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Internal organization of plasma membranes during the acantholytic process. A freeze-fracture study
Abstract:
The internal organization of plasma membranes was studied in seven subjects with pemphigus vulgaris and in one subject with familial pemphigus using the freeze-fracture technique. The results obtained seem to suggest that the acantholytic process is produced in a similar fashion whatever the pathogenic agent and that desmosomes represent the "target" membrane specializations in the acantholytic phenomena. The reduction and eventual disappearance of desmosomal particle aggregations is seemingly accompanied by an increase in gap junctions.
Insights
Pemphigus vulgaris and familial pemphigus involve similar acantholysis, targeting desmosomes. Researchers observed reduced desmosomes and increased gap junctions during this process.
Area of Science:
- Dermatology
- Cell Biology
- Immunopathology
Background:
- Pemphigus vulgaris is an autoimmune blistering disease affecting the skin and mucous membranes.
- Familial pemphigus shares clinical and pathological features with pemphigus vulgaris.
- Understanding the cellular mechanisms of acantholysis is crucial for disease management.
Purpose of the Study:
- To investigate the internal organization of plasma membranes in pemphigus vulgaris and familial pemphigus.
- To elucidate the role of desmosomes and gap junctions in the acantholytic process.
Main Methods:
- Employed the freeze-fracture technique to examine plasma membrane ultrastructure.
- Studied tissue samples from seven subjects with pemphigus vulgaris and one with familial pemphigus.
Main Results:
- The freeze-fracture analysis revealed a consistent pattern of desmosomal changes in both conditions.
- A reduction and eventual disappearance of desmosomal particle aggregates were observed.
- An increase in gap junction frequency was noted concurrently with desmosome alterations.
Conclusions:
- The acantholytic process in pemphigus appears to be pathogenically similar, irrespective of the specific agent.
- Desmosomes are identified as the primary 'target' membrane specializations in pemphigus-related acantholysis.
- The observed increase in gap junctions may play a role in the cellular events during acantholysis.