[Research on the effect of training program based on service-oriented leadership theory on nurses' job burnout].

Objective: To explore the effect of training program based on service-oriented leadership theory on alleviating the degree of job burnout of clinical nurses, and provide reference for improving the situation of job burnout of nurses. Methods: From January to December 2023, 10 head nurses of a Grade A general hospital were selected by random number table method for training, and 5 nurses were selected from the department of each head nurse by random number table method, a total of 50 nurses were selected as research objects. Through the training program based on the service-oriented leadership theory, the selected head nurses were trained on the service-oriented leadership theory, job burnout and burnout mitigation methods and passed the examination. The training period was 2 months. The general data of 50 nurses were collected, and the job burnout of nurses was investigated by using the Maslach Burnout Inventory before and 6 months after the training of head nurses, and the changes of scores of each dimension were compared by paired t-test. Results: The nurses were (30.4±5.5) years old and their working life was (8.1±6.1) years. The total detection rate of job burnout before training was 100% (50/50), the detection rate of moderate to severe emotional exhaustion was 60% (30/50), and the detection rate after training was 36% (18/50). The detection rate of moderate to severe depersonalization was 72% (36/50) and 40% (20/50) after training. The detection rate of moderate to severe lack of job accomplishment was 86% (43/50) and 54% (27/50) after training. After 6 months of head nurses training, the scores of emotional exhaustion and depersonalization of nurses were significantly lower than those before training, while the scores of personal achievement were significantly higher than those before training, with statistical significances (P<0.05) . Conclusion: The training program based on service-oriented leadership theory can scientifically prevent and alleviate nurses' job burnout after receiving training of administrators, which is helpful to improve the current situation of nurses' job burnout and reduce the degree of nurses' job burnout, and can play a positive role in promoting nurses' physical and mental health.

[Management of complex renal stones by a novel ureterorenoscope with vacuum suctioning system combined with flexible ureteroscope].

Objective: To evaluate the feasibility and safety of Sotn ureterorenoscope combined with flexible ureteroscope on managing complex renal stones. Methods: Patients treated with the Sotn ureterorenoscope combined with flexible ureteroscope between January 2010 and December 2019 were employed from the Sun Yat-sen Memorial Hospital of Sun Yat-sen University and Jiangmen Wuyi Traditional Chinese Medicine Hospital. The patients' information of age, gender, comorbidities, stone characteristics (stone size, hounsfield units, stone composition, stone location, etc.), operative time and console time, stone-free rate (SFR), and perioperative complication rate were collected. The primary outcome was defined as primary SFR in 1 month of operation, and the secondary outcome was the perioperative complication rate. The differences in preoperative and postoperative data between patients with different kinds of stones were compared. Results: A total of 347 patients were included in the study, with 220 males and 127 females. The age [M(Q1,Q3)] was 51 (42, 58) years. There were 94 patients suffered from multiple renal stones and 253 patients with staghorn renal stones. The operative time and console time age [M(Q1,Q3)] for all patients were 87 (55, 115) min and 59 (27, 75) min, respectively. The primary SFR was 81.3% [83.8% for multiple renal stones and 74.5% for staghorn renal stones (P=0.048)]. Complications occurred in 80 patients (23.1%), of which 79 cases were classified as Clavien-Dindo grade 1-2, and 1 case (0.3%) was grade 3-4. For patients with multiple renal stone, compared with the residual stone group, the complete stone-free group had smaller stone size [15.5 (12.0, 21.0) vs 22.0 (17.5, 28.1) mm, P<0.001], and lower hounsfield units [920.0 (658.0, 1 172.5) vs 1 125.0 (944.9, 1 247.5), P=0.022]. Patients with complications had longer operative time than those without complications [60.0 (38.5, 90.0) vs 75.0 (51.3, 110.0) min, P=0.022]. The SFR was higher in patients with stones size ≤ 20 mm compared to those with stones size > 20 mm (91.8% vs 67.5%, P<0.001), while the difference in complication rate was not statistically significant (P>0.05). In the staghorn renal stones group, compared with the residual stone group, the complete stone-free group had smaller stone size [35.0 (25.8, 45.3) vs 53.5 (39.3, 67.5) mm, P<0.001]. Patients with complications had larger stone size than those without complications [43.5 (34.8, 56.5) vs 36.0 (27.0, 50.0) mm, P=0.007]. Patients with stone size ≤ 40 mm had higher SFR (87.5% vs 55.3%, P<0.001) and lower complication rate(10.7% vs 31.6%, P=0.012) compared to those with stone size >40 mm. Conclusion: Sotn ureterorenoscope combined with flexible ureteroscope is an effective and safe choice for the treatment of complex renal calculi.

