Hypoxia inducible factor-1alpha expression correlates with inflammatory injury of blood-brain barrier which influences perihaematomal edema after intracerebral hemorrhage
Jian Wu , Fuli Yan , Yiming Li , Mingang Liang , Yu Guo , Mingfei Yang
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引用次数: 0
Abstract
Backround
In patients with intracerebral hemorrhage (ICH), perihematomal edema (PHE) significantly worsens the prognosis. This condition leads to the formation of a hypoxic microenvironment surrounding the blood-brain barrier (BBB), which in turn activates hypoxia-inducible factor-1 alpha (HIF-1α), a highly sensitive hypoxia-related transcription factor. Additionally, tumor necrosis factor-alpha (TNF-α) emerges as a promising biomarker for tracking inflammation in the vicinity of the BBB. The integrity of the BBB is maintained by proteins such as zonula occludens-1 (ZO-1), which is crucial for the tight junctions that regulate the barrier's permeability. Understanding these mechanisms is vital for developing targeted therapies to mitigate the effects of ICH.
Object
Through the collection and analysis of peripheral blood and tissue samples from ICH patients and animal models at predefined time points, we established the correlation between HIF-1α expression, inflammatory damage to the BBB, and the development of PHE.
Methods
Ethical approval was secured from relevant Chinese authorities and the Ethics Committee of Qinghai Provincial People's Hospital. The clinical study included 32 ICH patients, with computerized tomographic scans and blood samples taken at 1, 3, 7, and 14 days post-ICH. HIF-1α and ZO-1 expression, as well as TNF-α levels, were measured using enzyme-linked immunosorbent assay, quantitative real-time polymerase chain reaction, and western blot. In the animal study, 18 adult Sprague Dawley rats were divided into sham, ICH, and HIF-1α Inhibited groups. Lificiguat YC-1 was used to inhibit HIF-1α expression, and samples were collected at the critical change point identified clinically for similar measurements.
Results
At 3 days after onset, the highest level of HIF-1α and TNF-α, the lowest level of ZO-1 and the most obvious development in PHE appeared in ICH patients (F ≥ 10.278, P ≤ 0.004). At that day, HIF-1α expression positively correlated with TNF-α levels (r = 0.809, P<0.001); TNF-α negatively correlated with ZO-1 expression (r=-0.840, P<0.001) which negatively correlated with PHE development (r=-0.601, p<0.001). Comparing to sham group and sole ICH group, after HIF-1α expression was inhibited, all the biological indicators level of ICH rats were the lowest (F ≥ 14.953, p ≤ 0.005). Their correlation were the same as that in ICH patients.
Conclusion
At 3 days after onset of ICH, HIF-1α expression correlated with inflammatory injury of BBB, which influenced PHE.
期刊介绍:
The Journal of Stroke & Cerebrovascular Diseases publishes original papers on basic and clinical science related to the fields of stroke and cerebrovascular diseases. The Journal also features review articles, controversies, methods and technical notes, selected case reports and other original articles of special nature. Its editorial mission is to focus on prevention and repair of cerebrovascular disease. Clinical papers emphasize medical and surgical aspects of stroke, clinical trials and design, epidemiology, stroke care delivery systems and outcomes, imaging sciences and rehabilitation of stroke. The Journal will be of special interest to specialists involved in caring for patients with cerebrovascular disease, including neurologists, neurosurgeons and cardiologists.