Self-organising bovine stem cells offer new route to structured cultivated steak
Researchers at EMBL Barcelona have coaxed bovine embryonic stem cells to self-organise into three-dimensional tissue containing muscle, nerve and blood vessel cells simultaneously – a development with implications for how the cultivated meat sector might one day manufacture whole-cut, steak-like products rather than minced formats.
Why this matters for food manufacturers
Reproducing the structure of a whole cut of meat, rather than mince, remains one of the principal technical barriers facing the cultivated meat sector. Current manufacturing routes typically depend on isolating muscle, vascular and other cell types separately and then assembling them using bioprinting, scaffolding or hydrogel-module stacking – approaches that add manufacturing steps and cost. A new study, published in Nature Communications by a team at the European Molecular Biology Laboratory (EMBL) Barcelona, proposes an alternative: inducing multiple tissue-relevant cell types from a single, indefinitely proliferative stem cell source that then self-organises without external assembly.
For process engineers and product developers in the cultivated meat space, the finding is significant less for its readiness for commercial deployment than for what it demonstrates about reducing manufacturing complexity. As the authors put it in their discussion, “the co-induction of bovine myocytes and endothelial cells without genetic modification as well as the subsequent formation of muscle fibres and endothelial networks within a single tissue represent a crucial step toward the production of structured beef steaks.”
From embryonic stem cells to muscle fibre
The research, led by Miki Ebisuya, former Group Leader at EMBL Barcelona and now Humboldt Professor at PoL-TU Dresden, used an established bovine embryonic stem cell (ESC) line rather than the adult-derived myosatellite cells or mesenchymal stem cells (MSCs) that dominate current cultivated beef production. The current approaches to cultivated beef typically rely on stem cells taken from adult cows, and while these cells can produce muscle, they have limited capacity to divide and are already committed to becoming only certain types of tissue, making it difficult to recreate the diversity of cell types found in real meat.
Embryonic stem cells, by contrast, retain broader developmental potential. The authors note in their abstract that their “serum-free, rapid co-induction protocols represent a milestone toward self-organizing beef steaks with integrated vasculature and innervation.”
The protocol follows the stages of embryonic development. Bovine stem cells were first treated with a combination of growth factors and signalling molecules to steer them towards presomitic mesoderm PSM), an early tissue type that gives rise to muscle, within two days. These cells were then treated with a further set of growth factors to drive them towards becoming muscle cells. Muscle fibres with sarcomeres – the repeating units that give muscle its contractile structure – appeared within 15 days, with a sarcomere length similar to that seen in muscle in living cattle.
Innervation and vascularisation without separate assembly
A distinguishing feature of the work is the co-induction, from the same PSM population, of neurons and endothelial cells alongside the myogenic lineage. Muscle fibres displayed spontaneous calcium oscillations that were suppressed by curare, an acetylcholine receptor blocker, indicating early neuromuscular-junction-like connectivity between co-induced neurons and myocytes. Staining with α-bungarotoxin revealed punctate signals located predominantly at sites where muscle fibres and neurons were in close proximity.
For vascularisation, PSM cells were treated with the angiogenic factors VEGF and forskolin alongside the muscle-inducing cocktail. VE-cadherin-positive endothelial cells emerged from day eight and formed interconnected vessel-like networks that increased in segment number and branching density through to day 15. The authors report that skeletal muscle domains encased by endothelial cells measured 200–300 µm in diameter by day 15, which they note “surpassed the intercapillary distance of approximately 100 µm in tissues, yet remained within a comparable range.”
Scaling into three dimensions
The team then extended the protocol to three-dimensional aggregates of 20,000 PSM cells, cultured on a rotary shaker with 2% Matrigel for structural support. These aggregates, roughly 600 µm in diameter, developed muscle domains alongside neural and vascular networks, with single-cell RNA sequencing confirming the presence of distinct muscle, neural and endothelial clusters. Three-dimensional cultures yielded a higher proportion of skeletal muscle relative to smooth muscle than two-dimensional cultures, a distinction the authors flag as relevant to product suitability, noting the “skeletal muscle-rich 3D cultures are more suitable for cultured beef applications than the 2D cultures.”
Commenting on the significance
Marina Sanaki-Matsumiya, former postdoctoral fellow in the Ebisuya Group and now Assistant Professor at the University of Tsukuba, framed the approach as a departure from conventional assembly-based manufacturing: “Instead of growing each cell type separately and assembling them afterwards, we showed that embryonic stem cells can develop together and self-organise, mimicking real tissue development.”
Professor Ebisuya was clear that the work represents an early stage rather than a production-ready process: “The tissue we generated is still very small. To produce something resembling a steak, we will need much larger tissues with more mature blood vessel networks that can support continued growth.”
Cost and scale-up barriers remain
The authors are explicit about the economic constraints on translation. A 0.1 mm³ muscle aggregate derived from 20,000 bovine ESCs currently costs between 0.39 and 0.99 EUR, with growth factors, chemical inhibitors and Matrigel accounting for the bulk of expense. Matrigel itself, being derived from mouse carcinoma cells, would need replacing with an animal-free alternative before any food-grade application.
Further limitations acknowledged in the paper include the use of a single bovine ESC line, meaning reproducibility across independent bovine pluripotent stem cell sources has yet to be established, and the absence of functional intraluminal perfusion within the engineered vessel networks – a step the authors identify as necessary before the vasculature could support larger, thicker tissues.
Outlook for tissue engineering applications
Beyond food applications, the authors position their platform as a tool for studying muscle development more broadly, noting that the multi-lineage system could help investigate “muscle development and tissue engineering in ways that are difficult to achieve with simpler cell cultures.” They also suggest their co-induced cell populations could complement, rather than replace, existing bioengineering methods, proposing that muscle aggregates featuring endothelial networks might serve as building blocks for bioprinting or larger-scale tissue assembly in future cultivated meat manufacturing pipelines.
Journal reference
Sanaki-Matsumiya, M., Sanaki, Y., Villava, C., et al. (2026). Self-organization of vascularized muscle from bovine embryonic stem cells. Nature Communications, 17, 8975. https://doi.org/10.1038/s41467-026-76569-2
