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Circadian rhythm of intraocular pressure in the rat

 

作者: MooreC. G.,   JohnsonElaine C.,   MorrisonJohn C.,  

 

期刊: Current Eye Research  (Taylor Available online 1996)
卷期: Volume 15, issue 2  

页码: 185-191

 

ISSN:0271-3683

 

年代: 1996

 

DOI:10.3109/02713689608997412

 

出版商: Taylor&Francis

 

关键词: circadian rhythm;glaucoma;intraocular pressure;rat;TonoPen

 

数据来源: Taylor

 

摘要:

To define the characteristics of the diurnal variation of intraocular pressure (IOP) in eyes of awake rats, ten male brown Norway rats were entrained to a 12-hour light: 12-hour dark (12L:12D) lighting schedule and were conditioned to IOP measurement with the TonoPen XL tonometer while awake, using only 0.5% proparacaine HC1 anesthesia. The IOP measurements were performed in 4 experiments:Preliminary-IOP was measured at 6-hour intervals in both eyes of each animal, to determine correlation between right and left eyes;Light:Dark-lightingremained the same as in the preliminary experiment, but the measurement schedule was altered so that measurements were obtained at 4-hour intervals in alternating eyes, over two 24-hour light cycles;Dark:Dark-animalswere placed in constant dark (0L:24D) and, after 72 h, measurements were obtained at 4-hour intervals in alternating eyes. Animals were then re-entrained to the previous 12L:12D schedule for 7 days, after which they were returned to constant dark and the experiment was repeated; andDark:Light-animalswere entrained to a reversed light:dark cycle (12D:12L) for 28 days, after which measurements were obtained in the same fashion as in the Light:Dark experiment. Close agreement was found between right-and left-eye IOPs. Animals on a 12L:12D schedule exhibited lowest IOP while the lights were on (19.3±1.9 mm Hg), and highest (31.3±1.3 mm Hg) while the lights were off. Pressure changes anticipated the change from light to dark and dark to light. This pattern persisted in constant dark, and was reversed when the cycle was changed to 12D:12L. Brown Norway rats possess a regular rhythm of IOP that is entrained by the cycle of light and dark, and persistence of this rhythm in constant dark establishes it as a circadian rhythm. Furthermore, our results indicate that reliable and physiologically meaningful IOP measurements can be obtained in awake rats using the TonoPen XL tonometer.

 

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