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Secretion of alpha-amylase by the embryonic chick pancreas in vitro
Insights
Chick embryo pancreases secrete amylase when stimulated, with secretion rates increasing with age. This digestive enzyme secretion ability develops over 10 days before the gland
Area of Science:
- Developmental biology
- Gastroenterology
- Endocrinology
Background:
- Pancreatic function in embryonic development is crucial for nutrient digestion.
- Understanding the timeline of pancreatic enzyme secretion is key to studying digestive system maturation.
Purpose of the Study:
- To determine when chick embryo pancreases acquire the ability to secrete amylase.
- To investigate the developmental timing of pancreatic digestive enzyme secretion.
Main Methods:
- In vitro culture of pancreases from chick embryos at various developmental stages.
- Stimulation of pancreatic tissue with cholinergic drugs.
- Measurement of amylase secretion rates.
Main Results:
- Pancreases from chick embryos secrete amylase in vitro upon cholinergic stimulation.
- Amylase secretion rates increase with embryonic developmental age.
- The ability to secrete amylase is present by 8 days of embryonic development.
Conclusions:
- Chick embryo pancreases gain the capacity for amylase secretion more than 10 days prior to observable maturation.
- Digestive enzyme secretion capability precedes significant biochemical and morphological changes in the developing pancreas.
Abstract:
Pancreases taken from chick embryos secrete amylase in vitro when stimulated by cholinergic drugs. Rates of secretion increase with developmental age. The pancreas isolated together with the duodenal loop from the 8 day embryo is already capable of secretion in vitro. It is therefore concluded that the pancreas acquires the ability to secrete digestive enzymes more than 10 days before the beginning of the prominent biochemical and morphological changes associated with the maturation of the gland.