Retinal pigment epithelial cells from dystrophic rats form normal tight junctions in vitro

Chih Wei Chang, Dennis M. Defoe, Ruth B Caldwell

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Purpose. In the genetically defective Royal College of Surgeons (RCS) rat model for retinal degeneration, a breakdown occurs in the retinal pigment epithelial (RPE) cell tight junctions just as the photoreceptors begin to degenerate. These experiments sought to determine the impact of the RPE genetic defect on this alteration in the RPE cell tight junctions. Methods. Retinal pigment epithelial cell cultures prepared from RCS and control rats were treated with hormonally defined medium (HDM), base medium conditioned by RCS or control retinas, or unconditioned base medium. The tight junctions formed by these cultures were assayed functionally by measuring transepithelial electrical resistance and permeability. Junction structure was evaluated by immunolocalization of the tight junction protein zonula occludens I and of the junction-associated actin microfilaments. Results. Retinal pigment epithelial cultures from dystrophic rats formed structurally and functionally normal tight junctions when maintained in hormonally defined medium. The junctions remained stable when the medium bathing the apical surface was switched to base medium preconditioned by normal retinas. In contrast, cultures treated with medium preconditioned by degenerating dystrophic retinas or with unconditioned medium exhibited a breakdown in their tight junctions. Conclusions. Retinal pigment epithelial cells isolated from dystrophic RCS rats can form tight junctions normally in vitro. Normal, but not dystrophic, retinas release factors that support RPE tight junctions. Therefore, the junctional abnormality seen in dystrophic rat RPE cells in vivo is probably caused by the loss of trophic factors normally provided by the healthy neural retina rather than by a direct effect of the genetic defect on the tight junctions.

Original languageEnglish (US)
Pages (from-to)188-195
Number of pages8
JournalInvestigative Ophthalmology and Visual Science
Volume38
Issue number1
StatePublished - Feb 6 1997

Fingerprint

Retinal Pigments
Tight Junctions
Epithelial Cells
Retina
Intercellular Junctions
Tight Junction Proteins
In Vitro Techniques
Retinal Degeneration
Conditioned Culture Medium
Electric Impedance
Actin Cytoskeleton
Permeability
Cell Culture Techniques
Surgeons

Keywords

  • blood-retinal barrier
  • cell adhesion
  • retinal cell culture
  • retinal degeneration
  • retinal pigment epithelium
  • tight junction

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

Cite this

Retinal pigment epithelial cells from dystrophic rats form normal tight junctions in vitro. / Chang, Chih Wei; Defoe, Dennis M.; Caldwell, Ruth B.

In: Investigative Ophthalmology and Visual Science, Vol. 38, No. 1, 06.02.1997, p. 188-195.

Research output: Contribution to journalArticle

@article{a7cc8c884f5f43a4a5c16961740fd487,
title = "Retinal pigment epithelial cells from dystrophic rats form normal tight junctions in vitro",
abstract = "Purpose. In the genetically defective Royal College of Surgeons (RCS) rat model for retinal degeneration, a breakdown occurs in the retinal pigment epithelial (RPE) cell tight junctions just as the photoreceptors begin to degenerate. These experiments sought to determine the impact of the RPE genetic defect on this alteration in the RPE cell tight junctions. Methods. Retinal pigment epithelial cell cultures prepared from RCS and control rats were treated with hormonally defined medium (HDM), base medium conditioned by RCS or control retinas, or unconditioned base medium. The tight junctions formed by these cultures were assayed functionally by measuring transepithelial electrical resistance and permeability. Junction structure was evaluated by immunolocalization of the tight junction protein zonula occludens I and of the junction-associated actin microfilaments. Results. Retinal pigment epithelial cultures from dystrophic rats formed structurally and functionally normal tight junctions when maintained in hormonally defined medium. The junctions remained stable when the medium bathing the apical surface was switched to base medium preconditioned by normal retinas. In contrast, cultures treated with medium preconditioned by degenerating dystrophic retinas or with unconditioned medium exhibited a breakdown in their tight junctions. Conclusions. Retinal pigment epithelial cells isolated from dystrophic RCS rats can form tight junctions normally in vitro. Normal, but not dystrophic, retinas release factors that support RPE tight junctions. Therefore, the junctional abnormality seen in dystrophic rat RPE cells in vivo is probably caused by the loss of trophic factors normally provided by the healthy neural retina rather than by a direct effect of the genetic defect on the tight junctions.",
keywords = "blood-retinal barrier, cell adhesion, retinal cell culture, retinal degeneration, retinal pigment epithelium, tight junction",
author = "Chang, {Chih Wei} and Defoe, {Dennis M.} and Caldwell, {Ruth B}",
year = "1997",
month = "2",
day = "6",
language = "English (US)",
volume = "38",
pages = "188--195",
journal = "Investigative Ophthalmology and Visual Science",
issn = "0146-0404",
publisher = "Association for Research in Vision and Ophthalmology Inc.",
number = "1",

