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Related Concept Videos

Endocrine Signaling01:45

Endocrine Signaling

68.0K
Endocrine cells produce hormones to communicate with remote target cells found in other organs. The hormone reaches these distant areas using the circulatory system. This exposes the whole organism to the hormone but only those cells expressing hormone receptors or target cells are affected. Thus, endocrine signaling induces slow responses from its target cells but these effects also last longer.
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What is the Endocrine System?00:46

What is the Endocrine System?

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The endocrine system sends hormones—chemical signals—through the bloodstream to target cells—the cells the hormones selectively affect. These signals are produced in endocrine cells, secreted into the extracellular fluid, and then diffuse into the blood. Eventually, they diffuse out of the blood and bind to target cells which have specialized receptors to recognize the hormones.
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The Endocrine System01:29

The Endocrine System

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The endocrine system is an extensive network of glands – organs or tissues in the body that create chemicals that control many bodily functions, that secrete hormones, which are chemical messengers that play essential roles in regulating various bodily functions. These hormones are secreted into the bloodstream and travel throughout the body. They require specific receptors to convey signals to cells possessing these corresponding receptors. This complex signaling mechanism ensures that...
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An Overview of the Endocrine System01:10

An Overview of the Endocrine System

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The endocrine system, a complex network of glands, orchestrates physiological balance within the body through the production and secretion of hormones. These hormones are chemical messengers in intercellular communication, acting as conduits between the secretory cells and distant target sites. They traverse the circulatory system by being released into the extracellular fluid, and their impact is specific to cells possessing receptors for a particular hormone.
The endocrine system collaborates...
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Structures of the Endocrine System00:59

Structures of the Endocrine System

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The intricate framework of the endocrine system encompasses a diverse array of glands, with their target tissues and organs strategically distributed throughout the body. Central to this network are the endocrine glands, specialized structures that lack ducts and release hormones directly into the interstitial fluid. Notably, the hypothalamus, a vital neuroendocrine organ situated in the brain, governs neural functions and serves as a potent source of hormonal regulation. Near the hypothalamus...
12.0K
Chemical Signaling in the Endocrine System01:08

Chemical Signaling in the Endocrine System

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A signaling cascade is a series of events that facilitates the transmission of information within or between cells, culminating in a targeted response in the recipient cell. As chemical messengers, hormones are pivotal in initiating and modulating these intricate signaling cascades based on their solubility.
Lipid-soluble hormones, such as steroid hormones, demonstrate an intracellular action. These hormones traverse cell membranes due to their lipid nature. Once inside the target cell, they...
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[18F]F-DOPA and [18F]F-FDG PET/CT for staging advanced medullary thyroid cancer.

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Related Experiment Video

Updated: Jan 27, 2026

Positron Emission Tomography Using 64-Copper as a Tracer for the Study of Copper-Related Disorders
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Novel PET tracers: added value for endocrine disorders.

Sébastien Bergeret1, Judith Charbit1, Catherine Ansquer2,3

  • 1Sorbonne University, Nuclear Medicine Department, Pitié-Salpêtrière Hospital, 47-83 Bd de l'Hôpital, 75013, Paris, France.

Endocrine
|March 16, 2019
PubMed
Summary

Novel PET tracers like 18F-Choline and 18F-DOPA, alongside Gallium-68 labeled somatostatin analogs (68Ga-SSA), significantly improve the localization and characterization of neuroendocrine tumors and primary hyperparathyroidism.

Keywords:
18F-Choline18F-FDG18F-FDOPAGallium-68Neuroendocrine tumorsPET/CTPrimary hyperparathyroidismSomatostatin

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Solid Phase 11C-Methylation, Purification and Formulation for the Production of PET Tracers
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Area of Science:

  • Nuclear medicine
  • Endocrinology
  • Oncology

Background:

  • Nuclear medicine has long been used for endocrine disorders.
  • Positron Emission Tomography (PET) tracers have advanced functional imaging for endocrine tumors.
  • PET enables high-performance localization, characterization, and staging of endocrine tumors.

Purpose of the Study:

  • To review the utility of novel PET tracers in endocrine disorders.
  • To highlight 18F-Choline, 18F-DOPA, and 68Ga-SSA for specific endocrine conditions.
  • To emphasize the role of these tracers in diagnosis and treatment planning.

Main Methods:

  • Review of current literature on PET tracers in endocrinology.
  • Focus on 18F-FDG, 18F-DOPA, and 18F-Choline.
  • Discussion of peptide receptor radionuclide therapy with 68Ga-SSA.

Main Results:

  • 18F-DOPA is effective for neuroendocrine tumors (NETs), including medullary thyroid carcinoma and midgut NETs.
  • 18F-Choline shows utility in primary hyperparathyroidism.
  • 68Ga-SSA facilitates a theranostic approach for NETs, aiding therapeutic choices and treatment response monitoring.

Conclusions:

  • Novel PET tracers offer significant advancements in diagnosing and managing endocrine disorders.
  • 18F-Choline, 18F-DOPA, and 68Ga-SSA are crucial tools for primary hyperparathyroidism and NETs.
  • These tracers enhance diagnostic accuracy and enable personalized theranostic strategies.