期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 22, 期 13, 页码 -出版社
MDPI
DOI: 10.3390/ijms22136662
关键词
acute liver failure; nitric oxide synthase uncoupling; cerebral blood flow; tetrahydrobiopterin
资金
- National Science Centre of the Republic of Poland (NCN) [2013/09/B/NZ4/00536, 2015/19/B/NZ4/01902]
Acute liver failure leads to deregulated nitric oxide signaling in the brain, resulting in reduced NOS activity and cofactor BH4 content, as well as eNOS uncoupling. These changes are associated with increased reactive oxidative species and decreased cerebral cortical blood flow, indicating a potential causal relationship between eNOS dysfunction and neurologic complications of ALF.
Acute liver failure (ALF) is associated with deregulated nitric oxide (NO) signaling in the brain, which is one of the key molecular abnormalities leading to the neuropsychiatric disorder called hepatic encephalopathy (HE). This study focuses on the effect of ALF on the relatively unexplored endothelial NOS isoform (eNOS). The cerebral prefrontal cortices of rats with thioacetamide (TAA)-induced ALF showed decreased eNOS expression, which resulted in an overall reduction of NOS activity. ALF also decreased the content of the NOS cofactor, tetrahydro-L-biopterin (BH4), and evoked eNOS uncoupling (reduction of the eNOS dimer/monomer ratio). The addition of the NO precursor L-arginine in the absence of BH4 potentiated ROS accumulation, whereas nonspecific NOS inhibitor L-NAME or EDTA attenuated ROS increase. The ALF-induced decrease of eNOS content and its uncoupling concurred with, and was likely causally related to, both increased brain content of reactive oxidative species (ROS) and decreased cerebral cortical blood flow (CBF) in the same model.
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