}

TY - JOUR

T1 - Retinal pigment epithelial cells from dystrophic rats form normal tight junctions in vitro

AU - Chang, Chih Wei

AU - Defoe, Dennis M.

AU - Caldwell, Ruth B

PY - 1997/2/6

Y1 - 1997/2/6

N2 - Purpose. In the genetically defective Royal College of Surgeons (RCS) rat model for retinal degeneration, a breakdown occurs in the retinal pigment epithelial (RPE) cell tight junctions just as the photoreceptors begin to degenerate. These experiments sought to determine the impact of the RPE genetic defect on this alteration in the RPE cell tight junctions. Methods. Retinal pigment epithelial cell cultures prepared from RCS and control rats were treated with hormonally defined medium (HDM), base medium conditioned by RCS or control retinas, or unconditioned base medium. The tight junctions formed by these cultures were assayed functionally by measuring transepithelial electrical resistance and permeability. Junction structure was evaluated by immunolocalization of the tight junction protein zonula occludens I and of the junction-associated actin microfilaments. Results. Retinal pigment epithelial cultures from dystrophic rats formed structurally and functionally normal tight junctions when maintained in hormonally defined medium. The junctions remained stable when the medium bathing the apical surface was switched to base medium preconditioned by normal retinas. In contrast, cultures treated with medium preconditioned by degenerating dystrophic retinas or with unconditioned medium exhibited a breakdown in their tight junctions. Conclusions. Retinal pigment epithelial cells isolated from dystrophic RCS rats can form tight junctions normally in vitro. Normal, but not dystrophic, retinas release factors that support RPE tight junctions. Therefore, the junctional abnormality seen in dystrophic rat RPE cells in vivo is probably caused by the loss of trophic factors normally provided by the healthy neural retina rather than by a direct effect of the genetic defect on the tight junctions.

AB - Purpose. In the genetically defective Royal College of Surgeons (RCS) rat model for retinal degeneration, a breakdown occurs in the retinal pigment epithelial (RPE) cell tight junctions just as the photoreceptors begin to degenerate. These experiments sought to determine the impact of the RPE genetic defect on this alteration in the RPE cell tight junctions. Methods. Retinal pigment epithelial cell cultures prepared from RCS and control rats were treated with hormonally defined medium (HDM), base medium conditioned by RCS or control retinas, or unconditioned base medium. The tight junctions formed by these cultures were assayed functionally by measuring transepithelial electrical resistance and permeability. Junction structure was evaluated by immunolocalization of the tight junction protein zonula occludens I and of the junction-associated actin microfilaments. Results. Retinal pigment epithelial cultures from dystrophic rats formed structurally and functionally normal tight junctions when maintained in hormonally defined medium. The junctions remained stable when the medium bathing the apical surface was switched to base medium preconditioned by normal retinas. In contrast, cultures treated with medium preconditioned by degenerating dystrophic retinas or with unconditioned medium exhibited a breakdown in their tight junctions. Conclusions. Retinal pigment epithelial cells isolated from dystrophic RCS rats can form tight junctions normally in vitro. Normal, but not dystrophic, retinas release factors that support RPE tight junctions. Therefore, the junctional abnormality seen in dystrophic rat RPE cells in vivo is probably caused by the loss of trophic factors normally provided by the healthy neural retina rather than by a direct effect of the genetic defect on the tight junctions.

KW - blood-retinal barrier

KW - cell adhesion

KW - retinal cell culture

KW - retinal degeneration

KW - retinal pigment epithelium

KW - tight junction

UR - http://www.scopus.com/inward/record.url?scp=0031018869&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031018869&partnerID=8YFLogxK

M3 - Article

VL - 38

SP - 188

EP - 195

JO - Investigative Ophthalmology and Visual Science

JF - Investigative Ophthalmology and Visual Science

SN - 0146-0404

IS - 1

ER -