Objective: To investigate a SARS-CoV-2 epidemic reported in Rongcheng City, Weihai, Shandong Province. Methods: The SARS-CoV-2 nucleic acid positive patients and their close contacts were investigated, and the whole genome sequencing and genetic evolution analysis of 9 variant viruses were carried out. An infection source investigation and analysis were carried out from two sources of home and abroad, and three aspects of human, material and environment. Results: A total of 15 asymptomatic infections were reported in this epidemic, including 13 cases as employees of workshop of aquatic products processing company, with an infection rate of 21.67% (13/60). Two cases were infected people's neighbors in the same village (conjugal relation). The first six positive persons were processing workers engaged in the first process of removing squid viscera in the workshop of the company. The nucleic acid Ct value of the first time were concentrated between 15 and 29, suggesting that the virus load was high, which was suspected to be caused by one-time homologous exposure. The whole genome sequence of 9 SARS-CoV-2 strains was highly homologous, belonging to VOC/Gamma (Lineage P.1.15). No highly homologous sequences were found from previous native and imported cases in China. It was highly homologous with the six virus sequences sampled from May 5 to 26, 2021 uploaded by Chile. The infection source investigation showed that the company had used the squid raw materials captured in the ocean near Chile and Argentina from May to June 2021 over the last 14 days. Many samples of raw materials, products and their outer packages in the inventory were tested positive for nucleic acid. Conclusion: This epidemic is the first local epidemic caused by the VOC/Gamma of SARS-CoV-2 in China. It is speculated that the VOC/Gamma, which was prevalent in South America from May to June 2021, could be imported into China through frozen squid.
Humans ; SARS-CoV-2 ; COVID-19 ; Epidemics ; China/epidemiology*

Objective To investigate the expression and correlation of Runt-related transcription factor 3(RUNX3)and enhancer of zeste homolog 2(EZH2)in rectal cancer,and to reveal the relationship between the expression of RUNX3 and EZH2 and the sensitivity of XELOX regimen to neoadjuvant chemotherapy in locally advanced rectal cancer patients. Methods The carcinoma and paracancerous tissues of 31 patients with rectal adenocarcinoma and no preoperative antitumor therapy were selected as cancer group and paracancer group,respectively.The relative mRNA levels of RUNX3 and EZH2 in the two groups were measured by real-time quantitative reverse transcription-polymerase chain reaction,and the protein levels were determined by immunohistochemical assay.The expression of RUNX3 and EZH2 was compared between cancer tissue and paracancerous tissue.The pre-treatment wax blocks of 26 patients with locally advanced rectal cancer who received 3 cycles of XELOX regimen as neoadjuvant chemotherapy before surgery were selected as the pre-neoadjuvant therapy group,and the postoperative pathological wax blocks were selected as the post-neoadjuvant treatment group.Tumor regression grade(TRG)was determined to evaluate the efficacy of neoadjuvant therapy.Immunohistochemical assay was used to detect the protein levels of RUNX3 and EZH2 in the two groups,and then the relationship between the expression patterns of the two proteins and the efficacy of neoadjuvant chemotherapy was analyzed. Results Compared with paracancerous tissue,the cancer tissue showed down-regulated mRNA level and reduced positive protein expression rate of RUNX3,while up-regulated mRNA level(
Core Binding Factor Alpha 3 Subunit/genetics* ; Enhancer of Zeste Homolog 2 Protein/genetics* ; Humans ; Neoadjuvant Therapy ; Rectal Neoplasms/drug therapy* ; Transcription Factor 3

OBJECTIVE: To observe the clinical effect of elastic intramedullary nail in minimally invasive treatment of floating knee injury in children. METHODS: From January 2009 to September 2017, 11 children with floating knee injury were treated with one-off open reduction and elastic intramedullary nail or external fixator fixation, including 7 males and 4 females, aged 5.0 to 11.0 years, with an average age of 8.3 years. The treatment results were evaluated according to karlstrom's standard. RESULTS: Eleven patients were followed up for 8 to 48 months, with an average of 28 months. All the fractures healed at one time, and there were no complications such as nonunion, malunion and serious dysfunction of knee joint. The length of the affected limb in 2 cases was 1.2 to 1.5 cm longer than that in the opposite side without shortening. According to Karlstrom scoring standard, 8 cases were excellent, 1 case was good and 2 cases were middle. CONCLUSION Elastic intramedullary nail minimally invasive treatment of floating knee injury in children is a safe and effective treatment, which can effectively reduce the fracture and promote bone healing, which is conducive to early functional recovery.
Bone Nails ; Child ; Child, Preschool ; External Fixators ; Female ; Fracture Fixation ; Fracture Fixation, Intramedullary ; Fracture Healing ; Humans ; Internal Fixators ; Knee Injuries ; surgery ; Male ; Treatment Outcome

