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Tacrolimus (TAC), despite being a potent immunosuppressant, has limitations; its systemic adverse effects include nephrotoxicity, neurotoxicity, and high variability in tissue exposure in patients. Currently available therapeutic options are limited by the lack of targeted and localized drug delivery systems, resulting in ineffective control over drug-release behavior. Moreover, TAC being highly lipophilic poses challenges for formulation development. To address these gaps, this study focuses on developing a thermoresponsive hydrogel platform comprising distinct nanocarriers for localized delivery of TAC. The nanocarriers include nanoemulsion (NE) and micelles as TAC carriers, and their particle sizes are specifically engineered at the nanoscale for differential release behavior and to support immune cell targeting (macrophages and T-cells). Incorporation into a thermoresponsive hydrogel matrix enables it to act as a local depot at the injection site and deliver TAC with a slow, extended-release profile. Methods: TAC was loaded into a coconut-rich lipid-phase-based NE via high-pressure microfluidization. Simultaneously, TAC-loaded micelles were optimized using a full-factorial design of experiments (DoE) and manufactured via the thin-film hydration method. Both nanocarriers were evaluated for long-term colloidal stability assessments. Hydrogels were produced maintaining aseptic conditions for sterile batch production. Rheological characterization was performed to assess sol-gel transition, thermoreversibility, and injectability, and in vitro release studies were conducted to evaluate TAC diffusion from the developed nanoformulations. Results: Developed nanocarriers resulted in distinct particle sizes in NE (80\u201385 nm) and micelles (15\u201317 nm) with successful TAC loading maintaining long-term colloidal stability. The developed TAC-loaded dual-nanocarrier hydrogel (Dual-HG) showed thermoresponsive behavior and gelation at 37 \u00b0C, forming as a local depot. In vitro release studies showed slow and extended tacrolimus release from hydrogels and demonstrated particle size-dependent release behavior between the NE and micelle. Conclusions: Therefore, our study highlights a novel dual nanocarrier hydrogel platform combining TAC-NE and TAC-micelle for localized delivery. The findings support that nanocarriers can be engineered to modulate drug diffusion behavior. Notably, the dual nanocarrier within a thermoresponsive hydrogel platform can be used to deliver one or multiple drugs locally, minimizing systemic exposure when sustained local immunosuppression is required. The 25 mL scale sterile batch production of hydrogels emphasizes their suitability for future translational applications.<\/jats:p>","DOI":"10.3390\/pharmaceutics18060701","type":"journal-article","created":{"date-parts":[[2026,6,8]],"date-time":"2026-06-08T07:43:02Z","timestamp":1780904582000},"page":"701","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Injectable Thermoresponsive Dual Nanocarrier Hydrogel for Local Tacrolimus Delivery with a Two-Phase Release Profile"],"prefix":"10.3390","volume":"18","author":[{"given":"Sanjida Ahmed","family":"Srishti","sequence":"first","affiliation":[{"name":"School of Pharmacy, Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paromita Paul","family":"Pinky","sequence":"additional","affiliation":[{"name":"School of Pharmacy, Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Diponkor Kumar","family":"Shill","sequence":"additional","affiliation":[{"name":"School of Pharmacy, Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vidya","family":"Surti","sequence":"additional","affiliation":[{"name":"School of Pharmacy, Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jelena M.","family":"Janjic","sequence":"additional","affiliation":[{"name":"School of Pharmacy, Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,6,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Akbarzadeh, R., Humrich, J.Y., N\u00e9meth, T., and Amber, K.T. 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