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Association Areas of the Cortex

Association Areas of the Cortex

Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...

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A Practical Approach to Genetic Inducible Fate Mapping: A Visual Guide to Mark and Track Cells In Vivo

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GFAP expression in the BRAIN during human postnatal development.

Lauren Luijerink¹, Karen Waters², Michael Rodriguez³

¹Discipline of Medicine, Central Clinical School, The University of Sydney, NSW, 2006, Australia.

Neuropathology and Applied Neurobiology

|September 19, 2024

Summary

This summary is machine-generated.

Glial fibrillary acidic protein (GFAP) density decreases in specific infant brain regions during development. Reactive astrocytes are common, especially in early postnatal months, with variations linked to sudden infant death syndrome (SIDS) risk factors.

Keywords:

SIDS astrocytes astrogliosis development glia reactive

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Area of Science:

Neuroscience
Developmental Biology
Immunohistochemistry

Background:

Glial fibrillary acidic protein (GFAP) is a key marker for astrocytes.
Astrogliosis, indicated by GFAP reactivity, is crucial in brain development and injury.
Understanding GFAP expression in the infant brain is vital for developmental neuroscience.

Purpose of the Study:

To quantify GFAP expression and cell size in 26 brain regions of developing infants (40-83 weeks postconceptional age).
To investigate the impact of postconceptional age (PCA) on GFAP expression.
To explore differences in GFAP expression related to sudden infant death syndrome (SIDS) classification and risk factors.

Main Methods:

Utilized GFAP immunohistochemistry to measure GFAP-positive cell density (GFAP+/mm²) and an R-score for astrogliosis.
Analyzed 26 specific brain regions including the amygdala, basal ganglia, cerebellum, hippocampus, and medulla.
Correlated GFAP findings with postconceptional age and SIDS classification/risk factors.

Main Results:

The cerebellar internal granular layer showed the highest GFAP density, with over 60% of infants exhibiting pathological R-scores (>120).
GFAP expression decreased with increasing PCA in regions like the entorhinal cortex, temporal cortex, subiculum, cerebellum, and medulla.
GFAP cell soma size correlated with astrogliosis scores, independent of PCA; regional differences were observed based on SIDS classification and risk factors.

Conclusions:

GFAP density declines in specific infant brain regions during the first year of postnatal development.
Reactive astrocytes are prevalent in the developing brain, particularly in early postnatal months.
GFAP expression patterns vary regionally and may be influenced by SIDS classification and associated risk factors.