Objective: To investigate the effectiveness and adverse effects of Cyberknife stereotactic body radiotherapy (SBRT) on liver metastases from PCa. METHODS: From June 2009 to September 2016, we treated 20 cases of PCa liver metastases by Cyberknife SBRT, at a total dose of 36 (30－50) Gy, on 1－3 liver metastatic lesions, for 3－5 times, with a prescription isodose line of 70－92%. We assessed the therapeutic effect according to the modified Response Evaluation Criteria in Solid Tumors (mRECIST), calculated the survival and disease-control rates using the Kaplan-Meier method, and analyzed the adverse events based on the National Cancer Institute Common Terminology Criteria for Adverse Events－Version 4.0 (CTCAE 4.0). RESULTS: Of all the cases treated, complete response (CR) was found in 8 (40.0%), partial response (PR) in 9 (45.0%), stable disease (SD) in 2 (10.0%), and progressive disease (PD) in 1 (5.0%), with a local control rate (CR+PR) of 85.0% and a disease-control rate (CR+PR+SD) of 95.0%. Among the 14 patients with elevated PSA, 10 (71.4%) showed a significant decrease after treatment. The median follow-up time was 17 months, the 1- and 2-year survival rates were 85.0% and 15.0%, respectively, and the median survival time of the 20 patients was 16.5 months (95% CI: 12.12－22.88). Cyberknife SBRT was well tolerated in all the patients, with only a few mild adverse events (mainly grades 1 and 2 but no 4 and 5) during the whole course of treatment. CONCLUSIONS Cyberknife SBRT is safe and effective in the treatment of PCa liver metastases, with a high local control rate, and capable of reducing the PSA level and raising the long-term survival rate of the patients.

OBJECTIVE: To investigate the protective effects of procyanidin on periprosthetic osteolysis caused by tricalcium phosphate (TCP) wear particles in the mouse calvaria and its mechanism. METHODS: Forty-eight male ICR mice were randomly divided into sham group, TCP group, and procyanidin (0.2 mg/kg, 1 mg/kg, 5 mg/kg)-treated group (n=12). A periprosthetic osteolysis model in the mouse calvaria was established by implanting 30 mg of TCP wear particles onto the surface of bilateral parietal bones following removal of the periosteum. On the 2 day post-operation, procyanidin (1 mg/kg, 5 mg/kg) was locally injected to the calvaria under the periosteum every other day. After 2 weeks, all the mice were sacrificed to collect the blood samples and the calvaria. Periprosthetic osteolysis and osteoclastogenesis in the mouse calvaria were observed by tartrate resistant acid phosphatase (TRAP) staining and HE staining. mRNA levels of TRAP, capthesin K, c-Fos and NFATc1 in the periprosthestic bone tissue were examined by real-time fluorescence quantitative PCR. Serum contents of total anti-oxidation capacity (T-AOC) and MDA, and superoxide dismutase (SOD) activity were determined by chemical colorimetry. Protein expressions of autophagic biomarkers such as Beclin-1 and LC-3 in periprosthetic bone tissue of the calvaria were examined by Western blot. RESULTS: Compared with sham group, periprosthetic osteolysis, osteoclastogenesis, mRNA levels of TRAP, capthesin K, c-Fos and NFATc1, and serum MDA content were increased significantly in the TCP group (P＜0.05), whereas serum T-AOC level and SOD activity were decreased. The protein expressions of Beclin-1 and LC-3, and the conversion of LC3-II from LC3-I were both up-regulated markedly in the mouse calvaria of TCP group (P＜0.05). Compared with TCP group, osteolysis, osteoclastogenesis, mRNA levels of TRAP, capthesin K, c-Fos and NFATc1 and serum MDA content were decreased obviously in the procyanidine group (P＜0.05), serum T-AOC level and SOD activity were increased, the expressions of Beclin-1 and LC-3, and the conversion of LC3-II from LC3-I were down-regulated obviously in the mouse calvaria of procyanidin group (P＜0.05). CONCLUSION Procyanidin has a protective effect of periprosthetic osteolysis caused by TCP wear particles in the mouse calvaia, its mechanism may be mediated by inhibition of oxidative stress and autophagy.
Animals ; Autophagy ; Biflavonoids ; pharmacology ; Calcium Phosphates ; adverse effects ; Catechin ; pharmacology ; Male ; Mice ; Mice, Inbred ICR ; Osteolysis ; Oxidative Stress ; Proanthocyanidins ; pharmacology ; Prostheses and Implants ; adverse effects ; Random Allocation ; Skull

BACKGROUNDSepsis is a major cause of mortality in Intensive Care Units. Anesthetic dose isoflurane and 100% oxygen were proved to be beneficial in sepsis; however, their application in septic patients is limited because long-term hyperoxia may induce oxygen toxicity and anesthetic dose isoflurane has potential adverse consequences. This study was scheduled to find the optimal combination of isoflurane and oxygen in protecting experimental sepsis and its mechanisms.

