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Ontogenetic development of pancreatic thyrotropin-releasing hormone in human foetuses and in infants
Insights
Thyrotropin-releasing hormone (TRH) and insulin exhibit distinct developmental patterns in the human pancreas during fetal and infant stages. Pancreatic TRH increases then decreases, while insulin steadily rises throughout development.
Area of Science:
- Endocrinology
- Developmental Biology
- Human Physiology
Background:
- Thyrotropin-releasing hormone (TRH) plays a crucial role in regulating the thyroid axis.
- The presence and function of TRH within the pancreas are not fully understood.
- Insulin is a key pancreatic hormone vital for glucose metabolism.
Purpose of the Study:
- To investigate the ontogeny of thyrotropin-releasing hormone (TRH) in the human pancreas.
- To compare the developmental trajectory of pancreatic TRH with that of insulin.
Main Methods:
- Human fetal pancreata (15-36 weeks gestation) and infant pancreata (1 year old) were analyzed.
- Quantification of thyrotropin-releasing hormone (TRH) and insulin content was performed.
Main Results:
- TRH was detected in the pancreas as early as 15 weeks gestation.
- Pancreatic TRH content increased until 34 weeks gestation, then decreased in late pregnancy and infancy.
- Pancreatic insulin content showed a continuous increase throughout gestation and the first year of life.
Conclusions:
- Thyrotropin-releasing hormone (TRH) and insulin display divergent ontogenetic patterns in the developing human pancreas.
- These findings suggest distinct roles or regulatory mechanisms for TRH and insulin during pancreatic development.
Abstract:
The ontogeny of thyrotropin-releasing hormone (TRH) in pancreata of human foetuses from 15-36 weeks of gestation and of infants has been studied. TRH was detectable in the pancreas of a 15 week old foetus; a progressive increase of pancreatic TRH content was observed until the 34th week of gestation, whereas a progressive decrease was found in the late period of pregnancy and in 1 year old infants. In contrast, the pancreatic insulin content showed a progressive increase during the entire pregnancy and in the first year after birth. These data indicate that TRH and insulin have different ontogenetic patterns in the human pancreas.