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Busek M, Aizenshtadt A, Koch T, Frank A, Delon L, Martinez MA, Golovin A, Dumas C, Stokowiec J, Gruenzner S, Melum E, Krauss S. Pump-less, recirculating organ-on-a-chip (rOoC) platform. LAB ON A CHIP 2023; 23:591-608. [PMID: 36655405 DOI: 10.1039/d2lc00919f] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
We developed a novel, pump-less directional flow recirculating organ-on-a-chip (rOoC) platform that creates controlled unidirectional gravity-driven flow by a combination of a 3D-tilting system and an optimized microfluidic layout. The rOoC platform was assembled utilizing a layer-to-layer fabrication technology based on thermoplastic materials. It features two organoid compartments supported by two independent perfusion channels and separated by a hydrogel barrier. We developed a computational model to predict wall shear stress values and then measured the flow rate in the microfluidic channels with micro-Particle-Image-Velocimetry (μPIV). The suitability of the rOoC for functional culture of endothelial cells was tested using HUVECs seeded in the perfusion channels. HUVECs aligned in response to the directional flow, formed a barrier and were able to sprout into the organoid compartments. Next, we demonstrated the viability of human stem-cell derived liver organoids in the organoid compartments. Finally, we show the possibility to circulate immune cells in the microfluidic channels that retain viability without being trapped or activated. The rOoC platform allows growing and connecting of two or more tissue or organ representations on-chip with the possibility of applying gradients, endothelial barriers, microvasculature and circulating cells independent of external tubing and support systems.
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Affiliation(s)
- Mathias Busek
- Hybrid Technology Hub - Centre of Excellence, Institute of Basic Medical Science, University of Oslo, P.O. Box 1110, 0317 Oslo, Norway
- Dep. of Immunology and Transfusion Medicine, Oslo University Hospital, P.O. Box 4950, 0424 Oslo, Norway.
| | - Aleksandra Aizenshtadt
- Hybrid Technology Hub - Centre of Excellence, Institute of Basic Medical Science, University of Oslo, P.O. Box 1110, 0317 Oslo, Norway
| | - Timo Koch
- Dep. of Mathematics, University of Oslo, P.O. Box 1083, 0316 Oslo, Norway
| | - Anna Frank
- Hybrid Technology Hub - Centre of Excellence, Institute of Basic Medical Science, University of Oslo, P.O. Box 1110, 0317 Oslo, Norway
- Norwegian PSC Research Center, Division of Surgery, Inflammatory Diseases and Transplantation, Oslo University Hospital, Oslo, Norway
- Research Institute of Internal Medicine, Division of Surgery, Inflammatory Diseases and Transplantation, Oslo University Hospital, Oslo, Norway
| | - Ludivine Delon
- Dep. of Immunology and Transfusion Medicine, Oslo University Hospital, P.O. Box 4950, 0424 Oslo, Norway.
| | - Mikel Amirola Martinez
- Hybrid Technology Hub - Centre of Excellence, Institute of Basic Medical Science, University of Oslo, P.O. Box 1110, 0317 Oslo, Norway
| | - Alexey Golovin
- Dep. of Immunology and Transfusion Medicine, Oslo University Hospital, P.O. Box 4950, 0424 Oslo, Norway.
| | - Clotilde Dumas
- Hybrid Technology Hub - Centre of Excellence, Institute of Basic Medical Science, University of Oslo, P.O. Box 1110, 0317 Oslo, Norway
| | - Justyna Stokowiec
- Hybrid Technology Hub - Centre of Excellence, Institute of Basic Medical Science, University of Oslo, P.O. Box 1110, 0317 Oslo, Norway
| | - Stefan Gruenzner
- Chair of Microsystems, Technische Universität Dresden, 01069 Dresden, Germany
| | - Espen Melum
- Hybrid Technology Hub - Centre of Excellence, Institute of Basic Medical Science, University of Oslo, P.O. Box 1110, 0317 Oslo, Norway
- Norwegian PSC Research Center, Division of Surgery, Inflammatory Diseases and Transplantation, Oslo University Hospital, Oslo, Norway
- Research Institute of Internal Medicine, Division of Surgery, Inflammatory Diseases and Transplantation, Oslo University Hospital, Oslo, Norway
- Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, P.O. Box 1110, 0317 Oslo, Norway
- Section of Gastroenterology, Department of Transplantation Medicine, Division of Surgery, Inflammatory Diseases and Transplantation, Oslo University Hospital, Oslo, Norway
| | - Stefan Krauss
- Hybrid Technology Hub - Centre of Excellence, Institute of Basic Medical Science, University of Oslo, P.O. Box 1110, 0317 Oslo, Norway
- Dep. of Immunology and Transfusion Medicine, Oslo University Hospital, P.O. Box 4950, 0424 Oslo, Norway.