Proteomics of neurodegenerative diseases: analysis of human post-mortem brain.

Dementias are prevalent brain disorders in the aged population. Dementias pose major socio-medical burden, but currently there is no cure available. Novel proteomics approaches hold promise to identify alterations of the brain proteome that could provide clues on disease etiology, and identify candidate proteins to develop further as a biomarker. In this review, we focus on recent proteomics findings from brains affected with Alzheimer's Disease, Parkinson Disease Dementia, Frontotemporal Dementia, and Amyotrophic Lateral Sclerosis. These studies confirmed known cellular changes, and in addition identified novel proteins that may underlie distinct aspects of the diseases. This article is part of the special issue "Proteomics".

HBsAg may reappear following reactivation in individuals with spontaneous HBsAg seroclearance 8 years previously.

HBsAg reappearance may constitute not only a risk for liver disease but also an infectious source. We aimed to determine whether HBsAg may reappear after spontaneous HBsAg seroclearance. A cohort of 2999 HBsAg-positive subjects aged 30-55 years was recruited in Guangxi, China in 2004. HBsAg was tested every 6 months from July 2004 to June 2007, then, one more time in December 2013. The results showed that spontaneous HBsAg seroclearance occurred in 41 subjects in the first 3 years, giving a 0·54% annual seroclearance rate. Thirteen of the 41 subjects were randomly tested for HBsAg in 2013. Four subjects became HBsAg positive. S gene sequences of HBV were analysed from serum collected before seroclearance and after reappearance, respectively, for subject QS840 (11 and 12 clones), subject TN98 (13 and 13 clones) and subject WX227 (10 and 8 clones). Serotype, subgenotype and amino-acid substitution pattern in each sample collected after reappearance was observed in the sample collected before HBsAg seroclearance. Nucleotide similarity between the two sequences from each subject was >99% and five sequences from subject TN98 were the same. In conclusion, following reactivation, HBsAg may reappear in individuals with spontaneous HBsAg seroclearance many years previously.

HCN channels are a novel therapeutic target for cognitive dysfunction in Neurofibromatosis type 1.

Cognitive impairments are a major clinical feature of the common neurogenetic disease neurofibromatosis type 1 (NF1). Previous studies have demonstrated that increased neuronal inhibition underlies the learning deficits in NF1, however, the molecular mechanism underlying this cell-type specificity has remained unknown. Here, we identify an interneuron-specific attenuation of hyperpolarization-activated cyclic nucleotide-gated (HCN) current as the cause for increased inhibition in Nf1 mutants. Mechanistically, we demonstrate that HCN1 is a novel NF1-interacting protein for which loss of NF1 results in a concomitant increase of interneuron excitability. Furthermore, the HCN channel agonist lamotrigine rescued the electrophysiological and cognitive deficits in two independent Nf1 mouse models, thereby establishing the importance of HCN channel dysfunction in NF1. Together, our results provide detailed mechanistic insights into the pathophysiology of NF1-associated cognitive defects, and identify a novel target for clinical drug development.

CCHCR1 interacts with EDC4, suggesting its localization in P-bodies.

