Objective To investigate the cerebral protection of Memantine in neonatal rats with hypoxic ischemia. Methods Memantine was intraperitoneally injected at a dose of 20 mg/kg in neonatal rats of cerebral hypoxic ischemia (HI). Employing a quantized score system of cerebral pathology for hypoxic ischemia developed, the neuroprotective effect of Memantine was evaluated pathologically. Results There were significantly decreased scores in either PRE group (Memantine was given one hour before HI) or POST group (Memantine was given after HI immediately) comparing to HI group with higher score. Conclusion Memantine can improve cerebral hypoxic ischemic damage significantly, and be potentially valuable for the treatment of neonatal hypoxic ischemic brain damage.

This paper analyzed and discussed on the importance of doctor-patient communica-tion skills and the differences between foreign countries and China. Meanwhile, it pointed out the drawbacks of doctor-patient communication skills training for medical students in China and proposed some countermeasures including finding out influence factors, searching for reference books, provid-ing guide for doctor-patient communication theory and skills, formulating teaching pattern, building evaluation mechanism, and establishing a communication platform of doctor-patient communication skills for medical students.

ObjectiveTo observe the effect of Simiaowan on the intestinal ATP-binding cassette superfamily G （White） member 2 （ABCG2） expression and the intestinal uric acid excretion in hyperuricemia rats. MethodA total of 48 SD male rats were randomized into the normal， model， benzbromarone （4.7 mg·kg^-1）， and high-， medium-， low-dose Simiaowan groups （2 260.6， 1 130.3， 565.2 mg·kg^-1， respectively）， with 8 rats in each group. Potassium oxonate and hypoxanthine was employed to induce hyperuricemia in rats （21 days）. On the 8^th day， administration began （once a day for 14 days）. Rats were killed on the 21^st day， and serum uric acid， serum creatinine， blood urea nitrogen， and intestinal uric acid were detected. The protein expression of ABCG2 in the small intestine was detected by Western blot. The ABCG2 protein expression and localization in intestinal tissues were determined by immunohistochemistry. The ABCG2 mRNA expression in small intestine was measured by quantitative real-time PCR. ResultThe levels of serum uric acid， serum creatinine， and blood urea nitrogen in the model group were higher than those in the normal group （P<0.01）. Low level of serum uric acid in the three Simiaowan groups and benzbromarone group （P<0.01）， high level of intestinal uric acid in medium-dose and low-dose Simiaowan groups （P<0.05， P<0.01）， high level of serum creatinine in benzbromarone group （P<0.01）， and low level of blood urea nitrogen in low-dose Simiaowan group （P<0.05） were observed as compared with those in the model group. Serum uric acid showed insignificant difference between the low-dose Simiaowan group and benzbromarone group. The expression of ABCG2 protein in the model group was lower than that in the normal group （P<0.05）. The expression of ABCG2 protein in the medium-dose and low-dose Simiaowan groups （P<0.05， P<0.01）， the high-dose Simiaowan group， and benzbromarone group increased as compared with that in the model group. ABCG2 mRNA expression was insignificantly different between the model group and the normal group， while the expression in the medium-dose and low-dose Simiaowan groups was higher than that in the model group （P<0.05）. ABCG2 protein was mainly distributed in intestinal villi， and ABCG2 protein expression demonstrated no significant difference between the model group and the normal group. The ABCG2 protein expression in the three Simiaowan groups increased as compared with that in the model group （P<0.05）. ConclusionSimiaowan can significantly reduce the serum uric acid level in hyperuricemia rats. Particularly， the low-dose Simiaowan shows similar efficacy to benzbromarone in lowering uric acid and protects renal function. The mechanism is the likelihood that it up-regulates intestinal ABCG2 expression to promote intestinal excretion of uric acid.

With the widespread use of mobile phones, laptops, and WIFI, the effects of radio frequency radiation (RFR) on human health are of increasing concern, and there are particular concerns about its reproductive toxicity. Studies have shown that the reproductive system is a sensitive target for RFR. In males, RFR is associated with decreased sperm quality and serum testosterone levels, but there are few studies on the biological effects of RFR by altering physical parameters on the male reproductive system. This paper introduced common sources of RFR, reviewed the toxic effects and mechanisms of RFR targeting male reproductive system from the aspects of spermatogenic cells, sperm structure, blood-testicular barrier, and testicular function, and analyzed male reproductive system related toxic effects of RFR by varying physical parameters including frequency, treatment duration, and specific absorption rate, so as to provide a theoretical basis and scientific basis for the safe and reasonable use of radio frequency electromagnetic field by humans and subsequent in-depth research.

