[Thyroid gland development in Japanese quail embryos incubating in microgravity]

Area of Science:

• Developmental biology
• Space biology
• Endocrinology

Background:

• Thyroid gland development is crucial for metabolic regulation.
• Understanding thyroid organogenesis under altered gravity is essential for space exploration.
• Previous studies have not investigated thyroid development in microgravity using Japanese quail models.

Purpose of the Study:

• To investigate the effects of microgravity on prenatal thyroid development in Japanese quail.
• To compare thyroid gland development stages between quail embryos in microgravity and on Earth.
• To identify potential mechanisms behind any observed developmental differences.

Main Methods:

• Japanese quail embryos were exposed to the MIR microgravity environment.
• Control embryos were maintained under standard laboratory conditions.
• Thyroid gland development was assessed by examining key organogenesis stages (trabecular and follicular).

Main Results:

• Both control and flight embryos progressed through similar thyroid development stages.
• Embryos developed in microgravity exhibited a significant retardation in thyroid gland development compared to controls.
• This developmental delay correlated with slower formation of the embryonic circulatory system and reduced blood supply to the thyroid.

Conclusions:

• Microgravity significantly impacts prenatal thyroid organogenesis in Japanese quail.
• Retarded thyroid development in microgravity is associated with cardiovascular system impairments.
• Further research is needed to understand the long-term implications of these findings for avian development in space.