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Towards an In Vitro 3D Model for Photosynthetic Cancer Treatment: A Study of Microalgae and Tumor Cell Interactions
Christopher Holmes1, Juan Varas2, Sebastián San Martín2
1Institute for Biological and Medical Engineering, Schools of Engineering, Medicine and Biological Sciences, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago 7821093, Chile.
Abstract:
As hypoxic tumors show resistance to several clinical treatments, photosynthetic microorganisms have been recently suggested as a promising safe alternative for oxygenating the tumor microenvironment. The relationship between organisms and the effect microalgae have on tumors is still largely unknown, evidencing the need for a simple yet representative model for studying photosynthetic tumor oxygenation in a reproducible manner. Here, we present a 3D photosynthetic tumor model composed of human melanoma cells and the microalgae Chlamydomonas reinhardtii, both seeded into a collagen scaffold, which allows for the simultaneous study of both cell types. This work focuses on the biocompatibility and cellular interactions of the two cell types, as well as the study of photosynthetic oxygenation of the tumor cells. It is shown that both cell types are biocompatible with one another at cell culture conditions and that a 10:1 ratio of microalgae to cells meets the metabolic requirement of the tumor cells, producing over twice the required amount of oxygen. This 3D tumor model provides an easy-to-use in vitro resource for analyzing the effects of photosynthetically produced oxygen on a tumor microenvironment, thus opening various potential research avenues.
Insights
Researchers developed a 3D tumor model using melanoma cells and microalgae to study oxygenation. This model shows microalgae can safely oxygenate tumors, offering a promising new avenue for cancer treatment research.
Area of Science:
- Biomedical Engineering
- Cancer Research
- Microbiology
Background:
- Hypoxic tumors resist treatment, necessitating novel oxygenation strategies.
- Photosynthetic microorganisms offer a potential safe method for tumor microenvironment oxygenation.
- A reproducible model is needed to study microalgae-tumor interactions and oxygenation.
Purpose of the Study:
- To develop and validate a 3D photosynthetic tumor model.
- To assess the biocompatibility and cellular interactions between human melanoma cells and *Chlamydomonas reinhardtii*.
- To investigate the efficacy of microalgae-mediated oxygenation in a tumor model.
Main Methods:
- Constructed a 3D tumor model using human melanoma cells and *Chlamydomonas reinhardtii* in a collagen scaffold.
- Evaluated biocompatibility and cellular interactions under cell culture conditions.
- Quantified oxygen production by microalgae to meet tumor cell metabolic demands.
Main Results:
- Confirmed biocompatibility between melanoma cells and *Chlamydomonas reinhardtii*.
- Established that a 10:1 microalgae-to-cell ratio meets tumor cell oxygen requirements.
- Demonstrated oxygen production exceeding twice the metabolic needs of tumor cells.
Conclusions:
- The 3D photosynthetic tumor model is a viable tool for studying microalgae-based tumor oxygenation.
- This model facilitates research into the effects of photosynthetically produced oxygen on tumor microenvironments.
- The findings open new avenues for developing innovative cancer therapies targeting tumor hypoxia.
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