BACKGROUND:Three-dimensional (3D) nanofiber scaffolds are aimed to mimic the physical and chemical signals of stem celsin vivo. 3D nanofiber scaffolds, which are capable to maintain the activity of stem cels, are promising in tissue regeneration and stem celltherapy. OBJECTIVE:To review the synthesis methods for 3D nanofiber scaffolds, and the interactions of stem cels and 3D scaffolds as wel as the current progress of 3D nanofiber scaffolds in tissue engineering. METHODS:Web of Science was searched with key words of “tissue engineering, nanofiber scaffold, stem cellfate” in English for articles relevant to stem celltissue engineering and 3D nanofiber scaffolds. RESULTS AND CONCLUSION:3D nanofiber scaffolds can mimic the physical architecture ofin vivo microenvironment due to its nano-scale topology. Chemical modification of scaffolds endows chemical cues to stem cels. Therefore, 3D nanofiber scaffold can be a promising delivery vehicle of stem cels in tissue engineering. Nanofiber scaffolds can be synthesized through self-assembly, sol-gel phase separation, and electric spinning. 3D nanofiber scaffolds have been shown to improve thein vitro proliferation of hematopoietic stem cels, embryonic stem cels, mesenchymal stem cels, and neural stem cels. 3D nanofiber scaffolds with specific topology/chemical properties can induce the differentiation of stem cels into bone, cartilage, nerve, or muscle. 3D nanofiber scaffold which provides a satisfactory microenvironment for stem cellenhance the performance of stem celltherapy.

Acupuncture Therapy ; Acupuncture, Ear ; Adolescent ; Adult ; Child ; Conjunctivitis ; therapy ; Female ; Humans ; Male ; Young Adult

Objective To study clinicopathologic features of ALK-positive large B-cell lymphoma.Methods The clinical data,histopathological characteristics,immunophenotype and fluorescence in situ hybridization (FISH) result of a patient with ALK-positive large B-cell lymphoma were analyzed and discussed combined with related literatures.Results A 30-years-old male patients with the left neck lymphadenectasis was studied.Histological evaluation revealed the tumor grew in sheets in the nodal,with round nuclei,dispersed chromatin,a single prominent central nucleolus and moderate amounts of eosinophilic to amphophilic cytoplasm.The neoplastic cells exhibited immunoblastic/plasmablastic morphology.Immunohistochemistry measurement showed that the tumor cells were marked positively by CD138,ALK-1,CD45RO,CD4,Perforin,CD117 and Kappa proteins,while negatively by CD3,CD8,CD20,CD30,CD38,CD57,CD79a,Pax-5,EMA and AE1/AE3 proteins.FISH test demonstrated the presence of ALK gene translocation.The patient was given 4 cycles of CHOP chemotherapy after surgery.However,the conditions deteriorated after 4 months.Now the patient continued to receive treatment.Conclusion ALK-positive large B-cell lymphoma represents a distinct variant of diffuse large B-cell lymphoma,and the tumor has special histological features along with a distinct immunophenotype and ALK gene rearrangement.

5 mm. Oblique coronal MR of secrum could show the full length of sacral never. There were some primiral espression of MR of sacral neurological dam-age -- the variation of sacral never canal, the fatty disappearance of peri-never, the route alteration of never. 14 patients were followed up from 6 to 12 months with an average of 7.1 months. According to the BMRC score system the excellent result was obtained in 9 cases, good in 1 case, no change in 1 case. Con-clusion Clinic history and neurological examination associated with X-ray, CT and MRI was the important of the diagnosis of sacral neurological damage, the new surgical approach may be a ideal approach to treat sacral neurological damage in the sacral nerve canal region.

Objective To evaluate the value of MRI in diagnosing the bucket handle tear (BHT) of the knee meniscus.Methods Eighty four knees which underwent both MRI and arthroscopy (AS) examinations were analyzed. Results of AS were used as golden standard to evaluate the results of MRI. The evaluating criteria included primary reports, central displaced fragments of meniscus (CDFM), double posterior cruciate ligament sign (DPCLS) and the absent bow tie sign (ABTS). Results For MRI diagnosing BHT, the sensitivity and specificity of primary reports were 43% and 87%, respectively; the sensitivity and specificity of CDFM were 72% and 87%, respectively; the sensitivity and specificity of the DPCLF were 31% and 97%, respectively; and the sensitivity and specificity of the ABTS were 71% and 69%, respectively.Conclusions When MRI was applied to diagnose BHT, the CDFM had higher sensitivity and specificity, while the ABTS had higher sensitivity and lower specificity. The DPCLF had the highest specificity and the lowest sensitivity.

Cervical Vertebrae ; Child ; Foreign Bodies ; Humans ; Male ; Pharynx

Objective To investigate the correlation of pathology factors and prognosis of gastrointestinal stroma tumors (GIST). Methods The expression of CD117, CD34, SMA, S-100 and Ki-67 in 91 GIST cases were studied by Envision method of immunohistocbemistory;Sequently, the relationship of the location, the size, the hemorrhage, cellular necrosis, stroma mucus, the mitosis, Ki-67 expression and the prognosis were analyzed by SPSS 12.0. Results The positive rate of CD117, CD34, SMA, S-100 were 80.21%, 73.63 %, 34.07 %, 7.69 % respectively. There had significant difference between the location, the mitosis, Ki-67 expression and the prognosis; but no significant difference between the location, the hemorrhage, cellular necrosis, stroma mucus, CD117 expression and the prognosis. Conclusion The tumor's size, mitosis, and Ki-67 expression are associated with prognosis; CD117 expression and prognosis. Even more, Ki-67 expression may be a more precise factor to judge the tumor's biological behaviour compared to the mitosis. As a wally classified method, the Flecther classification is worth to spread.

