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These steps are typically treated as independent design problems and optimized separately.<\/jats:p>\n <\/jats:sec>\n \n Objective<\/jats:title>\n This review argues that escape and release are coupled through the same electrostatic and pH-dependent interactions, creating a fundamental tradeoff . The cationic charge that enables a polymer to destabilize endosomal membranes also tightens its grip on the nucleic acid payload, so conditions favoring escape simultaneously inhibit release.<\/jats:p>\n <\/jats:sec>\n \n Methods<\/jats:title>\n \n We trace this tradeoff across the major strategy classes in the polymeric delivery literature, evaluating each by where and when its trigger acts relative to the escape event. We further assess the assay toolkit for measuring escape and release, and the translational variables that shift the balance\n in vivo<\/jats:italic>\n .\n <\/jats:p>\n <\/jats:sec>\n \n Results<\/jats:title>\n \n pH-responsive polymers tune the activation zone for membrane destabilization but cannot decouple escape from binding, since both depend on the same protonation events. Charge-shifting polymers address release more directly by programming a loss of cationic character after endosomal entry. Non-pH triggers, including disulfide, thioketal, diselenide, and esterase-responsive chemistries, off er orthogonal release mechanisms but face spatial and temporal alignment constraints. Characteristic failure modes recur: premature release, redundant triggering, and kinetic misalignment. No existing assay measures endosomal disruption and cargo release state simultaneously, and translational variables including protein corona formation, cell-type-dependent endosomal acidifi cation, and PEG shielding shift the balance in ways\n in vitro<\/jats:italic>\n screening does not capture.\n <\/jats:p>\n <\/jats:sec>\n \n Conclusion<\/jats:title>\n The tradeoff cannot be resolved by chemistry alone, meaning the responsive trigger considered in isolation. Its resolution requires coordination across spatial (architectural domain segregation), temporal (kinetic alignment of escape and release), and formulation-level (N\/P ratio, PEG density, formation pH) design axes.<\/jats:p>\n <\/jats:sec>","DOI":"10.1007\/s11095-026-04173-6","type":"journal-article","created":{"date-parts":[[2026,8,7]],"date-time":"2026-08-07T16:34:15Z","timestamp":1786120455000},"page":"2553-2588","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Stimulus-Responsive Polymeric Carriers for Gene Delivery: Balancing Endosomal Escape with Nucleic Acid Release"],"prefix":"10.1007","volume":"43","author":[{"given":"Kenneth","family":"Hulugalla","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexander W.","family":"Fortenberry","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dilusha J.","family":"de Silva","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas","family":"Werfel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,8,7]]},"reference":[{"issue":"28","key":"4173_CR1","doi-asserted-by":"publisher","first-page":"2800","DOI":"10.1039\/D4PY00234B","volume":"15","author":"I Porello","year":"2024","unstructured":"Porello I, Bono N, Candiani G, Cellesi F. 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