ABSTRACT
The biochemical integrity of the brain is necessary to maintain normal function. Oxidative damage is one of the mortal important reasons leading to the destruction of this integrity. The nervous system is enriched in phospholipid and polyunsaturated fatty acids (PUFAs). Due to the nature of high oxygen-consumption and rich lipids, brain is particularly vulnerable to oxidative damages. Phospholipid peroxidation is one of the results of imbalance in oxidation-antioxidant system. Once the antioxidant system is insufficient to resist oxidative damage, membrane phospholipids will be prone to free radical attack. Phospholipid peroxidation leads to a variety of toxic oxidation products, including membrane damage, mitochondrial dysfunction, rapid accumulation of amyloid, etc. Multiple proteins and nucleic acids can be covalently modified by peroxidation products, resulting in the loss of the protein functions, which eventually triggers programmed cell death and general neuroinflammation in brain, and ends up with an increased susceptibility to neurodegenerative diseases. Based on the knowledge of mechanisms of phospholipid peroxidation, this review focuses on the characteristics of phospholipid peroxidation as a key factor in the development of neurodegenerative diseases, in order to provide theoretical basis for targeted intervention of phospholipid peroxidation as a potential strategy to prevent neurodegenerative diseases.
ABSTRACT
The aim of this paper is to investigate the effect of patchouli alcohol in enhancing Helicobater pylori's action in eradicating macrophages and its mechanism. H. pylori was co-cultured with macrophages at a ratio of MOI=100 in different concentrations of patchouli alcohol. The effect of patchouli alcohol in eradicating macrophages was detected by agar dilution method. The effect of patchouli alcohol on NO and myeloperoxidase (MPO) levels in macrophages were measured by H. pylori by biochemical methods. Patchouli alcohol effect on H. pylori-induced pro-inflammatory gene expression and protein secretion in macrophages were detected by RT-qPCR and ELISA method. The eradication of H. pylori has significantly enhanced, and the destabilization of lysosomes has been reversed. Meanwhile, patchouli alcohol has an effect in inhibiting pro-inflammation and oxidation. The mechanism of patchouli alcohol in eradicating H. pylori and resisting oxidative stress may be associated to the blocking of bacteria escape lysosome combination procedures.
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the effects of oral contraceptive pretreatment (OCP) in patients with polycystic ovarian syndrome (PCOS) undergoing controlled ovarian hyperstimulation for IVF-ET.</p><p><b>METHODS</b>We randomly divided 85 patients with P-COS undergoing IVF-ET into an OCP (n = 53) and a control group (n = 32), the former received OCP, while the latter did not before the cycle. We retrospectively analyzed the data of the patients for the ovulation promoting effect of OCP and its influence on the incidence of ovarian hyperstimulation syndrome (OHSS) and outcomes of IVF-ET.</p><p><b>RESULTS</b>Compared with the control group, OCP significantly reduced the formation of ovarian cyst (P < 0.05), remarkably increased the duration of gonadotropin stimulation and consumption (P < 0.01) , and markedly raised the percentage of mature ova (87.92% vs 92.85%, P < 0.05). But no significant differences were observed between the two groups in the incidences of moderate and severe OHSS, number of retrieved oocytes, and rates of fertilization, miscarriage and clinical pregnancy.</p><p><b>CONCLUSION</b>OCP for patients with PCOS can help to control the time of ovarian stimulation, improve the synchronism of follicular development, and increase the duration of gonadotropin stimulation and consumption, but cannot change the incidences of moderate and severe OHSS.</p>