{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"bioRxiv"}],"indexed":{"date-parts":[[2026,10,26]],"date-time":"2026-10-26T18:32:35Z","timestamp":1793039555036,"version":"4.5.0"},"posted":{"date-parts":[[2026,5,1]]},"group-title":"Bioengineering","reference-count":24,"publisher":"openRxiv","license":[{"start":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T00:00:00Z","timestamp":1777593600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/www.biorxiv.org\/about\/FAQ#license"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2026,5,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                <jats:p>Pediatric cancer survivors treated with gonadotoxic chemotherapy or radiation face lifelong premature ovarian insufficiency (POI), leading to elevated risk of cardiovascular disease, osteoporosis, and metabolic dysfunction. Pharmacological hormone replacement therapy (HRT) cannot replicate the pulsatile, bidirectional signaling of the hypothalamic-pituitary-gonadal (HPG) axis, leaving a critical therapeutic gap. Immune-isolating hydrogel capsules offer a promising strategy for the implantation of donor ovarian tissue without immunosuppression yet they require optimization for human applications. Here, we engineer a microporous immune-isolating capsule by incorporating thermosensitive gelatin microgels as sacrificial porogens. Microfluidic fabrication yielded monodisperse microgels that dissolved at 37\u00b0C generating disconnected micropores within a non-degradable poly(ethylene glycol) (PEG) matrix. Critically, the diffusion of FSH-scale analogs (40 kDa) increased by almost two-fold through the microporous capsules relative to nanoporous controls, while antibody-scale molecules (150 kDa) were blocked, demonstrating size-discriminating permeability. In ovariectomized mice implanted with encapsulated ovarian xenografts for 20 weeks, microporous capsules restored dynamic HPG-axis signaling evidenced by elevated levels of estradiol and progesterone, FSH suppression, and fluctuating hormone levels that resembled physiological patterns. Microporosity also improved graft viability, increasing stromal cellularity and reducing follicular apoptosis. These findings support microporous immune-isolating capsules as a platform for physiologically authentic therapy for POI.<\/jats:p>","DOI":"10.64898\/2026.04.28.721364","type":"posted-content","created":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T17:40:17Z","timestamp":1777657217000},"source":"Crossref","is-referenced-by-count":1,"title":["Microporous Immune-Isolating Capsule with Improved Diffusion for Restored Dynamic Bidirectional Hormone Signaling in a Murine Model of Premature Ovarian Insufficiency"],"prefix":"10.64898","author":[{"given":"Delaney S.","family":"Sinko","sequence":"first","affiliation":[{"name":"Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Margaret A.","family":"Brunette","sequence":"additional","affiliation":[{"name":"Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA"},{"name":"Division of Pediatric and Adolescent Gynecology, Eunice Kennedy Shover National Institute of Child Health and Human Development, Bethesda, MD, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2156-3561","authenticated-orcid":false,"given":"Despina I.","family":"Pavlidis","sequence":"additional","affiliation":[{"name":"Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Monica A.","family":"Rionda","sequence":"additional","affiliation":[{"name":"Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bipasha","family":"Ray","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Michigan, Ann Arbor, MI, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michelle","family":"Tong","sequence":"additional","affiliation":[{"name":"Department of Materials Science Engineering, University of Michigan, Ann Arbor, MI, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Suhani","family":"Thakur","sequence":"additional","affiliation":[{"name":"Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2785-1070","authenticated-orcid":false,"given":"Brendon","family":"Baker","sequence":"additional","affiliation":[{"name":"Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vasantha","family":"Padmanabhan","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, MI, USA"},{"name":"Department of Pediatrics, University of Michigan, Ann Arbor, MI, USA"},{"name":"Department of Molecular and Integrative Physiology, Ann Arbor, MI, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ariella","family":"Shikanov","sequence":"additional","affiliation":[{"name":"Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA"},{"name":"Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, MI, USA"},{"name":"Program in Cellular and Molecular Biology, University of Michigan, Ann Arbor, MI, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"54368","reference":[{"key":"2026050513500553000_2026.04.28.721364v1.1","doi-asserted-by":"publisher","DOI":"10.3322\/caac.21763"},{"key":"2026050513500553000_2026.04.28.721364v1.2","doi-asserted-by":"publisher","DOI":"10.1210\/jc.2016-3723"},{"key":"2026050513500553000_2026.04.28.721364v1.3","unstructured":"Ruan, X. et al. 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