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Tse HM, Gardner G, Dominguez-Bendala J, Fraker CA. The Importance of Proper Oxygenation in 3D Culture. Front Bioeng Biotechnol 2021; 9:634403. [PMID: 33859979 PMCID: PMC8042214 DOI: 10.3389/fbioe.2021.634403] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Accepted: 03/09/2021] [Indexed: 12/15/2022] Open
Abstract
Cell culture typically employs inexpensive, disposable plasticware, and standard humidified CO2/room air incubators (5% CO2, ∼20% oxygen). These methods have historically proven adequate for the maintenance of viability, function, and proliferation of many cell types, but with broad variation in culture practices. With technological advances it is becoming increasingly clear that cell culture is not a “one size fits all” procedure. Recently, there is a shift toward comprehension of the individual physiological niches of cultured cells. As scale-up production of single cell and 3D aggregates for therapeutic applications has expanded, researchers have focused on understanding the role of many environmental metabolites/forces on cell function and viability. Oxygen, due to its role in cell processes and the requirement for adequate supply to maintain critical energy generation, is one such metabolite gaining increased focus. With the advent of improved sensing technologies and computational predictive modeling, it is becoming evident that parameters such as cell seeding density, culture media height, cellular oxygen consumption rate, and aggregate dimensions should be considered for experimental reproducibility. In this review, we will examine the role of oxygen in 3D cell culture with particular emphasis on primary islets of Langerhans and stem cell-derived insulin-producing SC-β cells, both known for their high metabolic demands. We will implement finite element modeling (FEM) to simulate historical and current culture methods in referenced manuscripts and innovations focusing on oxygen distribution. Our group and others have shown that oxygen plays a key role in proliferation, differentiation, and function of these 3D aggregates. Their culture in plastic consistently results in core regions of hypoxia/anoxia exacerbated by increased media height, aggregate dimensions, and oxygen consumption rates. Static gas permeable systems ameliorate this problem. The use of rotational culture and other dynamic culture systems also have advantages in terms of oxygen supply but come with the caveat that these endocrine aggregates are also exquisitely sensitive to mechanical perturbation. As recent work demonstrates, there is a strong rationale for the use of alternate in vitro systems to maintain physio-normal environments for cell growth and function for better phenotypic approximation of in vivo counterparts.
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Affiliation(s)
- Hubert M Tse
- Department of Microbiology, The University of Alabama at Birmingham, Birmingham, AL, United States
| | - Graeme Gardner
- Department of Surgery, Diabetes Research Institute, Leonard M. Miller School of Medicine, University of Miami, Coral Gables, FL, United States
| | - Juan Dominguez-Bendala
- Department of Surgery, Diabetes Research Institute, Leonard M. Miller School of Medicine, University of Miami, Coral Gables, FL, United States.,Department of Cell Biology and Anatomy, University of Miami Miller School of Medicine, Miami, FL, United States
| | - Christopher A Fraker
- Department of Surgery, Diabetes Research Institute, Leonard M. Miller School of Medicine, University of Miami, Coral Gables, FL, United States
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Abstract
Defined by its potential for self-renewal, differentiation and tumorigenicity, cancer stem cells (CSCs) are considered responsible for drug resistance and relapse. To understand the behavior of CSC, the effects of the microenvironment in each tissue are a matter of great concerns for scientists in cancer biology. However, there are many complicated obstacles in the mimicking the microenvironment of CSCs even with current advanced technology. In this context, novel biomaterials have widely been assessed as in vitro platforms for their ability to mimic cancer microenvironment. These efforts should be successful to identify and characterize various CSCs specific in each type of cancer. Therefore, extracellular matrix scaffolds made of biomaterial will modulate the interactions and facilitate the investigation of CSC associated with biological phenomena simplifying the complexity of the microenvironment. In this review, we summarize latest advances in biomaterial scaffolds, which are exploited to mimic CSC microenvironment, and their chemical and biological requirements with discussion. The discussion includes the possible effects on both cells in tumors and microenvironment to propose what the critical factors are in controlling the CSC microenvironment focusing the future investigation. Our insights on their availability in drug screening will also follow the discussion.
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Lama S, Merlin-Zhang O, Yang C. In Vitro and In Vivo Models for Evaluating the Oral Toxicity of Nanomedicines. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E2177. [PMID: 33142878 PMCID: PMC7694082 DOI: 10.3390/nano10112177] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/03/2020] [Revised: 10/29/2020] [Accepted: 10/29/2020] [Indexed: 02/07/2023]
Abstract
Toxicity studies for conventional oral drug formulations are standardized and well documented, as required by the guidelines of administrative agencies such as the US Food & Drug Administration (FDA), the European Medicines Agency (EMA) or European Medicines Evaluation Agency (EMEA), and the Japanese Pharmaceuticals and Medical Devices Agency (PMDA). Researchers tend to extrapolate these standardized protocols to evaluate nanoformulations (NFs) because standard nanotoxicity protocols are still lacking in nonclinical studies for testing orally delivered NFs. However, such strategies have generated many inconsistent results because they do not account for the specific physicochemical properties of nanomedicines. Due to their tiny size, accumulated surface charge and tension, sizeable surface-area-to-volume ratio, and high chemical/structural complexity, orally delivered NFs may generate severe topical toxicities to the gastrointestinal tract and metabolic organs, including the liver and kidney. Such toxicities involve immune responses that reflect different mechanisms than those triggered by conventional formulations. Herein, we briefly analyze the potential oral toxicity mechanisms of NFs and describe recently reported in vitro and in vivo models that attempt to address the specific oral toxicity of nanomedicines. We also discuss approaches that may be used to develop nontoxic NFs for oral drug delivery.
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Affiliation(s)
| | | | - Chunhua Yang
- Center for Diagnostics and Therapeutics, Digestive Disease Research Group, Institute for Biomedical Sciences, Petite Science Center, Suite 754, 100 Piedmont Ave SE, Georgia State University, Atlanta, GA 30303, USA; (S.L.); (O.M.-Z.)
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