The clinical treatment of large-area trauma or intractable wound is very difficult. Finding a suitable wound dressing is very important for wound healing. Stem cells can secrete and express a variety of cytokines necessary for wound healing, and can grow and proliferate for a long time in three-dimensional (3D) scaffold materials to maintain their proper structure and function. A large number of studies have shown that transplanting stem cells-3D scaffold complex into the skin wound in the form of a moist dressing can significantly improve the efficiency of stem cells transplantation, shorten the wound healing time, and reduce scar formation. Stem cells-scaffold complex are likely to be a good wound dressing. This article mainly summarizes the selection of wound dressing and the research status of stem cells-3D scaffold complex as a wound dressing, aiming to provide a theoretical basis for the clinical application of stem cells-3D scaffold complex.

Humans ; Occupational Health ; Refuse Disposal

Objective To explore the effect of Mycobacterium tuberculosis antigen (Mtb-Ag) on neutrophils apoptosis.Methods The fresh isolated neutrophils from healthy adults blood were cultured with Mtb-Ag for 24 h,with or without pretreatment of nuclear factor -?B (NF-?B) inhibitor N-tosyl-L-phenylanyl chloromethyl ketone (TPCK) for 30 minutes.Annexin V staining and Flow cytometry were used to measure cell apoptosis of neutrophils.NF-?B DNA binding was measured by gelelectrophorestic mobility shift assay (EMSA) in neutrophils after incubated with Mtb-Ag for 0,1,2,4,6,24 hours.Results Comparing to the spontaneous apoptosis (55%?6%) of neutrophils after culture in vitro for 24 h,treatment of Mtb-Ag (1.125 mg/ml) decreased the cell apoptosis of neutrophils (32%?3%).The NF-?B shift bands were detected at 1 h in neutrophils after stimulated by Mtb-Ag,and reached maximum peak at 2 hours,and then returned to basal levels within 24 h.Pretreatment of TPCK inhibited the anti-apoptosis role of Mtb-Ag in neutrophils.Conclusion Mtb-Ag prevents neutrophils apoptosis and its inhibitory role concerns NF-?B pathway.

Objective To investigate the relationship between the serum levels of vascular endothelial growth factor(VEGF) and severity and prognosis by evaluating its changes in severe sepsis patients. Method Us-ing control study design, a total of 29 severe sepsis patients who admired in ICU department of Second Hospital of Tianjin Medical University from July 2006 to November 2007 were enrolled. The patients were divided into survival group (n=16) and death group (n=13) according to the clinical outcomes at 28 days after onset.A total of 31 healthy persons were enrolled into the control group. Clinical and laboratory data including blood routine test,blood-gas analysis,blood chemistry,C-reactive protein,lactic acid were collected on the first,third and 7th day after on-set,respectively. APACHE Ⅱ score were calculated. VEGF levels were determined using ELISA method. Quantita-tive data were analyzed by Ftest. Results The VEGFlevels ofthe control groupwere (78.77±8.15) pg/mL, the VEGF levels of the survival group on the first,third and 7th day were (210.47±59.40) pg/mL, (161.79 ±32.58) pg/mL and (85.33±12.13) pg/mL, respectively. The peak value of VEGF levels appeared on the first day, Then,it decreased with the progression of the disease. The VEGF levels did not differ significantly between the control group and survival group on the 7th day (P>0.05). The VEGF levels in the death group on the first, third and 7th day were (324.12±44.35) pg/mL,(185.40±30.92) pg/mLand (273.32±55.23) pg/mL, respectively. The peak value of VEGF levels in the death group also appeared on the first day, but it did not de-crease significandy on the 7 th day as compared that on theist day. The value of VEGF levels on the 7 th day were significantly higher than that of the control group (P<0.01 ). The levels of VEGF were positive correlated with APACHEⅡ score(rs = 0.510,P<0.01), both VEGF levels and APACHEⅡ score were risk factors for the clinical outcomes of these patients. Conclusions The serum levels of VEGF are elevated at early stage in severe sepsis patients. The VEGF levels, which might be a potential prognositic factor for sepsis patients are significantly correlated with APACHE Ⅱ score.

