Abstract

The intraocular kinetics of a variety of fluorophores after topical application to the rabbit eye will be investigated by measuring the changes with time in concentration in the cornea and aqueous with a slit-lamp fluorometer. Diffusion and ism of transport across the cornea will be further investigated by in vitro studies where 1) dynamic measurements of the fluorophore concentration profile in the cornea will be made with a modified specular microscope, and 2) the rate of transfer across the tissue will be made in a chamber designed to avoid edge effects. The following biological parameters for the dyes will be determined: Epithelial permeability, endothelial permeability, diffusion rate in stroma, transit times across the various layers, and equilibrium distribution between aqueous and various layers. The lipophilicity, degree of ionization, and molecular weights of the dyes will be correlated with the above biological properties in an attempt to establish relationships that will assist in the development of therapeutic drugs with improved pharmacokinetic properties. The fluorophores obtained fran commercial sources will be purified. Measurements of the kinetics of the fluorophores in the crystalline lens will be included in the measurements on the intact rabbit in order to determine to what extent it can serve as a reservoir for drugs which will even out the troughs in concentration in the anterior chamber that occur in between topical applications.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Research Project (R01)
Project #
5R01EY004863-08
Application #
3259423
Study Section
Visual Sciences A Study Section (VISA)
Project Start
1983-07-01
Project End
1992-06-30
Budget Start
1990-07-01
Budget End
1991-06-30
Support Year
8
Fiscal Year
1990
Total Cost
Indirect Cost

  Institution

Name
Stanford University
Department
Type
Schools of Medicine
DUNS #
800771545
City
Stanford
State
CA
Country
United States
Zip Code
94305

  Publications

Kumar, J P (2009) The sine oculis homeobox (SIX) family of transcription factors as regulators of development and disease. Cell Mol Life Sci 66:565-83
Srinivas, S P (1994) In situ measurement of fluorescein release by collagen shields in human eyes. Curr Eye Res 13:281-8
Maurice, D M; Srinivas, S P (1992) Use of fluorometry in assessing the efficacy of a cation-sensitive gel as an ophthalmic vehicle: comparison with scintigraphy. J Pharm Sci 81:615-9
Macdonald, E A; Maurice, D M (1991) The kinetics of tear fluid under the lower lid. Exp Eye Res 53:421-5
Araie, M; Maurice, D M (1991) The loss of fluorescein, fluorescein glucuronide and fluorescein isothiocyanate dextran from the vitreous by the anterior and retinal pathways. Exp Eye Res 52:27-39
Macdonald, E A; Maurice, D M (1991) Loss of fluorescein across the conjunctiva. Exp Eye Res 53:427-30
Eliason, J A; Maurice, D M (1990) Staining of the conjunctiva and conjunctival tear film. Br J Ophthalmol 74:519-22
Chen, F S; Maurice, D M (1990) The pH in the precorneal tear film and under a contact lens measured with a fluorescent probe. Exp Eye Res 50:251-9
Araie, M; Maurice, D (1987) The rate of diffusion of fluorophores through the corneal epithelium and stroma. Exp Eye Res 44:73-87
Maurice, D M (1987) Flow of water between aqueous and vitreous compartments in the rabbit eye. Am J Physiol 252:F104-8

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