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To study the involvement of the proteasome in ocular lens cell proliferation and differentiation, a partial cDNA encoding rat S7, a subunit of the ATPase complex that regulates the 20S proteasome (multicatalytic proteinase complex), and RC3, a subunit of the 20S proteasome moiety, were cloned and used to compare relative levels of S7 and RC3 mRNAs. mRNA was measured, using a competitive RT-PCR assay,...
We previously showed that lens epithelial cells have a fully functional ubiquitin-proteasome pathway (UPP) and that ubiquitin-conjugating activity is up-regulated in response to oxidative stress. In this study we assessed the protein levels and activities of different components of the UPP in lens fibers. Calf lenses were dissected into four different regions: epithelial layer, outer cortex, inner...
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