Coiled-coil alpha-helical rod protein 1 (CCHCR1) is suggested as a candidate biomarker for psoriasis for more than a decade but its function remains poorly understood because of the inconsistent findings in the literature. CCHCR1 protein is suggested to be localized in the cytoplasm, nucleus, mitochondria, or centrosome and to regulate various cellular functions, including steroidogenesis, proliferation, differentiation, and cytoskeleton organization. In this study, we attempted to find a consensus between these findings by identifying the interaction partners of CCHCR1 using co-immunoprecipiation with a stable cell line expressing EGFP-tagged CCHCR1. Out of more than 100 co-immunoprecipitants identified by liquid chromatography-tandem mass spectrometry (LC-MS/MS), the enhancer of mRNA-decapping protein 4 (EDC4), which is a processing body (P-body) component, was particularly found to be the major interacting partner of CCHCR1. Confocal imaging confirmed the localization of CCHCR1 in P-bodies and its N-terminus is required for this subcellular localization, suggesting that CCHCR1 is a novel P-body component. As P-bodies are the site for mRNA metabolism, our findings provide a molecular basis for the function of CCHCR1, any disruption of which may affect the transcriptome of the cell, and causing abnormal cell functions.

The effects of an oral preparation containing hyaluronic acid (Oralvisc®) on obese knee osteoarthritis patients determined by pain, function, bradykinin, leptin, inflammatory cytokines, and heavy water analyses.

The purpose of this study was to determine the effects of an oral preparation containing hyaluronic acid on osteoarthritic knee joint pain and function as well as changes in inflammatory cytokines, bradykinin, and leptin. We also used heavy water to determine the turnover rates of glycosaminoglycans in synovial fluid. This was a double-blind, randomized, placebo-controlled study of 40 subjects over a period of 3 months. Visual analog scale, Western Ontario McMaster pain, and WOMAC function scores were recorded. Serum and synovial fluid were measured by enzyme-linked immunosorbent assays for inflammatory cytokines, bradykinin, and leptin. In 20 subjects, terminal heavy water ingestion was used for spectral analyses of serum and joint fluid samples. There were statistically significant improvements in pain and function. Both serum and synovial fluid samples showed significant decreases for a majority of inflammatory cytokines, leptin, and bradykinin in the oral hyaluronic acid preparation group. Heavy water analyses revealed a significant decrease in hyaluronic acid turnover in the synovial fluid of the treatment group. A preparation containing hyaluronic acid and other glycosaminoglycans holds promise for a safe and effective agent for the treatment for patients with knee osteoarthritis and who are overweight. Further studies will be required to see whether this is a disease-modifying agent.

Higher order Arabidopsis 14-3-3 mutants show 14-3-3 involvement in primary root growth both under control and abiotic stress conditions.

Arabidopsis 14-3-3 proteins are a family of conserved proteins that interact with numerous partner proteins in a phospho-specific manner, and can affect the target proteins in a number of ways; e.g. modification of enzymatic activity. We isolated T-DNA insertion lines in six 14-3-3 genes within the non-epsilon group that phylogenetically group in three closely related gene pairs. In total, 6 single, 3 double, 12 triple, and 3 quadruple mutants were generated. The mutants were phenotyped for primary root growth on control plates: single and double mutants were indistinguishable from WT, whereas six triples and all quadruples showed a shorter primary root. In addition, length of the first epidermal cell with a visible root hair bulge (LEH) was used to determine primary root elongation on medium containing mannitol and 1-aminocyclopropane-1-carboxylic acid (ACC). This analysis showed clear differences depending on the stress and 14-3-3 gene combinations. Next to the phenotypic growth analyses, a 14-3-3 pull-down assay on roots treated with and without mannitol showed that mannitol stress strongly affects the 14-3-3 interactome. In conclusion, we show gene specificity and functional redundancy among 14-3-3 proteins in primary root elongation under control and under abiotic stress conditions and changes in the 14-3-3 interactome during the onset of stress adaptation.

First Report of Black Stem of Avicennia marina Caused by Fusarium equiseti in China.

