Mesenchymal stem cells
The most widely studied cells in regenerative medicine — and a reassessment of what they actually do.
Mesenchymal stem cells (MSCs) are multipotent cells isolatable from bone marrow, adipose tissue, dental pulp, and elsewhere. They can differentiate into bone, cartilage, and fat lineages, and they expand in culture — a combination that made them the default cell type across the field, including for osteoblast production in bone engineering.
The interesting development is a reassessment of mechanism. Early expectation was that transplanted MSCs would engraft and become new tissue. Tracking studies consistently show most disappear within days. Yet benefit is still observed — so attention has shifted to what they secrete: immunomodulatory and trophic factors that alter the host response. See Exosomes and the secretome and Immunomodulation in regeneration.
"MSC" also covers a genuinely heterogeneous set of populations. Cells from marrow, fat, and dental pulp differ in behaviour, and donor age and culture history change them further — a major reason results vary between laboratories, as Reproducibility in biomedical research discusses.
Related articles
- CellsStem cell differentiationHow an uncommitted cell chooses a fate — under chemical, mechanical, and spatial instruction.
- CellsExosomes and the secretomeCell-free therapy: using what stem cells secrete rather than the cells themselves.
- DentalDental pulp stem cellsMultipotent cells recoverable from the soft tissue inside a tooth — and a surprisingly accessible source for regeneration research.
- CellsThe stem cell nicheStem cells are defined as much by where they sit as by what they are.
- FoundationsImmunomodulation in regenerationThe immune system is not an obstacle to healing — its early behaviour largely determines whether tissue scars or rebuilds.
- CellsInduced pluripotent stem cellsReprogramming an adult cell back to a pluripotent state — and why it changed the field's constraints.