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Subcellular Fractionation

Subcellular Fractionation

The homogenate obtained after cell lysis contains various membrane-bound organelles that can be further separated into pure fractions by subcellular fractionation. These isolates are used to study specific cellular components, analyze localized protein activity, and are even employed in diagnostics. Fractionation is typically achieved using centrifugation methods, the most common being density-gradient and differential centrifugation.
Differential Centrifugation
Differential centrifugation is...

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A High-throughput Cell Microarray Platform for Correlative Analysis of Cell Differentiation and Traction Forces

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Published on: March 1, 2017

Understanding the Foreign Body Response via Single-Cell Meta-Analysis.

Norah E Liang^1,2, Jennifer B Parker^1,3, John M Lu^1,3

¹Hagey Laboratory of Pediatric Regenerative Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA.

|July 26, 2024

Summary

Foreign body response (FBR) is a universal reaction to implants. This meta-analysis identifies common gene signatures in fibroblasts and macrophages, revealing potential therapeutic targets for improving implant longevity.

Keywords:

fibroblasts foreign body response macrophages meta-analysis scRNA-seq

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Area of Science:

Biomaterials Science
Immunology
Computational Biology

Background:

Foreign body response (FBR) universally impacts implanted biomaterials, affecting device performance and lifespan.
Existing single-cell RNA sequencing (scRNA-seq) studies on FBR lack generalizability due to individual study limitations.

Purpose of the Study:

To conduct a meta-analysis of available scRNA-seq data from mouse FBR studies.
To identify conserved gene signatures and cellular pathways involved in FBR across diverse models and anatomical sites.
To uncover potential therapeutic targets for mitigating FBR and enhancing implant success.

Main Methods:

Meta-analysis of scRNA-seq data from multiple FBR mouse studies.
Identification and characterization of fibroblast and macrophage subpopulations in response to foreign bodies.
Analysis of signaling pathways, gene ontology terms, and cell-cell interactions (using CellChat).

Main Results:

Identified distinct fibroblast subpopulations with enriched transforming growth factor-beta (TGF-β) signaling and pro-fibrotic gene expression.
Characterized macrophage subclusters exhibiting high expression of pro-fibrotic and pro-inflammatory mediators downstream of tumor necrosis factor (TNF) signaling.
Revealed significant fibroblast-macrophage signaling interactions crucial to the FBR.

Conclusions:

This meta-analysis provides a comprehensive view of FBR by integrating multiple datasets, identifying common cell-specific gene signatures.
The findings highlight specific fibroblast and macrophage pathways as key drivers of FBR.
Identified gene signatures offer promising therapeutic targets for improving the function and longevity of medical implants.