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Estrogen-induced sequential changes in avian bone metabolism.

R T Turner, H Schraer

    Calcified Tissue Research
    |December 28, 1977
    PubMed
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    Estradiol valerate induces medullary bone formation in quail by stimulating collagen synthesis and subsequent mineralization. Cellular differentiation precedes these bone formation processes.

    Area of Science:

    • Endocrinology
    • Bone Biology
    • Cellular Metabolism

    Background:

    • Medullary bone is a transient skeletal tissue crucial for calcium homeostasis in oviparous animals.
    • Estrogen is known to play a significant role in regulating bone metabolism.

    Purpose of the Study:

    • To elucidate the temporal sequence of metabolic events leading to estrogen-induced medullary bone formation in male Japanese quail.
    • To investigate the cellular and molecular mechanisms underlying osteogenesis stimulated by estrogen.

    Main Methods:

    • Administration of estradiol valerate to male Japanese quail.
    • Quantification of femur organic and ash weight over time.
    • Measurement of radiolabeled precursor uptake (3H-proline, 45Ca, 3H-uridine, 3H-thymidine) to assess collagen synthesis, mineralization, and nucleic acid synthesis.

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    Main Results:

    • Estrogen treatment rapidly increased femur organic weight (36h) and ash weight (96h).
    • Collagen synthesis (3H-proline uptake) peaked at 60h, followed by mineralization (45Ca uptake) onset at 24h post-collagen synthesis.
    • Increased 3H-uridine and 3H-thymidine uptake preceded medullary bone formation, indicating osteogenic precursor differentiation.

    Conclusions:

    • Estrogen-induced medullary bone formation involves a sequential process of osteogenic precursor differentiation, matrix synthesis, and mineralization.
    • The findings provide insights into the coordinated metabolic regulation of bone formation by estrogen.