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Delineating bone's interstitial fluid pathway in vivo.

Liyun Wang1, Cesare Ciani, Stephen B Doty

  • 1Department of Biomedical Engineering, City College of New York/CUNY, New York, NY 10031, USA.

Bone
|March 9, 2004
PubMed
Summary
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Small molecules readily move through bone

Area of Science:

  • Biomedical Engineering
  • Skeletal Biology
  • Fluid Dynamics

Background:

  • Bone's interstitial fluid pathway, crucial for osteocyte function, remains poorly understood.
  • The lacunar-canalicular porosity is hypothesized as the primary fluid conduit.
  • Conflicting data exists regarding the pore size and fiber spacing within this pathway.

Purpose of the Study:

  • To delineate the interstitial fluid pathway in rat long bone.
  • To determine the size limit for molecular transport through the lacunar-canalicular system.

Main Methods:

  • Injection of four tracers (1-10 nm) into rat vasculature.
  • Histological analysis of tibiae 5 minutes post-injection.
  • Quantification of tracer distribution in blood vessels and osteocytic lacunae.

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Main Results:

  • Tracers <6 nm successfully traversed canaliculi to reach osteocytic lacunae.
  • Ferritin (10 nm) did not reach osteocytic lacunae, indicating a size cutoff.
  • No tracers were detected within the mineralized bone matrix (collagen-apatite porosity).

Conclusions:

  • A molecular size cutoff between 6-10 nm exists for transport from capillaries to osteocytes.
  • This cutoff aligns with proposed proteoglycan fiber spacing in the lacunar-canalicular space.
  • The lacunar-canalicular porosity facilitates small molecule transport, essential for osteocyte metabolism.