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We challenge this paradigm by introducing intracellular mechanosensation in intestinal smooth muscle. We hypothesized that a distinct, organelle\u2010based signalling axis exists to amplify mechanotransduction from the inside out. To test this we investigated whether Piezo1, a canonical plasma membrane (PM) mechanosensor, also operates within the cell. Using tissue\u2010level wire myography, high\u2010resolution confocal microscopy, proximity ligation assays and patch\u2010clamp electrophysiology on freshly dissociated cells, we identified a previously uncharacterized Piezo1\u2010RyR\u2010BK\n Ca<\/jats:sub>\n signalling axis in small intestinal smooth muscle cells (SMC). This intracellular mechanism relies on a nanoscale signalling complex (<40 nm) comprising an intracellular sensor (intra\u2010Piezo1) and an amplifier (ryanodine receptor, RyR), coupled with a PM effector (large\u2010conductance, Ca\n 2+<\/jats:sup>\n \u2010activated K\n +<\/jats:sup>\n channels, i.e., BK\n Ca<\/jats:sub>\n channels). Activating this intracellular complex generated paxilline\u2010sensitive outward currents independent of extracellular Ca\n 2+<\/jats:sup>\n and dependent on internal SR Ca\n 2+<\/jats:sup>\n stores, consistent with intrinsic organellar mechanotransduction. Within this complex intra\u2010Piezo1 and RyR are positioned to operate as a coupled SR Ca\n 2+<\/jats:sup>\n release unit that activates BK channels at SR\u2013PM junctions, driving potent membrane hyperpolarization that reduces smooth muscle contractility, revealing the intra\u2010Piezo1 complex as a molecular brake on excitation. These findings support a model in which mechanotransduction is not confined to the cell surface. Instead a specialized sensor\u2013amplifier\u2013effector complex originating at intracellular organelles amplifies cellular sensitivity to physical force, providing a critical gain\u2010control system that restrains smooth muscle excitability and regulates gastrointestinal (GI) motility.\n \n \n image<\/jats:alt-text>\n <\/jats:graphic>\n <\/jats:boxed-text>\n <\/jats:p>\n <\/jats:sec>\n \n Key points<\/jats:title>\n \n \n \n This study advances a framework in which intracellular organelles contribute to mechanosensory signalling in gastrointestinal (GI) smooth muscle cells, complementing plasma membrane mechanisms.<\/jats:p>\n <\/jats:list-item>\n \n \n Piezo1 is predominantly intracellular in intestinal smooth muscle, where this pool, intra\u2010Piezo1, forms a nanoscale signalling complex on the sarcoplasmic reticulum (SR) that positions it within <40 nm of RyR and of sarcolemmal large\u2010conductance, Ca\n 2+<\/jats:sup>\n \u2010activated K\n +<\/jats:sup>\n (BK\n Ca<\/jats:sub>\n ) channels.\n <\/jats:p>\n <\/jats:list-item>\n \n \n Electrophysiological recordings\u00a0show that this \u2018sensor\u2013amplifier\u2013effector\u2019 mechanism generates potent paxilline\u2010sensitive hyperpolarizing currents that depend on SR Ca\n 2+<\/jats:sup>\n release and persist without extracellular Ca\n 2+<\/jats:sup>\n , amplifying the cell's response to mechanical stress when intra\u2010Piezo1 is activated from the inside out.\n <\/jats:p>\n <\/jats:list-item>\n \n Activation of this intra\u2010Piezo1\u2010mediated axis significantly dampens smooth muscle contractility, acting as a molecular \u2018brake\u2019 that supports the stretch\u2010induced\u2010relaxation feedback mechanism essential for intestinal function.<\/jats:p>\n <\/jats:list-item>\n <\/jats:list>\n <\/jats:p>\n <\/jats:sec>","DOI":"10.1113\/jp291215","type":"journal-article","created":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T07:46:56Z","timestamp":1789026416000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Intracellular mechanosensation in intestinal smooth muscle: Piezo1 complexes amplify signalling beyond the surface"],"prefix":"10.1113","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0245-9272","authenticated-orcid":false,"given":"Geoanna M.","family":"Bautista","sequence":"first","affiliation":[{"name":"Department of Pediatrics University of California Davis Sacramento California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-4107-4829","authenticated-orcid":false,"given":"Declan","family":"Manning","sequence":"additional","affiliation":[{"name":"Department of Physiology and Membrane Biology University of California Davis Davis California 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