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Updated: May 5, 2026

A Preclinical Controlled Cortical Impact Model for Traumatic Hemorrhage Contusion and Neuroinflammation
Published on: June 10, 2020
Inflammation in intracerebral hemorrhage: from mechanisms to clinical translation
Yu Zhou1, Yanchun Wang1, Jian Wang2
1Department of Neurology, Xinqiao Hospital & The Second Affiliated Hospital, The Third Military Medical University, Chongqing, China.
Insights
Intracerebral hemorrhage (ICH) causes significant brain injury through inflammation. Targeting inflammation and hematoma removal offers potential new treatments for this stroke type.
Area of Science:
- Neuroscience
- Immunology
- Pathology
Background:
- Intracerebral hemorrhage (ICH) is a severe stroke type with high mortality and no effective treatments.
- Inflammation significantly contributes to secondary brain injury following ICH.
- Current research focuses on understanding inflammatory mechanisms to develop novel therapies.
Purpose of the Study:
- To review recent advancements in understanding ICH-induced inflammation.
- To highlight key inflammatory pathways, including microglial activation and toll-like receptor (TLR) signaling.
- To explore potential therapeutic strategies targeting inflammation.
Main Methods:
- Review of preclinical studies on ICH pathogenesis and inflammation.
- Analysis of inflammatory signaling pathways triggered by hematoma components.
- Examination of therapeutic targets for inhibiting inflammatory responses.
Main Results:
- Hematoma components, including hemoglobin, heme, and iron, activate microglia and initiate inflammatory cascades.
- Danger-associated molecular patterns (DAMPs) like HMGB1 contribute to late-stage inflammation.
- Specific inflammatory pathways (microglial activation, TLR signaling) are identified as crucial in ICH.
Conclusions:
- Inflammation is a critical factor in secondary brain injury after ICH.
- Targeting hematoma component removal and TLR signaling inhibition presents promising therapeutic avenues.
- Further research into these pathways could lead to improved functional outcomes for ICH patients.
Abstract:
Intracerebral hemorrhage (ICH) accounts for 10-15% of all strokes and is associated with high mortality and morbidity. Currently, no effective medical treatment is available to improve functional outcomes in patients with ICH. Potential therapies targeting secondary brain injury are arousing a great deal of interest in translational studies. Increasing evidence has shown that inflammation is the key contributor of ICH-induced secondary brain injury. Inflammation progresses in response to various stimuli produced after ICH. Hematoma components initiate inflammatory signaling via activation of microglia, subsequently releasing proinflammatory cytokines and chemokines to attract peripheral inflammatory infiltration. Hemoglobin (Hb), heme, and iron released after red blood cell lysis aggravate ICH-induced inflammatory injury. Danger associated molecular patterns such as high mobility group box 1 protein, released from damaged or dead cells, trigger inflammation in the late stage of ICH. Preclinical studies have identified inflammatory signaling pathways that are involved in microglial activation, leukocyte infiltration, toll-like receptor (TLR) activation, and danger associated molecular pattern regulation in ICH. Recent advances in understanding the pathogenesis of ICH-induced inflammatory injury have facilitated the identification of several novel therapeutic targets for the treatment of ICH. This review summarizes recent progress concerning the mechanisms underlying ICH-induced inflammation. We focus on the inflammatory signaling pathways involved in microglial activation and TLR signaling, and explore potential therapeutic interventions by targeting the removal of hematoma components and inhibition of TLR signaling.
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