Lab-Grown Adrenal Organoid Mimics Human Stress Response in Breakthrough Study

Scientists have developed a lab-grown organoid system that mimics the human adrenal cortex. This breakthrough, published in Cell Stem Cell, recreates the outer layer of the adrenal gland—a key part of the body's stress response. The system could transform research into adrenal diseases and open new treatment possibilities. The adrenal glands are small, walnut-sized organs sitting above each kidney. They produce essential hormones, including cortisol, which helps the body adapt to stress and survive challenges. The outer layer, the adrenal cortex, plays a central role in this process.

Researchers led by Kotaro Sasaki and Michinori Mayama built the organoid using human induced pluripotent stem cells. These cells were guided to form a structure that closely resembles the early stages of human adrenal development. The resulting system is fully functional, producing cortisol, corticosterone, and androgens when stimulated by adrenocorticotropic hormone (ACTH).

The accessibility of this model allows scientists to study adrenal biology at a cellular and molecular level. It also simplifies drug testing, offering a more accurate platform than previous methods. Future work aims to expand the system to include aldosterone, another critical hormone. This organoid system provides a powerful tool for understanding adrenal disorders. It may also pave the way for cell replacement therapies, such as treatments for primary adrenal insufficiency like Addison's disease. The research marks a significant step forward in endocrine science and regenerative medicine.