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Related Concept Videos

Zygotic Development And Stem Cell Formation01:10

Zygotic Development And Stem Cell Formation

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The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...
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Modeling human prenatal adrenocortical functional zonation dynamics from pluripotent stem cells.

Michinori Mayama1, Eoin C Whelan1, Takeshi Sato2

  • 1Department of Biomedical Sciences, University of Pennsylvania, School of Veterinary Medicine, Philadelphia, PA 19104, USA; Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.

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Researchers developed a human stem cell-derived adrenal organoid model that mimics steroid hormone production and development. This model aids in understanding adrenal diseases and developing regenerative therapies.

Keywords:
adrenocortical organoidsandrogendefinitive zonefetal zonefunctional zonationglucocorticoidshuman adrenal developmentpluripotent stem cellssteroidogenesistransitional zone

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Area of Science:

  • Endocrinology
  • Developmental Biology
  • Stem Cell Biology

Background:

  • The adrenal cortex exhibits a complex zonal architecture essential for steroid hormone production.
  • This architecture arises from the differentiation of progenitor cells within a specific niche.

Purpose of the Study:

  • To establish a human pluripotent stem cell-derived adrenal organoid system that recapitulates adrenal cortex development.
  • To investigate the signaling pathways and genetic factors involved in adrenal zonation and differentiation.
  • To provide a platform for studying adrenal diseases and developing regenerative strategies.

Main Methods:

  • Utilized human pluripotent stem cells to generate adrenal organoids.
  • Investigated the roles of RSPO3/WNT signaling and ACTH in adrenal progenitor specification and differentiation.
  • Studied the effects of NR0B1 loss on adrenal development, modeling X-linked adrenal hypoplasia congenita.
  • Reconstituted adrenal zonation in vivo by encapsulating definitive zone cells with capsule cells.

Main Results:

  • The organoid system faithfully recapitulates human adrenal development, including zonal architecture and steroid hormone production (cortisol and androgens).
  • RSPO3/WNT signaling from the capsule specifies definitive zone progenitors.
  • Loss of NR0B1 leads to impaired definitive zone specification and direct conversion to the fetal zone, mimicking congenital adrenal hypoplasia.
  • Encapsulated organoids demonstrated ACTH responsiveness and produced key adrenal hormones in vivo.

Conclusions:

  • The developed adrenal organoid platform is a powerful tool for dissecting human adrenal development.
  • This model provides insights into the mechanisms underlying adrenal zonation and diseases like X-linked adrenal hypoplasia congenita.
  • The organoid system lays the foundation for regenerative medicine approaches to adrenal disorders.