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Related Concept Videos

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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Target Cell Response to Hormones01:22

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Hormones intricately bind to receptors on the surface or within target cells, initiating a cascade of cellular responses.
Notably, the cellular response can be regulated by altering the number of receptors expressed in the cell. For example, prolonged exposure to elevated hormone levels results in a gradual decline or down-regulation in the number of receptors for that specific hormone on the cell surface. Conversely, in response to low hormone levels, cells may use up-regulation, producing an...
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Secondary Messengers in Hormone Action01:26

Secondary Messengers in Hormone Action

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Water-soluble hormones cannot cross the plasma membrane, so they rely on protein receptors that span the membrane to trigger intracellular signaling pathways. These pathways then activate second messengers inside the cell, including cAMP or calcium ions.
Many hormones bind to transmembrane G protein-coupled receptors that connect to regulatory G proteins. These G proteins can then activate enzymes such as adenylyl cyclase or phospholipase C. Adenylyl cyclase converts ATP to cAMP, activating...
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Regulation of Hormone Secretion01:19

Regulation of Hormone Secretion

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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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Endocrine Signaling01:45

Endocrine Signaling

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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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Cell-surface Signaling01:21

Cell-surface Signaling

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Hormones—or any molecule that binds to a receptor, known as a ligand—that are lipid-insoluble (water-soluble) are not able to diffuse across the cell membrane. In order to be able to affect a cell without entering it, these hormones bind to receptors on the cell membrane. When a first messenger, a hormone, binds to a receptor, a signal cascade is set off, causing second messengers, proteins inside the cell, to become activated, resulting in downstream effects.
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Approaches to quantify and manipulate insect hormone signals.

Fernando G Noriega1, Guy Bloch2, Martin Moos3

  • 1Faculty of Science, University of South Bohemia, Ceske Budejovice, Czech Republic; Institute of Parasitology, Biology Center of the Czech Academy of Sciences, Ceske Budejovice, Czech Republic; Department of Biological Sciences and Biomolecular Science Institute, Florida International University, Miami, FL, USA.

Current Opinion in Insect Science
|August 8, 2025
PubMed
Summary

This review covers methods for measuring insect juvenile hormones (JHs) and ecdysteroids. It also details techniques to experimentally alter these crucial insect hormones and their signaling pathways.

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Area of Science:

  • Insect Endocrinology
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Hormones are vital regulators of insect development and physiology.
  • Juvenile hormones (JHs) and ecdysteroids are key lipidic insect hormones.
  • Studying these hormones requires accurate quantification and experimental manipulation tools.

Purpose of the Study:

  • To review current methods for detecting and quantifying JHs and ecdysteroids in insect samples.
  • To outline techniques for experimentally modulating insect endocrine homeostasis.
  • To provide an overview of tools for studying JH and ecdysteroid signaling.

Main Methods:

  • Review of analytical detection methods for lipophilic hormones.
  • Discussion of chemical and genetic approaches to modulate hormone levels.
  • Integration of advances in reverse genetics techniques for endocrine manipulation.

Main Results:

  • Improved analytical methods enable feasible quantification of low-titer lipophilic hormones.
  • Development of strategies to manipulate hormonal homeostasis based on enzyme, transporter, and receptor knowledge.
  • Availability of contemporary tools for detecting, quantifying, and manipulating insect hormones.

Conclusions:

  • Accurate detection and quantification of insect hormones are achievable with modern methods.
  • Experimental manipulation of endocrine homeostasis is feasible through chemical and genetic strategies.
  • This review provides a comprehensive guide to current methodologies in insect hormone research.