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The basic structural lesion of persistent neonatal hypoglycaemia with hyperinsulinism: deficiency of pancreatic D
Insights
Infantile hyperinsulinism in infants is linked to increased pancreatic polypeptide cells and decreased somatostatin cells. Enhanced B-cell nuclear volume suggests heightened functional activity, aiding diagnosis.
Area of Science:
- Endocrinology
- Pathology
- Pediatric Research
Background:
- Persistent hyperinsulinemic hypoglycemia is a critical neonatal condition.
- Understanding islet cell alterations is key to diagnosing and managing infantile hypoglycemia.
Purpose of the Study:
- To investigate pancreatic islet cell morphometry in infants with persistent hyperinsulinemic hypoglycemia.
- To identify specific cellular changes associated with infantile hypoglycemia for diagnostic and therapeutic insights.
Main Methods:
- Morphometric analysis and immunocytochemical staining of pancreatic tissue from 15 infants with hypoglycemia and 23 controls.
- Evaluation of islet cell types (A, B, D, pancreatic polypeptide) and nuclear volume.
Main Results:
- Markedly augmented pancreatic polypeptide cells and significantly decreased somatostatin cells observed in hypoglycemic infants.
- Increased mean nuclear volume of B cells (40%) in diffuse cases, localized to focal lesions in others, indicating enhanced functional activity.
- Nesidioblastosis was not specific to hypoglycemia, appearing in controls as well.
Conclusions:
- Increased B-cell nuclear size is a significant diagnostic indicator of enhanced functional activity in infantile hyperinsulinism.
- Alterations in pancreatic polypeptide and somatostatin cell densities are characteristic of the condition.
- Findings have implications for diagnosis and therapeutic strategies in persistent hyperinsulinemic hypoglycemia.
Abstract:
Pancreatic tissue obtained at subtotal pancreatectomy from 15 infants with persistent hypoglycaemia with hyperinsulinism, and autopsy specimens from 23 age-matched normoglycaemic controls, were studied with morphometric methods after immunocytochemical staining of the four main islet cell types (A, B, D and pancreatic polypeptide cells). In three cases, a focal lesion was detected by gross examination. Macroscopic or microscopic examination did not distinguish the 12 other cases from controls. As found previously, nesidioblastosis was not a specific feature of the pancreas in infantile hypoglycaemia, being observed in age-matched controls as well. In cases with hypoglycaemia the volume density of B cells was not significantly increased; that of the A cells was within normal range. The volume density of pancreatic polypeptide cells was markedly augmented and that of somatostatin cells was significantly decreased. The mean nuclear volume of the B cells was increased by 40% in cases with diffuse changes, but in cases with a focal lesion this increase was restricted to the abnormal area. This finding is of decisive importance for diagnosis and has therapeutic implications. The increase in B-cell nuclear size is thought to reflect an enhanced functional activity of these cells. On the other hand, the figures obtained for the volume density of B and D cells must be viewed with some reservation because degranulation may interfere with accurate detection of these cells.