OBJECTIVE: To investigate the variation of neurotrophic factors expression in spinal cord and muscle after root avulsion of brachial plexus. METHODS: Forty-eight Wistar rats were involved in this study and according to the observing time in 1st day, 1st week, 4th week, 8th week, and 12th week after avulsion, and the control, were divided into 6 groups. By immunohistochemical and hybridization in situ assays, the expression of nerve growth factor (NGF) on muscle, basic fibroblast growth factor(bFGF) and its mRNA on the neurons of corresponding spinal cord was detected. Computer image analysis system was used to calculate the result. RESULTS: After the root avulsion of brachial plexus occurred, expression of NGF increased and reached to the peak at the 1st day. It subsided subsequently but was still higher than normal control until the 12th week. While expression of bFGF and its mRNA increased in the neurons of spinal cord and reached to the peak at the 1st week. Then it dropped down and at the 12th week it turned lower than normal control. CONCLUSION: After root avulsion of brachial plexus, neurotrophic factors expression increase on target muscle and neurons of corresponding spinal cord. It maybe the autoregulation and may protect neuron and improve nerve regeneration.
Objective To investigate the expressions of insulin like growth factor binding protein -3 （ IGFBP-3 ） in serum and bronchoalveolar lavagae fluids （ BALF ） of patients with non-small cell lung cancer ， and explore the clinical significance in dignosis and prognosis of lung cancer.Methods The bronchoalveolar lavagae fluids （ BALF ） were collected by bronchoscopy in 80 cases with non-small cell lung cancer and 14 healthy subjects.The expression of IGFBP-3 in serum and BALF were detected by immunoradioassay.Results The expression of IGFBP-3 in serum and BALF of lung cancer group were significantly lower than that of health group（Plt;0.05）.IGFBP-3 levels were significantly lower in those patients with lymphoid node metastasis or metastasis or TNMⅢ-TNMⅣ than those without metastasis or TNMⅠ-TNMⅡ（Plt;0.05）.In lung cancer group，the levels of the IGFBP-3 in serum and BALF had a significantly positive correlation（r=0.415，r=0.355，Plt;0.01）.Conclusion The IGFBP-3 may play an important role in the development of non-small cell lung cancer and is valuable in dignosis and prognosis of lung cancer.
Objective To explore the protective effect of rapamycin on brain tissues injury in severe acute pancreatitis (SAP) and its possible mechanism in experimental rats. Methods Ninety SPF males SD rats were randomly divided into 3 groups by random envelope opening method: sham operation group (SO group), SAP group, and rapamycin group (RAPA group), then the rats of each group were divided into 24 h, 36 h, and 48 h 3 subgroups by random number table method. Rats in each group underwent laparotomy, the model was prepared by retrograde injection of solutions into biliopancreatic duct, rat of the SO group was injected with 0.9% normal saline (2 mL/kg), rats of the SAP group and the RAPA group were injected with 5% sodium taurocholate solution (2 mL/kg), but rat of the RAPA group was injected with rapamycin (1 mg/kg) at 30 min before narcosis. All survival rats in each subgroup were killed at 24 h, 36 h, and 48 h respectively, then the pancreas and brain tissues of rats were collected, pancreas and brain tissues were stained by hematoxylin-eosin staining, brain tissues were stained by Luxol fast blue additionally, pathological changes of brain tissues were scored under light microscope. The protective effect of rapamycin on brain tissues injury was determined by comparing the differences in the degree of brain tissues among 3 groups. The phosphorylated mammaliantarget of rapamycin (p-mTOR) and phosphorylated ribosomal 40S small subunitS6 protein kinase (p-S6K1) expression levels in brain tissues were detected by Western blot. In addition, the correlations between the expression levels of p-mTOR and p-S6K1 in brain tissues and the degree of brain tissues injury were analyzed to further explore the possible mechanism of rapamycin’s protective effect on brain tissues injury in SAP. Results① At the point of 24 h, 36 h, and 48 h, the order of the relative expression levels of p-mTOR and p-S6K1 in brain tissues of three groups were all as follows: the SO group < the RAPA group < the SAP group (P<0.05). ② At the point of 24 h, 36 h, and 48 h, the order of brain histological score in three groups were all as follows: the SO group < the RAPA group < the SAP group (P<0.05). ③ The relative expression levels of p-mTOR and p-S6K1 in brain tissues were positively correlated with pathological scores of brain tissues (r=0.99, P<0.01; r=0.97, P<0.01). ConclusionRapamycin plays a protective role in pancreatic brain tissues injure by down-regulating the expression levels of p-mTOR and p-S6K1 in mTOR signaling pathway.
