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Related Concept Videos

Hypothalamic-Pituitary Axis01:37

Hypothalamic-Pituitary Axis

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The response to stress—be it physical or psychological, acute or chronic—involves activation of the Hypothalamic-Pituitary-Adrenal (HPA) axis. The HPA axis is part of the neuroendocrine system because it involves both neuronal and hormonal communication. Its function is to regulate homeostatic systems—metabolic, cardiovascular, and immune—providing the necessary means to respond to a stressor.
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Epigenetic Regulation01:46

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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Hormones of the Pituitary Gland01:27

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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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The Pituitary Gland01:17

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The pituitary is a small endocrine organ in the sphenoid bone under the hypothalamus. Primarily, the pituitary in adults has two distinct anatomical and functional regions— the anterior and posterior lobes. During human fetal development, a third pituitary gland region called the pars intermedia atrophies and disappears. However, some of its cells migrate and exist adjacent to the anterior pituitary in adults.
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Control System Problem01:21

Control System Problem

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In an open-loop system, such as a basic thermostat, the poles of the transfer function influence the system's response but do not determine its stability. However, when feedback is introduced to form a closed-loop system, such as an advanced thermostat that adjusts heating based on room temperature, stability is governed by the new poles of the closed-loop transfer function.
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Related Experiment Video

Updated: Jan 20, 2026

Development of Organoids from Mouse Pituitary as In Vitro Model to Explore Pituitary Stem Cell Biology
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Epigenetic control in pituitary tumors.

Shereen Ezzat1

  • 1Department of Medicine, University of Toronto, Toronto, Ontario, Canada.

Endocrine Journal
|July 17, 2008
PubMed
Summary

Epigenetic changes like DNA and histone modifications drive pituitary tumors. This review explores how these mechanisms, particularly involving FGFR2 and MAGE systems, contribute to tumor development and offers therapeutic insights.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Genetics

Background:

  • Epigenetic dysregulation is common in human pituitary tumors.
  • The precise mechanisms driving these epigenetic changes remain unclear.
  • Understanding these alterations is crucial for pituitary tumor research.

Purpose of the Study:

  • To review DNA and histone modifications in pituitary tumorigenesis.
  • To explore the interplay between epigenetic mechanisms and chromatin remodeling.
  • To highlight the role of specific molecular pathways, such as FGFR2 and MAGE, in pituitary cancer.

Main Methods:

  • Review of existing literature on epigenetics and pituitary tumors.
  • Analysis of DNA and histone modification pathways.
  • Examination of enzyme dynamics in epigenetic regulation.

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  • Case study using the fibroblast growth factor receptor 2 (FGFR2) and melanoma-associated antigen (MAGE) system.

    • Main Results:

    • DNA and histone modifications act as independent yet interconnected regulators of chromatin.
    • Enzymes involved in these modifications exhibit dynamic properties.
    • The p53-regulating MAGE system, influenced by FGFR2, plays a role in pituitary cells.
    • These epigenetic alterations have significant pathogenetic implications.

    Conclusions:

    • Epigenetic mechanisms are key drivers of pituitary tumorigenesis.
    • Further research into these pathways may reveal novel therapeutic targets.
    • Targeting epigenetic modifications could offer new treatment strategies for pituitary tumors.