{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,13]],"date-time":"2026-08-13T05:27:04Z","timestamp":1786598824172,"version":"build-2736575974"},"reference-count":100,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2026,8,11]],"date-time":"2026-08-11T00:00:00Z","timestamp":1786406400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100016047","name":"Science Fund of the Republic of Serbia","doi-asserted-by":"crossref","award":["17811"],"award-info":[{"award-number":["17811"]}],"id":[{"id":"10.13039\/501100016047","id-type":"DOI","asserted-by":"crossref"}]},{"award":["17811"],"award-info":[{"award-number":["17811"]}],"id":[{"id":"https:\/\/ror.org\/02r531a15","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Ministry of Science, Technological Development, and Innovation of the Republic of Serbia","award":["451-03-33\/2026-03\/200161"],"award-info":[{"award-number":["451-03-33\/2026-03\/200161"]}]},{"name":"Ministry of Science, Technological Development, and Innovation of the Republic of Serbia","award":["451-03-34\/2026-03\/200161"],"award-info":[{"award-number":["451-03-34\/2026-03\/200161"]}]},{"award":["451-03-33\/2026-03\/200161"],"award-info":[{"award-number":["451-03-33\/2026-03\/200161"]}],"id":[{"id":"https:\/\/ror.org\/01znas443","id-type":"ROR","asserted-by":"publisher"}]},{"award":["451-03-34\/2026-03\/200161"],"award-info":[{"award-number":["451-03-34\/2026-03\/200161"]}],"id":[{"id":"https:\/\/ror.org\/01znas443","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Pharmaceutics"],"abstract":"<jats:p>Lipid nanoparticles (LNPs) are now the leading delivery platform for nucleic acid therapeutics, but progress in the field is measured almost entirely by physicochemical and computational proxies rather than by functional properties that determine therapeutic outcomes. This review examines six interconnected areas of LNP development: microfluidic manufacturing, lyophilization, transdermal microneedle delivery, machine learning-guided formulation design, endosomal escape biology, and protein corona-mediated organ targeting. Although these areas are often discussed separately, they are linked by a common gap between routinely measured physicochemical or computational endpoints and the biological outcomes that determine therapeutic performance. A recently developed antifouling coating substantially reduced microfluidic channel fouling under the tested conditions, although its scalability remains to be validated. Lyophilization, by contrast, still requires formulation specific re-optimization for each new lipid composition, which remains an important barrier to clinical translation. In microneedle-based delivery, physicochemical integrity after fabrication is routinely treated as a proxy for therapeutic function, although, to our knowledge, no published study has directly compared endosomal escape capacity before and after microneedle fabrication. In machine learning, model accuracy is limited primarily by fragmented, outcome-biased training data rather than by algorithm design. Independent measurements of endosomal escape efficiency converge on a low ceiling whose biological origin, whether lipid-specific or inherent to the mechanism, remains unknown. For organ-selective targeting, one mechanistic account rests on a hypothesis tested in advance; another, equally prominent, has not been shown to have been anticipated rather than reconstructed after the fact. Closing this gap is now the field\u2019s central methodologically priority.<\/jats:p>","DOI":"10.3390\/pharmaceutics18080991","type":"journal-article","created":{"date-parts":[[2026,8,11]],"date-time":"2026-08-11T11:51:36Z","timestamp":1786449096000},"page":"991","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Lipid Nanoparticles for Gene Therapy: Unresolved Challenges in Manufacturing, Transdermal Delivery, Machine Learning, Endosomal Escape, and the Protein Corona"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-9512-6277","authenticated-orcid":false,"given":"Ognjen","family":"Mili\u0107","sequence":"first","affiliation":[{"name":"Department of Pharmaceutical Technology and Cosmetology, Faculty of Pharmacy, University of Belgrade, 11221 Belgrade, Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8121-6924","authenticated-orcid":false,"given":"Sanela M.","family":"Savi\u0107","sequence":"additional","affiliation":[{"name":"Faculty of Technology in Leskovac, University of Ni\u0161, 16000 Leskovac, Serbia"},{"name":"R&D Sector, DCP Hemigal, 16000 Leskovac, Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-0180-8139","authenticated-orcid":false,"given":"Melanija","family":"Zurkovi\u0107","sequence":"additional","affiliation":[{"name":"Department of Pharmaceutical Technology and Cosmetology, Faculty of Pharmacy, University of Belgrade, 11221 Belgrade, Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Boban","family":"Stanojevi\u0107","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, Faculty of Pharmacy, University of Belgrade, 11221 Belgrade, Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6236-9730","authenticated-orcid":false,"given":"Sne\u017eana","family":"Savi\u0107","sequence":"additional","affiliation":[{"name":"Department of Pharmaceutical Technology and Cosmetology, Faculty of Pharmacy, University of Belgrade, 11221 Belgrade, Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1526","DOI":"10.1208\/s12249-010-9526-5","article-title":"Injectable lipid emulsions\u2014Advancements, opportunities and challenges","volume":"11","author":"Hippalgaonkar","year":"2010","journal-title":"AAPS PharmSciTech"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"100621","DOI":"10.1016\/j.advnut.2026.100621","article-title":"Bridging the gap in the clinical application of advanced parenteral nutrition formulations: From efficacy to real-world challenges","volume":"17","author":"Zhao","year":"2026","journal-title":"Adv. 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