Avicennia marina is a pioneer species of mangroves, a woody plant community that periodically emerges in the intertidal zone of estuarine regions in tropical and subtropical regions. In February 2013, a new disease that caused the stems of A. marina to blacken and die was found in Techeng Island of Zhanjiang, Guangdong Province, China. Initial symptoms of the disease were water-soaked brown spots on the biennial stems that coalesced so whole stems browned, twigs and branches withered, leaves defoliated, and finally trees died. This disease has the potential to threaten the ecology of the local A. marina community. From February to May 2013, 11 symptomatic trees were collected in three locations on the island and the pathogen was isolated as followed: tissues were surface disinfected with 75% ethanol solution (v/v) for 20 s, soaked in 0.1% mercuric chloride solution for 45 s, rinsed with sterilized water three times, dried, placed on potato dextrose agar (PDA), and incubated for 3 to 5 days at 28°C without light. Five isolates (KW1 to KW5) with different morphological characteristics were obtained, and pathogenic tests were done according Koch's postulates. Fresh wounds were made with a sterile needle on healthy biennial stems of A. marina, and mycelial plugs of each isolate were applied and covered with a piece of wet cotton to maintain moisture. All treated plants were incubated at room temperature. Similar symptoms of black stem were observed only on the stems inoculated the isolate KW5 after 35 days, while the control and all stems inoculated with the other isolates remained symptomless. An isolate similar to KW5 was re-isolated from the affected materials. The pathogenic test was repeated three times with the same conditions and it was confirmed that KW5 was the pathogen causing the black stem of A. marina. Hyphal tips of KW5 were transferred to PDA medium in petri dishes for morphological observation. After 48 to 72 h, white, orange, or brown flocculence patches of KW5 mycelium, 5.0 to 6.0 cm in diameter, grew. Tapering and spindle falciform macroconidia (11 to 17.3 µm long × 1.5 to 2.5 µm wide) with an obviously swelled central cell and narrow strips of apical cells and distinctive foot cells were visible under the optical microscope. The conidiogenous cells were intertwined with mycelia and the chlamydospores were globose and formed in clusters. These morphological characteristics of the isolate KW5 are characteristic of Fusarium equiseti (1). For molecular identification, the ITS of ribosomal DNA, ß-tubulin, and EF-1α genes were amplified using the ITS4/ITS5 (5), T1/T2 (2), and EF1/EF2 (3) primer pairs. These sequences were deposited in GenBank (KF515650 for the ITS region; KF747330 for ß-tubulin region, and KF747331 for EF-1α region) and showed 98 to 99% identity to F. equiseti strains (HQ332532 for ITS region, JX241676 for ß-tubulin gene, and GQ505666 for EF-1α region). According to both morphological and sequences analysis, the pathogen of the black stem of A. marina was identified as F. equiseti. Similar symptoms on absorbing rootlets and trunks of A. marina had been reported in central coastal Queensland, but the pathogen was identified as Phytophthora sp. (4). Therefore, the disease reported in this paper differs from that reported in central coastal Queensland. To our knowledge, this is the first report of black stems of A. marina caused by F. equiseti in China. References: (1) J. F. Leslie and B. A. Summerell. The Fusarium Laboratory Manual, 1st ed. Wiley-Blackwell, Hoboken, NJ, 2006. (2) K. O'Donnell and E. Cigelnik. Mol. Phylogenet. Evol. 7:103, 1997. (3) K. O'Donnell et al. Proc. Natl. Acad. Sci. USA. 95:2044, 1998. (4) K. G. Pegg. Aust et al. Plant Pathol. 3:6, 1980. (5) A. W. Zhang et al. Plant Dis. 81:1143, 1997.

Comparison of transanal haemorrhoidal dearterialisation and stapled haemorrhoidopexy in management of haemorrhoidal disease: a retrospective study and literature review.

