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Chronic Inflammation: Introduction01:12

Chronic Inflammation: Introduction

Chronic inflammation is a prolonged, dysregulated immune response that persists for weeks to years when the inciting stimulus is difficult to eradicate or when self‑antigens drive ongoing reactivity. Morphologically, it is defined by mononuclear cell infiltration, progressive tissue destruction, and concurrent attempts at healing via angiogenesis and fibrosis. Compared with acute inflammation, edema is less prominent while cellular infiltration predominates; triggers include persistent...

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Related Experiment Video

Updated: May 10, 2026

Investigation of Macrophage Polarization Using Bone Marrow Derived Macrophages
10:07

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Reprogramming Macrophages toward Pro-inflammatory Polarization by Peptide Hydrogel.

Nan Kong1, Dinghao Chen1, Juan Liang1

  • 1Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province, Department of Chemistry, School of Science, Westlake University, No. 600 Dunyu Road, Hangzhou 310024, Zhejiang Province, China.

Biomacromolecules
|August 19, 2024
PubMed
Summary

This study introduces a peptide hydrogel that effectively converts tumor-associated M2 macrophages into pro-inflammatory M1 macrophages. This macrophage reprogramming strategy shows potential for enhancing cancer immunotherapy by altering the tumor microenvironment.

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Area of Science:

  • Biomaterials Science
  • Immunology
  • Cancer Research

Background:

  • Macrophages are key immune cells with context-dependent functions.
  • Tumor-associated macrophages (M2-like) often hinder anti-tumor immunity.
  • Reprogramming these macrophages presents a therapeutic challenge.

Purpose of the Study:

  • To develop a peptide hydrogel for macrophage polarization.
  • To investigate the hydrogel's ability to convert M0 and M2 macrophages to M1-like phenotypes.
  • To explore the potential of this strategy in cancer immunotherapy.

Main Methods:

  • Self-assembly of a peptide hydrogel from a short peptide.
  • Inclusion of an innate defense regulator peptide and a self-assembly motif.
  • Multivalent engagement of macrophage membrane receptors.

Main Results:

  • The peptide hydrogel successfully polarizes M0 macrophages into M1 macrophages via NF-κB activation.
  • The hydrogel repolarizes M2 macrophages into M1-like macrophages by activating CD206 receptors.
  • Densely arrayed regulators on the nanofibrous hydrogel enhance receptor engagement.

Conclusions:

  • This peptide hydrogel offers a novel approach for macrophage reprogramming.
  • The system effectively converts both M0 and M2 macrophages to a pro-inflammatory M1-like state.
  • This strategy holds promise for improving cancer immunotherapy by remodeling the tumor microenvironment.