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Updated: Jul 1, 2026

The Hypoxic Ischemic Encephalopathy Model of Perinatal Ischemia

The Hypoxic Ischemic Encephalopathy Model of Perinatal Ischemia

Published on: November 19, 2008

ARG1 Inhibition after Neonatal Hypoxic-Ischemic Brain Injury.

Eesha Natarajan¹, Jeffrey R Fineman^2,3, Donna M Ferriero^2,4

¹Department of Pediatrics, University of California San Francisco, San Francisco, California, USA, eesha.natarajan@ucsf.edu.

Developmental Neuroscience

|February 26, 2026

Summary

This summary is machine-generated.

Arginase-1 (ARG1) expressing microglia are crucial for neonatal brain injury repair by clearing debris and remodeling tissue. Inhibiting ARG1 worsens injury, highlighting its protective role and therapeutic potential.

Keywords:

Arginase Brain Hypoxic-ischemic injury Microglia Neonatal mice

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Early Pathological and Magnetic Resonance Detection of Cerebral Injury Using a Rat Model of Neonatal Hypoxic Ischemic Encephalopathy

Early Pathological and Magnetic Resonance Detection of Cerebral Injury Using a Rat Model of Neonatal Hypoxic Ischemic Encephalopathy

Published on: October 28, 2022

Area of Science:

Neuroscience
Immunology
Developmental Biology

Background:

Neonatal hypoxic-ischemic (HI) brain injury causes significant mortality and disability.
Effective neuroprotective strategies are limited.
Microglia, particularly arginase-1 (ARG1) expressing cells, play key roles in HI injury and repair, but their function in tissue remodeling is unclear.

Purpose of the Study:

To investigate the role of ARG1⁺ microglia in neonatal HI brain injury.
To determine the impact of ARG1 inhibition on microglial function and brain repair.

Main Methods:

Neonatal mice underwent HI (Vannucci procedure).
Pharmacological inhibition of ARG1 activity using Nor-NOHA.
Assessment of ARG1 expression, microglial morphology, efferocytosis, scar formation, and injury volume via immunohistochemistry, Western blotting, and enzyme assays.

Main Results:

ARG1⁺ microglia demonstrated phagocytic activity towards apoptotic neurons.
ARG1 inhibition impaired microglial efferocytosis and increased brain injury volume.
ARG1⁺ microglia were involved in extracellular matrix (ECM) deposition, indicated by co-localization with collagen I alpha 1 (Col1a1).
Inhibition of ARG1 reduced Col1a1 expression, impacting tissue remodeling.

Conclusions:

ARG1⁺ microglia are essential for neonatal HI brain injury repair, mediating efferocytosis and ECM remodeling.
Pharmacological inhibition of ARG1 exacerbates HI brain injury, confirming its reparative function.
ARG1 is a critical regulator of microglial neuroprotection and a potential therapeutic target for neonatal HI brain injury.