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Objective To observe the effects of neurotrophin 3 (NT3)-chitosan on motor function, and proliferation and differentiation of the neural stem cells (NSCs) in the injury area and subventricular zone (SVZ) in rats with motor cortex injury. Methods Sixty-five Wistar rats were divided into control group (n=7), injury group (n=29) and NT3-chitosan group (n=29). The motor cortex was aspirated and re-moved as cerebral injury model. NT3-chitosan was immediately implanted into the injured area after operation, and the control group re-ceived no intervention. Pellet reaching test was performed to detect the recovery of the forelimb function, HE staining was used to observe the lesion cavity size, and immunofluorescence staining was used to observe the proliferation and differentiation of NSCs 3 days, 7 days, 14 days, 1 month, 2 months and 3 months after operation. Results The grasp success rate was higher (F>6.00, P≤0.05), and the lesion cavity size was significantly smaller (F>629.5, P171.43, P155.06, P<0.001), the number of Dcx positive cells was significantly higher in the NT3-chitosan group than in the injury group (F=62.367, P<0.001), and the number of BrdU/Dcx positive cells was significantly higher in the NT3-chitosan group than in the control group (F=33.527, P<0.001). Conclusion NT3-chitosan could activate NSCs in the SVZ, and pro-mote endogenous neurogenesis and forelimb function recovery in rats after motor cortex injury.
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Objective · To explore the clinical application value of hysteroscopic transcervical resection of endometrium (TCRE) combined with levonorgestrel-releasing intrauterine system (Mirena) in the treatment of adenomyosis. Methods · A total of 112 cases of adenomyosis patients were divided randomly into the combination group and Mirena group. The combination group (56 cases) was treated by TCRE endometrium endometrial resection, assisted Mirena treatment after operation. Mirena group (56 cases) was treated by Mirena only. The follow-up lasted 36 months after treatment, including measures of the volumes of menstrual bleeding, hemoglobin levels, dysmenorrhea scores, uterine volume, serum CA125 levels and incidences of complications.Results · The median follow-up duration was 42 months, and the three-year follow-up rate was 73.21% for the combination group and 50% for the Mirena group. After surgery, the volumes of menstrual bleeding of patients in 3-36 months decreased significantly, with an increase in hemoglobin level and a decrease in serum CA215 level and dysmenorrhea scores. Compared with their situations before surgery, the difference was significant (P<0.05). A comparison of uterine volume before and after surgery showed that there is a significant decrease in the uterine volume in both groups in6-12 months after surgery (P<0.05).Twenty-four months after surgery, it shows thatthe combination group has a much more significant decrease in uterine volume [(171.3±34.8) mm3] than Mirena group [(213.7±38.6) mm3] (P<0.05). The hysterectomy rate in Mirena group was significantly higher than that in the combination group (12.50% vs 5.36%); the ring expulsion rate was 16.07% in Mirena group and 5.36% in the combination group, and the break through bleeding happeningrate was 8.93% in Mirena group and 3.57% in the combination group. After 36 months an irregular small amount of vaginal bleeding rate was 62.25% in Mirena group, while it was only 12.50% in the combination group. There was significant differencewhen comparing above indices between two groups (P<0.05). There was no obvious differences in most common side effects of both groups. Conclusion · HysteroscopicTCRE combined with Mirena reduces significantly the irregular menstrual bleeding caused by merely applying Mirena. It has a prominent clinical efficacy and can be an effective approach in treatment of adenomyosis.
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@#Objective To repair the traumatic brain injury in adult rats by inducing neural synapses formation with neurotrophin- 3 (NT-3) chitosan scaffolds. Methods 60 adult male Wistar rats were equally divided into lesion group, blank chitosan scaffolds group and NT-3 chitosan scaffolds group. The neural regeneration in the lesion area were observed through immunochemistry 3 days, 7 days, 14 days,28 days, 60 days after operation. Regenerated neural synapses involved the neural circuitry reconstruction in the lesion area were observed through neural tracing and immune electron microscopy 30 days and 60 days after operation. Results The nestin+, β-tubulin-Ⅲ+, microtubule associated protein 2 (MAP2)+ neural cells in hippocampal lesion area were significantly more in the NT-3 chitosan scaffolds group than in the other groups (P<0.01). Newborn neurons that express 5-bromouracil deoxyriboside (BrdU) and MAP2 were observed and formed synaptic connections in hippocampal damage zone in the NT-3 chitosan scaffolds group. Regenerated neural synapses involved the neural circuitry reconstruction in the lesion area. Conclusion NT-3 chitosan scaffolds activate the neural progenitor cells to proliferate and differentiate to mature neurons, which form neural synapses to involve the neural circuitry reconstruction.
