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Short answer
Tissue engineering is an interdisciplinary field that applies the principles of engineering and the life sciences to develop biological substitutes that restore, maintain or improve tissue function. In practice a project combines three variables: cells, a scaffold, and bioactive signals such as growth factors. This page is general reference, not medical advice.
What is tissue engineering? Definition and scope
The most-cited definition comes from Langer and Vacanti (Science 1993;260:920-6, DOI 10.1126/science.8493529): tissue engineering is “an interdisciplinary field of research that applies both the principles of engineering and the processes and phenomena of the life sciences toward the development of biological substitutes that restore, maintain, or improve tissue function.” In simple words, the goal is to grow or guide new functional tissue rather than only to replace a damaged part with an inert one.
That last point separates it from the classic biomaterials approach. A review in the Annals of Maxillofacial Surgery (2013, PMC3645600) describes tissue engineering as aiming to induce new functional tissues, rather than just to implant new replacement parts. Related terms such as regenerative medicine overlap with it; this page uses “tissue engineering” in the Langer-Vacanti sense.
The three components: cells, scaffold and signals
The same 2013 review frames the field as an equilateral triangle in which stem cells, resorbable scaffolds and bioactive molecules such as growth factors continuously interact. For anyone reading or reviewing a tissue-engineering protocol, these are the three variables to look for and document: where the cells came from, what the scaffold is made of, and which signals were applied.
How are stem cells used in tissue engineering?
Stem cells supply the cell population. The review notes that such cells may be considered pluripotent but can interact with growth factors so that they are stimulated to differentiate along certain cell lineages, and that contact with scaffold surfaces can also induce differentiation (it gives bone and cartilage as examples). For background on a common stem-cell source, see our guides to induced pluripotent stem cells and embryonic stem cells.
What does the scaffold do?
Per the same review, scaffolds enable three-dimensional growth of tissue in predetermined sizes and shapes, and resorbable scaffolds are one corner of the triad. For how mixed cell populations are grown together at the bench, see coculture.
Types of tissue engineering: cells, scaffold, or factors
An NSF history of the field’s emergence (nsf.gov/pubs/2004/nsf0450/emergence.htm) groups early approaches into three categories, which is a useful sorting aid when reading a paper:
- Cells alone.
- Cells and scaffold.
- Tissue-inducing factors.
Examples: FDA-listed products that use the approach
The FDA’s list of Approved Cellular and Gene Therapy Products (page read 2026-11-08) names several products whose listed descriptions show how cells and scaffolds are combined. The table reproduces only the descriptions as the FDA lists them.
| Product (FDA list) | Description as listed by FDA |
|---|---|
| MACI | Autologous cultured chondrocytes on a porcine collagen membrane |
| GINTUIT | Allogeneic cultured keratinocytes and fibroblasts in bovine collagen |
| STRATAGRAFT | Allogeneic cultured keratinocytes and dermal fibroblasts in murine collagen-dsat |
| SYMVESS | Acellular tissue engineered vessel-tyod |
Reading the table against the triad: the first three pair cultured cells with a collagen-based carrier, while SYMVESS is listed as acellular, so the FDA lists at least one tissue-engineered product as acellular. Autologous means the cells come from the same patient; allogeneic means from a donor. For the wider regulatory context for cellular products, see our guide to FDA approval of gene therapy.
Where it matters for labs and research teams
Because results depend on cell source, scaffold and signals together, methods sections that name all three are easier to reproduce and compare. Tissue engineering sits alongside cell biology and biotechnology as the wider disciplines it draws on.
Common misunderstandings
- It is not just implants. Classic biomaterial implants replace a part; tissue engineering aims to induce functional tissue.
- It does not require stem cells in every case. Stem cells are one corner of the triad, and the categories above include cells-alone and factor-only approaches.
- “Tissue engineered” does not mean cell-containing. SYMVESS is listed by the FDA as acellular.
FAQ
What exactly is tissue engineering?
An interdisciplinary field applying engineering and life-science principles to develop biological substitutes that restore, maintain or improve tissue function (Langer and Vacanti, 1993).
How are stem cells used in tissue engineering?
They provide a cell population that growth factors and scaffold contact can direct to differentiate along particular lineages, such as bone or cartilage.
Why is tissue engineering important?
Its stated aim is to restore, maintain or improve tissue function by inducing new functional tissue rather than only implanting replacement parts.
Sources
- Langer R, Vacanti JP. Tissue engineering. Science 1993;260:920-6. DOI 10.1126/science.8493529.
- Tissue engineering: Propagating the wave of change. Annals of Maxillofacial Surgery, 2013. PMC3645600 (read 2026-11-08).
- U.S. FDA, Approved Cellular and Gene Therapy Products (read 2026-11-08).
- National Science Foundation, emergence of tissue engineering (three-category grouping).
