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Related Concept Videos

Major Hormones and Their Functions01:27

Major Hormones and Their Functions

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 lactation.
Types of Hormones01:21

Types of Hormones

Hormones are classified into four main groups: steroids, eicosanoids, amino acid-based derivatives, and peptide hormones.
Steroids and eicosanoids fall under the category of lipid-soluble hormones. Steroids are derived from cholesterol and feature four interconnected carbon rings with variable side chains. Notable examples include estradiol from ovaries and testosterone from testes, exemplifying the critical roles of these lipid-soluble hormones in reproductive physiology. Eicosanoids, derived...
Types of Hormones02:13

Types of Hormones

Hormones can be classified into three main types based on their chemical structures: steroids, peptides, and amines. Their actions are mediated by the specific receptors they bind to on target cells.
Target Cell Response to Hormones01:22

Target Cell Response to Hormones

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...
Prodrugs01:30

Prodrugs

Prodrugs are a class of pharmaceutical compounds that undergo a biotransformation process within the body to be converted into a pharmacologically active drug. Prodrugs are designed to improve the therapeutic properties of the parent drug, such as enhancing bioavailability, increasing stability, or reducing toxicity. The concept of prodrugs revolves around modifying the chemical structure of the original drug to make it more effective or convenient for administration.
Prodrugs help overcome...
Transducer Mechanism: Nuclear Receptors01:31

Transducer Mechanism: Nuclear Receptors

Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:

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Related Experiment Video

Updated: Jul 6, 2026

Establishment of Rat Models Mimicking Gender-affirming Hormone Therapies
06:24

Establishment of Rat Models Mimicking Gender-affirming Hormone Therapies

Published on: January 10, 2025

Prohormones: their clinical relevance.

H E Wilson1, A White

  • 1Endocrine Sciences Research Group, and Departments of Medicine and Child Health, University of Manchester, Manchester, UK.

Trends in Endocrinology and Metabolism: TEM
|April 15, 2008
PubMed
Summary
This summary is machine-generated.

Prohormone convertases process peptide hormone precursors into active forms. Further research is needed to understand the roles of different processing pathways and the clinical significance of circulating prohormones.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Endocrinology

Background:

  • Peptide hormones and neuropeptides are synthesized as precursors (prohormones).
  • Prohormones undergo specific cleavage by prohormone convertases to become biologically active peptides.
  • Recent advancements have improved understanding of prohormone convertase function and action.

Purpose of the Study:

  • To review the progress in understanding prohormone processing.
  • To highlight the functional information gained from knockout technology and gene mutations.
  • To identify remaining central questions regarding prohormone processing and bioactivity.

Main Methods:

  • Review of existing literature.
  • Analysis of data from knockout technology.
  • Examination of clinical examples of gene mutations.

Main Results:

  • Significant progress in understanding prohormone convertases and their mechanisms.
  • Functional insights into prohormone cleavage disruption and bioactivity.
  • Identified clinical relevance of circulating prohormones, including adrenocorticotrophin (ACTH) precursors and proinsulin.

Conclusions:

  • The relative importance of different processing pathways and enzymes remains to be fully elucidated.
  • Comparison of serum prohormone concentrations versus mature hormone levels requires further investigation.
  • The biological consequences of circulating prohormones need comprehensive study.