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Hypothalamic-Pituitary Axis

Hypothalamic-Pituitary Axis

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.

Hormones of the Pituitary Gland

Hormones of the Pituitary Gland

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.
The most abundantly secreted hormone from the anterior lobe is the growth hormone, which controls overall growth by...

The Pituitary Gland

The Pituitary Gland

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.

Predicting Molecular Geometry

Predicting Molecular Geometry

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Prediction Intervals

Prediction Intervals

The interval estimate of any variable is known as the prediction interval. It helps decide if a point estimate is dependable.
However, the point estimate is most likely not the exact value of the population parameter, but close to it. After calculating point estimates, we construct interval estimates, called confidence intervals or prediction intervals. This prediction interval comprises a range of values unlike the point estimate and is a better predictor of the observed sample value, y.

Internal Receptors

Internal Receptors

Many cellular signals are hydrophilic and therefore cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind to internal, or intracellular, receptors that reside within the cell. Many mammalian steroid hormones use this mechanism of cell signaling, as does nitric oxide (NO) gas.

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Related Experiment Video

Updated: Feb 6, 2026

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

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

Published on: February 25, 2022

Is receptor profiling useful for predicting pituitary therapy?

Monica Marazuela¹, Ana M Ramos-Leví¹, Patricia Borges de Souza²

¹Department of Endocrinology, Hospital Universitario La Princesa, Instituto de Investigación Princesa, Universidad Autónoma de Madrid, Madrid, Spain.

European Journal of Endocrinology

|August 25, 2018

Summary

Predicting pituitary tumor treatment response is challenging. Pituitary receptor profiling shows promise but requires standardized prospective studies to confirm its clinical utility for personalized therapy.

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Area of Science:

Endocrinology
Oncology
Molecular Biology

Background:

Medical treatment of pituitary tumors faces challenges due to resistance to first-line therapies.
Identifying markers for treatment responsiveness/resistance is crucial for personalized patient management.
Pituitary receptor profiling is explored for predicting responses to somatostatin analogues and dopamine agonists.

Purpose of the Study:

To evaluate the utility and challenges of pituitary receptor profiling in predicting treatment response for pituitary tumors.
To discuss the complexities of agonist-receptor coupling and its impact on understanding pharmacological resistance.
To address the ongoing debate regarding the clinical role of pituitary receptor profiling.

Main Methods:

Review and discussion of existing literature on pituitary receptor profiling.
Analysis of factors contributing to pharmacological resistance, including receptor expression, genetic alterations, and signaling pathways.
Exploration of the role of associated proteins (e.g., cytoskeleton, Aryl hydrocarbon receptor interacting protein) in treatment outcomes.

Main Results:

Pituitary receptor profiling's utility is complex and not always straightforward due to intricate agonist-receptor interactions.
Conflicting results exist regarding the link between receptor expression, genetic factors, and treatment responsiveness.
Several molecular mechanisms, including defective receptor expression and altered signaling, contribute to variable treatment outcomes.

Conclusions:

The clinical utility of pituitary receptor profiling as a predictive factor for pituitary tumor treatment remains debated.
Further research is needed to overcome current difficulties in interpreting receptor profiling data.
Prospective studies employing standardized methods are essential to establish the efficacy of receptor profiling in clinical practice.