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At protein level, \u03b21i protein expression was analyzed by immunoblotting. Functional effects of proteasome inhibition on proteolytic activity and induction of apoptosis were also evaluated in cellular subsets.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results.<\/jats:title><jats:p>The proteasome was found to be activated in pSS, with upregulation of gene expression of catalytic proteasome subunits. Western blot analysis revealed decreased \u03b21i protein expression in pSS B lymphocytes, with decreased protein despite increased messenger RNA (mRNA) levels. After proteasome inhibition<jats:italic>in vitro<\/jats:italic>, proteolytic activity was less reduced and resistance to apoptosis was increased in B lymphocytes compared to other cells.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion.<\/jats:title><jats:p>In pSS, catalytic subunits of the proteasome are upregulated at the mRNA level, while dysregulation of subunit \u03b21i is attributed to B lymphocytes. B cell resistance after proteasome inhibition differs from the classical concept of increased susceptibility toward inhibition in activated cells, supporting the novel notion that susceptibility depends on cellular intrinsic factors and on proteasome activation.<\/jats:p><\/jats:sec>","DOI":"10.3899\/jrheum.120680","type":"journal-article","created":{"date-parts":[[2013,3,16]],"date-time":"2013-03-16T07:42:35Z","timestamp":1363419755000},"page":"663-673","source":"Crossref","is-referenced-by-count":10,"title":["Gene Expression of Catalytic Proteasome Subunits and Resistance Toward Proteasome Inhibition of B Lymphocytes from Patients with Primary Sj\u00f6gren 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