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Here we describe the first Ca<jats:sup>2+<\/jats:sup> channel toxin present in <jats:italic>Tityus serrulatus<\/jats:italic> (<jats:italic>Ts<\/jats:italic>) venom, a cell penetrating peptide (CPP) named CPP-Ts. We show that CPP-Ts increases intracellular Ca<jats:sup>2+<\/jats:sup> release through the activation of nuclear InsP3R of cardiomyocytes, thereby causing an increase in the contraction frequency of these cells. Besides proposing a novel subfamily of Ca<jats:sup>2+<\/jats:sup> active toxins, we investigated its potential use as a drug delivery system targeting cancer cell nucleus using CPP-Ts\u2019s nuclear-targeting property. To this end, we prepared a synthetic CPP-Ts sub peptide<jats:sup>14\u201339<\/jats:sup> lacking pharmacological activity which was directed to the nucleus of specific cancer cell lines. This research identifies a novel subfamily of Ca<jats:sup>2+<\/jats:sup> active toxins and provides new insights into biotechnological applications of animal venoms.<\/jats:p>","DOI":"10.1038\/s41598-018-33133-3","type":"journal-article","created":{"date-parts":[[2018,9,27]],"date-time":"2018-09-27T10:18:46Z","timestamp":1538043526000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["CPP-Ts: a new intracellular calcium channel modulator and a promising tool for drug delivery in cancer cells"],"prefix":"10.1038","volume":"8","author":[{"given":"B\u00e1rbara Bruna Ribeiro de","family":"Oliveira-Mendes","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carolina Campolina Rebello","family":"Horta","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4646-513X","authenticated-orcid":false,"given":"Anderson Oliveira","family":"do Carmo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabriela Lago","family":"Biscoto","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Douglas Ferreira","family":"Sales-Medina","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hort\u00eansia Gomes","family":"Leal","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pedro Ferreira Pinto","family":"Brand\u00e3o-Dias","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sued Eust\u00e1quio Mendes","family":"Miranda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carla Jeane","family":"Aguiar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valbert Nascimento","family":"Cardoso","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7641-6585","authenticated-orcid":false,"given":"Andr\u00e9 Luis Branco","family":"de Barros","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carlos","family":"Ch\u00e1vez-Olort\u00e9gui","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M. 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