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Published on: June 10, 2014
Control of Liposomal Penetration into Three-Dimensional Multicellular Tumor Spheroids by Modulating Liposomal
Yuki Takechi-Haraya1, Yukihiro Goda1, Kumiko Sakai-Kato1
1Division of Drugs, National Institute of Health Sciences , 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan.
Abstract:
Effective penetration of drug-carrying nanoparticles into solid tumors is a major challenge in cancer therapy. Exploration of the physicochemical properties of nanoparticles that affect penetration efficiency is required to achieve maximum therapeutic effects. Here, we used confocal laser scanning microscopy to evaluate the efficiencies of penetration of fluorescently labeled liposomes into three-dimensional spheroids composed of HeLa cells. The prepared liposomes were composed of phosphatidylcholines and varying contents of cholesterol and/or a polyethylene glycol-modified phospholipid. We demonstrated that the efficiency of penetration into spheroids increased with the bending modulus (i.e., membrane rigidity) of the liposome, as determined by atomic force microscopy (correlation coefficient, 0.84). To clarify the mechanism by which membrane rigidity contributes to the penetration behavior of liposomes, we also analyzed the cellular uptake using monolayer cells. We showed that penetration efficiency was explained partially by cellular uptake efficiency, but that other factors such as liposome diffusion efficiency in the intercellular space of tumor spheroids contributed. Our results quantitatively demonstrate that the bending modulus of the liposomal membrane is a major determinant of liposomal penetration into three-dimensional spheroids. The present study will contribute to the understanding and control of tumor penetration of liposomal formulations.
Insights
Liposome membrane rigidity significantly enhances drug nanoparticle penetration into solid tumors. Optimizing liposome bending modulus is key for effective cancer therapy delivery.
Area of Science:
- Biomedical Engineering
- Materials Science
- Cancer Therapy
Background:
- Effective drug delivery to solid tumors is hindered by nanoparticle penetration challenges.
- Understanding nanoparticle physicochemical properties is crucial for optimizing cancer therapeutics.
Purpose of the Study:
- To investigate the impact of liposome physicochemical properties on tumor spheroid penetration.
- To determine the role of liposome membrane rigidity in drug delivery efficiency.
Main Methods:
- Confocal laser scanning microscopy to assess liposome penetration into 3D HeLa cell spheroids.
- Atomic force microscopy to measure liposome bending modulus (membrane rigidity).
- Analysis of cellular uptake in monolayer cells to elucidate penetration mechanisms.
Main Results:
- Liposome penetration efficiency into spheroids positively correlated with membrane rigidity (bending modulus).
- Cellular uptake efficiency partially explained penetration, with liposome diffusion in intercellular spaces also being a factor.
- A strong correlation (0.84) was found between bending modulus and penetration efficiency.
Conclusions:
- Liposome bending modulus is a critical determinant of nanoparticle penetration into three-dimensional tumor spheroids.
- This study provides quantitative insights for controlling liposomal formulation penetration for improved cancer treatment.
- Findings aid in the rational design of drug-carrying nanoparticles for enhanced tumor targeting.
