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Related Concept Videos

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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Structures of the Endocrine System00:59

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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...
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Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

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The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
Insulin and C-peptide are...
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Regulation of Hormone Secretion01:19

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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.
Humoral...
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Hormones Regulating Blood Glucose01:16

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Insulin is released by beta cells of the pancreas when blood glucose levels are high. It facilitates glucose absorption and utilization in insulin-dependent cells with insulin receptors on their plasma membranes. Insulin promotes glucose uptake by increasing the number of glucose transport proteins in the cell membrane, allowing glucose to enter the cell. As a result, glucose utilization and ATP production are enhanced.
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Insulin: Biosynthesis, Chemistry, and Preparation01:25

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The endoplasmic reticulum (ER) of pancreatic β-cells synthesizes preproinsulin, which consists of a signal peptide, A and B chains, and a C-peptide. Preproinsulin is then cleaved and folded into proinsulin, which translocates to the Golgi apparatus for sorting and packaging into secretory granules. In these granules, enzymatic clipping generates insulin and C-peptide.
Damage or functional impairment of β-cells inhibits insulin production, leading to diabetes. Diabetes treatment...
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Endocrine Diagnostics: Principles and Applications.

Brian K Petroff1, Ronan Eustace2, Kimberly A Thompson2

  • 1Department of Pathobiology and Diagnostic Investigation, College of Veterinary Medicine, Michigan State University, MI, USA; Veterinary Diagnostic Laboratory, College of Veterinary Medicine, Michigan State University, East Lansing, MI, USA.

The Veterinary Clinics of North America. Exotic Animal Practice
|October 16, 2024
PubMed
Summary
This summary is machine-generated.

Endocrine diagnostics in exotic animals are challenging due to limited validated immunoassays. Newer methods like LC-MS/MS show promise but require further development for broad species application.

Keywords:
DiagnosticsEndocrinologyHormoneWildlifeZoo

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Area of Science:

  • Veterinary endocrinology
  • Comparative diagnostics
  • Analytical chemistry

Background:

  • Current endocrine diagnostics rely on immunoassays, which are often unvalidated for non-model species.
  • Measuring hormone concentrations in zoo, wildlife, and zoologic companion animals presents significant challenges.
  • Lack of species-specific reference intervals complicates accurate interpretation of diagnostic results.

Purpose of the Study:

  • To review the challenges and strategies for endocrine diagnostics in non-traditional animal species.
  • To evaluate the potential of newer analytical techniques for endocrine testing in diverse animal populations.
  • To highlight the limitations and future directions in comparative endocrinology diagnostics.

Main Methods:

  • Review of current immunoassay limitations for endocrine diagnostics in various animal species.
  • Discussion of established strategies for endocrine testing in zoo and wildlife populations.
  • Exploration of emerging techniques, specifically liquid chromatography-tandem mass spectrometry (LC-MS/MS).

Main Results:

  • Immunoassays frequently lack validation and species-specific reference intervals for many animal species.
  • Existing strategies for endocrine testing in exotic animals require careful interpretation of results.
  • Liquid chromatography-tandem mass spectrometry (LC-MS/MS) offers potential for broader species applicability but faces technical challenges.

Conclusions:

  • Accurate endocrine diagnostics in non-conventional species remain a significant hurdle.
  • While LC-MS/MS presents a promising alternative, further technical development is necessary.
  • Improved diagnostic assays and validated reference intervals are crucial for advancing veterinary endocrinology in diverse animal populations.