Current studies of targeted alpha-particle therapy for hematologic malignancies / 中华核医学与分子影像杂志

Hematological malignancies are suitable diseases for radioimmunotherapy because of their high sensitivity to radiation and well-defined immunophenotypes. Beta emitters like 131I and 90Y have achieved some outcomes in radioimmunotherapy of hematological malignancies. Compared with beta particles, alpha particles have higher linear energy transfer, greater relative biological effects and shorter range, which give alpha particles the ability to kill tumor cells more effectively with less damage to normal tissue. This review summarizes the current studies of targeted alpha-particle therapy in hematological malignancies.

A preliminary experience of retroperitoneal approach by partial resection of the tenth rib for repairing Crawford type Ⅳ thoracoabdominal aortic aneurysm and complex abdominal aortic aneurysm / 中华普通外科杂志

Objective:To evaluate a surgical approach for partial resection of the tenth rib through a retroperitoneal approach for the exposure of Crawford type IV thoracoabdominal aortic aneurysm and complex abdominal aortic aneurysm from 2014 to 2019.Methods:A retrospective analysis was conducted on clinical data and follow-up results of 7 patients who underwent treatment for Crawford type IV thoracoabdominal aortic aneurysm and complex abdominal aortic aneurysm through partial resection of the tenth rib via a retroperitoneal approach.Results:One case (14.3%) had associated Marfan syndrome, and 5 cases (71.4%) underwent left renal artery reconstruction. None of the patients experienced severe complications such as cardiopulmonary complications or renal failure postoperatively, and there was no statistically significant difference in serum creatinine levels between preoperative and postoperative stages during hospitalization ( P=0.205). Follow-up examinations showed no long-term vascular stenosis. Conclusions:Partial resection of the tenth rib through a retroperitoneal approach can avoid incisions of the pleura and diaphragm. It allows for the exposure of the aorta below the diaphragm and has the ability to treat aortic diseases below the diaphragm with smaller incisions and lower complication risks.

Research into tibial tunnel location in reconstruction of posterior cruciate ligament / 中华创伤骨科杂志

Posterior cruciate ligament (PCL) injury is common in sports medicine. Arthroscopic reconstruction of PCL has become a routine procedure to stabilize the knee joint after PCL injury. The location of tibial tunnel during operation is crucial to a successful surgery. This article reviews the current studies on transtibial PCL reconstruction from the aspects of the anatomy related to the tibial tunnel, the anteromedial and anterolateral tibial tunnels, the maximum angle and optimal angle of tibial tunnel, and the anatomical and non-anatomical tibial tunnels, hoping to provide helpful references for the treatment of PCL injury.

Effects of PNF Training on Functional Recovery of Sports Rotator Cuff Injury / 医用生物力学

Objective To explore the effect of proprioceptive neuromuscular facilitation (PNF) rehabilitation training on functional recovery of athletic rotator cuff injury. Methods Twenty-two college students with athletic rotator cuff injuries were stratified according to their gender and randomly divided into resistance band + passive joint range of motion (ROM) training group (control group) and PNF training group (experimental group). The visual analog scale (VAS) was used to evaluate subjective pain intensity of the shoulder joint. Pain positive rate for each manipulation test of rotator cuff injury was observed, and active ROM and muscle strength of the shoulder joint were measured. Improved UCLA shoulder joint score was used to evaluate comprehensive function of the shoulder joint. Results After training, VAS scores and pain positive rate in two groups were lower than those before training, and VAS scores and pain positive rate in experimental group were lower than those in control group. Muscle strength, active ROM in all directions and improved UCLA score of the shoulder joint in two groups were also higher than those before training, and the internal rotation muscle strength, the internal rotation and external rotation active ROM, improved UCLA score of the shoulder joint in experimental group were higher than those in control group. Conclusions PNF rehabilitation training can reduce the pain of athletic rotator cuff injury, improve the active ROM, muscle strength and UCLA shoulder joint score. The function recovery effect of PNF training is better than that of resistance band + passive ROM training.

