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American Journal of Pathology, Vol 113, 143-155, Copyright © 1983 by American Society for Investigative Pathology
REGULAR ARTICLES |
RJ Levy, FJ Schoen, JT Levy, AC Nelson, SL Howard and LJ Oshry
Bioprosthetic cardiac valve calcification is a frequent complication after long-term valve replacement. In this study the authors sought to examine the biologic determinants of this type of dystrophic calcification using subcutaneous implants of glutaraldehyde-preserved porcine aortic valve leaflets (GPVs) in rats. GPVs and clinical valvular bioprostheses were prepared identically. Retrieved implants were examined for calcification and the deposition of osteocalcin (OC), a vitamin K-dependent, bone-derived protein, that is found in other dystrophic and ectopic calcifications. GPVs implanted in 3-week-old rats calcified progressively (GPV Ca2+, 122.9 +/- 6.0 micrograms/mg) after 21 days, with mineral deposition occurring in a morphologic pattern comparable to that noted in clinical retrievals. Calcified GPVs accumulated osteocalcin (OC, 183.4 +/- 19.4 ng/mg); Nonpreserved porcine aortic leaflet implants did not calcify (Ca2+ + 5.6 +/- 1.0 micrograms/mg). Millipore diffusion chamber (0.45-mu pore size enclosed GPV implants accumulated calcium and adsorbed osteocalcin despite the absence of attached host cells. GPVs implanted for 21 days in 8-month- old rats calcified less (GPV Ca2+, 22.4 +/- 5.0 micrograms/mg) than did GPVs implanted in 3-week-old rats (see above). High-dose warfarin therapy (80 mg/kg) did not alter GPV calcification (GPV Ca2+, 39.6 +/- 2.9 micrograms/mg) in 72-hour subcutaneous implants in 3-week-old male rats, compared with control rats (GPV Ca2+, 40.8 +/- 4.8 micrograms/mg).
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