Bone marrow as a cell source for tissue engineering heart valves

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Bone marrow as a cell source for tissue engineering heart valves Tjörvi E Perry, MD, Sunjay Kaushal, MD, PhD, Fraser W.H Sutherland, MD, Kristine J Guleserian, MD, Joyce Bischoff, PhD, Michael Sacks, PhD, John E Mayer, MD  The Annals of Thoracic Surgery  Volume 75, Issue 3, Pages 761-767 (March 2003) DOI: 10.1016/S0003-4975(02)03776-1

Fig 1 (A) Light microscope photograph of early passage bone marrow-derived mesenchymal stem cells. The mesenchymal stem cells were double labeled with primary antibodies against SH2 (endoglin), α-smooth muscle actin, calponin, desmin (fluorescein-conjugated secondary antibodies), and CD31/PECAM-1 (Texas Red-conjugated secondary antibodies) (×40 before 30% reduction). (B) Cells stained uniformly positive for SH2 (endoglin) and negative for CD31/PECAM-1 (×40). (C) Cells stained uniformly positive for α-smooth muscle actin and negative for CD31/PECAM-1 (×40). (D) A subset of cells stained positive for calponin and negative for CD31/PECAM-1 (×40). (E) Cells stained uniformly positive for desmin and negative for CD31/PECAM-1 (×40). The Annals of Thoracic Surgery 2003 75, 761-767DOI: (10.1016/S0003-4975(02)03776-1)

Fig 2 (A) Light microscope photograph of early passage bone marrow-derived mesenchymal stem cells in their undifferentiated state (×100). (B) Light microscope photograph of the mesenchymal stem cells containing intracellular vacuoles (arrow) after induction with adipogenic cell culture medium (×100). The Annals of Thoracic Surgery 2003 75, 761-767DOI: (10.1016/S0003-4975(02)03776-1)

Fig 3 (A) Gross appearance of a tissue-engineered heart valve conduit as seen from above (arrow pointing to distal edge of conduit) and leaflets (asterisks) made from cells derived from bone marrow. (B) Tissue-engineered heart valve from side and (inset) unseeded polyglycolic acid/poly-4-hydroxybutyrate heart valve scaffold (arrow pointing to distal edge of conduit; asterisks on leaflets). The Annals of Thoracic Surgery 2003 75, 761-767DOI: (10.1016/S0003-4975(02)03776-1)

Fig 4 (A) Scanning electron microscopy of the surface of a tissue-engineered heart valve, and residual polyglycolic acid fibers (arrows). (B) Unseeded polyglycolic acid fibers (arrow) coated with poly-4-hydroxybutyrate. The Annals of Thoracic Surgery 2003 75, 761-767DOI: (10.1016/S0003-4975(02)03776-1)

Fig 5 (A) Histologic staining of a tissue-engineered heart valve showing cell confluence on both sides of the construct, as well as cells dispersed through the full thickness (×100 before 25% reduction). (B) Histologic staining of the surface (arrow) of a tissue-engineered heart valve (×400 before 25% reduction). The Annals of Thoracic Surgery 2003 75, 761-767DOI: (10.1016/S0003-4975(02)03776-1)

Fig 6 The effective stiffness of a tissue-engineered heart valve compared with the effective stiffness of a native leaflet. Unseeded polyglycolic acid/poly-4-hydroxybutyrate polymer has lost most of its strength after 4 weeks of in vitro conditioning. (TEHV = tissue-engineered heart valve.) The Annals of Thoracic Surgery 2003 75, 761-767DOI: (10.1016/S0003-4975(02)03776-1)