Adult ; Altitude ; Chordoma ; surgery ; Endoscopy ; Female ; Humans ; Nasal Cavity ; surgery ; Paranasal Sinuses ; surgery ; Skull Base ; surgery ; Video-Assisted Surgery

BACKGROUND: It has been reported that nanosilver-containing biomaterials produce bad biological effects after they directly contact with or are implanted into human body.OBJECTIVE: To investigate whether nanosilver yields potential adverse biological effects on human body and to evaluate its bioiogical safety.DESIGN, TIME AND SETTING: An animal experiment observation was performed at the Medical Device Center of National Institute for the Control of Pharmaceutical and Biological Products from June 2005 to August 2006.MATERIALS: Nanosilver particles and microsilver particles were purchased from Sigma Company, USA.METHODS: Thirty rats were randomly divided into 3 groups, with 5 male and 5 female rats per group: nanosilver, microsilver, and blank control. Nanosilver and microsilver particles were respectively and subcutaneously implanted for subchronic toxicity test.The nanosilver and microsilver groups were given 0.33 g/kg nanosilver and microsilver, respectively. Rats from the blank control group received identical procedure, with the exception of drug application. Four rats were selected from each group for determination of silver content in serum and some organs by plasma mass spectrometry.MAIN OUTCOME MEASURES: serum biochemical indices, organ coefficient, and silver content.RESULTS: There was significant difference in individual organ coefficient between each drug application group and blank control group. But no significant difference in absolute mass was found between each drug application and the blank control group.These findings suggested no clinical significance of organ coefficient. Other organ coefficients were in the normal range, and there was no significant difference between each drug application group and the blank control group. Patho-histological changes related to toxicity were not found. Rats from the nanosilver group did not show toxic reaction.CONCLUSION: Nanosilver produces potential adverse biological effects after implanted into human body.

Objective To investigate the value of drug intervention for difficult weaning from mechanical ventilation. Methods A prospective single-blind randomized controlled trial was conducted. 120 patients with difficult weaning from mechanical ventilation encountered in Department of Critical Care Medicine of Peking University Third Hospital from January 2008 to December 2013 were included,and the patients were divided into treatment group and control group according to random number table,with 60 cases in each group. Patients received furosemide therapy in the treatment group 3 days before weaning up to 48 hours after weaning in order to control negative liquid balance. Enema was given the day before weaning to reduce abdominal pressure. On the weaning day,all of the patients received nitroglycerin and beta blocker or cedilanid to prevent or control elevation of blood pressure and heart rate in the process of weaning. All patients in treatment group received anisodamine in small dosage 2 hours before extubation.The patients in control group received conventional treatment without drug intervention. Baseline indexes of two groups were compared,including the heart rate,respiration rate(RR),mean arterial pressure(MAP),pulse blood oxygen saturation(SpO2),blood gas,hemoglobin(HG),albumin(ALB)and creatinine(Cr). The main reasons of difficulty in weaning,sedative and analgesic drug selection,presence of abdominal discomfort before weaning,interval between sputum suction before extubation,liquid balance at the beginning of the investigation and at time of weaning,24 hours and 48 hours after weaning,failures of spontaneous breathing test(SBT),length of mechanical ventilation,length of ICU stay,and total length of mechanical ventilation and total length of ICU stay during hospitalization. Results There was no statistically significant difference in the heart rate,RR,MAP,SpO2,blood gas,HG,ALB,Cr at the beginning of the investigation between the two groups. The main reasons for difficult weaning in both groups of patients were respiratory dysfunction,cardiac insufficiency,and central nervous system dysfunction. The use of propofol combined dexmedetomidine in the treatment group was more frequent than the control group〔16.7%(10/60)vs. 1.7%(1/60),χ2=8.107,P=0.004〕,and there was no statistically significant difference in the use of other combinations of sedative drugs between the two groups. Abdominal discomfort before weaning was milder in treatment group as compared with control group〔10.0%(6/60)vs. 25.0%(15/60),χ2=4.675,P=0.031〕. The interval between sputum suction before extubation in the treatment group was significantly longer than that of the control group〔hours:1(1,2)vs. 1(1,1),Z=-2.209,P= 0.027〕. SBT failure was less frequent in treatment group compared with control group〔times:0(0,1)vs. 1(1,2),Z=-6.561,P=0.000〕. Liquid balance was better in the treatment group than the control group at time of weaning,24 hours and 48 hours after weaning〔at time of weaning:-567.71 (-755.95,-226.41)vs. 1 256.76(472.48,1 796.63),Z=-9.038,P=0.000;24 hours after weaning:-5.03 (-530.28,245.09)vs. 342.28(125.36,613.25),Z=-4.711,P=0.000;48 hours after weaning:115.50(-450.26, 485.00)vs. 330.00(16.25,575.25),Z=-1.932,P=0.053〕. Compared with control group,length of mechanical ventilation〔days:1.0(1.0,2.0)vs. 2.0(2.0,3.0),Z=-6.545,P=0.000〕,ICU stay time〔days:3.0(3.0,4.0) vs. 4.0(4.0,5.0),Z=-6.545,P=0.000〕,and total length of mechanical ventilation〔days:8.0(6.0,12.0)vs. 11.0(8.0,15.0),Z=-4.091,P=0.000〕and total length of ICU stay during hospitalization〔days:12.5(9.2,19.0) vs. 17.0(12.0,29.5),Z=-2.722,P=0.000〕were all significantly shorter in the treatment group. Conclusions Adjuvant drugs therapy is helpful in patients weaning from the mechanical ventilation,and can shorten length of mechanical ventilation and ICU stay time. Propofol,combined dexmedetomidine,is helpful for weaning.