface inflammation.
Methods
Upper tarsal conjunctival epithelial samples from patients with active ocular surface inflammation (n = 17) and healthy controls (n = 14) were recovered by brush cytology. Patients were evaluated by an ophthalmologist and classified in different groups according to the etiology (immune atopic diseases or immune non-atopic diseases) and inflammation intensity (mild/moderate or severe). CD44, RHAMM, and p53 mRNAs were measured using real-time PCR.
Results
CD44, RHAMM, and p53 mRNAs were detected in all samples. In immune atopic diseases, higher levels of CD44 and RHAMM mRNAs were present, reaching a 300 % increase for RHAMM in severe inflammation (p < 0.001). In contrast, in immune non-atopic diseases, the HA receptors were downregulated. CD44 tended to decrease up to 30 % in severe patients (p = 0.06), and RHAMM decreased 40 % in severe inflammation (p = 0.021).
Conclusions
RHAMM may be implicated in severe ocular surface inflammation affecting the upper tarsal conjunctiva.
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Acknowledgments
Authors thank Dr. José M. Herreras, MD, PhD for helping in patient recruitment, Sonia Villarón, MD, Darío Victoria, MD and Beatriz Ramirez, MD for technical assistance in obtaining brush cytology samples. We also thank Itziar Fernández (IOBA-University of Valladolid) for statistical advice. The authors also acknowledge the assistance of Britt Bromberg, PhD, ELS, of Xenofile Editing (http://www.xenofileediting.com) for the final editing and preparation of this manuscript.
Grants
This work was supported by FEDER-CICYT Grant MAT-2010-20452-C03-01 and FPI Scholarship program (Ministry of Science and Innovation, Spain) and Regional JCyL Grant VA132A11-2.
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Authors have full control of all primary data, and agree to allow Graefe's Archive for Clinical and Experimental Ophthalmology to review their data upon request.
This study was partially presented at 2012 ARVO Annual Meeting (Fort Lauderdale, FL, USA).
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García-Posadas, L., Contreras-Ruiz, L., Arranz-Valsero, I. et al. CD44 and RHAMM hyaluronan receptors in human ocular surface inflammation. Graefes Arch Clin Exp Ophthalmol 252, 1289–1295 (2014). https://doi.org/10.1007/s00417-014-2686-3
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DOI: https://doi.org/10.1007/s00417-014-2686-3