BACKGROUND: The aim of this study was to evaluate and compare transanal haemorrhoidal dearterialisation (THD) and stapled haemorrhoidopexy [also called procedure for prolapsed haemorrhoids (PPH)] in the management of haemorrhoidal disease, in terms of short-term outcomes and efficacy. METHODS: Patients presenting with symptomatic haemorrhoids were treated with THD. Patient demographics, pre-operative data, post-operative pain scores, complications, recurrence, and patient satisfaction scores were evaluated and recorded. Patients with acute thrombosed haemorrhoids, external haemorrhoids only, or other concomitant anal diseases were excluded. These data were compared with the historical data of PPH. RESULTS: Forty consecutive patients underwent THD from February 2012 to July 2013 and were compared to 37 patients who underwent PPH taken from a medical records database. There were no significant differences in terms of demographic data, type of anaesthesia, operative time, and blood loss. Length of hospital stay, time to first post-operative bowel movement, and complications were similar between the two groups. The median pain score after THD and PPH was 1.71 and 5.00, respectively, on a scale of 0-10 (10 = worst possible pain) (p = 0.000). There was a significant improvement in bleeding and prolapse scores after THD. THD patients had an earlier return to normal daily activities (3.13 vs. 6.78 days, p = 0.001) when compared with the PPH group. Upon follow-up, patients in both groups had similar satisfaction scores, and complication and recurrence rates. CONCLUSIONS: Both THD and PPH appear to be safe procedures for haemorrhoidal disease, and they appear to have similar short-term outcomes. In particular, THD seems to be associated with a lower pain score than PPH, an earlier return to normal daily activities, and similar rates of complication and recurrence.

The gender disparity of immunoreactants in lesional skin of lupus erythematosus patients.

OBJECTIVES: The immunoreactants detected by direct immunofluorescence (DIF) from the skin of patients with lupus erythematosus (LE) were related to disease subtypes and skin morphology. Male patients presented more frequently with discoid rashes and females with malar rashes. We investigated the differences in immunoreactants in skin lesions between male and female LE patients. METHODS: The DIF records of 186 LE patients were reviewed and analysed. RESULTS: Among 186 patients (133 female and 53 male), 54 had cutaneous LE (CLE) and 132 had systemic LE (SLE). In the CLE group, eight of 33 (24.2%) women were DIF+ versus nine of 21(42.9%) men (p=0.23). In the SLE group, 49 of 100 (49%) women were DIF+ versus 17 of 32 (53.1%) men (p=0.84). The p-value was 0.01 when comparing DIF incidence between female CLE and SLE patients. IgM and complement component 3 (C3) were present in 84.2% and 52.6% of DIF+female patients, respectively, and both were comparable between genders (p>0.05). However, IgG was observed only in eight of 57 female patients, and in 10 of 26 male patients (p=0.02). Among DIF+CLE patients, IgG was detected in none of the eight female versus three of nine male patients. CONCLUSIONS: Detection of immunoreactants in skin had no gender bias in CLE or SLE, but among women, it was probably lower in CLE than SLE. IgM and C3 were the most frequent immunoreactants in skin with no gender disparity, whereas IgG in female patients was lower than in males.

Association between the rs1050450 glutathione peroxidase-1 (C > T) gene variant and peripheral neuropathy in two independent samples of subjects with diabetes mellitus.

