Implantation of human mesenchymal stromal cell pellet for therapeutic angiogenesis.

Early human evidence such as case series or small samples is exploring possible benefits.

• Level A · Stronger Clinical Evidence
• Level B · Emerging clinical evidence with positive signals
• Level C · Early human research exploring benefits
• Level D · Scientific groundwork from lab and animal studies
• Emerging · Emerging topic under active research

Abstract (original English)

Background aims Although mesenchymal stromal cell (MSC) therapy holds great potential, therapeutic efficacy, which is predicted by pre-clinical studies, has fallen short of expectations in most clinical studies. This discrepancy may arise from inadequate standardization of cell preparations, unstable cell engraftment and insufficient understanding of cellular fitness in vivo due to the lack of a relevant experimental system in which human MSCs stably engraft and the behavior of the MSCs can be systemically analyzed. MSCs stimulate angiogenesis and accelerate tissue/organ regeneration by releasing various bioactive factors (secretome). In this study, we established a system in which an implanted human MSC pellet stably engrafts and the angiogenic ability of the MSCs can be systematically analyzed in vivo. Methods Surgically excised human subcutaneous white adipose tissue (4 g) was enzymatically digested and MSCs were successfully isolated from 237 patients (19-91 years old). MSCs isolated from donors (13 clones) less than 65 years old were used for the experiments. Results MSCs stimulated sprouting of human adipose endothelial cells in endothelial cell-organoids in vitro. Various angiogenesis-related factors were detected in cell lysate and conditioned medium from cultured non-frozen human MSCs in vitro. Within 21 days after initial cell isolation, an implantable MSC pellet was

Evidence level

Early human evidence such as case series or small samples is exploring possible benefits.

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