{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,13]],"date-time":"2026-07-13T16:34:08Z","timestamp":1783960448177,"version":"3.55.0"},"reference-count":44,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2009,1,29]],"date-time":"2009-01-29T00:00:00Z","timestamp":1233187200000},"content-version":"vor","delay-in-days":1673,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["bpspubs.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["British J Pharmacology"],"published-print":{"date-parts":[[2004,7]]},"abstract":"<jats:p>\n<jats:list list-type=\"explicit-label\">\n<jats:list-item><jats:p>Topiramate (TPM) is an anticonvulsant whose impact on firing activity and intracellular pH (pHi) regulation of CA3 neurons was investigated.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>Using the 4\u2010aminopyridine\u2010treated hippocampal slice model bathed in bicarbonate\u2010buffered solution, TPM (25\u201350 <jats:italic>\u03bc<\/jats:italic><jats:sc>M<\/jats:sc>) reduced the frequency of epileptiform bursts and action potentials without affecting membrane potential or input resistance. Inhibitory effects of TPM were reversed by trimethylamine\u2010induced alkalinization.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>TPM also lowered the steady\u2010state pHi of BCECF\u2010AM\u2010loaded neuronal somata by 0.18\u00b10.07 pH units in CO<jats:sub>2<\/jats:sub>\/HCO<jats:sub>3<\/jats:sub><jats:sup>\u2212<\/jats:sup>\u2010buffered solution. Subsequent to an ammonium prepulse, TPM reduced the acidotic peak but clearly slowed pHi recovery. These complex changes were mimicked by the protein phosphatase inhibitor okadaic acid.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>Alkalosis upon withdrawal of extracellular Cl<jats:sup>\u2212<\/jats:sup> was augmented by TPM. Furthermore, at decreased pHi due to the absence of extracellular Na<jats:sup>+<\/jats:sup>, TPM reversibly increased pHi. These findings demonstrate that TPM modulates Na<jats:sup>+<\/jats:sup>\u2010independent Cl<jats:sup>\u2212<\/jats:sup>\/HCO<jats:sub>3<\/jats:sub><jats:sup>\u2212<\/jats:sup> exchange.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>In the nominal absence of extracellular CO<jats:sub>2<\/jats:sub>\/HCO<jats:sub>3<\/jats:sub><jats:sup>\u2212<\/jats:sup> buffer, both steady\u2010state pHi and firing of epileptiform bursts remained unchanged upon adding TPM. However, pHi recovery subsequent to an ammonium prepulse was slightly increased, as was the case in the presence of the carbonic anhydrase (CA) inhibitor acetazolamide. Thus, a slight reduction of intracellular buffer capacity by TPM may be due to an inhibitory effect on intracellular CA.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>Together, these findings show that TPM lowers neuronal pHi most likely due to a combined effect on Na<jats:sup>+<\/jats:sup>\u2010independent Cl<jats:sup>\u2212<\/jats:sup>\/HCO<jats:sub>3<\/jats:sub><jats:sup>\u2212<\/jats:sup> exchange and CA. The apparent decrease of steady\u2010state pHi may contribute to the anticonvulsive property of TPM.<\/jats:p><\/jats:list-item>\n<\/jats:list>\n<\/jats:p><jats:p><jats:italic>British Journal of Pharmacology<\/jats:italic> (2004) <jats:bold>142<\/jats:bold>, 831\u2013842. doi:<jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"doi\" xlink:href=\"10.1038\/sj.bjp.0705850\">10.1038\/sj.bjp.0705850<\/jats:ext-link><\/jats:p>","DOI":"10.1038\/sj.bjp.0705850","type":"journal-article","created":{"date-parts":[[2004,7,1]],"date-time":"2004-07-01T23:23:46Z","timestamp":1088724226000},"page":"831-842","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":52,"title":["Topiramate modulates pH of hippocampal CA3 neurons by combined effects on carbonic anhydrase and Cl<sup>\u2212<\/sup>\/HCO<sub>3<\/sub><sup>\u2212<\/sup> exchange"],"prefix":"10.1111","volume":"142","author":[{"given":"Tobias","family":"Leniger","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jan","family":"Th\u00f6ne","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin","family":"Wiemann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2009,1,29]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1471-4159.2003.02186.x"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.1996.sp021396"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF00238204"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0006-8993(98)00341-2"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0006-8993(99)01687-X"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0028-3908(00)00033-2"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0006-8993(00)02350-7"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0924-977X(99)00063-2"},{"key":"e_1_2_7_10_1","doi-asserted-by":"crossref","first-page":"1205","DOI":"10.1096\/fasebj.10.10.8751723","article-title":"Superiority of in vitro over in vivo calibrations of BCECF in vascular smooth muscle cells","volume":"10","author":"BOYARSKY G.","year":"1996","journal-title":"FASEB J."},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.2002.027235"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0960-894X(03)00029-5"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.1212\/WNL.47.3.756"},{"key":"e_1_2_7_14_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00210-001-0486-x"},{"key":"e_1_2_7_15_1","doi-asserted-by":"crossref","first-page":"S40","DOI":"10.1111\/j.1528-1157.2000.tb02170.x","article-title":"Effects of topiramate on sustained repetitive firing and spontaneous recurrent seizure discharges in cultured hippocampal neurons","volume":"41","author":"DE LORENZO R.J.","year":"2000","journal-title":"Epilepsia"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1528-1157.2000.tb02169.x"},{"key":"e_1_2_7_17_1","doi-asserted-by":"publisher","DOI":"10.1002\/ana.410350214"},{"key":"e_1_2_7_18_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1528-1157.2000.tb02164.x"},{"key":"e_1_2_7_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0006-8993(98)00116-4"},{"key":"e_1_2_7_20_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0028-3908(01)00171-X"},{"key":"e_1_2_7_21_1","doi-asserted-by":"crossref","first-page":"4516","DOI":"10.1016\/S0021-9258(18)61222-0","article-title":"Na+\u2010independent Cl\u2212\u2013HCO3\n                  \u2212\u2010exchange in Madin\u2010Darby canine kidney cells. 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