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Extravascular albumin in bone tissue

M Owen, J T Triffitt

    The Journal of Physiology
    |May 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Albumin in bone tissue is largely fixed in the calcified matrix, unlike in soft tissues where it readily exchanges with plasma. Bone albumin clearance is rapid, with minimal daily incorporation into the matrix.

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    Area of Science:

    • Biochemistry
    • Physiology
    • Bone Biology

    Background:

    • Albumin is crucial for maintaining plasma oncotic pressure and fluid balance.
    • Understanding albumin distribution and exchange in different tissues is vital for physiological studies.

    Purpose of the Study:

    • To quantify extravascular albumin in various rabbit tissues, including bone.
    • To determine the exchangeability of albumin between plasma and extravascular spaces.
    • To investigate the kinetics of albumin in bone tissue.

    Main Methods:

    • Radial immunodiffusion was used to measure albumin concentrations.
    • Intravascular plasma volume was assessed using radiolabeled tracers (51Cr-erythrocytes, 125I-fibrinogen).
    • Albumin egress rates were estimated using 125I-albumin radioactivity in tissues over time.

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    Main Results:

    • Most extravascular albumin in kidney, intestine, skin, and muscle exchanges with plasma.
    • In bone, albumin in tissue fluid exchanges readily, but a significant fraction in the calcified matrix is fixed.
    • Bone tissue fluid albumin clears approximately hourly, faster than in skin/muscle but slower than in kidney.

    Conclusions:

    • Bone albumin exhibits unique compartmentalization, with a substantial portion fixed within the calcified matrix.
    • The total extravascular albumin in bone is comparable to soft tissues, but its exchange dynamics differ significantly.
    • Daily albumin incorporation into the bone matrix is minimal, suggesting long-term stability.