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Glicentin precedes glucagon in the developing human pancreas
Endocrinology
|June 1, 1982
Summary
Human fetal pancreas development reveals distinct endocrine cell changes. Pancreatic polypeptide cells increase with age, while glucagon-producing cells mature from a precursor type not found in adults.
Area of Science:
- Endocrinology
- Developmental Biology
- Histology
Background:
- The human fetal pancreas undergoes significant endocrine cell differentiation.
- Understanding the developmental trajectory of pancreatic endocrine cells is crucial for comprehending metabolic regulation.
- Previous studies have provided insights into the presence of various islet cell types during fetal development.
Purpose of the Study:
- To quantitatively evaluate the immunofluorescence of key endocrine cell types (insulin, glucagon, glicentin, somatostatin, pancreatic polypeptide) in the developing human fetal pancreas.
- To investigate the proportional changes and developmental patterns of these endocrine cells during fetal growth.
- To explore the potential origin and maturation process of the adult pancreatic A-cell.
Main Methods:
- Quantitative immunofluorescence analysis was performed on pancreatic tissue from five human fetuses (3.0 to 9.6 cm C.R.).
- Specific antisera targeting insulin, glucagon, glicentin, somatostatin, and pancreatic polypeptide were used.
- Cellular proportions and staining patterns (e.g., GLI-cells, GLI/GLU-cells) were analyzed in relation to fetal age.
Main Results:
- Insulin and somatostatin cell proportions remained relatively stable across the studied fetal ages.
- Pancreatic polypeptide-containing cells increased proportionally with fetal growth.
- Youngest fetuses showed a high proportion of glicentin-only (GLI) cells and fewer glicentin/glucagon (GLI/GLU) cells. Older fetuses exhibited an increase in GLI/GLU cells and a decrease in GLI cells, with GLI/GLU cells resembling adult A-cells.
Conclusions:
- The proportion of pancreatic polypeptide cells increases during human fetal development.
- The adult pancreatic A-cell appears to mature from a precursor GLI-cell type that cannot convert glucagon precursors.
- This study elucidates the dynamic changes in pancreatic endocrine cell populations during human fetal development, suggesting a specific maturation pathway for glucagon-producing cells.