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However, cellular signals underlying the IAS basal tone remain enigmatic. Here we report the origin and molecular mechanisms of calcium signals that control the IAS basal tone, using a combination approach including a novel IAS slice preparation that retains cell arrangement and architecture as in vivo, 2\u2010photon imaging, and cell\u2010specific gene\u2010modified mice. We found that IAS smooth muscle cells generate two forms of contractions (i.e., phasic and sustained contraction) and Ca<jats:sup>2+<\/jats:sup> signals (i.e., synchronized Ca<jats:sup>2+<\/jats:sup> oscillations [SCaOs] and asynchronized Ca<jats:sup>2+<\/jats:sup> oscillations [ACaOs]) that last for hours. RyRs, TMEM16A, <jats:sc>L<\/jats:sc>\u2010type Ca<jats:sup>2+<\/jats:sup> channels, and gap junctions are required for SCaOs, which account for phasic contraction and 75% of sustained contraction. Nevertheless, only RyRs are required for ACaOs, which contribute 25% of sustained contraction. Nitric oxide, the primary neurotransmitter mediating the RAIR, blocks both types of Ca<jats:sup>2+<\/jats:sup> signals, leading to IAS's full relaxation. Our results show that the oscillating nature of Ca<jats:sup>2+<\/jats:sup> signals generates and maintains the basal tone without causing cytotoxicity to IAS. Our study provides insight into fecal continence and normal defecation.<\/jats:p>","DOI":"10.1002\/jcp.30279","type":"journal-article","created":{"date-parts":[[2021,1,16]],"date-time":"2021-01-16T09:57:06Z","timestamp":1610791026000},"page":"5937-5952","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Oscillating calcium signals in smooth muscle cells underlie the persistent basal tone of internal anal sphincter"],"prefix":"10.1002","volume":"236","author":[{"given":"Ping","family":"Lu","sequence":"first","affiliation":[{"name":"Department of Microbiology and Physiological Systems University of Massachusetts Medical School  Worcester Massachusetts USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jun","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Microbiology and Physiological Systems University of Massachusetts Medical School  Worcester Massachusetts USA"},{"name":"Division of Pulmonary Diseases, State Key Laboratory of Biotherapy, and Department of Respiratory and Critical Care Medicine West China Hospital of Sichuan University  Chengdu China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chenghai","family":"Zhang","sequence":"additional","affiliation":[{"name":"Department of Biological Chemistry and Molecular Pharmacology Blavatnik Institute at Harvard Medical School  Boston Massachusetts USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dieter","family":"Saur","sequence":"additional","affiliation":[{"name":"Department of Internal Medicine II, Klinikum rechts der Isar Technische Universit\u00e4t M\u00fcnchen  M\u00fcnchen Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christina E.","family":"Baer","sequence":"additional","affiliation":[{"name":"Department of Microbiology and Physiological Systems University of Massachusetts Medical School  Worcester Massachusetts USA"},{"name":"Sanderson Center for Optical Experimentation University of Massachusetts Medical School  Worcester Massachusetts USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lawrence M.","family":"Lifshitz","sequence":"additional","affiliation":[{"name":"Program in Molecular Medicine University of Massachusetts Medical School  Worcester Massachusetts USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kevin E.","family":"Fogarty","sequence":"additional","affiliation":[{"name":"Program in Molecular Medicine University of Massachusetts Medical School  Worcester Massachusetts USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8953-1494","authenticated-orcid":false,"given":"Ronghua","family":"ZhuGe","sequence":"additional","affiliation":[{"name":"Department of Microbiology and Physiological Systems University of Massachusetts Medical School  Worcester Massachusetts USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2021,1,16]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.3390\/biom10030412"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1152\/ajplung.00494.2005"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1085\/jgp.200709933"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/0471143030.cb0411s59"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1096\/fasebj.2.15.2847949"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1053\/j.gastro.2003.10.014"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1038\/35038011"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1155\/2010\/546163"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1111\/nmo.13746"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1113\/jp273618"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1152\/ajpgi.00331.2014"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.2003.058628"},{"key":"e_1_2_9_14_1","first-page":"1872","article-title":"Glycyrretinic acid blocks cardiac sodium channels expressed in Xenopus oocytes","author":"Du Y.","year":"2009","journal-title":"Journal of Ethnopharmacology"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2982.2011.01806.x"},{"key":"e_1_2_9_16_1","first-page":"294","article-title":"Common anorectal disorders","author":"Foxx\u2010Orenstein A. 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