{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T01:16:16Z","timestamp":1760058976695,"version":"build-2065373602"},"reference-count":33,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2025,5,18]],"date-time":"2025-05-18T00:00:00Z","timestamp":1747526400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"La Ligue Contre le Cancer","award":["AK\/IP\/BC\/16094\/16792","IP\/BC-17040"],"award-info":[{"award-number":["AK\/IP\/BC\/16094\/16792","IP\/BC-17040"]}]},{"name":"Comit\u00e9 D\u00e9partemental de la Ligue Contre le Cancer, Comit\u00e9 de Loire-Atlantique","award":["AK\/IP\/BC\/16094\/16792","IP\/BC-17040"],"award-info":[{"award-number":["AK\/IP\/BC\/16094\/16792","IP\/BC-17040"]}]},{"name":"Association \u201cVie et Espoir\u201d","award":["AK\/IP\/BC\/16094\/16792","IP\/BC-17040"],"award-info":[{"award-number":["AK\/IP\/BC\/16094\/16792","IP\/BC-17040"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Mechanogated (MG) ion channels play a crucial role in mechano-transduction and immune cell regulation, yet their impact on blood cancers, particularly acute lymphoblastic leukemia (ALL), remains poorly understood. This study investigates the pharmacological effects of GsMTx4, an MG channel inhibitor, in human ALL cells both in vitro and in vivo. Unexpectedly, we found that GsMTx4 remarkably increased basal calcium (Ca2+) levels in ALL cells through constitutive Ca2+ entry and enhanced store-operated Ca2\u207a influx upon thapsigargin stimulation. This increase in basal Ca2+ signaling promoted ALL cell viability and proliferation in vitro. Notably, chelating intracellular Ca2+ with BAPTA-AM reduces GsMTx4-mediated leukemia cell viability and proliferation. However, in vivo, GsMTx4 decreases cytosolic Ca2+ levels in Nalm-6 GFP\u207a cells isolated from mouse blood, effectively countering leukemia progression and significantly extending survival in NSG mice transplanted with leukemia cells (median survival: GsMTx4 vs. control, 37.5 days vs. 29 days, p = 0.0414). Our results highlight the different properties of GsMTx4 activity in in vitro and in vivo models. They also emphasize that Ca2+ signaling is a key vulnerability in leukemia, where its precise modulation dictates disease progression. Thus, targeting Ca2+ channels could offer a novel therapeutic strategy for leukemia by exploiting Ca2+ homeostasis.<\/jats:p>","DOI":"10.3390\/ijms26104822","type":"journal-article","created":{"date-parts":[[2025,5,19]],"date-time":"2025-05-19T07:34:03Z","timestamp":1747640043000},"page":"4822","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Opposing Calcium-Dependent Effects of GsMTx4 in Acute Lymphoblastic Leukemia: In Vitro Proliferation vs. In Vivo Survival Advantage"],"prefix":"10.3390","volume":"26","author":[{"given":"Souleymane","family":"Abdoul-Azize","sequence":"first","affiliation":[{"name":"UMR 1234, Inserm, Univ Rouen Normandie, 22 Boulevard Gambetta, F-76000 Rouen, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rachid","family":"Zoubairi","sequence":"additional","affiliation":[{"name":"UMR 1234, Inserm, Univ Rouen Normandie, 22 Boulevard Gambetta, F-76000 Rouen, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7591-307X","authenticated-orcid":false,"given":"Olivier","family":"Boyer","sequence":"additional","affiliation":[{"name":"UMR 1234, Inserm, Univ Rouen Normandie, 22 Boulevard Gambetta, F-76000 Rouen, France"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,5,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"255","DOI":"10.1038\/leu.2009.250","article-title":"EDUCATIONAL REPORT Long-Term Results of the Italian Association of Pediatric Hematology and Oncology (AIEOP) Studies 82, 87, 88, 91 and 95 for Childhood Acute Lymphoblastic Leukemia","volume":"24","author":"Conter","year":"2010","journal-title":"Leukemia"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"47","DOI":"10.2147\/BLCTT.S170351","article-title":"Recent Advances in the Biology and Treatment of B-Cell Acute Lymphoblastic Leukemia","volume":"8","author":"Hefazi","year":"2018","journal-title":"Blood Lymphat. 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