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Related Concept Videos

Inflammatory Response01:28

Inflammatory Response

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An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
Inflammation can be triggered by various stimuli, such as impact, abrasion, chemical irritation, infections, and extreme hot or cold temperatures. These can damage cells and connective tissue fibers,...
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T Cell Types and Functions01:24

T Cell Types and Functions

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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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Related Experiment Video

Updated: Jul 6, 2025

Characterization of Immune Cell-derived Extracellular Vesicles and Studying Functional Impact on Cell Environment
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Characterization of Immune Cell-derived Extracellular Vesicles and Studying Functional Impact on Cell Environment

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Aloe-derived vesicles enable macrophage reprogramming to regulate the inflammatory immune environment.

Hao Zhou1, Ke Peng2,3, Jun Wang4

  • 1Department of General Surgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China.

Frontiers in Bioengineering and Biotechnology
|January 5, 2024
PubMed
Summary

Aloe vera extracellular vesicles reprogram pro-inflammatory macrophages to an anti-inflammatory state, reducing inflammation and promoting lung repair in bacterial pneumonia models.

Keywords:
aloeextracellular vesicle nanovesiclesimmunoregulationmacrophages reprogrammingpneumonia

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Area of Science:

  • Immunology
  • Nanomedicine
  • Plant-derived therapeutics

Background:

  • Bacterial pneumonia causes significant mortality due to uncontrolled inflammation and acute lung injury.
  • Alveolar macrophages play a critical role in lung homeostasis, but excessive inflammation can lead to cell death and impaired repair.
  • Modulating macrophage phenotype is a key therapeutic strategy for bacterial pneumonia.

Purpose of the Study:

  • To investigate the potential of extracellular vesicles derived from aloe vera (AV-EVs) as a therapeutic agent for bacterial pneumonia.
  • To determine if AV-EVs can reprogram pro-inflammatory macrophages towards an anti-inflammatory phenotype.
  • To assess the safety and efficacy of AV-EVs in preclinical models.

Main Methods:

  • Biosafety of AV-EVs was evaluated using cell viability and hemolysis assays.
  • Macrophage uptake and internalization of AV-EVs were confirmed via confocal microscopy and flow cytometry.
  • In vitro and clinical bronchoalveolar lavage fluid models were used to assess macrophage repolarization by AV-EVs.

Main Results:

  • AV-EVs were found to be biosafely internalized by macrophages.
  • AV-EVs effectively reprogrammed pro-inflammatory macrophages into an anti-inflammatory phenotype.
  • This reprogramming led to increased release of anti-inflammatory cytokine IL-10, reducing inflammation and promoting tissue repair.

Conclusions:

  • Aloe vera-derived extracellular vesicles possess significant immunomodulatory properties.
  • AV-EVs demonstrate potential as a novel therapeutic strategy for bacterial pneumonia by modulating macrophage immunity.
  • Further research into AV-EVs could lead to new treatments for inflammatory lung diseases.