Advances in the research of growth hormone in the treatment of diabetic foot ulcers / 中华烧伤杂志

Diabetic foot ulcer is a common complication of diabetes mellitus and the main cause of disability and death of diabetic patients, which has become an international medical and health problem. In recent years, the clinical usage of growth hormone in the treatment of diabetic foot ulcer has achieved good results. This article reviews the relevant literature at home and abroad, and summarizes the possible efficacy and mechanism of growth hormone in the treatment of diabetic foot ulcers.

Retrospectively analysis the Guangdong’s experience on how to transport potential infected passengers by chartered aircraft during outbreaks of COVID-19 / 中华急诊医学杂志

Objective:To summarize the experience of five hospitals in Guangdong Province on successfully transporting retained passengers by chartered flights during the outbreak of the COVID-19.Methods:We retrospectively evaluated the operation and management, cabin arrangement, isolation requirements, and personnel protection in the aspect of epidemic prevention and control.Results:In 11 charter missions, over one thousand "healthy" passengers with potential risk of infections were transported back to China. The medical delivery team and flight crew were kept free of infection, passengers maintained zero cluster infections and no unexpected adverse events during the air transport.Conclusions:Our results indicate how to carry passengers in a scientific and orderly way is crucial for avoiding the transmission risks of the epidemic of COVID-19 among working staffers and passengers during air transportation.

Improvement of dual liver transplantation rat model / 器官移植

Objective To establish a modified dual liver transplantation rat model. Methods Based on the classic donor Y-shaped double iliac vein recanalization of bilateral liver grafts and portal vein and bile duct of the recipients, the dual liver transplantation rat model was modified by increasing the rat body mass, increasing the right lower lobe of the right graft, appropriate bile duct length, trimming Y-shaped blood vessels, and "triangular" anastomosis. The operation time, cold ischemia time, warm ischemia time and anhepatic phase of dual liver transplantation were recorded. The incidence of postoperative complications of the recipients was observed. The survival rates of the recipients at postoperative 7 and 30 d were calculated. Results The operation time of dual liver transplantation in rat was (114±7) min, the cold ischemia time was (36±3) min, the warm ischemia time was (9.7±1.6) min, and the anhepatic phase was (19.9±2.2) min, respectively. The incidence of postoperative complications in the recipient rats was 31% (5/16) including 2 cases of peritoneal effusion, 1 case of hemorrhage, 1 case of bile leakage and 1 case of respiratory obstruction. The postoperative 7- and 30-d survival rates of the recipient rats were 81%(13/16)、56%(9/16), respectively. Conclusions The modified technique can establish a stable dual liver transplantation rat model, which deserves widespread application.

Posttransplant lymphoproliferative disorders: a clinicopathological analysis of 11 cases / 肿瘤研究与临床

Objective@#To analyze the clinicopathological features of the posttransplant lymphoproliferative disorders (PTLD) and to improve the diagnostic levels.@*Methods@#The clinical data of 11 patients diagnosed with PTLD between January 2008 and January 2018 from Henan Provincial People's Hospital, Peking University Science Center and the Affiliated Third Hospital of Peking University were collected. The clinicopathological features and the potential prognostic predictors were retrospectively analyzed by using immunohistochemical staining, EB virus in situ hybridization, fluorescence in situ hybridization and gene sequencing.@*Results@#There were 9 males and 2 females in 11 PTLD patients, and the median age of the total patients was 18 years old (3-34 years old). The median time of 9 cases who underwent hematopoietic stem cell transplantation developing PTLD was 4 months (2-24 months) after the transplantation. The other 2 cases undergoing solid organ transplantation (SOT) occurred PTLD after 6 months and 13 months, respectively. The lymph node was the most common site to be involved (9 cases), 1 case occurred in liver and 1 case occurred in nasopharynx site. Among 11 patients, 3 cases were classified as polymorphic PTLD (P-PTLD) and the other 8 cases were monomorphic PTLD (M-PTLD). EB virus of all cases was positive, and 8 cases of M-PTLD were classified as diffuse large B-cell lymphoma (DLBCL). Fluorescence in situ hybridization was used to detect bcl-2, myc, IGH and A20 gene, and only one case had the gene break of IGH, while other cases didn't find any other abnormalities. Ig gene clone analysis was made in 5 patients with PTLD, including 4 cases of M-PTLD with gene rearrangement and 1 case of P-PTLD without gene rearrangement. Univariate analysis showed that age (≤18 years old) was associated with poor prognosis (P = 0.040).@*Conclusions@#The clinicopathologic features of PTLD are various and infected by EB virus. Gene rearrangement can help the diagnosis.