Objective: To determine whether aminoguaidine（AG）,a selective inhibitor of inducible nitric oxide synthase (NOS), affect the embroy development of mice, and to study the mechanisms of iNOS affecting on pregnancy. Methods: AG(10 mg*kg－1*d－1 or 20 mg*kg－1*d－1) were injected subcutaneously to mice from day 3，7，14. kill mice at day19. The weight of fetus and placenta, the number of fetus and fetal resorptions were measured. Histological changes of placenta and umbilical cord were observed. Immunohistochemistry and NADPH histochemistry were adopted to study NOS activity of placental and umbilical cord respectively. Results: The conceptus in the uterus were resorbed in the early pregnancy. In the early and middle pregnancy the weight of pregnant mouse and the number of fetus of AG groups was decreased. The number of fetal resorptions was increased. But the weight of fetus and placenta were not affected. The expression of iNOS in the placenta were no difference significantly between the two groups with image analysis. Conclusion: AG inhibits the implantation and growth of embryo in the early and middle pregnancy, buy doesn't affect the formed fetus and placenta significantly.

BACKGROUND:Stem cel transplantation, in recent years, has become a preferred treatment for premature ovarian failure. Umbilical cord blood mononuclear cel s containing a large number of mesenchymal stem cel s, immature stem/progenitor cel s, and endothelial progenitor cel s can be used as an important source of stem cel transplantation.
OBJECTIVE:To study the therapeutic efficacy of human umbilical cord blood mononuclear cel transplantation on radioactive premature ovarian failure in nude mice.
METHODS:120 female BALB/C nude mice were randomly divided into four groups:blank control group without any intervention;model group, intravenous transplantation group, and in situ transplantation group exposed to 60Coγrays, 0.5 Gry per day, for 30 days. After 30 days, premature ovarian failure models were made in the latter three groups. Then, nude mice in the latter three groups were given bilateral ovary injection of 10 μL DMEM, tail vein injection of 10 μL human umbilical cord blood mononuclear cel s (1×1013/L), and bilateral ovary injection of 10 μL human umbilical cord blood mononuclear cel s (1×1013/L), respectively. Thirty days after cel transplantation, serum levels of estradiol, fol icle hormone, luteinizing hormone, inhibin B and vascular endothelial growth factor were detected, cel apoptosis in the ovary tissue and cel survival were observed pathological y.
RESULTS AND CONCLUSION:After modeling, the serum levels of estradiol, inhibin B and vascular endothelial growth factor were significantly reduced (P<0.01), while fol icle hormone and luteinizing hormone levels increased (P<0.01). After transplantation, these indexes were al improved in the in situ transplantation group (P<0.01), and reduced fol icle hormone and luteinizing hormone levels were visible in the intravenous transplantation group (P<0.05, P<0.01). Compared with the model group, in situ transplantation and intravenous injection of human umbilical cord blood mononuclear cel s could effectively reduce cel apoptosis in the ovary tissue (P<0.05), and transplanted cel s were able to survive in the ovary of nude mice. Al these findings show human umbilical cord blood mononuclear cel transplantation do have curative effects on premature ovarian failure in nude mice through the inhibition of apoptosis and the regulation of hormone secretion.

Objective To evaluate disinfectant efficacy of air disinfector and ultraviolet lamp.Methods Domestic literatures were searched by computer,RevMan 5 .3 software provided by the Cochrane collaboration was used for quantitative analysis,efficacy of two kinds of air disinfection methods was compared. Results A total of 1 1 articles met the inclusion criteria. Because the heterogeneity of literatures,random effects model analysis was adopted, colony forming unit (CFU)before disinfection(WMD= -26.28,95% CI:[-60.31,7.75],P>0.05 )and immediately-after disinfection(WMD= 22.45,95% CI:[-34.24,79.13],P>0.05)had no obvious difference between two methods respectively,but CFU of air disinfector 2 hours after disinfection was significantly less than ultraviolet lamp group(WMD= -345.11,95% CI:[-478.28,-211.94],P<0.05).Conclusion Air disinfector has good continuous disinfection efficacy.

