Russell bodies: a light and electron microscopic immunoperoxidase study

Area of Science:

• Cell Biology
• Immunology
• Pathology

Background:

• Russell bodies are intracellular inclusions traditionally considered aggregates of immunoglobulins.
• Previous understanding lacked definitive proof of immunoglobulin presence within Russell body cores.

Purpose of the Study:

• To investigate the precise molecular composition of Russell bodies.
• To determine if Russell bodies are solely composed of immunoglobulins or other cellular components.

Main Methods:

• Utilized light and electron microscopic immunoperoxidase staining techniques.
• Examined immunoglobulin presence within Russell body cores and surrounding cellular structures.

Main Results:

• No detectable immunoglobulin determinants were found in the cores of Russell bodies.
• Immunoglobulins were clearly demonstrated in the cytoplasm of plasma cells, ruling out widespread antigen denaturation.
• Immunoglobulins on the surface of small intracellular Russell bodies may originate from the endoplasmic reticulum.

Conclusions:

• Russell bodies likely contain non-immunoglobulin molecules, by-products of immunoglobulin synthesis, or altered immunoglobulins.
• The heterogeneous staining patterns suggest Russell bodies are not uniform in composition.
• This study reframes the understanding of Russell body composition and function.