Myocardial Hypertrophy and Angiogenesis Response to Hypoxia
Author Information
Author(s): Choi Yeong-Hoon, Cowan Douglas B., Nathan Meena, Poutias Dimitrios, Stamm Christof, del Nido Pedro J., McGowan Francis X. Jr
Primary Institution: Children's Hospital Boston and Harvard Medical School
Hypothesis
The physiological pro-angiogenic response to cyanosis in the hypertrophied myocardium is blunted through differential HIF and VEGF-associated signaling.
Conclusion
In infant rabbit hearts with pressure overload hypertrophy, the pro-angiogenic response to hypoxia is effectively uncoupled due to altered HIF-mediated signaling and VEGFR subtype expression.
Supporting Evidence
- Capillary density was significantly reduced in animals with pressure-overload hypertrophy.
- Hypoxia did not induce increased vascularization in hypertrophied hearts.
- HIF-2α and VEGFR-2 expression were reduced in left ventricular hypertrophy.
Takeaway
When baby rabbits with heart problems were put in a low-oxygen environment, their hearts didn't grow new blood vessels like healthy hearts did, which could make them more sick.
Methodology
Newborn rabbits underwent aortic banding and were placed in a hypoxic chamber to assess the angiogenic response and related signaling pathways.
Limitations
The study's conclusions are based on associations, and further experiments are needed to establish cause-effect relationships.
Participant Demographics
Newborn New Zealand White rabbits.
Statistical Information
P-Value
<0.001
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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