Related Experiment Video
Updated: Jun 30, 2026
09:12
Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
Published on: January 30, 2014
16.6K
Fluid-Niche and Microglial Signatures Prime Robust Intraventricular Macrophage Response to Blood During Brain
Biorxiv : the Preprint Server for Biology
|November 19, 2025
Summary
Intraventricular macrophages (IVMs) are the brain's first responders to blood in ventricles, clearing red blood cells. These dynamic cells have unique profiles, offering therapeutic potential for brain injury recovery.
Area of Science:
- Neuroimmunology
- Developmental Neuroscience
- Macrophage Biology
Background:
- Intraventricular macrophages (IVMs) are brain border-associated macrophages (BAMs) in cerebrospinal fluid (CSF).
- Their roles in development and injury response, particularly in neonatal intraventricular hemorrhage (IVH), are unclear.
- Understanding IVMs is crucial for addressing IVH sequelae like cerebral palsy and hydrocephalus.
Purpose of the Study:
- To investigate the developmental roles and injury responses of IVMs.
- To characterize IVM behavior and transcriptional profiles in the context of intraventricular hemorrhage.
- To explore the therapeutic potential of IVMs.
Main Methods:
- Live imaging of developing mouse ventricles and choroid plexus.
- Transcriptional profiling of IVMs.
- Analysis of macrophage responses to blood in the CSF.
Main Results:
- IVMs act as first responders to blood in developing brain ventricles, phagocytosing red blood cells.
- IVMs upregulate iron-processing machinery upon encountering blood.
- Live imaging revealed dynamic and morphologically distinct IVMs compared to other brain macrophages.
- Transcriptional profiles show IVMs differ from other BAMs, sharing features with youth-associated microglia and cavity macrophages.
Conclusions:
- IVMs are dynamic, specialized macrophages crucial for responding to intraventricular blood challenges.
- Their unique characteristics offer insights into brain development and injury repair.
- IVMs represent a potential therapeutic target for conditions like neonatal IVH.
More Related Videos
Related Concept Videos
00:49The Blood-brain Barrier
Overview
01:29Blood Flow
Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
01:07Development of Blood Vessels
The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...
01:14Fetal Circulation
Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
01:22Gut-Brain Axis
The gut–brain axis is a bidirectional communication system that connects the gastrointestinal tract and the brain. This interaction is mediated through multiple pathways, including the vagus nerve, hormonal signals, immune responses, and chemical messengers produced by gut microbes.Microbial Contributions to Brain FunctionGut microbiota contributes significantly to brain function by producing neuroactive compounds. These include neuroactive compounds that influence neurotransmitters such as...