Glutathione peroxidase-1 (GPx-1) is an endogenous anti-oxidant enzyme. The T allele of the GPx-1 rs1050450 (C > T) gene variant is associated with reduced enzyme activity. Our aim was to examine the association between this gene variant and peripheral neuropathy in two cross-sectional samples of subjects with diabetes: (i) 773 Caucasian subjects were genotyped from the UCL Diabetes and Cardiovascular disease Study (UDACS) and (ii) 382 Caucasian subjects from the Ealing Diabetes Study (EDS). Peripheral neuropathy status (and oxidised-LDL [Ox-LDL:LDL] and plasma Total Ant-ioxidant Status [TAOS] in UDACS), were analysed in relation to genotype. We observed that: (i) In UDACS, the odds ratio (OR) for peripheral neuropathy in the T allele carriers compared to the CC genotype was 1.61 [1.10-2.28], p = 0.01. This remained significant after adjustment for other risk factors. Ox-LDL:LDL ratio was significantly elevated in T allele carriers (CC vs. CT/TT: 16.3 ± 2.4 v 18.0 ± 2.9 U/mmol LDL, p = 0.02). (ii) In EDS, the OR for peripheral neuropathy in the T allele carriers compared to the CC genotype was 1.95 [1.11-3.42], p = 0.02. This remained significant after adjustment for other risk factors. In conclusion, we observed a significant association between the T allele and peripheral neuropathy and LDL oxidation. This is the first paper to examine the rs1050450 variant in two samples of Caucasian subjects with diabetes. Prospective analysis of the gene variant is required in diabetic and healthy cohorts with measured plasma markers of oxidative stress to investigate the described association further.

IRS1 gene variants, dysglycaemic metabolic changes and type-2 diabetes risk.

BACKGROUND AND AIMS: A recent genome-wide association study identified rs2943641C > T, 500 kb from the insulin receptor substrate-1 gene (IRS1), as a type-2 diabetes (T2D) susceptibility locus. We aimed to replicate this association by meta-analysis and examine whether common variants within IRS1, present on the HumanCVD BeadChip, were associated with T2D risk. METHODS AND RESULTS: We genotyped rs2943641 in 2389 prevalent or incident T2D patients and 6494 controls from two prospective and three case studies based in UK and in the European Atherosclerosis Research Study-II (EARSII; n = 714). Thirty-three IRS1 variants had been genotyped in the prospective Whitehall-II study (n = 4752) using the HumanCVD BeadChip. In a fixed-effects meta-analysis of the UK study cohorts rs2943641T allele was associated with 6% lower risk of T2D (p = 0.18), with T-allele carriers having an odds ratio (OR) of 0.89 (95% confidence interval [CI]: 0.80-1.00, p = 0.056) compared to CC subjects. The T-allele was also associated with lower fasting insulin and homeostasis model assessment index of insulin resistance in Whitehall-II and with lower post-load insulin after an oral glucose tolerance test in EARSII (all p < 0.05). None of the IRS1 variants on the chip showed linkage disequilibrium with rs2943641. In silico analysis with follow-up genotyping (total n = 9313) identified that the rare allele of the IRS1 promoter variant rs6725556A > G showed association with reduced T2D risk (OR per G-allele: 0.82, 95%CI: 0.69-0.96, p = 0.015). CONCLUSIONS: We confirm the association of rs2943641T with T2D protection. There is a possible independent effect on risk of a putative IRS1 promoter variant.

Malignancy-associated chylothorax: a 20-year study of 18 patients from a single institution.

Malignancy-associated chylothorax is a rare manifestation with uncertain characteristics and clinical significance. We segregated 18 patients into malignant lymphoma (n= 11) and solid malignancy (n= 7) groups to analyse the characteristics, treatment response and prognostic value of malignancy-associated chylothorax. Diagnosis of chylothorax was confirmed by a triglyceride concentration of >110 mg/dL or by the presence of chylomicrons in the pleural effusion. Concentrations of glucose, protein and lactate dehydrogenase did not differ significantly between the malignant lymphoma and solid malignancy groups. Although not statistically significant (P= 0.25), 90.9% malignant lymphoma patients and 57.1% solid malignancy patients had exudates. The cytology diagnostic rate in the malignant lymphoma and solid malignancy groups was 20.0% and 33.3% respectively (P > 0.99). After chemotherapy, six malignant lymphoma patients achieved complete remission, with simultaneous chylothorax disappearance. The overall survival rate at 12 and 24 months in the malignant lymphoma group was 54.5% and 36.4% respectively, while that in the solid malignancy group was 35.7% and 0% respectively. Malignant lymphoma was the chief cause of chylothorax in our cohort. Effective lymphoma treatment, lacking supplementary interventions, is essential for treating chylothorax in malignant lymphoma patients. Chylothorax indicates extremely limited life expectancy for solid malignancy patients.

