Development of a Novel Immunoprotective Culture System for Parathyroid Allografts: Utilizing Static Magnetic Fields to Modulate Lymphocyte Migration

Parathyroid allotransplantation is a promising treatment for hypoparathyroidism, yet immune rejection and fibrosis remain significant barriers. This study evaluates a novel immunoprotective culture system utilizing a moderate-intensity static magnetic field (SMF) to modulate lymphocyte migration without compromising graft functionality. Human parathyroid cells were encapsulated and divided into 10 experimental groups, co-cultured with Jurkat T-lymphocytes, and either exposed to SMF or maintained as controls. Over 72 h, we analyzed parathormone (PTH) secretion, cell viability (via proliferation assays), and molecular expression patterns of key markers (VitDR, PTH, GCM2, and CaSR). Lymphocyte dynamics were monitored through comparative imaging and cytokine profiling (IL-1α, IL-1β, and IL-2). SMF exposure significantly altered Jurkat cell behavior; while lymphocytes in unexposed groups aggregated around microcapsules, they were effectively repelled and migrated away from the graft interface under SMF exposure. Crucially, this biophysical manipulation was safe: no significant differences in PTH secretion or viability were observed across groups. All groups maintained essential genetic markers. Our findings demonstrate that SMF exposure induces lymphocyte migration away from the capsule without compromising parathyroid cell characteristics or functionality. Integrating encapsulation with SMF represents a novel, non-pharmacological, non-invasive immunoprotective strategy for parathyroid allotransplantation, offering a technological alternative to systemic immunosuppression.