Study on Anti-synovial Angiogenesis Mechanism of Licorice and Aconite Decoction in the Treatment of Adjuvant Arthritis Model Mice / 中国药房

OBJECTIVE： To investigate the therapeutic effect of Licorice and aconite decoction in the treatment of adjuvant arthritis （AA） model mice through anti-synovial angiogenesis pathway. METHODS： Totally 48 male Balb/c mice were randomly divided into normal group， model group， Licorice and aconite decoction group and tripterygium glycosides group （positive drug group）， with 12 mice in each group. Except for normal group， AA model was established by intradermal injection of Freund’s complete adjuvant into the left hind toe of mice. 12 d after modeling， normal group and model group were given same volume of water intragastrically； Licorice and aconite decoction group （7.8 g/kg，by total amount of crude drug） and tripterygium glycosides group （0.01 g/kg） were given relevant medicine 20 mL/kg intragastrically， once a day， for consecutive 18 d. The joint lesions of mice were observed and recorded， and the foot swelling degree of mice was measured by water volume method. HE staining was used to observe the pathological change of ankle joint in mice. The protein levels of platelet endothelial cell adhesion molecule-1 （CD31） and vascular endothelial growth factor （VEGF） were determined by immunofluorescence assay. The protein expressions of nuclear factor κB（NF-κB） and zinc finger transcription factor GATA4 （GATA4） were detected by Western blotting assay. RESULTS： Compared with normal group， ankle joint of model group mice was markedly reddened and swollen， and foot swelling degree increased significantly （P＜0.05）. Synovial tissue of ankle joint proliferated， pannus increased significantly， and a large number of inflammatory cells and joint erosion were observed. The protein expression of CD31， VEGF， NF-κB and GATA4 in synovial tissue of mice were increased significantly （P＜0.05）. Compared with model group， the redness and swelling of ankle joint in mice were alleviated， and the foot swelling degree was significantly reduced in Licorice and aconite decoction group （P＜0.05）. Pannus in synovial tissue decreased and other pathological symptoms were improved. The protein expression of CD31， VEGF， NF-κB and GATA4 were decreased significantly in synovial tissue （P＜0.05）. CONCLUSIONS： Licorice and aconite decoction can decrease the protein expression of VEGF，NF-κB and GATA4 in synovial tissue， reduce the generation of pannus in synovial tissue and effectively inhibit the angiogenesis in synovial tissue so as to prevent bone destruction and protect joint of AA model mice.

Application of"4P"theory in the treatment of severe infection wounds of perineum / 中国医师杂志

Objective To discuss the treatment program and experience of " 4P" theory in the treatment of severe infection wounds of perineum.Methods Retrospective analysis of 123 cases of severe infection wounds of perineum in our hospital from March 2016 to February 2018.Following the "4P" theory (T wound debridement-preparation,I prevention and treatment of infection-protection,M dry-wet balanceprogress,E wound edge management-promotion),personalized treatment program was implemented to ensure the normal physiological activities of patients while closing the wound and promoting wound healing.Results There was no death and no serious complications.All the patients were discharged from the hospital after the wound healed well.Wound healing time was (10.37 ±3.25)days.The follow-up time was 2 to 10 months,the median follow-up was 6 months.The recurrence occurred in 3 case and chronic pain in 5 cases during the follow-up.Conclusions According to the main factors affecting wound healing,"4P Theory" can protect the wound to the maximum extent and is safe and effective in the treatment of severe infection of perineal wound.

