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Related Concept Videos

The Pituitary Gland01:17

The Pituitary Gland

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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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Hormones of the Pituitary Gland01:27

Hormones of the Pituitary Gland

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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.
The most abundantly secreted hormone from the anterior lobe is the growth hormone, which controls overall growth by...
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Major Hormones and Their Functions01:27

Major Hormones and Their Functions

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Hormones, the biochemical messengers produced by endocrine glands, are pivotal in regulating bodily functions and maintaining homeostasis. Each hormone's balance is crucial; imbalances can lead to significant physiological disruptions. Major hormones include oxytocin, cortisol, epinephrine, estrogen, testosterone, thyroxine, growth hormone, insulin, and glucagon.
Oxytocin, produced in the hypothalamus and released by the pituitary gland, plays a role in social bonding, childbirth, and...
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Hypothyroidism II: Pathophysiology01:23

Hypothyroidism II: Pathophysiology

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Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...
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Cushing Syndrome I: Introduction01:26

Cushing Syndrome I: Introduction

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Cushing syndrome refers to the collection of clinical manifestations that arise when tissues are exposed to excessive amounts of cortisol or cortisol-like medications over an extended period. Cortisol, a glucocorticoid produced by the adrenal cortex, regulates metabolism, immune responses, and the body’s adaptation to stress. When its concentration remains chronically elevated, these physiological pathways become dysregulated, resulting in the characteristic features of the...
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Cushing Syndrome II: Pathophysiology01:19

Cushing Syndrome II: Pathophysiology

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Cortisol production is normally governed by the hypothalamic–pituitary–adrenal (HPA) axis, which maintains hormonal balance through tightly regulated feedback mechanisms. Disruption of this regulatory system is central to the development of Cushing syndrome, whether the excess cortisol originates from external medications or internal pathology. Persistent cortisol elevation alters metabolism, immune function, and endocrine signaling, producing the characteristic clinical features...
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Related Experiment Video

Updated: May 4, 2026

Endoscopic Endonasal Trans-sphenoidal Approach: Minimally Invasive Surgery for Pituitary Adenomas
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Endoscopic Endonasal Trans-sphenoidal Approach: Minimally Invasive Surgery for Pituitary Adenomas

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Clinically nonfunctioning pituitary tumors are monoclonal in origin.

J M Alexander1, B M Biller, H Bikkal

  • 1Division of Medicine, Massachusetts General Hospital, Boston 02114.

The Journal of Clinical Investigation
|July 1, 1990
PubMed
Summary

Nonfunctioning pituitary adenomas, common tumors, originate from a single cell. This study used genetic analysis to confirm their monoclonal origin, suggesting somatic mutations drive their development.

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Area of Science:

  • Endocrinology
  • Oncology
  • Genetics

Background:

  • Clinically nonfunctioning pituitary adenomas represent 25-30% of all pituitary tumors.
  • The exact cause of pituitary neoplasia remains largely unknown.
  • Distinguishing between polyclonal and monoclonal tumor origins is crucial for understanding pathogenesis.

Purpose of the Study:

  • To investigate the clonal origin of nonfunctioning pituitary adenomas.
  • To determine if these tumors arise from a single aberrant cell (monoclonal) or multiple cells (polyclonal).

Main Methods:

  • Utilized X-linked restriction fragment length polymorphisms (X-RFLP) at the phosphoglycerate kinase (PGK) and hypoxanthine phosphoribosyl-transferase (HPRT) genes.
  • Employed restriction enzymes to differentiate between maternal and paternal X-chromosomes.
  • Combined with methylation-sensitive restriction enzyme analysis to assess X-inactivation patterns in six pituitary adenoma samples.

Main Results:

  • All six analyzed pituitary adenomas exhibited a monoclonal pattern of X-inactivation.
  • This indicates that each tumor likely originated from a single progenitor cell.

Conclusions:

  • Nonfunctioning pituitary adenomas are unicellular in origin.
  • The findings support the hypothesis that somatic mutations are the underlying cause of these pituitary tumors.