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Exogenous triiodothyronine activates bone remodeling.

C Hasling, E F Eriksen, P Charles

    Bone
    |January 1, 1987
    PubMed
    Summary
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    Exogenous triiodothyronine (T3) activates bone remodeling, initiating resorption then formation. This study suggests T3 can synchronize bone remodeling cycles for potential osteopenic treatments.

    Area of Science:

    • Endocrinology
    • Bone Biology
    • Metabolic Bone Disease

    Background:

    • Bone remodeling is a continuous process involving resorption and formation.
    • Dysregulation of bone remodeling contributes to osteopenic states.
    • Activators of bone remodeling cycles are sought for therapeutic applications.

    Purpose of the Study:

    • To investigate the effect of exogenous triiodothyronine (T3) on bone remodeling.
    • To determine if T3 can act as an activator of bone remodeling.
    • To evaluate the temporal sequence of bone resorption and formation induced by T3.

    Main Methods:

    • Administration of exogenous triiodothyronine (T3) to 14 participants for one week.
    • Measurement of serum and urinary biochemical markers of bone metabolism over 10 weeks.

    Related Experiment Videos

  • Assessment of thyroid hormone levels (T3, TSH, T4) and bone turnover markers (calcium, phosphate, hydroxyproline, osteocalcin, alkaline phosphatase).

    • Main Results:

    • Exogenous T3 administration led to increased serum T3 and decreased TSH and T4.
    • Bone resorption markers (serum calcium, urinary calcium, phosphate, hydroxyproline) increased during the first week.
    • Bone formation markers (serum osteocalcin, alkaline phosphatase) showed a delayed increase, indicating a sequential remodeling process.

    Conclusions:

    • Exogenous triiodothyronine (T3) effectively activates bone remodeling, initiating resorption followed by formation.
    • The temporal pattern of T3-induced bone remodeling aligns with established bone histomorphometry findings.
    • T3 shows potential as an 'activator' drug to synchronize skeletal remodeling for treating osteopenic conditions, possibly in conjunction with antiresorptive agents.