Three-dimensional (3D) in vitro culture is now a recognized technique to improve the performance and physiological relevance of immortalized and primary cells. 3D culture also increases proliferation rates in some cell types (e.g. mesenchymal stem cells, osteosarcoma cells, HUVECs, which puts extra demands on nutrient supply and waste removal. This issue can be addressed by the use of bioreactors, which circulate a large quantity of medium over or around the 3D culture and further improve cell proliferation and specific protein expression beyond that seen for static 3D cultures (e.g. dermal fibroblasts, cardiac cells, marrow stromal cells, osteogenic cells.
In this post, we will explore two examples of how perfusion systems can help take your 3D cell culture one step further, based on two publications from REPROCELL’s Alvetex users in the field of developmental biology and cancer.
Left: Alvetex Perfusion Culture Plate uses a modified 6-well plate design well-known to lab scientists. Right: Pairing the Alvetex Perfusion Culture Plate with Alvetex well inserts combines the advantages of medium flow with 3D cell culture.
Alvetex Perfusion Cell Culture System improves conditioned medium activity in paracrine co-cultures
In a 2017 Bone Reports study , researchers from the University of Melbourne and from Boston University teamed up to investigate the crosstalk between bone and muscle, and more specifically the effect of osteocyte-conditioned medium on myogenic differentiation. MLO-Y4 osteocytes were cultured in Alvetex scaffold in either static or perfused conditions, using the Alvetex perfusion plate and well inserts, and the resulting conditioned medium was added to C2C12 myoblasts. Several cytokines relevant to muscle formation were detected in the conditioned medium, with differential amounts of individual cytokines between static and perfused medium generally supporting a greater inhibitory activity of perfused conditioned medium, as exemplified by a decrease in IL-1β, IL-3, IL-4, IL-10, MIG and MIP-1a in perfused culture conditioned medium compared to its static culture equivalent.
Alvetex Perfusion Cell Culture System maintains metabolic homeostasis during Cancer cell culture
In a separate project, scientists from the University of Oxford cultured the human pancreatic cancer cell line PSN-1 over a period 7 days, in either static or perfused conditions, using the Alvetex perfusion plate. Cell culture medium levels of glucose and secreted lactate were monitored as indicators of metabolic depletion and showed that perfusion culture reduces hypoglycaemic and anaerobic stress. Protein synthesis and cell proliferation were also preserved in perfused vs static culture, as suggested by increased expression of phosphorylated Ribosomal protein S6 and cyclin D1.
Interested in Pancreatic Cancer? Check out this recent Alvetex article on how CAFs and TGF-β Signaling Activation by Mast Cells Contribute to Resistance to Gemcitabine/Nabpaclitaxel in Pancreatic Cancer
Adding Perfusion to your 3D Cell Culture the Easy Way
If this is the kind of results you want to achieve with your in vitro cell models, then adding perfusion can be done with minimal disruption to your existing protocols. Alvetex Perfusion plates:
- Follow a modified 6-well plate design, so they are compatible not only with our Alvetex well inserts, but with most commercial 6-well inserts.
- Are fitted with standard luer locks, so they can be connected to whichever model of tubing and pump are most adapted to each user’s applications.
- Come with no previous cell-compatible coating, so they can be used for non-adherent culture or be coated with each user’s preferred ECM.
- Have 4 connected wells, allowing for greater volume provision for highly metabolic monocultures, or active solute flow for paracrine or cell migration co-cultures.
Left: Unidirectional flow through 4 interconnected wells within each Alvetex Perfusion plate. Right: Each well can support 2D or 3D culture, for a range of co-culture options.
Want to explore further?
Could perfusion reduce metabolic stress in your cultures and improve the functionality of your cells? Get in touch with one of our scientists to find out! We’re looking forward to learning more about your work and how our systems could help you take your research further.
Frederique Tholozan, Ph.D. Business Development Manager (EMEA), REPROCELL