Abstract
Prediction of in vivo drug-induced hepatotoxicity by in vitro cell culture systems is still one of the main challenges in drug development. To date, most in vitro approaches are based on monolayer cultures of primary hepatocytes, although it is known that they rapidly lose their morphology and liver-specific functions, such as activities of drug-metabolizing enzymes and transporters. Hepatocyte dedifferentiation can be delayed by culturing cells in a 3D environment. Combination with continuous medium flow, which creates a more physiological situation, further improves the maintenance of hepatic functions. Here, we present recently developed hydrogels and scaffolds for 3D culture of hepatocytes, which aim at preserving hepatic morphology and functionality for up to 4 weeks in culture. Furthermore, major benefits and drawbacks of microfluidic devices for in vitro hepatotoxicity screening are discussed. Although promising advances have been made regarding the preservation of hepatic functions in 3D flow culture, major issues, such as expensive equipment, large cell numbers and low throughput, are still hampering their use in drug toxicity screening. For these devices to be applied and accepted in the drug-developing industry, it is necessary to combine easily accessible matrices that highly preserve the activities of drug-metabolizing enzymes with a user-friendly microfluidic platform, thereby finding the right balance between reflecting the in vivo situation and enabling satisfying throughput for drug candidate screening.
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Abbreviations
- 3D:
-
Three-dimensional
- CYP:
-
Cytochrome P450 enzymes
- ECM:
-
Extracellular matrix
- PEG:
-
Polyethylene glycol
- PLA:
-
Polylactic acid
- PLGA:
-
Poly(lactic-co-glycolic)acid
- PVA:
-
Polyvinyl alcohol
- PS:
-
Polystyrene
- RGD:
-
Arginine-glycine-aspartate tripeptide
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Acknowledgements
The present work has been partially supported by BMBF-0316058A and the Set Foundation.
Compliance with ethical requirements and conflict of interest
In the studies with human subjects carried out by the authors that are mentioned in this review, all procedures met the ethical standards of the responsible committee on human experimentation and with the Helsinki Declaration of 1975, as revised in 2008. Informed consent was obtained from all patients for inclusion in the study. Britta Burkhardt, Juan José Martinez-Sanchez, Anastasia Bachmann, Ruth Ladurner and Andreas K. Nüssler declare that they have no conflicts of interest.
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Burkhardt, B., Martinez-Sanchez, J.J., Bachmann, A. et al. Long-term culture of primary hepatocytes: new matrices and microfluidic devices. Hepatol Int 8, 14–22 (2014). https://doi.org/10.1007/s12072-013-9487-3
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DOI: https://doi.org/10.1007/s12072-013-9487-3