METHODSThe effects of combined therapy with isoflurane and oxygen on lung injury and sepsis were determined in animal models of sepsis induced by cecal ligation and puncture (CLP) or intraperitoneal injection of lipopolysaccharide (LPS) or zymosan. Mouse RAW264.7 cells or human peripheral blood mononuclear cells (PBMCs) were treated by LPS to probe mechanisms. The nuclear factor kappa B (NF-κB) signaling molecules were examined by Western blot and cellular immunohistochemistry.

RESULTSThe 0.5 minimum alveolar concentration (MAC) isoflurane in 60% oxygen was the best combination of oxygen and isoflurane for reducing mortality in experimental sepsis induced by CLP, intraperitoneal injection of LPS, or zymosan. The 0.5 MAC isoflurane in 60% oxygen inhibited proinflammatory cytokines in peritoneal lavage fluids (tumor necrosis factor-alpha [TNF-β]: 149.3 vs. 229.7 pg/ml, interleukin [IL]-1β: 12.5 vs. 20.6 pg/ml, IL-6: 86.1 vs. 116.1 pg/ml, and high-mobility group protein 1 [HMGB1]: 323.7 vs. 449.3 ng/ml; all P< 0.05) and serum (TNF-β: 302.7 vs. 450.7 pg/ml, IL-1β: 51.7 vs. 96.7 pg/ml, IL-6: 390.4 vs. 722.5 pg/ml, and HMGB1: 592.2 vs. 985.4 ng/ml; all P< 0.05) in septic animals. In vitro experiments showed that the 0.5 MAC isoflurane in 60% oxygen reduced inflammatory responses in mouse RAW264.7 cells, after LPS stimulation (all P< 0.05). Suppressed activation of NF-κB pathway was also observed in mouse RAW264.7 macrophages and human PBMCs after LPS stimulation or plasma from septic patients. The 0.5 MAC isoflurane in 60% oxygen also prevented the increases of phospho-IKKβ/β, phospho-IκBβ, and phospho-p65 expressions in RAW264.7 macrophages after LPS stimulation (all P< 0.05).

CONCLUSIONCombined administration of a sedative dose of isoflurane with 60% oxygen improves survival of septic animals through reducing inflammatory responses.

Adult ; Anesthesia ; methods ; Animals ; Blotting, Western ; Bronchoalveolar Lavage Fluid ; Disease Models, Animal ; Female ; Humans ; Inflammation ; drug therapy ; Isoflurane ; therapeutic use ; Leukocytes, Mononuclear ; metabolism ; Lipopolysaccharide Receptors ; metabolism ; Lipopolysaccharides ; pharmacology ; Lung Injury ; drug therapy ; immunology ; metabolism ; Male ; Mice ; Mice, Inbred C57BL ; NF-kappa B ; metabolism ; Oxygen ; therapeutic use ; Peroxidase ; metabolism ; RAW 264.7 Cells ; Rats, Sprague-Dawley ; Sepsis ; drug therapy ; immunology ; Tumor Necrosis Factor-alpha ; metabolism

Objective To observe the effect of Hydroxysafflor yellow A (HSYA) on T lymphocytes proliferation and mitochondrial membrane injury of human peripheral blood induced by lipopolysaccharide.Methods Human T lymphocytes were isolated from peripheral blood.The T lymphocyte suspension was divided averagely into 5 groups as followings:blank control group (without any drug and cell),positive control group (lipopolysaccharides 80 μg · mL-1),low,middle,high concentration test groups (200,400,800 μmol · L-1 HSYA + lipopolysaccharides 80 μg· mL-1)-Cell counting kit-8 (CCK-8) was used to measure the proliferation of T cells,and mitochondrial membrane was measured by flow cytometry.Results The cell viability in positive control group and low,middle,high concentration test groups were 50％,63％,90％,99％.The cell viability in middle,high concentration test groups had significant difference with positive control group and low concentration test group (P ＜ 0.05).The frequency of mitochondrial membrane injury in positive control group and low,middle,high concentration test groups were 19.2％,17.3％,13.0％,10.4％,the frequency of mitochondrial membrane injury decreased the most significant in high concentration test group.Conclusion HSYA was effective in promoting the proliferation of T lymphocytes,which inhibited by lipopolysaccharides,and ameliorated lipopolysaccharides-induced mitochondrial membrane injury.Thus,HSYA might be useful as a potential therapeutic medication for treating sepsis.