Dual-graft living donor liver transplantation / 中华肝胆外科杂志

Shortage of donors is a major obstacle for liver transplantation.Lee innovated dual graft living donor liver transplantation in 2001,obtained graft from two donors,and it was conducted in various parts of the world.At present,South Korea has the biggest numbers in operation,China,Japan,and Germany.Turkey,Romania,and other countries are relatively less;current clinical liver donor liver transplantation is mainly based on single graft living donor liver transplantation,and in some complicated cases,single graft liver transplantation cannot be completed due to various factors,at this situation dual grafts living donor liver transplantation can complete the treatment.Although dual donor liver transplantation can only be carried out in a few areas due to complex surgical procedures,it can enrich the treatment of liver transplantation and promotes the development of liver transplantation.

Misdiagnosis as diffuse large B-cell lymphoma: clinicopathological analyses of 431 patients / 肿瘤研究与临床

Objective To analyze the cases that are easily misdiagnosed as diffuse large B-cell lymphoma (DLBCL),and to explore the diagnosis,differential diagnosis and clinicopathological features of DLBCL.Methods The clinicopathological data of 431 cases preliminarily diagnosed as DLBCL in the Department of Pathology,School of Basic Medical Science,Peking University from October 2016 to December 2017 were retrospectively analyzed.Further immunohistochemical staining and molecular biological tests were performed if necessary.Results The diagnostic accuracy rate of DLBCL was 88.86％ (383/431).Misdiagnosis mainly occurred in follicular lymphoma (36 cases,8.35％),high-grade B-cell lymphoma (HGBL) with gene rearrangement of c-myc and bcl-2 or bcl-6 (4 cases,0.93％),atypical lymphoid tissue hyperplasia (3 cases,0.70％),mantle cell lymphoma (3 cases,0.70％),classic Hodgkin lymphoma (CHL) (1 case,0.23％) and composite lymphoma (DLBCL and CHL) (1 case,0.23％).Except the poor quality of sections,the lack of immunohistochemical markers,the poor knowledge of the diagnosis of DLBCL and high-grade FL as well as HGBL were the main reasons of misdiagnosis.Conclusions The diagnosis and differential diagnosis of DLBCL is based on morphology,and it needs to combine with the corresponding immunohistological markers and molecular biological detection when necessary.The recognition of clinical and pathological features of various types of misdiagnosed lymphomas should be strengthened.

Expression of NUF2 in breast cancer and its clinical significance / 南方医科大学学报

OBJECTIVE@#To investigate the expression of the cell division- associated gene NUF2 in breast cancer and its clinical significance.@*METHODS@#The expression of NUF2 in breast cancer tissues was analyzed using Oncomine database. The relationship between the expression of NUF2 and the prognosis of breast cancer was analyzed using the Kaplan-Meier Plotter database. Gene set enrichment analysis (GSEA) and GEO database were used to investigate the effect of NUF2 on gene enrichment. The String database was utilized to analyze the proteins associated with NUF2. The TIMER database was analyzed to assess the correlations of NUF2 with BUB1, MAD2L1 and MYC. The expressions of NUF2 mRNA in 8 pairs of breast cancer tissues and adjacent tissues were verified by q-PCR.@*RESULTS@#Compared with that in normal breast tissue, NUF2 was significantly overexpressed in breast cancer ( < 0.001). The overall survival time (HR = 1.52, = 0.015) and the recurrence-free survival time (HR = 1.85, = 3.2e-14) of the patients with high NUF2 expression were significantly shorter than those of patients with low NUF2 expression. In patients with high NUF2 expression, the enriched genes were involved mainly in cell cycle, P53, G2/M, DNA repair, MYC, and PI3K-AKT-MTOR signaling pathways, which were associated with tumor proliferation, invasion, metastasis and stemness. Combination of the results of String database, gene enrichment and TIMER database analyses suggested that NUF2 interacted directly with BUB1, MAD2L1, and MYC, which could promote the progression of breast cancer. The results of q-PCR showed that NUF2 expression was up-regulated in 6 cancer tissues and down-regulated in 2 cancer tissues.@*CONCLUSIONS@#NUF2 gene is overexpressed in breast cancer, and its expression level is important in predicting the prognosis of breast cancer.

