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Developmental changes in vitamin A level and lack of retinyl palmitate in chick lungs
1Department of Nutrition, School of Food and Nutritional Sciences, University of Shizuoka, Japan.
Insights
Chick lung retinol levels dramatically change during development, peaking before hatching and after birth. This vitamin A derivative is crucial for lung maturation and cellular differentiation in developing chicks.
Area of Science:
- Biochemistry
- Developmental Biology
- Nutritional Science
Background:
- Retinol (vitamin A) is vital for numerous physiological processes, including vision, immune function, and cellular differentiation.
- Understanding vitamin A metabolism during embryonic and posthatch development is crucial for avian health and productivity.
Purpose of the Study:
- To investigate the developmental changes in retinol and retinyl palmitate concentrations within chick embryonic and posthatch lungs.
- To correlate lung retinol levels with serum retinol and liver vitamin A stores during development.
Main Methods:
- Quantification of retinol and retinyl palmitate in lung and liver tissues from chick embryos and posthatch chicks using established biochemical assays.
- Measurement of serum retinol levels at various developmental stages.
Main Results:
- Lung retinol content exhibited significant fluctuations, peaking late in embryonic development and again within the first week posthatch.
- Retinyl palmitate was undetectable in chick lungs throughout the studied developmental period.
- Lung retinol dynamics paralleled serum retinol levels, while liver vitamin A showed a different developmental pattern, increasing after hatching.
Conclusions:
- The dynamic changes in lung retinol during chick development suggest a critical role in embryonic lung cellular differentiation and maturation.
- The absence of retinyl palmitate in lungs indicates retinol is the primary circulating form of vitamin A influencing lung development in chicks.
Abstract:
1. Developmental changes in retinol and retinyl palmitate contents in lungs of chick embryos and posthatch chicks were investigated. 2. Remarkable changes in the lung retinol levels were found during development of chicks. Embryonic lungs 5 days prior to hatching contained the highest content of retinol. The level then declined rapidly and was lowest on 1 day before hatching. 3. Its level then rose substantially within 7 days after hatching. 4. No retinyl palmitate in chick lungs was detectable at any of the developmental stages examined, nor even in adult hen. 5. Serum retinol level changed in parallel with the lung retinol. 6. The patterns of changes in liver retinol and retinyl palmitate were remarkably different from that occurring in the lung retinol. In chick embryonic livers, the levels of them were low, followed by a rapid increase after hatching. 7. The high level and its rapid decrease of lung retinol content during development of chick embryos may be functionally connected with retinol action in embryonic lungs for cellular differentiation and maturation.