Induced Pluripotent Stem Cell-Derived Parathyroid Organoids Resemble Parathyroid Morphology and Function

Area of Science:

• Stem cell biology
• Endocrinology
• Regenerative medicine

Background:

• Parathyroid glands maintain calcium homeostasis via parathyroid hormone (PTH) secretion.
• Limited parathyroid cell proliferation restricts cell therapy development.
• Human-induced pluripotent stem cells (hiPSCs) offer a potential source for cell generation.

Purpose of the Study:

• To generate functional parathyroid organoids from hiPSCs.
• To characterize the morphology, molecular profile, and function of these organoids.
• To assess the therapeutic potential of parathyroid organoids in vivo.

Main Methods:

• Differentiation of hiPSCs into parathyroid organoids over 20 days.
• Morphological analysis using stereomicroscopy, SEM, and TEM.
• Molecular characterization via RNA-Seq and LC-MS/MS.
• Functional assessment of PTH secretion and calcium signaling.
• In vivo transplantation into parathyroidectomized rats.

Main Results:

• Parathyroid organoids displayed distinct morphology and 3D cellular arrangement resembling native parathyroid tissue.
• Key parathyroid markers (CasR, CxCr4, Gcm2, PTH) were expressed at both RNA and protein levels.
• Organoids secreted PTH, exhibited calcium signaling, and induced osteogenic differentiation.
• Transplantation in rats led to elevated PTH-related markers and detected PTH secretion.

Conclusions:

• Successful generation of functional parathyroid organoids from hiPSCs.
• Demonstrated potential for parathyroid organoid transplantation to restore PTH levels.
• These findings offer a promising cellular therapy for hypoparathyroidism and other PTH-related disorders.