ABSTRACT
Objective:To investigate the effect of lncRNA SNHG6 on the proliferation and radiotherapy sensitivity of cervical cancer SiHa cells and its potential mechanism.Methods:The expression levels of lncRNA SNHG6 and miR-485-3p in cervical cancer tissues, paracancer tissues, SiHa cells and SiHa cells exposed to X-ray were detected. The relationship between lncRNA SNHG6 and miR-485-3p was analyzed. After overexpression or knockdown of SNHG6 and miR-485-3p, cell proliferation ability, number of invasion and apoptosis rate were determined by MTT, Transwell chamber assay and flow cytometry, respectively. The effect of miR-485-3p on the Wnt/β-catenin pathway and the effect of XAV939 on SiHa cell proliferation and radiation sensitivity were analyzed.Results:lncRNA SNHG6 was highly expressed in cervical cancer tissues and SiHa cells, whereas was lowly expressed in X-ray irradiated SiHa cells. miR-485-3p was lowly expressed in cervical cancer tissues and SiHa cells, whereas was highly expressed in X-ray irradiated SiHa cells. lncRNA SNHG6 targeted miR-485-3p. Down-regulation of lncRNA SNHG6 expression inhibited cell proliferation and invasion, and enhanced its sensitivity to X-ray radiotherapy, while miR-485-3p inhibitor transfected cells exerted the opposite effect. The up-regulation of lncRNA SNHG6 promoted the proliferation and invasion of SiHa cells through miR-485-3p, and reduced the sensitivity of radiotherapy. Down-regulation of miR-485-3p activated the Wnt/β-catenin pathway, promoted cell proliferation and invasion of SiHa, and reduced its radiation sensitivity to X-ray.Conclusion:Overexpression of lncRNA SNHG6 targeting miR-485-3p activates the Wnt/β-catenin pathway to regulate the proliferation and radiotherapy sensitivity of SiHa cells.
ABSTRACT
Background: The revised Atlanta classification (RAC) and determinant-based classification (DBC) are widely used in assessing the severity of acute pancreatitis (AP). However, studies on comparison between RAC and DBC are scarce. Aims: To explore the accuracy of RAC and DBC in the assessment of AP severity. Methods: The clinical data of 481 AP patients from September 2015 to September 2019 at Taizhou People's Hospital were collected and severity were stratified according to RAC and DBC. The treatment and prognosis of each subgroup were compared. Results: On the basis of RAC, 269 (55.9%), 174 (36.2%) and 38 (7.9%) patients were classified as mild AP (MAP), moderate severe AP (MSAP) and severe AP (SAP), respectively. There were significant differences in mortality, ICU monitoring rate, ICU stay, operation rate and hospital stay among the above groups (P<0.05). On the basis of DBC, 319 (66.3%), 117 (24.3%), 34 (7.1%) and 11 (2.3%) patients were classified as MAP, MSAP, SAP and critical AP (CAP), respectively. There were significant differences in mortality, ICU monitoring rate, ICU stay, operation rate and hospital stay among the above groups (P<0.05). The ICU monitoring rate (100% vs. 63.2%, P=0.014), median ICU stay (35 days vs. 15 days, P=0.001), hospital stay [(50.36±21.54) days vs. (22.78±14.56) days, P=0.038] were significantly increased in CAP patients (classified by DBC) than those in SAP patients (classified by RAC), however, no significant differences in mortality and operation rate were found between the two groups (P=0.136; P=0.202). Conclusions: Both RAC and DBC can accurately stratify the severity of AP. SAP patients (classified by RAC) complicated with infected necrosis should be further classified into CAP.
