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Pancreatic alpha cell function in the fetal foal during late gestation
A L Fowden1, A J Forhead, M Bloomfield
1Department of Physiology, University of Cambridge, UK. alf1000@cus.cam.ac.uk
Experimental Physiology
|September 11, 1999
Summary
Fetal equine alpha cells are functional in utero, responding to arginine but not glucose levels. However, these cells remain unresponsive to blood sugar changes until after birth.
Area of Science:
- Reproductive biology
- Endocrinology
- Perinatal physiology
Background:
- Pancreatic alpha cells produce glucagon, a hormone critical for glucose regulation.
- Understanding fetal endocrine function is vital for perinatal health and development.
Purpose of the Study:
- To investigate the functionality of fetal equine pancreatic alpha cells in late gestation.
- To examine fetal and maternal plasma glucagon concentrations and alpha cell responsiveness to stimuli.
Main Methods:
- Chronically catheterized fetal ponies and their mothers were studied from 260 days gestation to term.
- Plasma glucagon levels were measured, and fetal alpha cell responses to arginine and glucose variations were assessed.
Main Results:
- Immunoreactive glucagon was detected in fetal plasma, increasing significantly after 320 days gestation and at birth.
- Fetal alpha cells responded to arginine infusion but not to induced hyperglycemia or hypoglycemia.
- Maternal plasma glucagon increased with fasting, unlike fetal levels.
Conclusions:
- Equine pancreatic alpha cells are functional in utero.
- Fetal alpha cells exhibit limited responsiveness to glycemic changes until after birth, suggesting a developmental maturation process.