BACKGROUND:Studies have found that bone marrow mesenchymal stem cel s, under certain conditions, can be induced to differentiate into neurons and glial cel s, which to some extent solves the problem of the source of seed cel s. Induction methods currently used are different, and their efficiencies are not the same.
OBJECTIVE:To observe the effects of different antioxidants on differentiation of rat bone marrow mesenchymal stem cel s into neuron-like cel s in vitro.
METHODS:Bone marrow mesenchymal stem cel s from Wistar rats were divided into four groups:non-intervention group,β-mercaptoethanol group, retinoic acid group,β-mercaptoethanol+retinoic acid group. Changes in cel morphology and positive rate of neuron-specific enolase and microtubule-associated protein 2 were observed and detected at 5 hours, 12 hours, 1 day, 3 days, 5 days, 7 days, and 10 days after induction.
RESULTS AND CONCLUSION:Except non-intervention group, bone marrow mesenchymal stem cel s in the other three groups were gradual y becoming spindle-shaped, and gave birth to many smal protrusions that were interconnected into a network, showing neuron-like cel morphology. Immunocytochemical staining showed that the efficiency of theβ-mercaptoethanol+retinoic acid group was the highest at 10 days after induction, and the positive rates of neuron-specific enolase and microtubule-associated protein 2 were 71.63%and 79.72%, respectively. The results show thatβ-mercaptoethanol can be combined with retinoic acid to accelerate the differentiation of bone marrow mesenchymal stem cel s into neuron-like cel s.

The separation of digestive system cancer stem cells (CSCs) is the first step of the study of stem cell.At present,there are three methods of separation of the digestive system CSCs:cell phenotype sorting,side population cell sorting and serum-free culture.The separation of digestive system CSCs is based on these three methods or be improved to a higher proportion of CSCs.

Inhibitors of epidermal growth factor have played an important role in the treatment of oncology.One of the most common adverse effects is aeneform eruption.This article reviews the incidence,clinical manifestation, mechanism and management for acneform eruption which related to inhibitors of epidermal growth factor.

Adolescent ; Asthma ; blood ; Bronchitis ; blood ; Child ; Child, Preschool ; Female ; Humans ; Infant ; Male ; Uteroglobin ; blood

OBJECTIVE:To establish a method for the determination of the dissolution of Qingyangshen dispersible tablets so as to provide method and parameters for quality control of this kind of tablets.METHODS:With water as dissolution medium in a rotating speed of 100 r?min-1,the dissolution of Qingyangshen dispersible tablets was determined by HPLC at a wavelength of 259 nm.RESULTS:Similar dissolution rates were obtained for 3 batches of Qingyangshen dispersible tablets,with accumulative dissolution rates of all samples at 45 minutes reached above 90%,and a good reproducibility was noted.CONCLUSION:The quality of Qingyangshen dispersible tablets is up to the standard stated in Chinese Pharmacopoeia(2005 Edition).

Objective To explore the relationship between organochlorine pesticides exposure after Tangshan earthquake and the breast cancer. Methods 1∶1 matched case-control study was conducted in 150 newly diagnosed cases of breast cancer with histopathological diagnosis from three city-level hospitals in Tangshan,China and 150 matched controls at the same hospitals,without the related diseases. The levels of derivatives of DDT and HCH in serum were measured by gas chromatography (GC) method and epidemiological survey were conducted by questionnaire for 150 pairs of cases and controls. The relationship between the organochlorine pesticides metabolites and the breast cancer of the exposed population was analyzed by conditional logistic regression model by SAS 8.2 Software. Results Compared with the control,significant higher rates of detection of p,p'-DDD and o,p'-DDT were seen in the case group and the levels of p,p'-DDE,?-HCH and ?-HCH in serum were higher in the case group,and there was a significant difference in serum residues levels of ?-HCH,p,p'-DDE and o,p'-DDT in different exposure areas in Tangshan,the high exposure area showed higher residues levels than the low exposure area. Multivariate conditional logistic regression analysis showed high pesticides exposure after the earthquake,the serum residues of p,p'-DDE and p,p'-DDT were associated with breast cancer risk,ORs were 6.592(95%CI:1.402-31.002),2.405(95%CI:1.033-5.600)and 1.845(95%CI:1.028-3.353) respectively. Conclusion Exposure to environmental organochlorines may be one of the risk factors for breast cancer; Higher pesticides exposure after the earthquake may increases breast cancer risk in Tangshan area.

The ethical problems had directly affected the applying and development of organ transplantation.The serious shortage of donors restricted this technique deeply.The analysis on the ethical and moral problem about organ transplantation had been performed from ethical angel.It was proposed that implementation of brain-death legislation,setting up the newly ethical conception and prohibiting the organ business.Voluntary contribution was the first ethical principle in the source of the donor.Medical principles and social standards should be taken into account on the problem of acceptor selection.

Totally 126 patients with malignant breast tumors diagnosed with ultrasound were followed up.The ultrasonic image characters were analyzed and compared with the pathologic outcomes. Ultrasound had a 92.1%(116/126) veracity in the diagnosis of malignant breast tumor,which were characterized by strong echo in the border of the tumors and halo (72.2%, 91/126).There were differences in ultrasonic images of malignant breast tumors with different pathologic types. Ultrasound can determine the character of most breast tumors.

Objective To evaluate the clinical application of HLA matching in highly sensitized recipients of renal allografts.Methods Recipient's panel reactive antibody (PRA) was detected by using ELISA test with Lambda antigen tray (LAT).Donor and recipient HLA classⅠtyping was performed with special monoclonal tray,and HLA classⅡgene typing with micro-sequence specific primers (Micro-SSP).Results There were 104 recipients with anti-HLA class-ⅠIgG antibody,76 with anti-HLA class-ⅡIgG antibody,and 44 with both anti-HLA class-1 and anti HLA class-ⅡIgG antibody respectively in 136 sensitized recipients.HLA class-ⅠIgG antibody positive rate was 11%-97 %,with an average of 49.6%?23.8%;The common public epitopes antibody was not found in each recipient of 13 cases with PRA＜20%,but was found in I2 recipients in 44 cases with PRA be- tween 20%-50%,and 39 recipients in 47 cases with PRA＞50%.HLA class-ⅡIgG antibody posi- tive rate was 17%-100%,with an average of 28.2%?63.8%.The number of cases of 0,1,2,3, 4 MM was 7 (5.1%),26 (19.1%),47 (34.6%),39 (28.7%) and 17 (12.5%) respectively by the standard of conventional HLA antigen matching;however the number of the recipients with 0,1, 2,3 MM was 31 (22.8%),53 (39.0%),36 (26.5%) and 16 (11.7%) respectively according to the rule of HLA CREGs matching and none with 4 MM.Rates of acute rejection in sensitized recipi- ents with 2MM and 3MM HLA-CREGs were 25.0% and 37.5% respectively and were significantly higher than those with 0MM (P＜0.05,＜0.05 respectively).Kidney year-survival was decreased when the number of MM of HLA CREGs matching increased.Conclusion The HLA CREGs matching can improve the ratio of well-matched significantly.Good HLA matching can reduce the incidence of acute rejection in sensitized recipients and increase the survival rate of grafts.

Adolescent ; Child ; Child, Preschool ; Echocardiography, Three-Dimensional ; Female ; Heart Septal Defects, Atrial ; diagnostic imaging ; therapy ; Humans ; Male