HIV/AIDS has become one of the principal factors which seriously threatened the security of the human race since 80s,which draw worldwide attention.Given that Southern Africa is at present generally believed to be the epicenter of this pandemic,HIV/AIDS has come to represent an unprecedented threat to the human security of the region's states in particular.The article analyses the causes,and attributes the phenomenon to such factors as poor public health sector,the impacts of SAPs,the backward tradition and superstition,stigmatization,status of women and the adverse effect of urbanization.

Neuronal apoptosis is one of the important forms of neuronal death in ischemic stroke.N-methyl-D-aspartate (NMDA) receptor-mediated excitatory amino acid toxicity plays an important role in neuronal apoptosis. It is the initiator and executor of apoptosis in neuronal cells. NR2B is the major regulatory subunit of this receptor, its transmembrane segment M2 is a reflexed membrane loop region facing cytoplast toward intramembrane, forming the inner wall of ion channel, which determines the permeability of the NMDA receptor ion channel to calcium. Glutamate mediates cell injury mainly through calcium overload, therefore, NR2B subunit plays a vital role in the neuronal apoptosis in ischemic stroke.

Objective:To explore if there was a correlation between TNFAIP8 and gastric tumor drug resistance. Methods:We collected 47 cases of neoadjuvant chemotherapy,and detected the expression of TNFAIP8 in their tissues before and after surgery by im-munohistochemistry. Compared the expression of TNFAIP8 between SGC7901 cell and its cisplatin resistance cell SGC7901-DDP by Western blot,and then we used siRNA technology to decreased its expression,continued to test the susceptibility to cisplatin through MTT. Results:The expression of TNFAIP8 between pre-neoadjuvant and after-neoadjuvant had no difference, but the expression of chemotherapy effectiveness was lower than chemotherapy invalidness(P<0. 05);the expression of SGC7901-DDP cell was also higher than SGC7901 cell; the expression of TNFAIP8 decreased apparently through plasmid transfection of SGC7901-DDP cell, MTT test showed the fewer expression of TNFAIP8 could increase the susceptibility to cisplatin(P<0. 05). Conclusion: TNFAIP8 was involved in chemotherapy resistance of gastric carcinoma.

Objective To observe the clinical effect of early diabetic nephrosis treated with Danhong injection and Losar- tan Potassium Tablets.Methods 60 patients were randomly divided into treatment group (n=30) and control group (n=30).Both grougs take orally medicine or insulin for normal blood sugar,the control group were treated with con- ventional treatment.On the basis of conventional treatment,the treatment group were treated with Danhong injection and Losartan Potassium.Results After treated for 28 days,the UAER,BUN,SCr and hemorheology were significantly improved in the treatment group than in the control group (P

Objective To investigate the role of cyclooxygenase 2 (COX 2) in the forming of portal hypertension and whether a selective COX 2 inhibitor can reduce the portal hypertension or not. Methods Cirrhotic Sprague Dawley rat was induced by carbon tetrachloride (CCl 4) intraperitoneally for 8 weeks. The animals were divided into three groups: 10 normal rats served as control group; the other 15 rats, which received CCl 4 intraperitoneally twice a week and rofecoxib (10 mg/kg) by gavages daily, served as treatment group; another 15 rats, which were induced cirrhosis by CCl 4 but given placebo (saline solution ) instead of rofecoxib, served as placebo group. After 8 weeks of CCl 4 induction, portal pressure was measured, and the levels of thromboxane B 2 (TXB 2), and prostaglandin (PG)E 2 in the liver tissues were determined by enzyme immunoassay. Furthermore, liver histopathological analysis was performed in H E and Masson's trichrome staining sections. Results Portal pressure in the rats of rofecoxib group was significantly decreased compared to that in the placebo group [(11.95?1.05) mm Hg vs. (13.45?1.15) mm Hg; P

