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While the mitogen-activated protein kinase kinase (MEK) inhibitors, selumetinib and mirdametinib, can reduce tumor volume, surgical resection remains the primary treatment for immediate debulking and symptom relief. Complete removal is often limited by tumor infiltration along nerve plexuses, and residual tumors may undergo postsurgical tissue remodeling, producing localized regions of stiffened extracellular matrix (ECM). The impact of ECM stiffness on pNF1 growth and drug responses remains unclear. Using immortalized patient-derived pNF1 tumor cell lines cultured in 3D hydrogels with defined stiffness (1.5 kPa, soft; 7 kPa, stiff), we found that stiff ECM promoted spread morphology, increased growth, and progressive intracellular softening. Stiff ECM also reduced lysyl oxidase (LOX) expression, suggesting mechanoadaptive ECM remodeling, and increased P-glycoprotein expression. Under the same conditions, stiff ECM was associated with reduced sensitivity to selumetinib. These results provide the first evidence that ECM stiffening, including that plausibly associated with postsurgical remodeling, may contribute to pNF1 growth and reduced sensitivity to selumetinib in this 3D pNF1 culture model. Our findings highlight mechanobiology as a key regulator of tumor behavior and support further investigation of ECM-targeted strategies to improve outcomes in neurofibromatosis type 1 (NF1).<\/jats:p>","DOI":"10.3390\/cells15100877","type":"journal-article","created":{"date-parts":[[2026,5,25]],"date-time":"2026-05-25T06:42:18Z","timestamp":1779691338000},"page":"877","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Mechanical Stiffening Promotes Growth, Invasion-Associated Phenotypes, and Reduced Selumetinib Sensitivity in 3D Plexiform Neurofibroma Cultures"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7336-265X","authenticated-orcid":false,"given":"Kyungmin","family":"Ji","sequence":"first","affiliation":[{"name":"Department of Neurology, Henry Ford Health System, Detroit, MI 48202, USA"},{"name":"Department of Pharmacology, Wayne State University, Detroit, MI 48201, USA"},{"name":"Department of Physiology, Michigan State University, East Lansing, MI 48824, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chenjun","family":"Shi","sequence":"additional","affiliation":[{"name":"Department of Biomedical Engineering, Michigan State University, East Lansing, MI 48823, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6240-0371","authenticated-orcid":false,"given":"Jitao","family":"Zhang","sequence":"additional","affiliation":[{"name":"Department of Biomedical Engineering, Michigan State University, East Lansing, MI 48823, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3177-3861","authenticated-orcid":false,"given":"Raymond R.","family":"Mattingly","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, Wayne State University, Detroit, MI 48201, USA"},{"name":"Department of Pharmacology and Toxicology, East Carolina University Brody Medical School, Greenville, NC 27834, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,5,12]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"31","DOI":"10.1002\/(SICI)1096-8628(19990326)89:1<31::AID-AJMG7>3.0.CO;2-W","article-title":"Plexiform neurofibromas","volume":"89","author":"Korf","year":"1999","journal-title":"Am. 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