Cerium oxide nanoparticles (CeO₂ NPs), as the oxides of the most abundant elements in rare earths, have been widely used in biomedical and industrial production and other fields that are closely related to human life. China is a large country in resources and production of rare earth, and the impact of CeO₂ NPs on human health has been increasingly concerned. In response to the possible health risks of CeO₂ NPs, researchers begin to focus on their toxic effects on living organisms, especially on the reproductive system. The male reproductive system is not only responsible for producing sperm and regulating the secretion of testosterone, but also plays a key role in maintaining male sexual characters and function. Any adverse effects on the male reproductive system may lead to reduced fertility and reproductive dysfunction. Some studies have shown that long-term exposure to CeO₂ NPs may lead to gonadal damage, sex hormone disorders, and other problems in male animals. Therefore, an in-depth study of the potential effects of CeO₂ NPs on the male reproductive system is of great scientific significance and practical value. In this study, we reviewed the male reproductive toxicity of CeO₂ NPs in terms of spermatogenic cells, spermatozoa structure, blood-testis barrier, hypothalamic-pituitary-gonadal axis, and functional changes in epididymis, and analyzed the effects of the size and shape of physicochemical parameters of CeO₂ NPs on the toxicity to male reproductive system. The findings will provide a theoretical basis and scientific evidence for the rational use of CeO₂ NPs.

Objective To explore the impact of severe weather on road traffic injuries (RTIs). Methods Relevant literature on the impact of meteorology on the occurrence and resulting casualties of road traffic injuries was searched. Meta-analysis was performed on the included literature using state16.0 software. Results A total of 28 articles were included. The results of meta-analysis showed that heat wave, cloudy day, snowy day, rainy day and other severe weather such as storm had a statistically significant impact on the occurrence of road traffic injuries. Severe weather such as storms had a statistically significant impact on RTIs casualties. Conclusion Heat wave, cloudy day, snowy day, rainy day, storm and other bad weather are independent risk factors for the occurrence of RTIs. Storm is a risk factor for accident casualties. There is not enough evidence to show that low temperature, cold wave and heavy fog are the influencing factors of road traffic accidents.

Mutations or inactivation of parkin, an E3 ubiquitin ligase, are associated with familial form or sporadic Parkinson's disease (PD), respectively, which manifested with the selective vulnerability of neuronal cells in substantia nigra (SN) and striatum (STR) regions. However, the underlying molecular mechanism linking parkin with the etiology of PD remains elusive. Here we report that p62, a critical regulator for protein quality control, inclusion body formation, selective autophagy and diverse signaling pathways, is a new substrate of parkin. P62 levels were increased in the SN and STR regions, but not in other brain regions in parkin knockout mice. Parkin directly interacts with and ubiquitinates p62 at the K13 to promote proteasomal degradation of p62 even in the absence of ATG5. Pathogenic mutations, knockdown of parkin or mutation of p62 at K13 prevented the degradation of p62. We further showed that parkin deficiency mice have pronounced loss of tyrosine hydroxylase positive neurons and have worse performance in motor test when treated with 6-hydroxydopamine hydrochloride in aged mice. These results suggest that, in addition to their critical role in regulating autophagy, p62 are subjected to parkin mediated proteasomal degradation and implicate that the dysregulation of parkin/p62 axis may involve in the selective vulnerability of neuronal cells during the onset of PD pathogenesis.
Adaptor Proteins, Signal Transducing ; chemistry ; metabolism ; Animals ; HEK293 Cells ; Heat-Shock Proteins ; chemistry ; metabolism ; Humans ; Lysine ; metabolism ; Mice ; Neurons ; metabolism ; pathology ; Oxidopamine ; pharmacology ; Parkinson Disease ; metabolism ; pathology ; Proteasome Endopeptidase Complex ; metabolism ; Protein Stability ; Proteolysis ; drug effects ; Sequestosome-1 Protein ; Ubiquitin-Protein Ligases ; metabolism ; Ubiquitination ; drug effects