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The multilayered postconfluent cell culture as a model for drug screening
J M Padrón1, C L van der Wilt, K Smid
1Department of Medical Oncology, University Hospital Vrije Universiteit, Amsterdam, The Netherlands.
Critical Reviews in Oncology/Hematology
|October 18, 2000
Summary
Multilayer cell cultures offer a simple, 3D in vitro model for anticancer drug screening. This model better predicts in vivo drug activity against solid tumors than traditional monolayer cultures, reducing animal testing.
Area of Science:
- Biomedical Sciences
- Oncology
- Cell Biology
Background:
- Developing new anticancer drugs requires in vitro models that accurately mimic in vivo conditions for solid tumors.
- Current monolayer cell cultures have limitations in predicting drug efficacy and reducing animal use in preclinical studies.
- A need exists for simpler, more predictive in vitro models for drug screening against solid tumors.
Purpose of the Study:
- To review the characteristics and applications of the multilayered postconfluent cell culture model for anticancer drug development.
- To compare the multilayer model with traditional monolayer cultures, spheroids, and in vivo solid tumor responses.
- To assess the utility of the multilayer model in predicting drug cytotoxicity, drug transport, and combination therapy efficacy.
Main Methods:
- Utilized solid tumor cell lines grown in V-bottomed microtiter plates to form multilayered postconfluent cultures.
- Employed the sulforodamine B (SRB) assay for semiautomated assessment of cell growth and viability.
- Conducted comparative analyses of cell-cycle, gene/protein expression, drug transport, accumulation, retention, and cytotoxicity between monolayer and multilayer cultures.
Main Results:
- Multilayer cultures exhibited altered cell morphology, reduced S-phase arrest, decreased expression of cell-cycle proteins, and lower nucleotide pools compared to monolayers.
- Drug transport, accumulation, and retention were distinct in multilayers, with reduced penetration of certain drugs into inner cell layers, impacting overall drug activity.
- Multilayer cultures demonstrated greater resistance to anticancer drugs than monolayers, with differential responses that better reflected in vivo tumor behavior, as exemplified by gemcitabine's activity.
Conclusions:
- Multilayer postconfluent cell cultures represent a simple, three-dimensional in vitro system that effectively models microenvironmental effects on anticancer drug activity.
- This model shows promise for rigorous secondary in vitro screening, offering improved prediction of in vivo drug efficacy and aiding in the reduction of animal experimentation.
- The multilayer model facilitates studies on drug transport, pharmacodynamics, and combination therapies, providing valuable insights for novel drug development against solid tumors.