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Pancreatic islet cell damage. Its occurrence in neonatal coxsackievirus encephalomyocarditis
Insights
Coxsackievirus infection in infants can damage pancreatic islet cells, potentially leading to juvenile diabetes mellitus. This viral tropism suggests a role in the development of diabetes after initial injury.
Area of Science:
- Virology
- Endocrinology
- Pathology
Background:
- Neonatal coxsackievirus encephalomyocarditis can affect multiple organs.
- The role of viral infections in the pathogenesis of juvenile diabetes mellitus is under investigation.
Purpose of the Study:
- To investigate islet cell damage in infants with coxsackievirus encephalomyocarditis.
- To determine if coxsackievirus specifically targets pancreatic islet cells.
Main Methods:
- Histopathological examination of pancreata from five infants with coxsackievirus encephalomyocarditis.
- Immunostaining to identify specific cell types and assess lesion specificity.
Main Results:
- Four out of five infants showed significant islet cell damage, ranging from pyknotic nuclei to total necrosis.
- The observed lesions were characteristic of coxsackievirus and not present in control cases with other viral infections.
- Immunostaining confirmed damage to various islet cell types, not exclusively beta cells.
Conclusions:
- Coxsackievirus demonstrates tropism for pancreatic islet cells, causing characteristic lesions.
- Viral-induced islet cell damage may contribute to the development of juvenile diabetes mellitus.
- The involvement of all islet cell types supports theories of genetically determined failure to regenerate beta cells post-viral injury.
Abstract:
Pancreata from five infants with culture-proven coxsackievirus encephalomyocarditis were studied for evidence of islet cell damage. Four of the five showed islet cell change, varying from clusters of cells with pyknotic nuclei to total islet necrosis. The lesion appeared to be characteristic of coxsackievirus and was not seen in the pancreata of neonates with other neonatal systemic viral infections. This confirms that coxsackievirus shows tropism for insular tissue and may play a role in the genesis of some cases of juvenile diabetes mellitus. Immunostaining was used to ascertain the specificity of the lesions. Damage to cells other than beta cells could be clearly demonstrated. The finding that all islet cell types may be involved lends support to the theory that juvenile diabetes mellitus may be a genetically determined failure to reconstitute the beta cells after viral injury.