Abstract
Hypoxia-inducible factor-1alpha (HIF-1α) expression promotes angiogenesis and can influence stem cell engraftment. We investigated the effect of stable over-expression of constitutively active HIF-1α on cardiosphere-derived cell (CDC) engraftment and left ventricular function. CDCs were transduced with a lentivirus expressing a constitutively active mutant of human HIF-1α (LVHIF-1α). Two million male rat CDCs were injected into the infarct following ligation of the mid-LAD in female syngeneic rats. Left ventricular ejection fraction (EF) and circumferential strain were measured by echocardiography at 1 and 4 weeks post-MI in the following groups: PBS group (n = 7), CELL group (n = 7), and CELL-HIF group (n = 7). HIF-1α, VEGF, endothelin-1 expression, and CDC engraftment were measured by quantitative PCR. At 30 days, EF was unchanged in the CELL-HIF group (p = NS), increased in the CELL group (p = 0.025), and decreased in the PBS group (p = 0.021), but engraftment was similar (2.4% ± 3.3% vs 1.7% ± 0.8%, p = NS). Mean circumferential strain of the infarcted region was unchanged in the CELL-HIF group, but improved in the CELL group (p = 0.02). Endothelin-1 and VEGF expression were higher in HIF-CDCs exposed to hypoxia, compared with non-transduced CDCs. HIF-1α expression in CDCs blunted the beneficial functional effects of CDC transplantation, suggesting that paracrine factor balance may play an important role in cardiac regeneration.
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Abbreviations
- CDC:
-
Cardiophere-derived cells
- HIF-1α:
-
Hypoxia-inducible factor-1alpha
- VEGF:
-
Vascular endothelial growth factor
- IL-1β:
-
Interleukin-1 beta IL-1β
- ET-1:
-
Endothelin-1
- eGFP:
-
Green fluorescent protein
- qPCR:
-
Quantitative Polymerase Chain Reaction
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Acknowledgments
We are grateful to Dr. Farhad Vesuna for help with qPCR, Lee Blosser from the Flow Cytometry Core Analytic Laboratory for help with flow cytometry, Ms. Dana Kemmer for administrative assistance, and Ms. Missy Leppo for helpful advice.
Sources of Funding
This study was supported by the WW Smith Foundation (West Conshohocken, PA; MRA), AHA (Dallas, TX; MRA), Maryland TEDCO (Columbia, MD; MRA), NIH RO1 HL092985 (Bethesda, MD; MRA/FB), and GE healthcare (Waukesha, WI).
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Michael Bonios and Connie Y. Chang contributed equally to the work.
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Bonios, M., Chang, C.Y., Terrovitis, J. et al. Constitutive HIF-1α Expression Blunts the Beneficial Effects of Cardiosphere-Derived Cell Therapy in the Heart by Altering Paracrine Factor Balance. J. of Cardiovasc. Trans. Res. 4, 363–372 (2011). https://doi.org/10.1007/s12265-011-9265-3
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DOI: https://doi.org/10.1007/s12265-011-9265-3