Factors Defining Human Adipose Stem/Stromal Cell Immunomodulation in Vitro

Area of Science:

• Immunology
• Stem Cell Biology
• Regenerative Medicine

Background:

• Human adipose tissue-derived stem/stromal cells (hASCs) are multipotent mesenchymal stem cells known for their immunomodulatory properties.
• Understanding the factors influencing hASC immunoregulatory functions is crucial for their therapeutic applications.

Purpose of the Study:

• To review and synthesize current knowledge on experimental and donor-related factors affecting hASC immunomodulatory functions in vitro.
• To highlight the variability and lack of standardization in current research methodologies.

Main Methods:

• Literature analysis of studies investigating hASC immunomodulatory capacities in vitro.
• Discussion of experimental determinants including cell interactions, culture conditions, and donor characteristics.

Main Results:

• Various experimental factors (e.g., cell ratio, oxygen tension, 2D vs. 3D culture, passage number) significantly impact hASC immunosuppressive potential.
• Donor-related factors (age, sex, health status) also influence hASC immunomodulation.
• Most determinants are studied in non-standardized ranges, leading to inconsistent and non-univocal results.

Conclusions:

• Significant variability exists in reported hASC immunomodulatory functions due to non-standardized experimental and donor factors.
• Clear conclusions for a standardized hASC immunopotency assay are difficult to draw.
• Further standardized research and expert consensus are needed to optimize hASC-based therapies.