Related Experiment Video
Updated: Nov 4, 2025
06:40
Seven Steps to Stellate Cells
Published on: May 10, 2011
34.3K
Hepatic stellate cell-derived exosomes modulate macrophage inflammatory response.
Jennifer H Benbow1, Emilio Marrero2, Rachel M McGee1
1Liver Pathobiology Laboratory, Department of Internal Medicine, Carolinas Medical Center, Atrium Health, Charlotte, NC, 28203, USA.
Experimental Cell Research
|May 29, 2021
Summary
Hepatic stellate cell-derived exosomes (HSC-EXOs) stimulate macrophages to release cytokines and enhance migration, offering potential therapeutic targets for liver fibrosis. This study characterizes HSC-EXO release and their impact on immune cells.
Area of Science:
- Hepatology
- Cell Biology
- Immunology
Background:
- Hepatic stellate cell (HSC) activation is crucial in liver fibrosis and immune responses to liver injury.
- Exosomes (EXOs) mediate intercellular communication, playing a role in this process.
Purpose of the Study:
- To characterize exosome release from HSCs.
- To investigate the effects of HSC-derived exosomes on macrophage cytokine release and function.
Main Methods:
- Analyzed exosome expression and localization in a rat liver fibrosis model.
- Assessed microRNA profiles of exosomes from quiescent and activated HSCs (rat, mouse, human).
- Investigated the impact of activated HSC-EXOs on macrophage cytokine (IL-6, TNFα) production and migration.
Main Results:
- HSC activation increased exosome production in vivo and in vitro.
- Activated HSC-EXOs altered microRNA profiles and stimulated IL-6 and TNFα release in mouse and human macrophages.
- Human HSC-EXOs promoted macrophage migration, mimicking the effects of IL-6 and TNFα.
Conclusions:
- HSC-derived exosomes interact with macrophages, promoting cytokine release and migration.
- Understanding exosome interactions in liver inflammation and fibrosis can lead to novel diagnostic and therapeutic strategies.
Related Concept Videos
01:36Overview of Exosomes
3.1K
Exosomes are stable, lipid bilayer-enclosed vesicles capable of crossing biological barriers. They can carry a wide range of molecules required for intercellular communication. Once exosomes are released from the cell where they originated, they enter a recipient cell through various pathways such as fusion, receptor-mediated endocytosis, macropinocytosis, and phagocytosis.
Stahl et al. discovered exosomes in 1983, but the exosomes were initially considered waste products released from the...
Stahl et al. discovered exosomes in 1983, but the exosomes were initially considered waste products released from the...
3.1K
01:01Regulation of Hematopoietic Stem Cells
3.6K
All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
3.6K
01:28Inflammatory Response
14.2K
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,...
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,...
14.2K