Frequency of developmental dysplasia of the hip in breech-presented Chinese neonates in Hong Kong.

OBJECTIVES. To clarify the use of ultrasonography by determining the frequency of developmental dysplasia of the hip among breech-presented Chinese neonates in Hong Kong. DESIGN. Prospective case series. SETTING. Regional hospital, Hong Kong. PATIENTS. All breech-presented Chinese neonates born during January 2008 to June 2009 were included (except premature neonates). They were examined clinically from birth till the age of 1 year. Ultrasound of the hips was performed at the age of 2 weeks, and X-ray of the pelvis at the age of 1 year. RESULTS. A total of 209 breech-presented neonates were born during the study period; 110 neonates completed all necessary investigations and follow-up. Among the latter, there were three neonates with developmental dysplasia of the hip warranting treatment, which amounted to a frequency of 2.7%. CONCLUSION. Developmental dysplasia of the hip among breech-presented Chinese babies is only slightly less common than in corresponding populations in other regions in the world. Since early diagnosis is important, ultrasonography screening in high-risk cases such as those with breech presentation may be useful.

Mechanism of miR-122-5p regulating the activation of PI3K-Akt-mTOR signaling pathway on the cell proliferation and apoptosis of osteosarcoma cells through targeting TP53 gene.

OBJECTIVE: To explore the regulatory mechanism of microRNA-122-5p (miR-122-5) targeting tumor protein p53 (TP53) gene to mediate PI3K-Akt-mTOR signaling pathway on the proliferation and apoptosis of osteosarcoma (OS) cells. PATIENTS AND METHODS: With the collection of osteosarcoma and normal adjacent tissues, the mRNA of miR-122-5p, TP53, PTEN, PI3K, Akt, mTOR, Bim, Bax, and Bcl-2 was detected by Quantitative Real-Time Polymerase Chain Reaction (qRT-PCR), followed by the detection of the protein expression by Western blot. The target relationship between miR-122-5p and TP53 gene was verified. The third generation osteosarcoma cells were divided into Blank group, miR-122-5p mimic negative control (NC) group, miR-122-5p mimic group, miR-122-5p inhibitor NC group, miR-122-5p inhibitor group, rapamycin group and miR-122-5p inhibitor + rapamycin group. Furthermore, 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and flow cytometry were used to detect the proliferation ability, cell cycle distribution and apoptosis of each group after transfection. RESULTS: The expression level of miR-122-5p in osteosarcoma was lower than that in normal tissues (p < 0.05), TP53, PTEN, Bim and Bax expression levels were decreased (all p < 0.05), while the expression levels of PI3K, p-PI3K, Akt, p-Akt, mTOR, p-mTOR and Bcl-2 were highly upregulated (all p < 0.05). TP53 had the lowest expression in osteosarcoma cell line U-2OS (p < 0.05), which was selected for subsequent cell experiments. TP53 was the target gene of miR-122-5p. Compared with Blank group, miR-122-5p mimic group had increased expression of miR-122-5p (all p < 0.05); besides, there were significantly increased expression of TP53, PTEN, Bim, and Bax in miR-122-5p mimic group and rapamycin group, while remarkably decreased expression of PI3K, p-PI3K, Akt, p-Akt, mTOR, p-mTOR, and Bcl-2 (all p < 0.05), accompanied by increased proportion of cells in G0/G1 phase, decreased cell proportion in S phase, increased cell apoptosis and inhibited cell proliferation (all p < 0.05). The opposite trends were found in miR-122-5p inhibitor group relative to miR-122-5p mimic group and rapamycin group (all p < 0.05). Meanwhile, no significant difference was found in miR-122-5p inhibitor+rapamycin group when compared with that in Blank group (all p > 0.05) except for significantly decreased miR-122-5p expression (p < 0.05). CONCLUSIONS: Upregulation of miR-122-5p may inhibit the proliferation and promote the apoptosis of osteosarcoma cells by inhibiting the activation of PI3K-Akt-mTOR signaling pathway, which may be related to the targeted up-regulation of TP53 expression.