Objective To investigate the role of cyclooxygenase-2 (COX-2) in sinusoidal capillarization in liver cirrhotic rats. Methods The SD rats were intraperitoneally injected with carbon tetrachloride (CCl4) twice a week for 8 weeks to induce liver cirrhosis. The rats were randomly divided into three groups: normal control group (n= 10), model control group (n= 15) and rofecoxib treated group (received 10 mg/kg of rofecoxib daily, n = 15). Liver histopathology was examined by light microscopy, and sinusoidal ultrastructure was observed by transmission electron microscopy. Furthermore, the level of basement membrane proteins (collagen type Ⅳ, laminin) and their localizations in liver were determined by Western blotting and immunohistochemistry, respectively, and the microvessel density was detected following vWF (yon Willebrand factor) immunolabeling on liver tissue sections. Results Fibrotic areas were reduced in rofecoxib treated group compared with that in model group (30.7±8.9 vs 23.5±6.5,P<0. 05). The light and electron microscopy showed that the pathologic changes including loss or reduction in number of sinusoidal endothelial fenestrate, the accumulation of extracellular matrix in the Disse's space and development of subendothelial basal lamina (basement membrane formation) were more severe in model group than those in rofecoxib treated group. Compared with model group, administration of rofecoxib resulted in significant decrease in microvessel density (11.3 ± 1.6 vs. 6.4 ±0. 7, P<0. 01). Rofecoxib could significantly decrease the expression of type Ⅳ collagen and laminin at protein levels (3.0±0.5 and 3.0±0.5, respectively) when compared with model group (3.8±0.4 and 3.7±0. 5, respectively). Conclusion The results indicate that early administration of rofecoxib may reduce sinusoidal capillarization.

Objective　 To investigate the causes and therapy　of inflammatory abdominal mass after appendectomy.　 Methods　21 cases with inflammatory abdominal mass after appendectomy, which were diagnosed and treated in our hospital from 1980 to 1998, were retrospectively analyzed.　 Results　Of 21 cases, 17 were male, 4 were female. Follow-up of 3 months to 2 years found no recurrence among the 13 cases receiving medical therapy. 8 cases underwent surgical excision (4 of which had been preoperatively misdiagnosed as carcinoma or tuberculosis) with pathology-proved diagnosis of inflammatory mass.　Conclusions　Afflicting mainly male youths, this disease is a kind of local chronic inflammatory hyperplastic entity, which subsides by medical therapy. Surgery is only indicated in cases when carcinoma or tuberculosis could not be excluded.

Objective　To study the effect of gadolinium chl oride hexahydrate (GDCL3) on the structure and lipid peroxide (LPO) of rat hep atocellular mitochondria during liver cold ischemia storage. 　Methods　Forty Wistar rats were randomized into 8 gr oups ( 5 in each group). Group 1～4 served as control. The other 4 groups were p retreated with GDCL3 (7mg/kg). The ultrastructures of hepatocellular mitocho ndria were observed by electron microscope and LPO of hepatocellular mitochondri a were investigated. 　Results　LPO o f hepatocellular mitochondria in group 1h, 2h, 3h pretreated with GDCL3 for 1、 2、 3 h were 1.0±0.3、1.7±0.2、2.0±1.0, LPO was suppressed sign ificantly compared with control group (2.2±1.0、2.8±1.0、3.5±1.0、 P<0.05). With time prclonging of liver storage, the damage of hepatocellular mitochondria ultrastructure became more severe and LPO of hepatocellular mitoch ondria increased significantly. Pretreated with GDCL3, the damage of hepatocel lular mitochondria ultrastructures were lessened and the elevation of LPO was s uppressed significantly (1 hour、 2 hours、3 hours，P<0.05). 　Conclusion　Mitochondria damage is one of the sensitive characters of liver cold ischemia injury, GDCL3 inhibits rat hepatoc ellular injury during liver cold ischemia storage.

Objective To investigate the causes and therapy of inflammatory abdominal mass after appendectomy.Methods21 cases with inflammatory abdominal mass after appendectomy, which were diagnosed and treated in our hospital from 1980 to 1998, were retrospectively analyzed. Results Of 21 cases, 17 were male, 4 were female. Follow up of 3 months to 2 years found no recurrence among the 13 cases receiving medical therapy. 8 cases underwent surgical excision (4 of which had been preoperatively misdiagnosed as carcinoma or tuberculosis) with pathology proved diagnosis of inflammatory mass.[WT5”HZ]Conclusions Afflicting mainly male youths, this disease is a kind of local chronic inflammatory hyperplastic entity, which subsides by medical therapy. Surgery is only indicated in cases when carcinoma or tuberculosis could not be excluded.

Cyclooxygenase is the key enzymes mediating prostaglandings release. In recent years, two isoforms of cyclooxygenase, a constitutive cyclooxygenase(COX-1)and an inducible cyclooxygenase (COX-2),have been identified, from which people have known more about gastrointestinal pathophysiology. This article is a review of COX-1 and COX-2 on the distribution, inducement and regulation in gastrointestinal tract and its relation to programmed cell death, tumor, ulcer and Crohn's disease.