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Role of thyroxine in functional gastric development.

C C Tseng, L R Johnson

The American Journal of Physiology

|July 1, 1986

Summary

Thyroxine (T4) precociously develops rat chief and parietal cells, increasing pepsinogen and acid output. This effect is mediated by corticosterone, not directly by thyroid hormones.

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Area of Science:

Endocrinology
Gastroenterology
Cell Biology

Background:

Thyroxine (T4) plays a crucial role in mammalian development.
The specific impact of T4 on the functional maturation of gastric chief and parietal cells requires further elucidation.
Understanding these developmental pathways is vital for comprehending gastric physiology.

Purpose of the Study:

To investigate the role of thyroxine (T4) in the functional development of gastric chief and parietal cells in rats.
To determine the mechanisms underlying T4's influence on pepsinogen and acid secretion.
To assess the interplay between thyroid hormones and adrenal hormones in gastric development.

Main Methods:

Rats were administered daily injections of thyroxine (T4).
Experiments included adrenalectomized rats and rats with propylthiouracil-induced hypothyroidism.
Corticosterone acetate was administered to evaluate its independent effects.

Main Results:

Thyroxine administration led to the premature appearance of pepsinogen and increased basal acid output.
The effects of thyroxine were abolished in adrenalectomized rats.
Hypothyroid rats exhibited reduced pepsinogen and basal acid secretion.
Corticosterone acetate administration enhanced pepsinogen and acid secretion independently of thyroid hormone levels.

Conclusions:

Thyroxine's influence on the development of chief and parietal cells is primarily mediated by concurrent alterations in serum corticosterone levels.
Corticosterone appears to be a key regulator in the T4-dependent maturation of gastric secretory cells.
These findings highlight a significant interaction between thyroid and adrenal axes in regulating gastric function development.

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