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By 2 weeks after ADX in mature rats, cortical COX-2 immunoreactivity increased 10-fold in the cortical thick ascending limb and macula densa. The constitutive isoform, COX-1, was unchanged. The magnitude of the changes and specificity of COX-2 immunoreactivity were validated by\n                    <jats:italic>in situ<\/jats:italic>\n                    hybridization histochemistry of COX-2 mRNA and Western blot analysis. Increased COX-2 activity (&gt;5-fold) was documented by using a specific COX-2 inhibitor. The COX-2 up-regulation in ADX rats was reversed by replacement therapy with either corticosterone or deoxycorticosterone acetate. In normal rats, inhibition of glucocorticoid receptors with RU486 or mineralocorticoid receptors with spironolactone caused up-regulation of renal cortical COX-2. These results indicate that COX-2 expression\n                    <jats:italic>in situ<\/jats:italic>\n                    is tonically inhibited by adrenal steroids, and COX-2 is regulated by mineralocorticoids as well as glucocorticoids.\n                  <\/jats:p>","DOI":"10.1073\/pnas.96.26.15280","type":"journal-article","created":{"date-parts":[[2002,7,26]],"date-time":"2002-07-26T10:40:52Z","timestamp":1027680052000},"page":"15280-15285","update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":98,"title":["Regulation of cyclooxygenase-2 (COX-2) in rat renal cortex by adrenal glucocorticoids and mineralocorticoids"],"prefix":"10.1073","volume":"96","author":[{"given":"Ming-Zhi","family":"Zhang","sequence":"first","affiliation":[{"name":"George M. 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