[Objective]To explore the operative method through the trans-upper-sternal approach in the treatment of the cervicothoracic spinal lesions and evaluate its clinical effects.[Method]From August 1999 to February 2006,11 cervicothoracic patients,8 males and 3 females,age ranged from 17 to 77 years with a mean of 41.5 years underwent the trans-uppersternal approach surgical treatment.There were four traumatic lesions,six tumors and one tuberculosis.The lesions were located at T3,C7~T1 and T1、2 in 1 case respectively,C7 and C6~T1 in 2 cases respectively,T1 in 4 cases.The combined cervicothoracic incision and upper sternotomy were performed for the exposure of the vertebral bodies,then tumor or vertebral body was resected,the spinal cord was decompressed,the spinal column was reconstructed and fixed.Neurologic status was assessed using the Frankel classification.[Result]The duration of follow-up ranged from 10 to 56 months with an average of 31 months.One patient developed chyle leakage of 50 ml one day after surgery and the leakage stopped 2 days after continuous drainage.One patient had transient vocal cord paresis which recovered in 3 months.All patients had their neurological improvement at different level.Nonunion or instrument-related complications were not observed,and the vertebral column had good stability.[Conclusion]The trans-upper-sternal approach gives an excellent exposure of the cervicothoracic junction.It is a technically simple,safe and effective method for anterior decompression,maintenance of anatomic alignment,fusion with bone graft and internal fixation with less complications and trauma.Attention should be paid to avoid injury of the recurrent laryngeal nerve and the thoracic duct.

Objective To evaluate the effect of recominant human growth hormone(rhGH) in the prevention and treatment of endotoxemia(ETM) in murine experimental obstructive jaundice (OJ) Methods Twenty OJ rats received subcutaneously given rhGH of 0 75*!IU/kg daily for 2 weeks (rhGH group). Blood endotoxin(ET) was measured, and intestinal mucosa was observed under electron microscope at 5th week.Results In rhGH group, ET level 〔(0 40?0 02)*!EU/ml〕 was significantly lower than OJ rats〔(0 77?0 03)*!EU/ml, n =20〕 ( t = 6 237, P 0 05). Under electron microscope bowel villi in OJ group were distroyed, epithelial cells were degenerated and necrotic, whereas in rhGH group the ultrastructural pathology was much less evident and similar to that in sham operation rats. Conclusion rhGH has significant effect on protecting the injured mucosa barrier in OJ,and decreases ETM significantly.

Objective To investigate the effect of high viral loads(HBV DNA concentration in blood ＞2.0 copy/ml)on the vertical transmission of hepatitis B virus in mothers with HBV DNA positivity.Method Forty pregnant women with HBV DNA positivity were divided randomly.double-blindly into 2 groups:at 28 weeks of pregnancy,one group received oral lamivudine(100 mg/d)and the other received oral placebo.The serum HBV DNA loads were tested at 28 and 40 weeks'gestation in mothers,and serum HBV DNA,HBsAg,HBeAg and anti-HBs were examined in infants at 12 month follow up.Result Thirtynine infants finished(one twins)the follow up,and 2 infants lost(5%).Among them 4 infants were confirmed to be HBV infection(10%,4/39),2 in the treatment group(10%,2/20)and 2 in the control group(11%,2/19)(P＞0.05).The serum HBV DNA levels of 40 weeks'gestation in the treatment group,compared with the levels of 28 weeks'gestation in the treatment group and 40 weeks'gestation in the control group,showed a significant decline(P＜0.01).The HBV DNA levels of the mothers whose infants were infected,were(3.1±3.4) copy/ml,(3.1±3.2) copy/ml during 28 and 40 weeks'gestation,and for mothers whose infants were non-infected,the levels were(3.4±2.2) copy/ml,(2.6±1.5) copy/ml respectively(P＞0.05).The mean values of anti-HBs of 18 infants in the treatment group showed no significant difference as compared to 17 infants in the control group,(594±416)U/L vs (458±398) U/L (P＞0.05).Conclusion The pregnant women's HBV DNA loads could be obviously decreased from high viral loads (HBV DNA concentrations in blood＞2.0 copy/ml)after they take lamivudine from 36 weeks'gestation.But it might not reduce the maternal-fetal vertical transmission of HBV infection.