PKCγ, role in lens differentiation and gap junction coupling.

Abstract:

PURPOSE:To determine the role of PKCγ in the regulation of gap junction coupling in the normal lens, we have compared the properties of coupling in lenses from wild type (WT) and PKC-γ knockout (KO) mice. METHODS:Western blotting, confocal immunofluorescence microscopy, immunoprecipitation, RT-PCR and quantitative real time PCR were used to study gap junction protein and message expression; gap junction coupling conductance and pH gating were measured in intact lenses using impedance studies. RESULTS:There were no gross differences in size, clarity, or expression of full-length Cx46 or Cx50 in lenses from WT and PKCγ KO mice. However, total Cx43 protein expression was ~150% higher in the KO lenses. In WT lenses, Cx43 was found only in epithelial cells whereas in KO lenses, its expression continued into the fiber cells. Gap junction coupling conductance in the differentiating fibers (DF) of PKCγ KO lenses was 34% larger than that of WT. In the mature fiber (MF), the effect was much larger with the KO lenses having an 82% increase in coupling over WT. pH gating of the DF fibers was not altered by the absence of PKCγ. CONCLUSION:PKCγ has a major role in the regulation of gap junction expression and coupling in the normal lens.

journal_name

Curr Eye Res

journal_title

Current eye research

authors

Das S,Wang H,Molina SA,Martinez-Wittinghan FJ,Jena S,Bossmann LK,Miller KA,Mathias RT,Takemoto DJ

doi

10.3109/02713683.2011.573899

subject

Has Abstract

pub_date

2011-07-01 00:00:00

pages

620-31

issue

7

eissn

0271-3683

issn

1460-2202

journal_volume

36

pub_type

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