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Macromolecule transfer through mesothelium and connective tissue.

F Bodega1, L Zocchi, E Agostoni

  • 1Istituto di Fisiologia Umana I, Università di Milano, 20133 Milano, Italy.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|November 25, 2000
PubMed
Summary

The rabbit pericardium

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Area of Science:

  • Physiology
  • Biophysics
  • Membrane Transport

Background:

  • The parietal pericardium is a serous membrane lining the thoracic cavity.
  • Understanding its permeability is crucial for studying fluid dynamics and solute exchange in the pericardial space.
  • Rabbit pericardium offers a viable model for permeability studies due to ease of acquisition.

Purpose of the Study:

  • To quantify the diffusional permeability of rabbit parietal pericardium to various solutes.
  • To differentiate the permeability characteristics of the mesothelium and the underlying connective tissue.
  • To elucidate the mechanisms of macromolecule transport across the pericardium.

Main Methods:

  • Diffusional permeability measurements using inulin, albumin, and dextrans of varying sizes (70-2000 Da).
  • Pericardial specimens were analyzed with and without mesothelium to isolate tissue layer contributions.
  • Experiments included modifications to assess the role of pore size and phospholipid interactions.

Main Results:

  • Permeability decreased significantly with increasing solute radius, indicating size-selective transport.
  • Mesothelium contributed substantially to the overall resistance to albumin diffusion (92%).
  • Macromolecule transport appears to involve large pores and/or transcytosis, distinct from small solute diffusion.

Conclusions:

  • Rabbit pericardial mesothelium exhibits size-dependent permeability, with small solutes passing through smaller pores (approx. 6 nm) and macromolecules via larger pathways.
  • The mesothelium plays a critical role in regulating solute exchange across the pericardium.
  • Pericardial permeability to macromolecules is higher than in capillary endothelium, suggesting specialized transport mechanisms.

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