Article

Clinical pulmonary autograft valves: pathologic evidence of adaptive remodeling in the aortic site.

Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.
Journal of Thoracic and Cardiovascular Surgery (impact factor: 3.41). 10/2004; 128(4):552-61. DOI:10.1016/j.jtcvs.2004.04.016 pp.552-61
Source: PubMed

ABSTRACT We studied the pathologic features, cellular phenotypes, and matrix remodeling of clinical pulmonary-to-aortic valve transplants functioning up to 6 years.
Nine autografts and associated vascular walls early (2-10 weeks) and late (3-6 years) postoperatively were examined by using routine morphologic methods and immunohistochemistry. In 4 cases autograft and homograft cusps were obtained from the same patients.
Autografts had near-normal trilaminar cuspal structure and collagen architecture and viable valvular interstitial and endothelial cells throughout the time course. In contrast, cusps of homografts used to replace the pulmonary valves in the same patients were devitalized. In early autograft explants, 19.3% +/- 2.4% of cuspal interstitial cells were myofibroblasts expressing alpha-actin. In contrast, myofibroblasts comprised only 6.0% +/- 1.1% of cells in late explants and 2.5% +/- 0.4% and 4.6% +/- 0.8% of cells in normal pulmonary and aortic valves, respectively (P <.05). In early autografts only 12.0% +/- 4.6% of endothelial cells expressed the systemic arterial endothelial cell marker EphrinB2, whereas later explants had 85.6% +/- 5.4% of endothelial cells expressing EphrinB2 (P <.05). In early autografts 43.8% +/- 8.8% of interstitial cells expressed metalloproteinase 13, whereas late autografts had 11.4% +/- 2.7% of interstitial cells expressing matrix metalloproteinase 13 (P <.05). Collagen content in autografts was comparable with that of normal valves and was higher than that seen in homograft valves (P <.005). However, autograft walls were damaged, with granulation tissue (early) and scarring, with focal loss of normal smooth muscle cells, elastin, and collagen (late).
The structure of pulmonary valves transplanted to the systemic circulation evolved toward that of normal aortic valves. Key processes in this remodeling included onset of a systemic endothelial cell phenotype and reversible plasticity of fibroblast-like valvular interstitial cells to myofibroblasts.

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Keywords

3-6 years
 
4 cases autograft
 
6 years
 
autograft walls
 
cellular phenotypes
 
clinical pulmonary-to-aortic valve transplants
 
cuspal interstitial cells
 
endothelial cells
 
fibroblast-like valvular interstitial cells
 
granulation tissue
 
interstitial cells
 
Key processes
 
normal aortic valves
 
normal pulmonary
 
normal smooth muscle cells
 
pathologic features
 
routine morphologic methods
 
systemic endothelial cell phenotype
 
vascular walls
 
viable valvular interstitial