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<p><b>OBJECTIVE</b>To evaluate the effect of using dental operating microscope and ultrasonic instruments in treating blocked canals.</p><p><b>METHODS</b>The etiology of canal blockage included calcification, broken instruments, posts, resinifying, etc. 236 blocked canals were treated with ultrasonic tips under dental operating microscope. The success rate was calculated.</p><p><b>RESULTS</b>178 blocked canals were successfully managed with a success rate of 75.4%. The success rate of each category of the blocked canals were: 71.7% for calcified canals, 81.1% for broken instruments, 100% for canals blocked by posts, 62.5% for canals blocked by resinifying therapy, and 84.1% for canals blocked by filling materials.</p><p><b>CONCLUSION</b>The use of dental operating microscope and ultrasonic instruments is proved to be an effective method in the management of blocked canals.</p>
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Humans , Dental Pulp Cavity , Microscopy , Treatment Outcome , UltrasonicsABSTRACT
<p><b>OBJECTIVE</b>To identify the gene mutation in a Chinese family with congenital long QT syndrome (LQTS) and predict the changes of the secondary structure of the protein.</p><p><b>METHODS</b>Polymerase chain reaction and DNA sequencing were used to screen for KCNH2 mutation in the proband. After the mutation was identified, KCNH2 gene of the family members was screened by multiplex PCR with site-specific primers. Network analysis software was used to predict the secondary structure of the KCNH2 protein.</p><p><b>RESULTS</b>A novel heterozygous missense mutation of F463L(GenBank accession no.EU218526) located at the transmembrane domain S2 of KCNH2 was detected. The mutation did not result in the change of the transmembrane domain, but altered the hydrophobicity and secondary structure of the protein.</p><p><b>CONCLUSION</b>The novel mutation identified in this study has enriched the GenBank data of ion channel gene mutation in LQTS. The changes of the secondary structure caused by the gene mutation were analyzed by Mfold and TMHMM software, which may help to understand LQTS.</p>
Subject(s)
Adult , Female , Humans , Male , Amino Acid Sequence , Asian People , Genetics , Base Sequence , DNA Mutational Analysis , ERG1 Potassium Channel , Ether-A-Go-Go Potassium Channels , Chemistry , Genetics , Hydrophobic and Hydrophilic Interactions , Long QT Syndrome , Genetics , Molecular Sequence Data , Mutation, Missense , Pedigree , Protein Structure, Secondary , Protein Structure, TertiaryABSTRACT
@#Objective To observe the effect of the chitosan tube combined with basic fibroblast growth factor(bFGF) on inducing nerve axon regeneration of rats with peripherial nerve injury.MethodsA novel chitosan tube combined with bFGF was developed and used to suture the 10 milimeter long right sciatic nerve gap of 10 rats,single injury group(10 rats) were the control with sciatic nerve injury alone,and other 10 rats were assigned to sham group.Immunohistochemistry and electrophysiology study had been done to observe the effect of repairing.Results3 months after operations,the sciatic nerve gap were repaired by the regeneration nerve in the experiment group.And there was no evident inflammation in the defects.ConclusionThe chitosan tube combined with bFGF can induce the sciatic nerve to regenerate.
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@#Objective To explore the degeneration of motor end plates (MEP) by observing the expression of calcitonin gene-relative peptide (CGRP) and acetylcholine esterase (AChE) in the MEP after different types of spinal cord injury. Methods 60 adult female Wistar rats were randomly assigned to 3 groups: sham group, completely transection group and contusion group. The content of AChE in the MEP was detected with Karnovsky-Roots staining and the expression of CGRP was then determined with immunohistochemistry. Results The content of both AChE and CGRP significantly decreased after either type of spinal cord injury. However, their activity gradually recovered to the normal level in the contusion group, but not in the transection group. Moreover, the changes of CGRP occurred earlier than those of AChE. Conclusion The motor end plate degenerates differently after different kinds of spinal cord injury in adult rat, CGRP and AChE are related to the degeneration of MEP.
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Objective To observe the effects of 5-Aza-2’-deoxycytidine(5-Aza-CdR)on cell proliferation and apoptosis in ovarian cancer cell line SKOV3 and the expression of mismatch repair gene HMLH1/HMSH2, and to investigate the potential mechanism of its antitumorigenesis. Methods Human ovarian cancer cell line SKOV3 was treated with 5-Aza-CdR(0.5, 5 and 50 ?mol/L), a specific demethylation agent for 3 d, and then cultured in RPMI-1640 medium for 7 d.The growth of cells was examined by MTT assay. The apoptosis was analyzed by flow cytometry. The expression of HMLH1 and HMSH2 mRNA was observed by semi-quantitative reverse transcription polymerase chain reaction(RT-PCR). Results SKOV3 cells treated with 5-Aza-CdR displayed a slow growth rate in comparison with that of the control cells, The apoptosis rates of each group were 10.59%?1.57%、17.52%?1.72%、34.10%?1.45%,respectively,which were markedly higher than that of control(P
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Objective:To observe the effect of 5-aza-2'-deoxycytidine on proliferation and apoptosis of ovarian cancer cell lines(SKOV3 and 3AO)and on expression of mismatch repair(MMR)genes(hMLH1 and hMSH2)in SKOV3 and 3AO cells.Methods:Human ovarian cancer cell lines SKOV3 and 3AO were treated for 3 d with 5-aza-CdR(0.5,5,50 ?mol/L),a specific demethylation agent,and then cultured in RPMI 1640 medium for another 7 d.The cells growth was observed by MTT assay before and after 5-aza-CdR treatment and the cell apoptosis was analyzed by flow cytometry.The expression of hMLH1 and hMSH2 mRNA was examined by semi-quantitative reverse transcription polymerase chain reaction(RT-PCR).Results:5-aza-CdR(0.5,5,50 ?mol/L)obviously inhibited the growth of SKOV3 and 3AO cells compared in a concentration dependent manner.The apoptosis rates of SKOV3 cells were(10.59?1.57)%,(17.52?1.72)%,(34.10?1.45)% after treated with 0.5,5,50 ?mol/L 5-aza-CdR,respectively;and the apoptosis rates of 3AO cells were(11.11?2.21)%,(17.24?1.11)%,and(26.53?2.00)%,respectively,which were all markedly higher than those of control group(P