Research progress in mechanism of nervous system injury induced by environmental PM2.5 / 中国药理学与毒理学杂志

Ambient fine particulate matter (PM2.5) refers to particulate matter whose aerodynamic diameter is less than or equal to 2.5 μm in the environment. Its composition is complex, its particle size is small and its quantity is large. PM2.5can reach the alveoli, deposit with breath, and even infiltrate into the circulatory system, thus causing corresponding pathological changes. Epidemiological study has showed that PM2.5exposure could increase the risk of neurodegenerative diseases. This review discusses the molecular mechanism of central nervous system dysfunction induced by ambient PM2.5, including neuroinflammatory response, oxidative stress, cellular apoptosis and autophagy, DNA damage and methylation.

Effect of perioperative and postoperative chemotherapy on the prognosis of patients with advanced gastric carcinoma after resection / 中国实用外科杂志

OBJECTIVE: To explore the effect of perioperative and postoperative chemotherapy on the prognosis of patients with advanced gastric cancer after resection. METHODS: From January 2004 to December 2016, a retrospective cohort of 277 stage IV gastric cancer patients after surgical treatment of gastric resection was enrolled in Department of General Surgery,Nanfang Hospital, Southern Medical University. Among them, 228 underwent surgical resection combined with postoperative adjuvant chemotherapy(postoperative chemotherapy group, group A), and preoperative chemotherapy plus surgery resection and postoperative chemotherapy in 49 cases(perioperative chemotherapy group, group B). After generating propensity scores with eight covariates, including gender, age, biological classifications, completion of chemotherapy, depth of tumor infiltration, lymph nodemetastasis, the extent of lymph nodes dissection and type of gastrectomy, 49 patients in group A were one-to-one matched with 49 patients in group B. Kaplan-merier method was used for survival analysis, and Cox proportional risk regression model was used to analyze independent survival risk factors of patients with advanced gastric cancer undergoing surgical resection. RESULTS: Before propensity scores matching(PSM), biological classifications(P<0.001),the completion of chemotherapy(P<0.001), depth of tumor infiltration(P<0.001), lymph node metastasis(P=0.049), the extent of lymphnode dissection(P=0.001) and the type of gastrectomy(P=0.001) significantly differed between two groups. While after PSM, only the completion of chemotherapy were vital different between two groups. After PSM,median survival time of group A and B were 16(95% CI 10.36-21.64) vs 29(95% CI 17.24-40.76) months, which showed not significant difference(P=0.191). The univariate analysis showed that biological classifications, the completion of chemotherapy, lymph node metastasis and the extent of lymphnode dissection were survival prognosis factors. And the multivariate analysis showed that the chemotherapy cycles≤ 2 cycles, lymph node metastasis and the extent of lymphadenectomyless than D2 were independent poor prognostic factors for advanced gastric cancer patients performed with gastrectomy. Notably, the order of chemotherapy and surgery was not independent variate of prognosis(perioperative chemotherapy vs. postoperative chemotherapy: HR 0.986,95%CI 0.539-1.806,P=0.964). CONCLUSION: Perioperative chemotherapy is not the independent variable to improve prognosis of resected advanced gastric cancer patients.Nonetheless, perioperative chemotherapy could benefit patient's chemotherapy tolerance and compliance, which could be attributed to the superiority in survival compared to postoperative chemotherapy. The finding could offer reference and guidance for further design of perspective studies for advanced gastric cancer patients.

Analysis of risk factors and intervention measures of esophagojejunal anastomotic leakage in gastric cancer patients after laparoscopic total gastrectomy / 中国实用外科杂志

