Low iron levels in humans and mice are linked to higher activity of the HIF1 protein in the aorta, increased signs of oxidative stress, and damage to the middle layer of the aorta, which may...
Mechanism
Synthesis from 1 study
Not enough iron means less oxygen gets to the aorta, which triggers a stress signal that changes the muscle cells in the wall into weak, destructive cells. These cells break down the strong fibers that hold the aorta together, making it more likely to tear.
Most probable mechanism
When the body doesn't have enough iron, it can't carry oxygen well, which tricks cells in the aorta into thinking they're starved for oxygen. This triggers a stress response that turns on a protein called HIF1, which then tells smooth muscle cells in the aorta to change from strong, contractile cells into weak, messy cells that break down the wall's structural fibers. As these fibers fall apart, the aorta becomes fragile and prone to tearing.
Reduced iron availability impairs hemoglobin function, lowering oxygen delivery to aortic tissue and creating a localized hypoxic environment.
Hypoxia and associated oxidative stress inhibit prolyl hydroxylase enzymes, preventing the normal degradation of HIF1α, leading to its accumulation and nuclear translocation.
Nuclear HIF1 binds to DNA and activates transcription of target genes, including VEGF, which drives a shift in vascular smooth muscle cells from a contractile to a synthetic phenotype.
Synthetic vascular smooth muscle cells increase secretion of matrix-degrading enzymes, such as MMP2 and MMP9, which break down elastic fibers and collagen in the aortic media.
Loss of structural integrity in the aortic media weakens the vessel wall, increasing susceptibility to rupture and dissection.
Evidence from Studies
Supporting (1)
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Iron deficiency affects oxygen transport and activates HIF1 signaling pathway to regulate phenotypic transformation of VSMC in aortic dissection
Contradicting (0)
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