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Stem Cell Research Laboratory, The Charles A. Dana Research Institute and Harvard-Thorndike Laboratory, Cardiovascular Division, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02215
Despite considerable
advances in medicine, the incidence of heart failure remains high in
patients after myocardial infarction (MI). This study investigated the
effects of engrafted early-differentiated cells (EDCs) from mouse
embryonic stem cells, with or without transfection of vascular
endothelial growth factor (VEGF) cDNA (phVEGF165),
on cardiac function in postinfarcted mice. EDCs were transfected with
green fluorescent protein (GFP) cDNA and transplanted into infarcted
myocardium. Compared with the MI mice receiving cell-free medium,
cardiac function was significantly improved in the MI mice 6 wk after
transplantation of EDCs. Moreover, improvement of heart function was
significantly greater in the mice implanted with EDCs overexpressing
VEGF (EDCs-VEGF) than with EDCs alone. Frozen sections of infarcted
myocardium with EDCs or EDCs-VEGF transplantation showed GFP-positive
tissue. The area with positive immunostaining for cardiac troponin I
and
-myosin heavy chain was larger in injured myocardium with EDCs
or EDCs-VEGF transplantation than with medium injection.
Transplantation of EDCs or EDCs-VEGF significantly increased the number
of blood vessels in the MI area. However, the density of capillaries
was significantly higher in the EDCs-VEGF animals than in the EDC mice.
Double staining for GFP and connexin-43 was positive in injured
myocardium with EDC transplantation. Our data demonstrate that
engrafted EDCs or EDCs-VEGF regenerated cardiac tissue and
significantly improved cardiac function in postinfarcted hearts. The
novel EDCs-VEGF synergistic approach may have an important impact on
future cell therapy for patients experiencing MI or heart failure.
embryonic stem cells; vascular endothelial growth factor; myocardial infarction; cell transplantation
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