Which stain demonstrates gliosis and astrocytic processes?

• A. Holzer
• B. Bodian
• C. Bielschowsky
• D. Cresyl echt Violet

Answer: (A)

Visualizing the reaction of glial cells, especially astrocytes, is best done with a stain that highlights glial elements rather than neuronal structures. Holzer stain is designed to emphasize glial fibers, including the processes of astrocytes. In areas where gliosis has occurred, astrocytes proliferate and extend their processes, creating a dense network that Holzer stain can reveal clearly. This makes the astrocytic response around injury or lesions stand out.

In contrast, Cresyl echt Violet (Nissl) primarily stains neuronal cell bodies and rough endoplasmic reticulum, which highlights neurons rather than the glial framework. Bielschowsky and Bodian are silver stains focused on axons, neurofibrils, and neuritic elements, useful for outlining neuronal processes and degeneration but not specifically for astrocytic networks. Thus these stains don’t illuminate gliosis as effectively as Holzer does.