The work is designed to test the hypothesis that the shape and accommodative power of the lens is determined by the types, quantities and distribution of cytoplasmic filaments, namely the 5.0-8.0 nm actin and 9-12 nm intermediate filaments. As a corollary, disruption, or rearrangement of the normal pattern or change in density of filaments may result in loss of accommodation and/or development of cataract. Indeed, previous studies have shown a qualitative difference in the pattern of filaments in the cells of lenses with little or no accommodative capacity vs. those of lenses with some accommodative capacity. Furthermore, the lens cells of older members of a species generally appear to contain more cytoplasmic filaments than those of younger members. The new studies will be directed towards quantitation of the two types of filaments in young and old members of a species, and in members of several species representing the gamut of accommodative capacity. The main thrust of quantitation will be with electron microscopy techniques designed to differentiate between the two types of filaments, using two published methods, to enhance visualization of the polarity of actin filaments, and to identify actin filaments by an innovative method. Quantitation of actin in lenses of different species and ages by biochemical means will be attempted by DNAase I binding to actin on affinity chromatography columns.

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Research Project (R01)
Project #
5R01EY000698-15
Application #
3255509
Study Section
(SSS)
Project Start
1981-04-01
Project End
1986-03-31
Budget Start
1985-04-01
Budget End
1986-03-31
Support Year
15
Fiscal Year
1985
Total Cost
Indirect Cost
Name
Northwestern University at Chicago
Department
Type
School of Medicine & Dentistry
DUNS #
005436803
City
Chicago
State
IL
Country
United States
Zip Code
60611
Rafferty, N S; Rafferty, K A; Zigman, S (1997) Comparative response to UV irradiation of cytoskeletal elements in rabbit and skate lens epithelial cells. Curr Eye Res 16:310-9
Zigman, S; Rafferty, N S (1994) Catalase activity in dogfish (Mustelus canis) ocular tissues. Biol Bull 187:247-8
Zigman, S; Rafferty, N S (1994) Effects of near UV radiation and antioxidants on the response of dogfish (Mustelus canis) lens to elevated H2O2. Comp Biochem Physiol Physiol 109:463-7
Rafferty, N S; Rafferty, K A; Ito, E (1994) Agonist-induced rise in intracellular calcium of lens epithelial cells: effects on the actin cytoskeleton. Exp Eye Res 59:191-201
Rafferty, N S; Zigman, S; McDaniel, T et al. (1993) Near-UV radiation disrupts filamentous actin in lens epithelial cells. Cell Motil Cytoskeleton 26:40-8
Zigman, S; Rafferty, N S; Scholz, D L et al. (1992) The effects of near-UV radiation on elasmobranch lens cytoskeletal actin. Exp Eye Res 55:193-201
Rafferty, N S; Rafferty, K A (1992) Lens cytoskeleton and after-cataract. Acta Ophthalmol Suppl :34-45
Rafferty, N S; Scholz, D L (1991) Development of actin polygonal arrays in rabbit lens epithelial cells. Curr Eye Res 10:637-43
Rafferty, N S; Scholz, D L; Goldberg, M et al. (1990) Immunocytochemical evidence for an actin-myosin system in lens epithelial cells. Exp Eye Res 51:591-600
Liou, W (1990) Whole-mount preparations of mouse lens epithelium for the fluorescent cytological study of actin. J Microsc 157:239-45

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