Significance of the items for Dizziness Handicap Inventory in differential diagnosis of benign paroxysmal positional vertigo / 中南大学学报(医学版)

To explore the value of items for the Chinese version of Dizziness Handicap Inventory (DHI) in differential diagnosis of benign paroxysmal positional vertigo (BPPV) in patients with vertigo or dizziness first coming to the outpatient clinic.
 Methods: A total of 322 patients with vertigo or dizziness, who came from Nanfang Hospital, Southern Medical University, were enrolled from April 2016 to February 2017. The Chinese version of DHI and Visual Analogue Scale (VAS) were completed by themselves. After detailed vestibular function examination, the patients were divided into a BPPV group, a normal vestibular group, and a abnormal vestibular group.
 Results: The score of DHI-2 in the BPPV group was 5.52±2.10, which was higher than that in the normal vestibular group (3.94±2.91)(t=3.847, P0.05).
 Conclusion: DHI-2 and DHI-item 13 should be included in the inquiry of disease history at the time of first diagnosis, which can be used to identify patients with BPPV quickly and effectively.

Functional remnant liver volume to spleen volume ratio is a useful predictive factor for posthepatectomy liver dysfunction / 中华肝胆外科杂志

Objective Toidentify factors contributing to posthepatectomy liver dysfunction (PHLD),focusing on the Functional remnant liver volume to spleen volume ratio (FreLSVR).Methods The clinical data of 74 patients undergoing precise liver resection from January 2016 to October 2017 were retrospectively analyzed.IQQA liver system was used to reconstruct the liver and spleen 3D image by using patients' preoperative abdominal CT image data.Tumor volume,3D estimated functional residual liver volume,spleen volume and FreLSVR were measured and calculated.Preoperative and postoperative liver function test,blood coagulation function test,operation time,intraoperative blood loss,and the volume of daily postoperative abdominal drainage were recorded.Correlations between multiple parameters and PHLD were analyzed.Results PHLD occurred in 16 (21.6％).Single factor analysis revealed that the standardized residual liver volume ratio (P＜0.05),FreLSVR (P＜0.05) and preoperative AST value (P＜0.05) were correlated with postoperative hepatic insufficiency.Multivariate regression analysis showed that FreLSVR (OR=0.535,95％CI=0.305～0.936,P＜0.05) was the only independent factor of PHLD.In the ROC curve analysis for FreLSVR,a cut-off value of 2.56 (AUC=0.824,Sensitivity 81.1％,specificity 71.7％.) was the appropriate value for predicting the risk of PHLD according to Youden index.Then the patients were regrouped according to this cut-off value.Compared with the FreLSVR＞2.56 group (53 cases),the highest postoperative INR value (1.46± 0.19 to 1.29± 0.29,t=-2.405,P＜0.05) was higher that of FreLSVR≤2.56 group,and the amount of average daily abdominal drainage in one and two weeks after operation was higher,(188.0(79.2 ～ 375.1)ml to 96.0(46.5 ～ 179.3)ml,P＜0.05) and (207.2(125.6 ～ 827.1)ml to71.8(14.0 ～ 179.8) ml,P＜0.05),respectively.Conclusion FreLSVR has significant correlation with postoperative hepatic dysfunction,and provides guidance for the safety of liver resection in the future.

