Cell homing
Recruiting the patient's own cells into a scaffold instead of transplanting cells at all.
Cell homing inverts the usual approach. Instead of harvesting, expanding, and implanting cells, a scaffold loaded with chemotactic signals is placed and the patient's own cells are recruited into it. The cells never leave the body.
The regulatory and practical appeal is obvious: no cell culture, no manufacturing of a living product, no storage — the objections that make cell therapy expensive largely dissolve, as Translation in regenerative medicine notes. The approach depends entirely on signals: chemokines such as SDF-1 to recruit, plus factors like PDGF and BMPs to retain and instruct, which makes it a release-kinetics problem above all.
It is studied prominently in pulp regeneration, where the alternative — culturing autologous pulp cells — is impractical for routine care. Its limitation is that it depends on the patient having competent cells to recruit, which is least likely in the aged or diseased tissue that needs repair most. See The stem cell niche.
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