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Bustamante DJ, Basile EJ, Hildreth BM, Browning NW, Jensen SA, Moldovan L, Petrache HI, Moldovan NI. Biofabrication of spheroids fusion-based tumor models: computational simulation of glucose effects. Biofabrication 2021; 13. [PMID: 33498017 DOI: 10.1088/1758-5090/abe025] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 01/26/2021] [Indexed: 01/04/2023]
Abstract
In vitro tumor models consisting of cell spheroids are increasingly used for mechanistic studies and pharmacological testing. However, unless vascularized, the availability of nutrients such as glucose to deeper layers of multicellular aggregates is limited. In addition, recent developments in cells-only biofabrication (e.g. 'scaffold-free bioprinting'), allow the creation of more complex spheroid-based structures, further exposing the cells to nutrient deprivation within these constructs. To explore the impact of glucose availability on such tumor-like structures, we used the CompuCell3D (CC3D) platform for modeling of tumor spheroids. By monitoring the types of cells, fusing pairs geometry and the distance between spheroids centers of mass, we made novel heuristic observations on how binary- and multi-spheroid fusions are impacted by glucose availability. At limiting glucose concentrations mimicking hypoglycemia we noted an abrupt collapse of the tumor spheroids, unexpectedly amplified by the contact with normal cell spheroids. At higher glucose concentrations, we found an increased intermixing of cancerous cells, strong anti-phase oscillations between proliferating and quiescent tumor cells and a structural instability of fusing tumor spheroids, leading to their re-fragmentation. In a model of tumor microenvironment composed of normal cell spheroids fusing around a tumoral one, the competition for glucose lead to either the tumor's disappearance, or to its steady expansion. Moreover, the invasion of this microenvironment by individual tumor cells was also strongly depended on the available glucose. In conclusion, we demonstrate the value of computational simulations for anticipating the properties of biofabricated tumor models, and in generating testable hypotheses regarding the relationship between cancer, nutrition and diabetes.
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Affiliation(s)
- David J Bustamante
- IUPUI BME, 799 W. Michigan Street, Indianapolis, Indiana, 46202-5195, UNITED STATES
| | - Elijah J Basile
- IUPUI, 301 University Boulevard, Indianapolis, Indiana, 46202-5146, UNITED STATES
| | - Brady M Hildreth
- IUPUI, 301 University Boulevard, Indianapolis, Indiana, 46202-5146, UNITED STATES
| | - Nathan W Browning
- IUPUI, 301 University Boulevard, Indianapolis, Indiana, 46202-5146, UNITED STATES
| | - S Alexander Jensen
- IUPUI, 301 University Boulevard Suite, Indianapolis, Indiana, 46202-5146, UNITED STATES
| | - Leni Moldovan
- Surgery, Indiana University School of Medicine, 1481 W. 10th St., Room D-2008, Indianapolis, Indiana, 46202-5114, UNITED STATES
| | - Horia I Petrache
- Department of Physics, Indiana University - Purdue University at Indianapolis, 402 N. Blackford Street, LD 154, Indianapolis, Indiana, 46202, UNITED STATES
| | - Nicanor I Moldovan
- VA Medical Center, Indiana University Purdue University at Indianapolis, 1481 W. 10th St., Room C6128, Indianapolis, Indiana, 46202-5143, UNITED STATES
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Wu Y, Ayan B, Moncal KK, Kang Y, Dhawan A, Koduru SV, Ravnic DJ, Kamal F, Ozbolat IT. Hybrid Bioprinting of Zonally Stratified Human Articular Cartilage Using Scaffold-Free Tissue Strands as Building Blocks. Adv Healthc Mater 2020; 9:e2001657. [PMID: 33073548 PMCID: PMC7677219 DOI: 10.1002/adhm.202001657] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Indexed: 01/24/2023]
Abstract
The heterogeneous and anisotropic articular cartilage is generally studied as a layered structure of "zones" with unique composition and architecture, which is difficult to recapitulate using current approaches. A novel hybrid bioprinting strategy is presented here to generate zonally stratified cartilage. Scaffold-free tissue strands (TSs) are made of human adipose-derived stem cells (ADSCs) or predifferentiated ADSCs. Cartilage TSs with predifferentiated ADSCs exhibit improved mechanical properties and upregulated expression of cartilage-specific markers at both transcription and protein levels as compared to TSs with ADSCs being differentiated in the form of strands and TSs of nontransfected ADSCs. Using the novel hybrid approach integrating new aspiration-assisted and extrusion-based bioprinting techniques, the bioprinting of zonally stratified cartilage with vertically aligned TSs at the bottom zone and horizontally aligned TSs at the superficial zone is demonstrated, in which collagen fibers are aligned with designated orientation in each zone imitating the anatomical regions and matrix orientation of native articular cartilage. In addition, mechanical testing study reveals a compression modulus of ≈1.1 MPa, which is similar to that of human articular cartilage. The prominent findings highlight the potential of this novel bioprinting approach for building biologically, mechanically, and histologically relevant cartilage for tissue engineering purposes.
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Affiliation(s)
- Yang Wu
- Engineering Science and Mechanics Department, Penn State University, University Park, PA, 16802, USA
- The Huck Institutes of the Life Sciences, Penn State University, University Park, PA, 16802, USA
| | - Bugra Ayan
- Engineering Science and Mechanics Department, Penn State University, University Park, PA, 16802, USA
- The Huck Institutes of the Life Sciences, Penn State University, University Park, PA, 16802, USA
| | - Kazim K Moncal
- Engineering Science and Mechanics Department, Penn State University, University Park, PA, 16802, USA
- The Huck Institutes of the Life Sciences, Penn State University, University Park, PA, 16802, USA
| | - Youngnam Kang
- Engineering Science and Mechanics Department, Penn State University, University Park, PA, 16802, USA
- The Huck Institutes of the Life Sciences, Penn State University, University Park, PA, 16802, USA
| | - Aman Dhawan
- Department of Orthopaedics and Rehabilitation, Penn State College of Medicine, Milton S. Hershey Medical Center, Hershey, PA, 17033, USA
| | - Srinivas V Koduru
- Department of Surgery, Penn State Health Milton S. Hershey Medical Center, Hershey, PA, 17033, USA
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, PA, 17033, USA
| | - Dino J Ravnic
- Department of Surgery, Penn State Health Milton S. Hershey Medical Center, Hershey, PA, 17033, USA
| | - Fadia Kamal
- Center for Orthopedic Research and Translational Science, Department of Orthopedics and Rehabilitation, Penn State University, College of Medicine, Milton S. Hershey Medical Center, Hershey, PA, 17033, USA
- Department of Pharmacology, Penn State University, College of Medicine, Milton S. Hershey Medical Center, Hershey, PA, 17033, USA
| | - Ibrahim T Ozbolat
- Engineering Science and Mechanics Department, Penn State University, University Park, PA, 16802, USA
- The Huck Institutes of the Life Sciences, Penn State University, University Park, PA, 16802, USA
- Biomedical Engineering Department, Penn State University, University Park, PA, 16802, USA
- Materials Research Institute, Penn State University, University Park, PA, 16802, USA
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