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Here we investigated whether the Na\n                    <jats:sup>+<\/jats:sup>\n                    \/H\n                    <jats:sup>+<\/jats:sup>\n                    exchanger (NHE) may regulate extracellular pH (pHe), intracellular pH (pHi) and [Ca\n                    <jats:sup>2+<\/jats:sup>\n                    ]\n                    <jats:sub>i<\/jats:sub>\n                    in the SCN. In hypothalamic slices bathed in HEPES-buffered solution a standing acidification of ~0.3\u2009pH units was recorded with pH-sensitive microelectrodes in the SCN but not extra-SCN areas. The NHE blocker amiloride alkalinised the pHe. RT-PCR revealed mRNA for plasmalemmal-type NHE1, NHE4, and NHE5 isoforms, whereas the NHE1-specific antagonist cariporide alkalinised the pHe. Real-time PCR and western blotting failed to detect day-night variation in NHE1 mRNA and protein levels. Cariporide induced intracellular acidosis, increased basal [Ca\n                    <jats:sup>2+<\/jats:sup>\n                    ]\n                    <jats:sub>i<\/jats:sub>\n                    , and decreased depolarisation-induced Ca\n                    <jats:sup>2+<\/jats:sup>\n                    rise, with the latter two effects being abolished with nimodipine blocking the L-type Ca\n                    <jats:sup>2+<\/jats:sup>\n                    channels. Immunofluorescent staining revealed high levels of punctate colocalisation of NHE1 with serotonin transporter (SERT) or CaV1.2, as well as triple staining of NHE1, CaV1.2, and SERT or the presynaptic marker Bassoon. Our results indicate that NHE1 actively extrudes H\n                    <jats:sup>+<\/jats:sup>\n                    to regulate pHi and nimodipine-sensitive [Ca\n                    <jats:sup>2+<\/jats:sup>\n                    ]\n                    <jats:sub>i<\/jats:sub>\n                    in the soma, and along with CaV1.2 may also regulate presynaptic Ca\n                    <jats:sup>2+<\/jats:sup>\n                    levels and, perhaps at least serotonergic, neurotransmission in the SCN.\n                  <\/jats:p>","DOI":"10.1038\/s41598-019-42872-w","type":"journal-article","created":{"date-parts":[[2019,4,23]],"date-time":"2019-04-23T06:03:39Z","timestamp":1555999419000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["The Na+\/H+-Exchanger NHE1 Regulates Extra- and Intracellular pH and Nimodipine-sensitive [Ca2+]i in the Suprachiasmatic Nucleus"],"prefix":"10.1038","volume":"9","author":[{"given":"Pi-Cheng","family":"Cheng","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hsin-Yi","family":"Lin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ya-Shuan","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ruo-Ciao","family":"Cheng","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hung-Che","family":"Su","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rong-Chi","family":"Huang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2019,4,23]]},"reference":[{"key":"42872_CR1","doi-asserted-by":"publisher","first-page":"549","DOI":"10.1007\/s00424-003-1110-3","volume":"447","author":"J Orlowski","year":"2004","unstructured":"Orlowski, J. & Grinstein, S. 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