ABSTRACT
Objective: To evaluate the bone repair efficacy of the new nano-hydroxyapatite (n-HA)/polyurethane (PU) composite scaffold in the treatment of chronic osteomyelitis in tibia. Methods: A novel levofloxacin@mesoporous silica microspheres (Lev@MSNs)/n-HA/PU was successfully synthesized. Its surface structure was observed by scanning electron microscopy (SEM). Fifty adult female New Zealand rabbits were randomly selected, and osteomyelitis was induced in the right tibia of the rabbit by injecting bacterial suspension ( Staphylococcus aureus; 3×10 7 CFU/mL), which of the method was described by Norden. A total of 45 animals with the evidence of osteomyelitis were randomly divided into 4 groups, and the right medullary cavity of each animal was exposed. Animals in the blank control group (group A, n=9) were treated with exhaustive debridement only. The remaining animals were first treated by exhaustive debridement, and received implantations of 5 mg Lev@PMMA (group B, n=12), 1 mg Lev@MSNs/n-HA/PU (group C, n=12), and 5 mg Lev@MSNs/n-HA/PU (group D, n=12), respectively. At 12 weeks postoperatively, the right tibia of rabbits were observed by X-ray film, and then gross observation, methylene blue/acid fuchsin staining, and SEM observation of implant-bone interface, as well as biomechanical test (measuring the maximal compression force) were performed. Results: X-ray films showed that the infection were severer than those of preoperation in group A, while the control of inflammation and bone healing of rabbits in group D were obviously better than those at preoperation. The gross observation showed extensive bone destruction in group A, a significant gap between bone tissue and the material in groups B and C, and close combination between bone tissue and the material in group D. The histology of the resected specimens showed that there was no obvious new bone formation around the materials in groups B and C, and there was abundant new bone formation around the periphery and along the voids of the materials and active bone remodeling in group D. The SEM observation of the bone-implant interface demonstrated that no new bone formation was observed at the bone-implant interface in groups B and C. However, bony connections and blurred boundaries were observed between the material and host bone tissue in group D. The biomechanical test showed the maximal compression force of groups B and D were significantly higher than that of groups A and C ( P0.05). Conclusion: The novel synthetic composite Lev@MSNs/n-HA/PU exhibit good antibacterial activities, osteoconductivity, and biomechanical properties, and show great potential in the treatment of chronic osteomyelitis of rabbits.
ABSTRACT
Aliquat 336 functionalized chelating adsorbent derived from chitosan for enrichment and separation of Y(Ⅲ) were investigated by static adsorption method. The adsorption of Y(Ⅲ) was greatly influenced by the pH of solution, and reached maximum at 20 ℃ using 90 mg/L Y(Ⅲ) at pH 4. 9, and the adsorption of Y(Ⅲ) followed a pseudo-second-order kinetics model and the Langmuir isotherm model. The reduction of Y(Ⅲ) adsorption with the increasing of temperature meant that the adsorption process was exothermic. XPS analysis demonstrated that both cations and anions of the adsorbent were involved in adsorption process, thereby resulting in an improved adsorption of Y(Ⅲ). The adsorbent was thus efficient for enrichment and separation of rare earths from waste rare earth phosphor.
ABSTRACT
Objective To observe neural stem cells proliferation,migration and differentiation in hippocampus in developing rats with status epileptictus.Methods 320 healthy SD rats at age 7,14,21,28 d (P7,P14,P21,P28) were randomly divided into status epilepticus (SE) and normal control group.In each group those rats at the same age were further randomly divided into 1,7,14,21,28 d five time points after PTZ-induced SE (n =8).New cell proliferation and migration were observed by immunohistochemistry studies in the dentate gyms.Double labeling with Brdu/NeuN and Brdu/GFAP was performed in the P14 rats.Results Nestin positive cells appeared in the dentate gyms on 1 d after SE in P7,P14,P21,P28 rats.The number of nestin positive cells gradually increased on 7 d and reached a peak on 14 d,then gradually reduced on 21 d,finally fell to a minimum on 28 d after SE.The numbers of nestin positive cells on 7 d(177.00 ± 3.22,t =16.033) and 14 d (195.00 ± 3.41,t =28.840) were significantly higher in the SE group than the NS group (147.50 ± 2.08,136.50 ± 2.65,both P ＜ 0.05).The smaller age of rats with SE onset,the greater the nestin intensity.But the number of nestin positive cells in the dentate gyrus of normal rats were gradually decreased with increasing age.Nestin positive cells were distributed in subgranular zone of dentate gyrus on 1 d and 7 d after SE,then gradually migrated to the granule cell layer on 14 d with morphological changes.Small part of nestin positive cells were ectopically migrated to the hilus of dentate gyrus in P14,P21,P28 age rats,and were also seen in the CA1,CA3 of hippocampus and cortex with various cell morphology.For differentiation of newly generated cells,most of Brdu positive cells coexpressed NeuN and about 4％-5％ cells co-expressed GFAP.Conclusions SE could induce neurogenesis in the hippocampal dentate gyrus area in developing rats which has age-related characteristics.Most new cells migrate from the subgranular zone to the granule cell layer of the dentate gyrus,and a small number of newly generated cells ectopically migrated to the hilus of dentate.The majority of newly generated cells differentiate into neurons,and the others differentiate into glial.
