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Astrocyte membrane structure: changes after circulatory arrest

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The Journal of Cell Biology

|March 1, 1981

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Astrocytic assemblies, unique particle arrays in brain membranes, are highly sensitive to tissue processing and metabolic conditions. These structures rapidly degrade after death or under low oxygen, highlighting their labile nature.

Area of Science:

Neuroscience
Cell Biology
Biochemistry

Background:

Astrocytic processes ensheath brain blood vessels and surfaces.
Freeze-fracture electron microscopy reveals particle arrays, termed "assemblies," in these membranes.

Purpose of the Study:

To investigate the structural stability and lability of astrocytic assemblies.
To determine factors influencing the integrity of these membrane specializations.

Main Methods:

Freeze-fracture electron microscopy of brain tissue.
Varied post-mortem intervals before rapid freezing.
In vitro cerebellar slice experiments under controlled oxygen and metabolic conditions.

Main Results:

Astrocytic assemblies exhibit orthogonal particle arrays.

Related Experiment Videos

Assembly structure is preserved with rapid freezing but degrades with delayed freezing.

Assemblies disappear at low PO2 or with dinitrophenol treatment in vitro.

No other neuronal or glial membrane specialization shows similar lability.

Conclusions:

Astrocytic assemblies are highly labile structures.
Their integrity is dependent on immediate tissue viability and aerobic metabolism.
These findings suggest a unique functional or structural role for assemblies sensitive to cellular energy status.