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The small, pea-sized pituitary gland is located at the base of the brain. It is crucial in regulating various bodily functions, from growth to reproduction. The gland is divided into the anterior lobe and the posterior lobe. The secretory cell clusters in the pars distalis of the anterior pituitary lobe are controlled by hypothalamic regulators and synthesize six primary hormones.
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Related Experiment Video

Updated: Jun 11, 2026

Development of Organoids from Mouse Pituitary as In Vitro Model to Explore Pituitary Stem Cell Biology

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Published on: February 25, 2022

Stem cells, differentiation and cell cycle control in pituitary.

Jacques Drouin, Steve Bilodeau, Audrey Roussel-Gervais

Frontiers of Hormone Research

|July 10, 2010

Summary

Pituitary organ development relies on cell cycle control, with p57Kip2 regulating progenitor cell cycle exit and p27Kip1 preventing differentiated cell re-entry. These processes appear independent of cell differentiation.

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Area of Science:

Developmental biology
Endocrinology
Cell cycle regulation

Background:

The pituitary gland serves as a model for organogenesis, but mechanisms controlling its size, cell number, and lineage allocation remain unclear.
While transcription factors illuminate differentiation, integrating these with organ development control is crucial.
Pituitary stem cells suggest adult maintenance mechanisms, emphasizing cell cycle control's role in progenitor and differentiated cell numbers.

Purpose of the Study:

To investigate the mechanisms governing progenitor cell cycle exit and differentiated cell cycle re-entry during early pituitary development.
To determine the roles of cell cycle inhibitors p57Kip2 and p27Kip1 in pituitary organogenesis.
To explore the independence of cell cycle control from differentiation processes in the pituitary.

Main Methods:

Analysis of cell cycle control mechanisms in early pituitary development.
Investigating the function of cell cycle inhibitors p57Kip2 and p27Kip1.
Examining the relationship between cell differentiation and cell cycle regulation.

Main Results:

Progenitor cell cycle exit in early pituitary development is critically dependent on the cell cycle inhibitor p57Kip2.
Cell cycle control appears independent of differentiation, suggesting distinct regulatory pathways.
p57Kip2 is involved in progenitor cell cycle exit, while p27Kip1 prevents differentiated cell re-entry, revealing a transient intermediate stage.

Conclusions:

Separate regulatory mechanisms control pituitary cell differentiation and cell cycle.
p57Kip2 and p27Kip1 play distinct roles in regulating cell cycle progression in progenitor and differentiated pituitary cells, respectively.
These findings reveal a transient intermediate cell population and highlight the complexity of pituitary organ development.