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Related Concept Videos

Role of Hematopoietic Growth Factors01:28

Role of Hematopoietic Growth Factors

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Hematopoietic growth factors are molecules that regulate the differentiation rate of hematopoietic stem cells (HSCs). Erythropoietin (EPO), primarily produced by the kidneys, plays a crucial role in erythrocyte production. When oxygen levels in the blood are low, EPO is released into the bloodstream, reaching the bone marrow, where it stimulates HSCs to differentiate and mature into erythrocytes, which are vital for oxygen transport.
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Microorganisms are classified as acidophiles, neutrophiles, or alkaliphiles based on their pH growth preferences, reflecting their adaptations to specific environments. Maintaining a stable intracellular pH is critical for macromolecular stability and enzymatic activity, which can be challenged by external pH variations.Neutrophiles, such as Escherichia coli, grow optimally between pH 5.5 and 8.0. These microorganisms inhabit neutral or slightly acidic environments and employ mechanisms like...
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Microorganisms display remarkable adaptations, enabling them to thrive in diverse ecological niches across a wide range of temperatures. Temperature profoundly influences microbial growth by affecting enzymatic activity, membrane fluidity, and other cellular processes.Each microorganism operates within a specific temperature range defined by three cardinal points: minimum, optimum, and maximum. Below the minimum temperature, membranes lose fluidity, halting transport processes. Above the...
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Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.
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Related Experiment Video

Updated: Jan 31, 2026

Preparing T Cell Growth Factor from Rat Splenocytes
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Growth factor signalling in osteoarthritis.

Jian Huang1, Lan Zhao1, Di Chen1

  • 1a Department of Orthopedic Surgery , Rush University Medical Center , Chicago , IL , USA.

Growth Factors (Chur, Switzerland)
|January 10, 2019
PubMed
Summary

Osteoarthritis (OA) involves joint tissue breakdown due to dysregulated growth factor signaling. This review explores TGF-β, NGF, Hedgehog, and Wnt pathways for potential OA therapies.

Area of Science:

  • Orthopedics and Sports Medicine
  • Regenerative Medicine
  • Molecular Biology

Background:

  • Osteoarthritis (OA) is a prevalent degenerative joint disease impacting over 10% of the global population, causing significant socioeconomic burden.
  • Pathological changes in OA encompass cartilage degradation, subchondral bone thickening, osteophyte formation, synovitis, and ligament degeneration.
  • Joint homeostasis relies on a complex network of growth factors; dysregulation of their signaling pathways negatively impacts joint tissues, driving OA onset and progression.

Purpose of the Study:

  • To review the roles of four key growth factors—TGF-β, NGF, Hedgehog, and Wnt—in the pathogenesis of Osteoarthritis.
  • To discuss the clinical and translational applications of these growth factors in developing novel OA therapies.

Main Methods:

Keywords:
HedgehogNGFOsteoarthritisTGF-βWnt

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  • Literature review focusing on growth factor signaling in Osteoarthritis.
  • Analysis of current research on TGF-β, NGF, Hedgehog, and Wnt pathways in OA.
  • Examination of clinical and translational studies investigating therapeutic interventions targeting these growth factors.

    • Main Results:

    • Dysregulation of TGF-β, NGF, Hedgehog, and Wnt signaling pathways is implicated in the multifaceted pathology of Osteoarthritis.
    • These growth factors play critical roles in regulating cellular processes within multiple joint tissues affected by OA.
    • Emerging research highlights the therapeutic potential of targeting these specific pathways for OA treatment.

    Conclusions:

    • Targeting dysregulated growth factor signaling pathways presents a promising therapeutic strategy for Osteoarthritis.
    • Further research into TGF-β, NGF, Hedgehog, and Wnt pathways is crucial for advancing OA treatment modalities.
    • Understanding the complex roles of these growth factors can lead to more effective interventions for joint repair and disease management.