Immunotherapy of tacrolimus in small volume liver transplantation of rats / 中华肝胆外科杂志

Objective To detect the plasma concentration of tacrolimus and the survival time of rats after small-volume liver transplantation,and to investigate the criteria for immunological rejection after small-volume liver transplantation.Methods Lewis rats and Brown Norway rats were used to establish a small volume and normal liver volume transplantation model,which were divided into 7 groups:whole liver transplantation group (WI),small volume allogeneic liver transplantation group (SI),and whole liver allograft group (WA),small volume allogeneic liver transplantation group (SA),whole liver allograft immunotherapy group (WAT),small volume allogeneic liver transplantation immunotherapy group (SAT),small volume allogeneic liver transplantation immunotherapy modulation group (SATa).Morphological and functional changes of liver tissue were studied postoperatively,AST and tacrolimus plasma concentrations were detected,and survival was recorded.Results Compared with the WA group,the inflammatory cells infiltrated in the portal area of the SA group,the inflammatory changes of the sinusoidal endothelial cells,and the proportion of TCRpositive lymphocytes increased.Four days after transplantation,peripheral blood tests showed that CD4+CD25+ double positive lymphocytes were significantly lower in the allograft group than in the allograft group,and the positive expression rate in the SA group (0.6％) was significantly lower than that in the WA group (1.8％).The differences were statistically significant (P＜0.05).In the SAT group,the blood concentration of tacrolimus was significantly higher than that in the WAT group at each time point (P＜0.05).The blood concentration of tacrolimus in the SATa group was relatively stable,and the plasma concentration of the SATa group was stable.And AST was significantly lower than the SAT group,the differences were statistically significant (P＜0.05).Compared with WAT group,the proliferation and apoptosis rate of hepatocytes in SAT group and SATa group were significantly increased.The proliferation of hepatocytes in SATa group was significantly higher than that in SAT group (P＜0.05).Survival analysis showed that the cumulative survival rate of the WA group was 85.7％,which was significantly higher than that of the SAT group (28.6％).The difference was statistically significant (P＜0.05).The cumulative survival rate of the SATa group was 51.7％.The survival time of WAt group was (57.4±25.0) days,SAT group was (28.0±29.10) days,SATa group was (39.7± 29.0) days,which were longer than untreated groups.The ratio of proliferation to apoptosis (PRA) increased with increasing time of tacrolimus.Regardless of blood concentration,tacrolimus plasma concentration was positively correlated with AST (R =0.758,P＜0.05),indicating RPA was inversely correlated with AST (R=-0.962,P＜0.05).Conclusion The use of tacrolimus significantly prolonged the survival time of small-volume allogeneic liver transplantation rats.Adjusting the amount of tacrolimus under the guidance of tacrolimus plasma concentration and AST serum value equation TD =-0.494TC-0.0035AST+ 260.487 to make the blood concentration relatively stable,it can further extend the allogeneic liver transplantation rat time to live.

Perioperative management of hilar cholangiocarcinoma / 国际外科学杂志

Cholangiocarcinoma is a malignant tumor originating from bile duct epithelial cells, among which hilar cholangiocarcinoma is the most common, accounting for about 58％-70％ of cholangiocarcinoma. Due to its atypical clinical features, special anatomical site, low radical resection rate, high recurrence rate and poor prognosis, the 5-year survival rate of hilar cholangiocarcinoma was only 14.7％-33.8％. Hence, the most effective method of hilar cholangiocarcinoma lies in early diagnosis and radical resection. Good perioperative management can improve the rate of radical resection of hilar cholangiocarcinoma and contribute a lot to prognosis of the patients. The perioperative management of hilar cholangiocarcinoma is described as follows.

