Related Experiment Video
Updated: Aug 10, 2026
Investigation of Macrophage Polarization Using Bone Marrow Derived Macrophages
Published on: June 23, 2013
Modulation of macrophage structure and function by low level He-Ne laser irradiation
1Biomedical Applications Section, Centre for Advanced Technology, Indore 452013, India.
Abstract:
Studies have shown that He-Ne laser irradiation can affect the biological functions of macrophages. The aim of the present study was to investigate the effect of He-Ne laser irradiation on the various functional parameters of macrophages and look for possible correlations in the effects to understand the mechanisms involved. Mice peritoneal macrophages were irradiated with a He-Ne laser (632.8 nm, approximately 10 W m(-2)) at energy densities ranging from 100 to 600 J m(-2) and the activities of lysozyme and cathepsin, phagocytosis, and cell spreading (markers of cell activation), as well as changes in NAD(P)H autofluorescence, were monitored. He-Ne laser irradiation was observed to lead to significant changes in all the parameters investigated. While lysozyme activity and spreading of the peripheral membrane were found to increase with the irradiation dose over the dose range investigated, the phagocytotic activity of macrophages, the activity of cathepsin, the observed decease in cell membrane fluidity and the observed increase in NAD(P)H level showed a peak at 200 J m(-2). Possible reasons for and the significance of the observed correlations are discussed.
Insights
Helium-neon (He-Ne) laser irradiation significantly alters macrophage functions. Optimal energy density for phagocytosis and enzyme activity was observed at 200 J m(-2), suggesting dose-dependent effects.
Area of Science:
- Biomedical Optics
- Cell Biology
- Immunology
Background:
- Helium-neon (He-Ne) laser irradiation is known to influence macrophage biological functions.
- Understanding these effects is crucial for potential therapeutic applications.
Purpose of the Study:
- To investigate the impact of He-Ne laser irradiation on macrophage functional parameters.
- To explore correlations between these effects to elucidate underlying mechanisms.
Main Methods:
- Mice peritoneal macrophages were exposed to He-Ne laser (632.8 nm) at energy densities from 100 to 600 J m(-2).
- Assessed parameters included lysozyme and cathepsin activity, phagocytosis, cell spreading, and NAD(P)H autofluorescence.
Main Results:
- Significant changes were observed across all investigated parameters.
- Lysozyme activity and cell spreading increased with irradiation dose.
- Phagocytosis, cathepsin activity, cell membrane fluidity, and NAD(P)H levels peaked at 200 J m(-2).
Conclusions:
- He-Ne laser irradiation modulates macrophage functions in a dose-dependent manner.
- Specific energy densities, particularly 200 J m(-2), show distinct effects on macrophage activation markers.
- The observed correlations provide insights into the mechanisms of laser-macrophage interactions.
