Key result
3-IAId reduces BAPN-induced aortic dissection mortality by ~35 percentage points in mice.
Why the study?
The specific relationship between tryptophan metabolism, particularly indole-3-aldehyde, and the occurrence of aortic dissection remains unclear.
Does Indole-3-aldehyde treatment improve survival and prevent aortic dissection in a BAPN-induced murine model?
Does Indole-3-aldehyde treatment improve survival and prevent aortic dissection in a BAPN-induced murine model?
Absolute Event Rate: 20% vs 55%
Absolute Risk Reduction: 35%
p-value: p=0.0060
The gut microbiota-derived tryptophan metabolite 3-IAId protects against aortic dissection and rupture in a murine model, providing insights into a potential novel therapeutic or nutritional intervention strategy.
Should not change clinical practice; leaves open therapeutic potential of 3-IAId in aortic dissection.
Tryptophan, an essential dietary amino acid, is metabolized into various metabolites within both gut microbiota and tissue cells. These metabolites have demonstrated potential associations with panvascular diseases. However, the specific relationship between tryptophan metabolism, particularly Indole-3-aldehyde (3-IAId), and the occurrence of aortic dissection (AD) remains unclear. 3-IAId showed an inverse association with advanced atherosclerosis, a risk factor for AD. In this study, we employed a well-established β-aminopropionitrile monofumarate (BAPN)-induced AD murine model to investigate the impact of 3-IAId treatment on the progression of AD. Our results reveal compelling evidence that the administration of 3-IAId significantly mitigated aortic dissection and rupture rates (BAPN + 3-IAId vs. BAPN, 45% vs. 90%) and led to a notable reduction in mortality rates (BAPN + 3-IAId vs. BAPN, 20% vs. 55%). Furthermore, our study elucidates that 3-IAId exerts its beneficial effects by inhibiting the phenotype transition of vascular smooth muscle cells (VSMCs) from a contractile to a synthetic state. It also mitigates extracellular matrix degradation, attenuates macrophage infiltration, and suppresses the expression of inflammatory cytokines, collectively contributing to the attenuation of AD development. Our findings underscore the potential of 3-IAId as a promising intervention strategy for the prevention of thoracic aortic dissection, thus providing valuable insights into the realm of vascular disease management.
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Huang et al. (2023) studied Aortic Dissection (n=52). Indole-3-aldehyde (3-IAId) vs. BAPN alone was evaluated on Mortality rate (p=0.0060). Administration of 3-IAId significantly reduced BAPN-induced mortality from 55% to 20% and mitigated aortic dissection and rupture rates in a murine model.
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