ABSTRACT
Objective To study the distribution and expression of Semaphorins-3A protein in brain of postnatal rats.Methods Semaphorins-3A positive cells were observed by immunohistochemistry in the cerebral cortex,hippocampus,dentate gyms and entorhinal cortex in postnatal 0d,7d,14d,21 d and 28d of Sprague Dawley rats.Results Semaphorins-3A positive cells widely distributed in the granule cell layer ( Ⅱ ),external pyramidal cell layer ( Ⅲ ),internal granular cell layer ( Ⅳ ),pyramidal cell layer ( Ⅴ ) and layer of polymorphous cells ( Ⅵ ),in addition to the molecular layer ( Ⅰ ) of the parietal,occipital,frontal,temporal,insular,cingulate cortex,piriform cortex and entorhinal cortex with postnatal 0d,7d,14d,21d and 28d rats.The amount of semaphorins-3A positive cells(IOD) in the entorhinal cortex was 84916.23 ± 3266.34 in P0d,77711.41 ± 2634.26 in P7d,74124.25 ± 3989.09 in P14d,65887.63 ± 3406.57 in P21d and 57705.96 ± 3136.35 in P28d,meanwhile the region of semaphorins-3A positive cells narrowed in the part level with Ⅱ -Ⅵ levels of cortex.Similarly semaphorins-3A positive cells distributed mainly in granule cell layer of dentate gyrus,CA1,CA3 region and only a few of semaphorins-3A positive cells scattered in the multi-line layer in hippocampus.The expression level of semaphorins-3Awas significant difference among postnatal 0d,7d,14d,21d and 28d rats (P＜0.01).Conclusion Semaphorins-3A positive cells widely distribute in the various cortex and hippocampus in developing rat brain,and the region of semaphorins-3A is reduced with age growth of rats.
ABSTRACT
ObjectiveTo observe Semaphorins-3A and synaptophysin P38 expression in hippocampus of developing rat induced by status epilepticus.Methods 320 SD rats were divided into four groups (P7,P14,P21 and P28) according to day -old after birth (7d,14d,21d and 28d).Rats in each group were randomly divided into model group (SE group) and saline control group (NS group).SE was induced by Pentylenetetrazol (PTZ).Semaphorins-3A and synaptophysin P38 expression were determined by immunohistochemical staining on 1d,7d,14d,21d and 28d after SE in hippocampal CA1 of rats.ResultsSemaphorins-3A-positive cells could be seen in the hippocampal granule cell layer in all rats.Semaphorins-3A expression tended to decrease with the increasing of day-age,especially in P7 group(91 552.68 ± 4664.69 ).No matter how day-age,Semaphorins-3A expression was similar to that in NS group and was obvious reduced in 7d after SE(56 938.84 ± 5688.47 ).Meanwhile P38 expression in P7-day-age rats had had been gradually increasing between 1 day and 14d (5413.18 ±48.77,6223.40±29.19,6902.94 ±78.51 ) and then stabilized gradually on 21d(7523.42 ± 62.94) after rats were tested.P38 expression in other day-age rat was relatively stable on the same level in physiological state.On the other hand P38 expression in the hippocampal CA1 region of P7,P14,P21 and P28 rats was significantly higher than that in normal rats between 1day and 28day after SE episode(P＜ 0.05 ),and reached a peak on 14 day(8408.35 ± 55.73 ).ConclusionSemaphorins-3A and synaptophysin P38 involved in hippocampal synaptic plasticity of rat in developing stage and epilepsy.
ABSTRACT
Conditional forebrain-specific presenilin-1 and presenilin-2 double knockout mice (dKO mice) exhibit several neurodegenerative phenotypes of Alzheimer's disease (AD) pathology, such as tau hyperphosphorylation, neuron loss, forebrain cortical shrinkage and memory impairment. By using capillary electrophoresis assay, monoamine neurotransmitters in forebrain cortex, hippocampus and other forebrain region of dKO mice aged at 6, 9 and 12 months were measured to illustrate the relationship among presenilins function deficiency, neurodegenerative phenotypes and monoamine neurotransmitters. Data showed that levels of monoamine neurotransmitters in forebrain cortex of dKO mice were significantly decreased at 6 months when compared to controls, while as mice getting older, levels of monoamine neurotransmitters increased to that of controls, or even higher. In hippocampus, 5-hydroxytryptamin and epinephrine in dKO mice had a significant increase at 6 months, followed with a significant increase of each monoamine neurotransmitter at 12 months age. In other forebrain region, 5-hydroxytryptamin and dopamine had a similar level between control and dKO mice at 6 and 9 months but a significant decrease at 12 months; however, level of norepinephrine and epinephrine were significantly decreased at 6 and 12 months except epinephrine of 6 months. These results demonstrated that knockout of presenilins genes could lead to the variation of monoamine neurotransmitters, and the variation profiles were different among forebrain cortex, hippocampus and other forebrain region. However, whether presenilins deficiency caused the variation of monoamine neurotransmitter directly or not, and how about the effects of variation of monoamine neurotransmitters on AD-like pathology need to be further analyzed.