J Korean Ophthalmol Soc.
2006 Nov;47(11):1720-1728.
Topical 0.1% Prednisolone Lowers Nerve Growth Factor Expression in Keratoconjunctivitis Sicca Patients
- Affiliations
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- 1The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea. eungkkim@yumc.yonsei.ac.kr
- 2Department of Pathology, Yonsei University College of Medicine, Seoul, Korea.
- 3Department of Preventive Medicine and Public Health, Yonsei University College of Medicine, Seoul, Korea.
Abstract
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PURPOSE: To compare nerve growth factor (NGF) levels in tears and on the ocular surface of normal controls with those of non-Sjogren type keratoconjunctivitis sicca (KCS) subjects, and investigate the effect of 0.1% prednisolone eye drops on NGF levels in KCS patients.
METHODS
Baseline tear NGF levels were measured in 41 KCS patients and 23 healthy control subjects using enzyme-linked immunosorbent assays (ELISA). KCS patients received 0.1% prednisolone drops in one eye, and 0.1% hyaluronic acid drops in the other eye, three times daily for 28 days. Impression cytology (IC) and immunostaining for NGF on conjunctival epithelium was performed for both groups.
RESULTS
KCS patients were found to have higher baseline tear NGF concentrations compared to age- and sex-matched healthy control subjects (65.9+/-14.5 vs. 122.1+/-45.3, p<0.0001). In KCS patients, prednisolone treatment for 28 days resulted in a decrease in tear NGF levels, symptom scores and IC scores, whereas hyaluronic acid treatment had no such effect (68.2+/-25.0 pg/microgram vs. 108.0+/-43.4 pg/microgram, p<0.0001 for tear NGF/TP ratio; 2.16+/-1.01 vs. 3.39+/-1.50, p=0.0014 for symptom scale; 1.05+/-0.67 vs. 1.61+/-0.86, p=0.0317 for IC). Measurements taken at both 14 and 28 days indicate that neither prednisolone nor hyaluronic acid treatment affected BUT or Schirmer values.
CONCLUSIONS
KCS patients showed elevated levels of tear NGF, which were decreased by treatment with 0.1% prednisolone. These data suggest that the ocular surface NGF may play an important role in ocular surface inflammation processes associated with dry eyes.
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