| Fluorophotometric measurement of the precorneal residence time of topically applied hyaluronic acid. | |
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MedLine Citation:
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PMID: 18156377 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: This study was performed to separately assess the aqueous flow applied with hyaluronic acid, and the behaviour of hyaluronic acid itself on the ocular surface. METHODS: Two different fluorescent dyes, fluorescein sodium dissolved in 0.1% hyaluronic acid (HA) solution and 0.1% fluorescein conjugated with hyaluronic acid (F-HA) dissolved in saline, were used. A volume of 20 mul of tested solution was applied to the eye of 10 healthy volunteers. Fluorescein sodium dissolved in saline served as a control. The fluorescent intensity of the precorneal tear film was measured at the central cornea every minute for 10 min. The turnover rate was calculated using the equation that plots fluorescent intensity against time in a semilog plot and expressed as %/min. RESULTS: Turnover rates of topically applied 0.1% F-HA, 0.1% HA and saline were 8.1 (SD 3.6)%/min, 21.6 (2.8)%/min, and 31.0 (3.7)%/min, respectively. The turnover rate of F-HA was significantly lower than those of HA and saline (p = 0.00012 and p = 0.00000022, respectively; Mann-Whitney test). The turnover rate of HA was significantly lower than that of saline (p = 0.00001; Mann-Whitney test). CONCLUSION: Our results indicate that the bulk aqueous flow applied with HA and the turnover of HA itself are different. HA molecules may adhere to the ocular surface by surface-chemical and/or biochemical properties. The long retention time of HA on the ocular surface may explain the mechanism in which hyaluronic acid has been shown to enhance tear film stability for a few hours. |
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Authors:
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H Mochizuki; M Yamada; S Hato; T Nishida |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The British journal of ophthalmology Volume: 92 ISSN: 1468-2079 ISO Abbreviation: Br J Ophthalmol Publication Date: 2008 Jan |
Date Detail:
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Created Date: 2007-12-24 Completed Date: 2008-01-18 Revised Date: 2008-05-28 |
Medline Journal Info:
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Nlm Unique ID: 0421041 Medline TA: Br J Ophthalmol Country: England |
Other Details:
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Languages: eng Pagination: 108-11 Citation Subset: IM |
Affiliation:
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Division for Vision Research, National Institute of Sensory Organs, National Tokyo Medical Center, 2-5-1 Higashigaoka, Meguro, Tokyo 152-8902, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Female Fluorescein / diagnostic use Fluorophotometry / methods Humans Hyaluronic Acid / pharmacokinetics*, pharmacology Male Ophthalmic Solutions Tears / drug effects, metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Ophthalmic Solutions; 2321-07-5/Fluorescein; 9004-61-9/Hyaluronic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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