{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T11:28:42Z","timestamp":1791113322198,"version":"4.1.0"},"reference-count":42,"publisher":"American Physiological Society","issue":"6","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["American Journal of Physiology-Renal Physiology"],"published-print":{"date-parts":[[2004,12]]},"abstract":"<jats:p>Pendrin (Pds; Slc26A4) is a new anion exchanger that is believed to mediate apical Cl<jats:sup>\u2212<\/jats:sup>\/HCO<jats:sub>3<\/jats:sub><jats:sup>\u2212<\/jats:sup>exchange in type B and non-A-non-B intercalated cells of the connecting tubule and cortical collecting duct. Recently, it has been proposed that this transporter may be involved in NaCl balance and blood pressure regulation in addition to its participation in the regulation of acid-base status. The purpose of our study was to determine the regulation of Pds protein abundance during chronic changes in chloride balance. Rats were subjected to either NaCl, NH<jats:sub>4<\/jats:sub>Cl, NaHCO<jats:sub>3<\/jats:sub>, KCl, or KHCO<jats:sub>3<\/jats:sub>loading for 6 days or to a low-NaCl diet or chronic furosemide administration. Pds protein abundance was estimated by semiquantitative immunoblotting in renal membrane fractions isolated from the cortex of treated and control rats. We observed a consistent inverse relationship between Pds expression and diet-induced changes in chloride excretion independent of the administered cation. Conversely, NaCl depletion induced by furosemide was associated with increased Pds expression. 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