OBJECTIVE: To identify the risk factors of esophagojejunal anastomotic leakage and its intervention measures of gastric cancer patients after laparoscopic total gastrectomy. METHODS: The clinical and follow-up data of 440 gastric cancer patients who underwent laparoscopic total gastrectomy with negative margins at the Department of General Surgery, Nanfang Hospital of Southern Medical University from April 2006 to December 2016 were analyzed retrospectively. Risk factors of esophagojejunal anastomotic leakage and intervention measures of patients were analyzed respectively. RESULTS: Esophagojejunal anastomotic leakage occurred in 12 of 440 patients(2.7%). The leakage was diagnosed at a median of 4(range,1 to 8) days after surgery. Univariate analysis showed that gender, age, neoadjuvant chemotherapy, anastomosis method, combined organ resection, invasion of the esophagus were risk factors affecting esophagojejunal anastomotic leakage after laparoscopic total gastrectomy, with statistically significant differences(P<0.05). Multivariate analysis showed that age, neoadjuvant chemotherapy, anastomosis method, combined organ resection,invasion of the esophagus were independent risk factors affecting esophagojejunal anastomotic leakage after laparoscopic total gastrectomy, with statistically significant differences(P<0.05). CONCLUSION: For the elderly patients, who are older than 65 years old, received neoadjuvant chemotherapy, had tumor invasion of the esophagus, undergone total laparoscopic anastomosis, combined organ resection, when they are treating with laparoscopic total gastrectomy, esophagojejunal anastomosis should be careful about. Esophagojejunal anastomotic leakage can be treated effectively with self-expanding metalstents, but the risk of migration still exists.

Effects of combining tumor necrosis factor related apoptosis-inducing ligand with PI3-K-Akt inhibition on nasopharyngeal carcinoma cell / 中华耳鼻咽喉头颈外科杂志

<p><b>OBJECTIVE</b>To study the effects of combinative therapy of tumor necrosis factor related apoptosis-inducing ligand (TRAIL) and PI3-K-Akt inhibitor on the growth and apoptosis of nasopharyngeal carcinoma (NPC) cells and underlying mechanisms.</p><p><b>METHODS</b>With cell growth assay, flow cytometric analysis and Western blotting, the effects of TRAIL and PI3-K-Akt special inhibitor (LY294002) on cell growth, apoptosis and related proteins expressions in CNE-2 cell lines were studied.</p><p><b>RESULTS</b>When concentrate of TRAIL>1 ng/ml, viability rate of cells in combinative treatment group with TRAIL and LY294002 was higher than that in the single treatment group with TRAIL (all P<0.05). When concentrate of TRAIL were 10 ng/ml and 100 ng/ml, the combinative treatment induced CNE-2 apoptosis more obviously than single treatments (t were 7.167 and 7.206, all P<0.05). The combination group showed more cleavage of Caspase-8, Caspase-3, Caspase-9 than single treatment groups.</p><p><b>CONCLUSIONS</b>Combinative application of TRAIL and PI3-K-Akt pathway inhibitor inhibits the growth of CNE-2 and induces apoptosis. The mitochondrial dependent pathway is implicated for the underlying mechanism.</p>

Projecting from the superior olivary complex to the inner ear in the cat: a retrograde fluorescent labelling study / 中华耳鼻咽喉头颈外科杂志

<p><b>OBJECTIVE</b>To investigate the distribution and projective feature of cat olivocochlear neurons.</p><p><b>METHODS</b>Eleven adult cats were divided into two groups randomly. The experimental group of eight cats was injected of 1% cholera toxin B (CTB) to the left cochlea, while injected of 5% fluoro gold (FG) to the right cochlea. The control group of three cats was injected of saline to bilateral cochlea. After a survival time of 7 days, serial frozen sections were cut in the cat brainstem. All the sections were processed by immunofluorescent procedure for CTB and FG, and the labeled olivocochlear neurons were observed by fluorescent microscope.</p><p><b>RESULTS</b>In the experimental group, the mean total of olivocochlear neurons labeled by CTB and FG was 3210 +/- 168, including lateral olivocochlear neurons (LOC, 2298 +/- 120) and medial olivocochlear neurons (MOC, 913 +/- 64). The labeled neurons were divided into three different types according to their feature of projection: neurons which only projected to the ipsilateral cochlea, neurons which only projected to the contralateral cochlea, and double-labeled neurons which projected both to the ipsilateral and contralateral cochlea, but the double-labeled neurons comprised 3.9% and 15.1% in the LOC and MOC system respectively. No labeled neurons were found in the control group.</p><p><b>CONCLUSIONS</b>There are three types of neurons in the cat olivocochlear system. The neurons which projected to the bilateral cochlea may distribute both in the LOC and MOC system.</p>