Identification and functional analyses of antiviral restriction factors in hosts have become hot research topics. Four HIV restriction factors, APOBEC3G, Trim5alpha, Tetherin, and SAMHD1, have been identified in recent years. By encoding auxiliary proteins, lentiviruses can counteract host restriction factors. For example, the auxiliary proteins Vif, Vpu, and Vpx of HIV antagonize APOBEC3G, Tetherin, and SAMHD1, respectively. Furthermore, these auxiliary proteins enable the entry of HIV into host cells and influence the replication and pathogenicity of HIV. In this paper, we review the research progress in the functions of the three HIV auxiliary proteins that can antagonize the host restriction factors.
Animals ; HIV ; metabolism ; physiology ; Host-Pathogen Interactions ; Humans ; Viral Proteins ; metabolism

In order to observe the changes of myotension in the paralyzed limbs after subcutaneous injection(S.C)of capsaicin,we observed the changes of the spontaneous Electromyography(EMG)recorded in the quadriceps femoris before and after T-5 level spinal transection and found that the amplitude of EMG kept a low level in normal rats but increased progressively after operation.After treating the animals with capsaicin 200mg/kg(S.C)in three consecutive days,we found a much lower spontaneous EMG and a much higher pain threshold than that of the controls.Radioimmunnoassay detected that the content of SP in spinal dorsal horn was reduced by 38.4%,the general condition did not severely changed during the experiment.The results indicate that SP in the spinal dorsal horn participates in the regulation of myotension,and it is suggested that subcutancous injection of capsaicin may be one effective treatment to reduce the hypermyotension in the paralyzed limbs.

Objective To determine the expression of Toll-like receptor 5(TLR5) mRNA in the lung tissues of rats with acute lung injury induced by flagellin, and to investigate its potential role in the pathogenesis of the disease. Methods Flagellin was isolated and purified from Escherichia coli ATCC25922, subsequently identified by monoclonal antibody to flagellin. One hundred and eight SD rats were randomly divided into control group (n=36), flagellin challenged 1 group (n=36) and flagellin challenged 2 group (n=36). Rat model of ALI was reproduced by injecting flagellin. The expression of TLR5 mRNA in the lung tissues of rats was determined with in situ hybridization technique at six time points. Blood gas was monitored and pathological changes in the lung was observed at the same time. Result Flagellin was isolated and purified successfully and its molecular weight was approximately 65kD. Flagellin-induced acute lung injury model was successfully reproduced in rats. From 1h after flagellin injection, TLR5 mRNA expression was found to be increased in the lung tissues of rats with flagellin induced acute lung injury, and the expression was on the increase with the elapse of time and increase of the dose of flagellin. The PaO_2 levels in flagellin challenged 1 and 2 groups decreased. Interstitial edema, alveolar edema and inflammatory cells infiltration were also observed in flagellin challenged groups. Conclusion Flagellin can induce ALI in rats; the development of flagellin induced ALI in rats is related with TLR5 expression in the lung tissues of rats.

Objective To evaluate a minimally invasive procedure for intertrochanteric fracture treatment in elderly patients. Methods Total 46 elderly patients with intertrochanteric fracture were treated with a minimally invasive procedure from September 2008 to February 2010. The fractures were fixed with multiple K-wires combined with skeletal traction through supracondyle of femur. All procedures were undertaken under local anesthesia. Results All the patients were followed up for 8.8-months in average, and 42 patients recovered with independent walking, and the good rates was 91.3%, without severe complications in this group. Conclusions Minimally invasive procedure including fixation with multiple K-wires combined with traction through femoral supracondyle, is a safe and effective treatment for intertrochanteric fracture in elderly patients, avoiding high risks of intra-and post-operative complications.

Objective To explore the effects of repetitive transcranial magnetic stimulation (rTMS) on cognitive ability of patients after ischemic stroke. Methods 45 patients with mild cognitive impairment (MCI) after ischemic stroke were randomly assigned into control group (n=22) and observation group (n=23). Both groups received routine drugs and cognitive training. The observation group received rTMS over the left dorsolateral prefrontal cortex (DLPFC) (5 Hz, 80% motor threshold) in addition for 4 weeks. Results The score of Montreal Cognitive Assessment (MoCA), P300 latencies and amplitudes improved after treatment in both groups (P<0.001), and were better in the observation group than in the control group (P<0.05). The MoCA score was negatively related with P300 latency (r=-0.851, P<0.05). There was no severe adverse effect during the treatment. Conclusion rTMS could improve the cognitive ability of patients with MCI after stroke, with little side effect.

Objective To investigate the effects of transforming growth factorβ1(TGFβ1)and β3 (TGFβ3)gene transfer on MMP-2,MMP-9 and TIMP-1 expression in hepatic stellate cells(HSC-T6).Methods TGFβ1 and TGFβ3 expression plagmids were constructed.The recombinant expression plasmid pcDNA3.1(+)-=TGFβ1 and pcDNA3.1(+).TGFβ3 were transfected or cotransfected into HSC-T6.At 24,48 and 72 h after transfection,the expression of MMP-2,MMP-9 and TIMP-1 mRNA were detected by real-time quantitative PCR,and the expression of MMP-2,MMP-9 and TIMP-1 protein were detected by Western blot.The recombinant expression plasmid pcDNA3.1(+).TGFβ1 was transfected into HSC-T6,and positive clones were selected by G418.The positive clones were transfected by the recombinant expression plasmid pcDNA3.1(+).TGFβ1,and the expression of MMP-2,MMP-9 and TIMP-1 were detected at 48 h after transfection.Results After transfection with peDNA3.1-TGFβ1,MMP-2 and TIMP-1 increaged remarkably in HSC-T6 cells(P＜0.05),but MMP-9 remained at the sanle level;After transfection with pcDNA3.1-TGFβ3,expression levels of MMP-2,MMP-9 and TIMP-1 mRNA were not changed,but TIMP-1 protein increased remarkably(P＜0.05);in cotransfection group,the expression of MMP-2 was higher than that in the blank and the control groups(P＜0.05),but MMP-9 level was not changed and TIMP-1was decreased compared with that in the TGF-β1 transfection group(P＜0.05).After TGFβ3was transfected into positive clones,the change of MMP-2 wag not significant(P＞0.05).but MMP-9 increaged and TIMP-1 decreased significantly at 48 h after transfection(P＜0.05).Conclusions TGFB3 may inhibit liver fibrosis by increase the activity of MMP-2 and MMP-9,and decrease the activity of TIMP-1.

Animals ; Benzodiazepines ; pharmacology ; Ducks ; physiology ; Growth Hormone ; blood ; Insulin-Like Growth Factor I ; metabolism ; Serum ; metabolism ; Weight Gain ; drug effects

Chlorine ; Computer Simulation ; Computers, Analog ; Diffusion ; Software