When vascular smooth muscle cells lack iron, they produce more HIF1 protein and change from a stable, contractile state to a less stable, synthetic state, marked by reduced levels of α-SMA and SM-22α...
Mechanism
Synthesis from 1 study
Without enough iron, the cells in the aorta act like they're starved for oxygen, which flips a switch that turns them from strong, supportive cells into weak, destructive ones. These changed cells break down the aorta's internal structure, making it prone to rupture.
Most probable mechanism
When there isn't enough iron in the cells of the aorta, the cells can't use oxygen properly, which tricks them into thinking they're suffocating. This triggers a protein that turns on a set of genes that make the cells stop acting like strong, contractile walls and start acting like messy, repair-mode cells that break down the artery's structure. These changed cells release enzymes that chew up the elastic fibers holding the aorta together, making the wall weak and prone to tearing.
Iron deficiency reduces cellular oxygen availability by limiting hemoglobin synthesis and oxygen delivery, creating a hypoxic environment in vascular smooth muscle cells
Hypoxia and associated oxidative stress inhibit prolyl hydroxylase enzymes, preventing the hydroxylation and subsequent degradation of HIF1α, leading to its accumulation and nuclear translocation
Stabilized HIF1α dimerizes with HIF1β and binds to hypoxia-response elements in the DNA, activating transcription of target genes including VEGF, OPN, MMP2, and MMP9
Upregulation of VEGF and other HIF1 targets suppresses expression of contractile markers α-SMA and SM-22α while promoting a synthetic phenotype characterized by extracellular matrix remodeling
Increased secretion of MMP2 and MMP9 degrades elastic fibers and collagen in the aortic media, leading to structural weakening and loss of vessel integrity
Evidence from Studies
Supporting (1)
Community contributions welcome
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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