Diagnosis and treatment of testicular torsion: a clinical analysis of 95 cases / 中华全科医师杂志

Objective To analyze the clinical features,diagnosis and treatment of testicular torsion.Methods The clinical data of 95 patients with testicular torsion admitted from March 2001 to April 2017 were analyzed retrospectively.Results The age of patients ranged from 13 to 42 years (mean 19.6 years).Among 95 patients,91 cases had essential clinical symptoms of scrotal pain;1 case reported the right testicular enlargement without pain,and 3 cases presented with left inguinal mass.Color Doppler flow imaging (CDFI) was performed in 91 patients,reduction or loss of blood flow signals were detected in 88 cases,and normal blood flow signals were presented in 3 cases.The diagnosis of testicular torsion was confirmed by CDFI in 91 cases before surgery,and 4 cases were diagnosed by medical history and physical examination.The duration from onset to surgery was ＜ 5 h in 10 cases,5-10 h in 25 cases,and ＞ 10 h in 60 cases.All the patients received operation,92 cases were diagnosed as testicular torsion in scrotum and 3 cases as cryptorchidism torsion after surgery.Among 92 cases of testicular torsion in scrotum,twisted testicles were removed in 41 cases and the testicles were retained in 51 cases;while testicles were removed in 1 case of cryptorchidism torsion,and the testicles were fixed in the scrotum in other 2 cases of cryptorchidism.Sixty eight patients were postoperatively followed-up for 1 month to 15 years,the retained necrotic testis atrophy occurred in 1 case,and the testicular size was normal in other 67 cases.In the 68 cases,there was no testicular discomfort and no testicular torsion after operation.Conclusions CDFI is valuable in preoperative diagnosis of testicular tortion.Once the diagnosis is made,it should be operated as soon as possible to retain the testicular function,and the affected testicle should be retained with caution for cryptorchidism torsion.

Research and development of medical record assistant management system / 医疗卫生装备

Objective To establish a basic information database of hospital medical records management and improve the management process.Methods The system was developed with C# programming language,basic information from Oracle 10g databases of HIS and electronic medical record system (EMRS),which stored corresponding information during the process into SQL 2005 database and generated early warning information based on statistical analysis on medical records.Results The system realized standardized filing of medical records,synchronized filing of electronic medical record and the first page of medical record,normalized lending of medical record,auto generation of statistical reports,auto alarming in case of standard-exceeded information and etc,which could be used as a platform for medical record management.Conclusion The system enhances the efficiency and management of medical record section,and thus is worthy promoting practically.

Isolation, identification and biological characteristics of rat bone marrow mesenchymal stem cells / 中国组织工程研究

BACKGROUND: How to effectively harvest bone marrow mesenchymal stem cells with homogeneity is crucial for cartilage tissue engineering research. OBJECTIVE: To isolate and culture rat bone marrow mesenchymal stem cells and to observe biological characteristics of the cells. METHODS: Bone marrow mesenchymal stem cells were isolated from the femur and tibia of 30 Sprague-Dawley rats using the whole bone marrow adhesion method. Cell surface markers were identified using flow cytometry, cell proliferation ability was observed through cell counting, and cell survival rate was determined by MTT assay. RESULTS AND CONCLUSION: The harvested cells were mostly round and oval, which partially showed a triangular shape. Cell fusion appeared after 12-15 days of inoculation. The proliferation of passaged cells was accelerated. Two hours after passage, the cells evenly covered the bottom of the culture dish. With the increasing of cell generations, the cell proliferation ability was gradually decreased. The survival rates of cells at passages 1-5 were over 95%, significantly higher than those at passages 6 and 7 (P < 0.05). The harvested cells were negative for CD34, but positive for CD44. To conclude, the whole bone marrow adhesion method is effective to isolate rat bone marrow mesenchymal stem cells with stable growth and strong proliferation ability. Passage 5 cells can be selected as seed cells for cartilage tissue engineering.