Background:The Food and Drug Administration recently announced that the use of morcellation may cause fibroids or pelvic dissemination and metastasis of uterine sarcoma;therefore,the use of morcellation is limited in the USA.A large sample study is necessary to assess the proportion of uterine malignant tumors found in patients with laparoscopic myomectomy.Methods:A national multicenter study was performed in China.From 2002 to 2014,33,723 cases were retrospectively selected.We calculated the prevalence and recorded the clinical characteristics of the patients with malignancy after morcellation application.A total of 62 cases were finally pathologically confirmed as malignant postoperatively.Additionally,the medical records of the 62 patients were analyzed in details.Results:The proportion of postoperative malignancy after morcellation application was 0.18％ (62/33,723) for patients who underwent laparoscopic myomectomy.Nearly 62.9％ (39/62) of patients had demonstrated blood flow signals in the uterine fibroids before surgery.And,23 (37.1％) patients showed rapid growth at the final preoperative ultrasound.With respect to the pathological types,38 (61.3％) patients had detectable endometrial stromal sarcoma,13 (21.0％) had detectable uterine leiomyosarcoma,only 3 (3.2％) had detectable carcinosarcoma,and 5 (8.1％) patients with leiomyoma had an undetermined malignant potential.Conclusions:The proportion of malignancy is low after using morcellation in patients who undergo laparoscopic myomectomy.Patients with fast-growing uterine fibroids and abnormal ultrasonic tumor blood flow should be considered for malignant potential,and morcellation should be avoided.

OBJECTIVETo construct recombinant lentiviral vectors carrying Rheb gene and its mutant Rheb'D60K gene, and examine their expression in human liver cancer cells.

METHODSRheb gene was amplified by PCR to construct the recombinant plasmid LV31-Rheb-WT and LV31-Rheb-D60K. HEK-293 FT cells were contransfected with the recombinant lentiviral vector together with a lentiviral package plasmid to produce the lentiviral particles. The expression of PS6 protein was detected in the lentivirus-infected MCF-7 cells. The apoptosis of SK-HEP-1 cells transfected with LV31-Rheb-WT or LV31-Rheb-D60K was observed.

RESULTSThe recombinant LV31-Rheb-WT and LV31-Rheb-D60K vectors were confirmed by PCR and DNA sequencing. Western blotting showed that PS6 protein expression was increased in LV31-Rheb-WT-transfected cells while decreased in LV31-Rheb-D60K-transfected cells. LV31-Rheb-D60K-transfected SK-HEP-1 cells showed more obvious apoptosis after starvation than LV31-Rheb-WT-transfected cells.

CONCLUSIONLentiviral vectors carrying Rheb gene and its mutant has been successfully constructed, which can be useful in further investigation of the role of Rheb gene in cancer cells.

Apoptosis ; genetics ; Carcinoma, Hepatocellular ; metabolism ; pathology ; Genetic Vectors ; genetics ; HEK293 Cells ; Humans ; Lentivirus ; genetics ; metabolism ; Liver Neoplasms ; metabolism ; pathology ; MCF-7 Cells ; Monomeric GTP-Binding Proteins ; biosynthesis ; genetics ; Mutant Proteins ; genetics ; Neuropeptides ; biosynthesis ; genetics ; Ras Homolog Enriched in Brain Protein ; Recombinant Proteins ; biosynthesis ; genetics ; Transfection

Background The development of retinopathy of prematurity(ROP) is associated with many regulatory cytokines related to neovascularization;however,the retinal expression and regulated mechanism of stromal cell-derived factor-1 (SDF-1) in mouse model of oxygen-induced retinopathy (OIR) remain uncertain.Objective This study was to investigate the expression of SDF-1 in retina of mouse model of OIR.Methods Forty 7-day-old C57BL/6J mice were divided into OIR group and control group.In OIR group,20 mice were exposed to 75% oxygen for 5 days and then to room air for 5 days.In control group,20 mice were raised in room air.The expression of SDF-1 in retina of mice was studied by immunochemistry and quantified by real time reverse transcriptase polymerase chain reaction (RT-PCR).Results The positive immunohistochemical staining for SDF-1 was found mainly locating at the ganglion cell layer in 12-day-old mice of OIR group;the stronger positive immunohistochemical staining for SDF-1 was noted mainly locating at the ganglion cell layer,vascular endothelial cells of inner retina,neovascular endothelial cells in 17-day-old mice of OIR group;the delicate positive immunohistochemical staining for SDF-1 was both found mainly locating at the inner retina and being around the retinal vascular in 12-day-old mice of control group and 17-day-old mice of control group.The expression of SDF-1 mRNA in 17-day-old mice of OIR group was higher than that of 12-day-old mice of OIR group (t=8.072,P＜0.05)and 17-day-old mice of control group(t=10.026,P＜0.05),respectively.The expression of SDF-1 mRNA in 12-day-old mice of OIR group was lower than that of 12-day-old mice of control group (t=4.336,P＜0.05).Conclusion SDF-1 might improve the onset of retinal neovascularization of OIR.