Yang Liu1, Di Chen2, Xiaomin Chen3, Wendy R Kam4, Mark P Hatton5, David A Sullivan4. 1. Schepens Eye Research Institute, Massachusetts Eye and Ear, and Department of Ophthalmology, Harvard Medical School, Boston, 02114, USA. Electronic address: Yang_Liu@meei.harvard.edu. 2. Schepens Eye Research Institute, Massachusetts Eye and Ear, and Department of Ophthalmology, Harvard Medical School, Boston, 02114, USA; Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100730, China. 3. Schepens Eye Research Institute, Massachusetts Eye and Ear, and Department of Ophthalmology, Harvard Medical School, Boston, 02114, USA; Zhongnan Hospital, Wuhan University, Wuhan, China. 4. Schepens Eye Research Institute, Massachusetts Eye and Ear, and Department of Ophthalmology, Harvard Medical School, Boston, 02114, USA. 5. Schepens Eye Research Institute, Massachusetts Eye and Ear, and Department of Ophthalmology, Harvard Medical School, Boston, 02114, USA; Ophthalmic Consultants of Boston, Boston, 02114, USA.
Abstract
PURPOSE: Optimal meibomian gland (MG) function is critically important for the health and wellbeing of the ocular surface. We hypothesize that low oxygen (O2) conditions promote the function of human MG epithelial cells (HMGECs) and that human MGs exist in a relatively hypoxic environment. The purpose of this study was to test our hypotheses. METHODS: We used human and mouse eyelid segments, and immortalized human MG epithelial cells (IHMGECs) in our studies. To evaluate oxygen (O2) levels in the mouse MG and vicinity, we injected pimonidazole (pimo), a hypoxia marker, before sacrifice. Human eyelid samples were stained with the hypoxia marker glucose transporter 1 (Glut-1). To determine the effect of low O2 levels on IHMGECs, we cultured cells under proliferating and differentiating conditions in both normoxic (21% O2) and hypoxic (3% O2) conditions for 5-15 days. IHMGECs were evaluated for cell number, neutral lipid content, lysosome accumulation, expression of biomarker proteins and DNase II activity. RESULTS: Our results demonstrate that human and mouse MGs, but not the surrounding connective tissue, exist in a relatively hypoxic environment in vivo. In addition, our findings show that hypoxia does not influence IHMGEC numbers in basal or proliferating culture conditions, but does stimulate the expression of SREBP-1 in differentiating IHMGECs. Hypoxia also significantly increased DNase II activity, and apparently IHMGEC terminal differentiation. CONCLUSIONS: Our Results support our hypotheses, and indicate that relative hypoxia promotes MG function.
PURPOSE: Optimal meibomian gland (MG) function is critically important for the health and wellbeing of the ocular surface. We hypothesize that low oxygen (O2) conditions promote the function of human MG epithelial cells (HMGECs) and that humanMGs exist in a relatively hypoxic environment. The purpose of this study was to test our hypotheses. METHODS: We used human and mouse eyelid segments, and immortalized human MG epithelial cells (IHMGECs) in our studies. To evaluate oxygen (O2) levels in the mouse MG and vicinity, we injected pimonidazole (pimo), a hypoxia marker, before sacrifice. Human eyelid samples were stained with the hypoxia marker glucose transporter 1 (Glut-1). To determine the effect of low O2 levels on IHMGECs, we cultured cells under proliferating and differentiating conditions in both normoxic (21% O2) and hypoxic (3% O2) conditions for 5-15 days. IHMGECs were evaluated for cell number, neutral lipid content, lysosome accumulation, expression of biomarker proteins and DNase II activity. RESULTS: Our results demonstrate that human and mouseMGs, but not the surrounding connective tissue, exist in a relatively hypoxic environment in vivo. In addition, our findings show that hypoxia does not influence IHMGEC numbers in basal or proliferating culture conditions, but does stimulate the expression of SREBP-1 in differentiating IHMGECs. Hypoxia also significantly increased DNase II activity, and apparently IHMGEC terminal differentiation. CONCLUSIONS: Our Results support our hypotheses, and indicate that relative hypoxia promotes MG function.
Authors: Kelly K Nichols; Gary N Foulks; Anthony J Bron; Ben J Glasgow; Murat Dogru; Kazuo Tsubota; Michael A Lemp; David A Sullivan Journal: Invest Ophthalmol Vis Sci Date: 2011-03-30 Impact factor: 4.799
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