Stitching the synapse: Cross-linking mass spectrometry into resolving synaptic protein interactions.

Synaptic transmission is the predominant form of communication in the brain. It requires functionally specialized molecular machineries constituted by thousands of interacting synaptic proteins. Here, we made use of recent advances in cross-linking mass spectrometry (XL-MS) in combination with biochemical and computational approaches to reveal the architecture and assembly of synaptic protein complexes from mouse brain hippocampus and cerebellum. We obtained 11,999 unique lysine-lysine cross-links, comprising connections within and between 2362 proteins. This extensive collection was the basis to identify novel protein partners, to model protein conformational dynamics, and to delineate within and between protein interactions of main synaptic constituents, such as Camk2, the AMPA-type glutamate receptor, and associated proteins. Using XL-MS, we generated a protein interaction resource that we made easily accessible via a web-based platform (http://xlink.cncr.nl) to provide new entries into exploration of all protein interactions identified.

A stable isotope method for the simultaneous measurement of matrix synthesis and cell proliferation in articular cartilage in vivo.

OBJECTIVE: Measurements of cell proliferation and matrix synthesis in cartilage explants have identified regulatory factors [e.g., interleukin-1 (IL-1)] that contribute to osteoarthritis and anabolic mediators [e.g., bone morphogenic protein-7 (BMP-7)] that may have therapeutic potential. The objective of this study was to develop a robust method for measuring cell proliferation and glycosaminoglycan synthesis in articular cartilage that could be applied in vivo. METHODS: A stable isotope-mass spectrometry approach was validated by measuring the metabolic effects of IL-1 and BMP-7 in cultures of mature and immature bovine cartilage explants. The method was also applied in vivo to quantify physiologic turnover rates of matrix and cells in the articular cartilage of normal rats. Heavy water was administered to explants in the culture medium and to rats via drinking water, and cartilage was analyzed for labeling of chondroitin sulfate (CS), hyaluronic acid (HA) and DNA. RESULTS: As expected, IL-1 inhibited the synthesis of DNA and CS in cartilage explants. However, IL-1 inhibited HA synthesis only in immature cartilage. Furthermore, BMP-7 was generally stimulatory, but immature cartilage was significantly more responsive than mature cartilage, particularly in terms of HA and DNA synthesis. In vivo, labeling of CS and DNA in normal rats for up to a year indicated half-lives of 22 and 862 days, respectively, in the joint. CONCLUSIONS: We describe a method by which deuterium from heavy water is traced into multiple metabolites from a single cartilage specimen to profile its metabolic activity. This method was demonstrated in tissue culture and rodents but may have significant clinical applications.

A comparison of the synaptic proteome in human chronic schizophrenia and rat ketamine psychosis suggest that prohibitin is involved in the synaptic pathology of schizophrenia.

Many studies in recent years suggest that schizophrenia is a synaptic disease that crucially involves a hypofunction of N-methyl-D-aspartate receptor-mediated signaling. However, at present it is unclear how these pathological processes are reflected in the protein content of the synapse. We have employed two-dimensional gel electrophoresis in conjunction with mass spectrometry to characterize and compare the synaptic proteomes of the human left dorsolateral prefrontal cortex in chronic schizophrenia and of the cerebral cortex of rats treated subchronically with ketamine. We found consistent changes in the synaptic proteomes of human schizophrenics and in rats with induced ketamine psychosis compared to controls. However, commonly regulated proteins between both groups were very limited and only prohibitin was found upregulated in both chronic schizophrenia and the rat ketamine model. Prohibitin, however, could be a new potential marker for the synaptic pathology of schizophrenia and might be causally involved in the disease process.