Novel Organoids Model Adrenal Gland Development

Researchers at the University of Pennsylvania’s School of Veterinary Medicine have engineered a lab-grown organoid that mimics the development and function of the human adrenal cortex. This model provides a new tool for studying the biology of the adrenal gland and how it forms complex tissue structures.

The project was led by Kotaro Sasaki and Michinori Mayama. The team utilized human-induced pluripotent stem cells (iPSCs) and a stepwise approach to create the organoid, which is designed to recapitulate the prenatal functional zonation dynamics of the adrenal cortex.

Understanding the Adrenal Gland’s Role

The adrenal glands are walnut-sized endocrine organs located atop the kidneys. They produce hormones that are essential for managing metabolism and the body’s response to stress.

Cortisol is one of the most significant hormones produced by these glands. It allows the body to physiologically adapt to various stressors, including emotional trauma and infection.

Despite the importance of these organs, the specific details of how the adrenal gland forms and functions have remained difficult to study. This lack of understanding has hindered the development of targeted therapies for disorders related to the adrenal glands.

Advancements in Organoid Modeling

Prior models of the adrenal gland often failed to replicate the complex organizational hierarchy of the tissue or its ability to produce cortisol. The new organoid developed by the Penn Vet team addresses these limitations by self-organizing into a layered, three-dimensional structure.

This structure exhibits key characteristics of a developing gland, providing researchers with access to tissues that are normally inaccessible for study.

The organoid has demonstrated functional responsiveness. Specifically, it produces androgens and cortisol when it reacts to adrenocorticotropic hormone (ACTH), which is the primary regulator of adrenal hormone secretion derived from the brain.

Implications for Endocrine Research

By faithfully mimicking the human adrenal cortex, this system allows for a deeper exploration of endocrine biology. The ability to observe the development and functional zonation of the gland in a lab setting may help scientists better understand the mechanisms behind adrenal-related disorders.

The development of this model represents a shift toward more precise, human-based cellular models to study organ development, reducing the reliance on models that may not accurately reflect human biological processes.