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Liposomes and pulmonary alveolar macrophages: functional and morphologic interactions
R J Gonzalez-Rothi1, L Straub, J L Cacace
1Pulmonary Division, College of Medicine, University of Florida, Gainesville.
Experimental Lung Research
|July 1, 1991
Summary
Liposomes did not harm rat lung macrophages in vitro. While some liposomes were unstable, they did not impair macrophage viability, function, or cause toxicity, despite increasing cell size.
Area of Science:
- Cell Biology
- Nanotechnology
- Toxicology
Background:
- Liposomes are widely used drug delivery systems.
- Understanding liposome interactions with lung macrophages is crucial for inhalation therapies.
Purpose of the Study:
- To investigate the in vitro toxicity and functional interactions of liposomes with rat pulmonary alveolar macrophages (AMs).
Main Methods:
- Assessed macrophage viability, phagocytic activity, adherence, and respiratory burst.
- Evaluated liposome stability and uptake of encapsulated carboxyfluorescein (CF) by AMs.
- Utilized trypan blue exclusion, yeast uptake/digestion, nitro-blue tetrazolium reduction, and computerized image analysis.
Main Results:
- Liposomes from saturated phospholipids and cholesterol were stable; unsaturated phospholipid liposomes lost content.
- Macrophage viability was unaffected, but phagocytic cell numbers decreased at high lipid concentrations.
- Increased macrophage cell surface area was observed post-liposome treatment, without affecting adherence or respiratory burst.
Conclusions:
- In vitro liposome exposure did not induce significant toxicity or aberrant morphologic/functional changes in rat alveolar macrophages.
- Liposome formulation impacts stability and uptake, but not overall macrophage toxicity under tested conditions.