Objective To investigate the distribution and antibiotic resistance of pathogens isolated fromlower respiratory tract in mechanically ventilated patients with acute exacerbation of chronic obstructive pulmonary disease ( AECOPD) . Methods The patients with AECOPD, who were hospitalized in RICU from January 2008 to November 2009, were divided into a community infection group and a nosocomial infection group. Lower respiratory tract isolates were collected by bronchoscopic protected specimen brush for bacterial identification and susceptibility test. Results 134 cases were enrolled in the study, with 75 cases in thecommunity infection group and 59 cases in the nosocomial infection group. The positive detection rate in the nosocomial infection group was significantly higher than that in the community infection group [ 81. 4%( 48/59) vs. 54. 7% ( 41/75) ] . In the community infection group, 49 strains were isolated, in which gramnegativebacteria, gram-positive bacteria, and fungi accounted for 55. 1% , 28. 6% , and 16. 3% , respectively.In the nosocomial infection group, 55 strains were isolated, in which gram-negative bacteria, gram-positive bacteria, and fungi accounted for 61. 8% , 21. 8% , and 16. 4%, respectively. There was no significant difference in the microbial distribution between the two groups ( P gt; 0. 05) . The detection rate of ESBLs producing strains in the nosocomial infection group was significantly higher than that in the community infection group ( 58. 8% vs. 37% ) . The resistance rates in the nosocomial groups were higher than those in the community infection group. Conclusions Antibiotic resistance is serious in mechanically ventilated patients with AECOPD, especially in the nosocomial infection patients. The increased fungi infection and drug resistance warrant clinicians to pay more attention to rational use of antibiotics, and take effective control measures.
Objective To investigate the effects of ginkgo biloba extract （GBE） on expressions of IL-1β, IL-6,and TNF-α in the pancreas and brain tissues of rats with severe acute pancreatitis （SAP）, and further to explore the pathogenesis of SAP and the efficacy of GBE on brain injury. Methods Fifty-four Winstar rats were randomly divided into normal control group, model group, and treatment group, with 18 rats for each group. For rats in the normal control group, only conversion of pancreas was performed by abdomen opening , followed by wound closure immediately. For rats in the model group and treatment group, 5% sodium taurocholate hydrate were injected under pancreatic capsule to establish SAP model, and then GBE and normal saline were infected into intra-abdomen repeatedly every 8 hours, respectively. At 6 h, 12 h, and 24 h after the model establishment, experimental samples were extracted and serum amylase was detected. Pathogenic scoring for pancreas tissues was performed under light microscopy, and immunohistochemistry method was employed to detect the expression levels of IL-1β, IL-6, and TNF-α in pancreas and brain tissues. Results For the treatment group, both serum amylase and pancreas scoring were significantly lower than those of the model group （P＜0.01）. At 24 h after model establishment, the expressions of IL-1β, IL-6, and TNF-α of pancreas tissues in model group were significantly higher than those at 6 h and 12 h （P＜0.05 or P＜0.01）, but no significant differences wereobserved in treatment group （P＞0.05）. The expressions of IL-1β, IL-6, and TNF-α of brain tissues in model group were significantly higher than those at 6 h and 12 h （P＜0.05 or P＜0.01）, but in treatment group decreased （P＜0.05 or P＜0.01）. The expressions of IL-1β, IL-6, and TNF-α in the treatment group were significantly lower than those of the model group at same time （P＜0.01）. Conclusions During SAP, the expressions of IL-1β, IL-6 and TNF-α in pancreas and brain tissues increased obviously. GBE showed suppressing and scavenging effects on IL-1β, IL-6 and TNF-α in pancreas and brain tissues.