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Analysis of subcutaneous fluid in rats
K E Wika1, K Muramoto, H Harasaki
1Department of Biomedical Engineering, Cleveland Clinic Foundation, OH 44195, USA.
ASAIO Journal (American Society for Artificial Internal Organs : 1992)
|November 14, 1997
Summary
Characterizing subcutaneous implantation in rats, this study found that exudate, not cells, drives biomaterial calcification. Elevated calcium and phosphorus in the exudate are key factors in this common research model.
Area of Science:
- Biomaterials Science
- Biomedical Engineering
- Tissue Engineering
Background:
- Subcutaneous implantation in rats is a prevalent model for studying biomaterial calcification.
- Previous characterization of the components within this model concerning calcification has been limited.
Purpose of the Study:
- To characterize the calcification potential of subcutaneous exudate and its components in a rat model.
- To investigate the role of exudate composition versus cellular presence in biomaterial calcification.
Main Methods:
- Exudate was collected from young rats using diffusion chambers, allowing only fluid passage.
- Glutaraldehyde-treated bovine pericardial strips were implanted both inside and outside diffusion chambers.
- Exudate and implanted materials were analyzed for calcification, ionic calcium, inorganic phosphorus, albumin, and cell presence.
Main Results:
- Calcification occurred in implanted materials regardless of cellular presence, indicating exudate's role.
- Subcutaneous exudate showed elevated ionic calcium, inorganic phosphorus, and a high calcium-phosphorus (Ca x P) product.
- Diffusion chambers successfully isolated exudate components, facilitating analysis.
Conclusions:
- The study identifies subcutaneous exudate, characterized by high calcium and phosphorus levels, as the primary driver of biomaterial calcification in this rat model.
- This finding is critical for understanding and refining the subcutaneous implantation model for biomaterial research.