Scientists have developed a 3-D printing method capable of producing highly uniform ‘blocks’ of embryonic stem cells.
These cells – capable of generating all cell types in the body – could be used as the ‘Lego bricks’ to build tissue constructs, larger structures of tissues, and potentially even micro-organs.
The results are published today, Wednesday 4th November, in the journal Biofabrication.
“It was really exciting to see that we could grow embryoid body in such a controlled manner”, explains Wei Sun, a lead author on the paper. “The grown embryoid body is uniform and homogenous, and serves as a much better starting point for further tissue growth.”
The researchers, based at Tsinghua University, Beijing, China, and Drexel University, Philadelphia, USA, used extrusion-based 3-D printing to produce a grid-like 3-D structure to grow embryoid body that demonstrated cell viability and rapid self-renewal for 7 days while maintaining high pluripotentcy.
“Two other common methods of printing these cells are either two-dimensional (in a petri dish) or via the ‘suspension’ method (where a ‘stalagmite’ of cells is built up by material being dropped via gravity.)” continues Wei Sun. “However, these don’t show the same cell uniformity and homogenous proliferation.”
“I think that we’ve produced a 3-D microenvironment which is much more like that found in vivo for growing embryoid body, which explains the higher levels of cell proliferation.”
The researchers hope that this technique can be developed to produce embryoid body at a high throughput, providing the basic building blocks for other researchers to perform experiments on tissue regeneration and/or for drug screening studies.
Read more: 3-D printed ‘building blocks’ of life
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