Objective To observe barrier function changes of gut mucosa in rats with acute respiratory distress syndrome(ARDS)．Methods Forty SD rats were randomized to an experiment group (n：30)and a control group(n=10)．Oleic acid was injected via vena femoralis to establish ARDS ratmode1．Subgroups in the experiment group were randomly divided by time 30 min，2 h，4 h interval after injection(n=10 in each subgroup)．Concentration of D-lactate and endotoxin and activity of diamineoxidase in blood plasma were measured．Histopathological changes of small intestine were observed under light microscope．Results Compared with the control group，the activation of diamine oxidase in the experiment group was higher after 30 min of injection(Plt;0.01)．Concentration of D-lactate，the activity ofdiamine oxidase and endotoxin level in the experiment group were all elevated after 2 hours of injection(all Plt;0.05)，and further elevated after 4 hours．In the rats’villous interstitial after 2 hours of the injection，there were edema，hyperemia，and infiltration of neutrophils，eosinophils and lymphocytes．After 4 hours ofthe injection，the villous epithelium showed desquamation，necrosis，denaturalization and erosion，associated with infihration of lymphocytes and neutrophils in the mucosa．Conclusion In oleic acid-induced ARDS．permeability of gut mueosa increases and gut barrier is dysfunctional．
Objective To explore the diagnosis and surgical treatment of tarsometatarsal joint complex injuries. Methods Between January 2000 and October 2009, 24 cases of tarsometatarsal joint complex injuries were treated. There were 14 males and 10 females with an average age of 38 years (range, 21-65 years). Injury was caused by a machine in 8 cases,by traffic accident in 12 cases, and by fall ing from height in 4 cases. All fractures were closed. The time from injury tohospital ization was 2-17 hours (5 hours on average). Open reduction and internal fixation with screw were performed. Results Incision healed by first intention in other patients except 1 patient who had effusion at incision. Twenty-three cases were followed up 12-47 months with an average of 23 months. X-ray films showed that all fractures healed after 9-15 weeks of operation (13 weeks on average). No compl ication was found, such as osteofacial compartment sydrome, nonunion infection, loosening or breakage of the internal fixator. According to Maryland scoring, the results were excellent in 7 cases, good in 8 cases, fair in 5 cases, and poor in 3 cases with an excellent and good rate of 65.2%. Conclusion Anatomical reduction and stable fixation are important for satisfying results in treating tarsometatarsal joint complex injuries.
Objective To study the role of ubiquitin-proteasome pathway in diaphragm of COPD rats. Mathods Thirty rats were divided into a normal control group and a COPD group. COPD model was established by exposure to cigarette smoke for three months. The protein levels of E2-14k and proteasome subunit C8 in diaphragms were measured by Western blot. The mRNA levels of ubiquitin and proteasome subunit C2 in diaphragms were measured bymeans of realtime polymerase chain reaction( RT-PCR) . Results Compared with the control group, the protein expression of E2-14k increased significantly in the COPD group ( 0. 81 ±0. 28 vs 0. 50 ±0. 25, P lt;0. 05) , but C8 protein level was not significantly different between the two groups( P gt;0. 05) . The mRNA expression of ubiquitin increased significantly in the COPD group( 0. 89 ±0. 20 vs 0. 50 ±0. 15, P lt;0. 05) , but C2 mRNA level was not significantly different between the two groups ( P gt; 0. 05 ) . Conclusions The mRNA and protein expressions of ubiquitin-proteasome pathway in diaphragmincreased significantly in COPD rats, suggesting that the activity of ubiquitin-proteasome pathwayincreased, which lead to an increase of protein degradation.