Unveiling Interindividual Variability of Human Fibroblast Innate Immune Response Using Robust Cell-Based Protocols

Area of Science:

• Immunology
• Cell Biology
• Clinical Research

Background:

• The LabEx Milieu Interieur (MI) project characterized immune responses in 1,000 healthy donors.
• Understanding immunologic variance in healthy populations requires robust methods for analyzing cellular responses.
• Primary fibroblasts play a role in innate immunity and can reflect individual immune phenotypes.

Purpose of the Study:

• To develop and validate standardized in vitro methods for quantifying primary fibroblast responses.
• To assess inter-donor variability in innate immune responses using Toll-like receptor (TLR) pathways.
• To establish a framework for high-throughput screening of immune-phenotype characteristics in a clinical cohort.

Main Methods:

• Generated a bio-bank of primary fibroblast cell lines from 323 healthy individuals in the MI cohort.
• Established high-throughput automation-compatible methods for fibroblast activation using MAMPs analogs (poly I:C for TLR3, LPS for TLR4) and HSV-1.
• Utilized an 'Add-only' protocol and automated high-content imaging for standardized cell response quantification.

Main Results:

• In vitro stimulation of fibroblasts demonstrated measurable inter-donor variability in immune-phenotype.
• Standardized methods provided high biological signal fidelity with low system noise.
• The developed framework is compatible with high-throughput screening and automated analysis.

Conclusions:

• Standardized in vitro fibroblast response assays can effectively characterize individual immune-phenotype variability.
• The experimental framework supports the study of immune characteristics relevant to human clinical cohorts.
• This approach offers a foundation for future research into genetic and environmental determinants of immune variance.