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Related Concept Videos

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.
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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 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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Without prolonged fasting, healthy individuals maintain blood glucose levels above 3.5 mM due to a well-adapted neuroendocrine counterregulatory system that effectively prevents acute hypoglycemia, a potentially life-threatening condition. The primary clinical scenarios for hypoglycemia encompass diabetes treatment, inappropriate production of endogenous insulin or insulin-like substances by tumors, and the use of glucose-lowering agents in non-diabetic individuals. Notably, hypoglycemia in the...
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Regulation of hormone secretion is a finely tuned orchestration driven by various types of stimuli, encompassing neural, humoral, and hormonal signals. Environmental cues instigate neural stimuli, where action potentials traverse nerve fibers to reach their designated targets. An illustrative scenario is the body's response to stress, wherein the sympathetic nervous system releases epinephrine from the adrenal glands, inducing the well-known 'fight or flight' reaction.
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Updated: Jun 26, 2025

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

Maria Fleseriu1, Mirjam Christ-Crain2, Fabienne Langlois3

  • 1Department of Medicine, Division of Endocrinology, Diabetes and Clinical Nutrition, Oregon Health and Science University, Portland, OR, USA; Department of Neurological Surgery, Oregon Health and Science University, Portland, OR, USA; Pituitary Center, Oregon Health and Science University, Portland, OR, USA.

Lancet (London, England)
|May 12, 2024
PubMed
Summary
This summary is machine-generated.

Hypopituitarism, a rare pituitary hormone deficiency, is underdiagnosed but rising. Diagnosis involves hormone testing, and treatment focuses on hormone replacement, though mortality risks may persist.

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Area of Science:

  • Endocrinology
  • Neuroendocrinology
  • Pituitary Disorders

Background:

  • Partial or complete deficiency in pituitary hormone production causes various endocrine disorders.
  • Hypopituitarism is rare, underdiagnosed, with rising incidence, often due to pituitary or hypothalamic masses.
  • Other causes include genetic mutations, hypophysitis, infections, and traumatic brain injury.

Purpose of the Study:

  • To review the causes, clinical features, diagnosis, and management of hypopituitarism.
  • To highlight diagnostic challenges and treatment strategies for pituitary hormone deficiencies.
  • To emphasize the importance of specialized care for complex hypopituitarism cases.

Main Methods:

  • Review of literature on hypopituitarism.
  • Analysis of clinical features based on onset, cause, and affected pituitary axes.
  • Discussion of diagnostic criteria including basal hormone levels and stimulation tests.
  • Examination of hormone replacement therapy and associated mortality risks.

Main Results:

  • Clinical presentation varies widely depending on the specific hormone deficiencies and onset.
  • Diagnosis relies on basal hormone measurements and dynamic testing.
  • Hormone replacement is the primary treatment strategy.
  • Increased mortality may persist, particularly in specific patient groups.

Conclusions:

  • Hypopituitarism requires careful diagnosis and hormone replacement therapy.
  • Management at specialized centers is recommended for complex cases.
  • Ongoing research is needed to address persistent mortality risks.