OBJECTIVE:To optimize the extraction technology of polysaccharides from antlion and explore its effect on im-mune functions of mice. METHODS:Using content of polysaccharides as investigation index,the effects of extracting polysaccha-rides from antlion by water extraction method protease hydrolysis extraction(optimized by orthogonal test using extraction tempera-ture,enzyme dosage,extraction time as indexes),and diluted alkali extraction(optimized by orthogonal test using alkali concentra-tion,extraction temperature,extraction time as indexes)were compared. 128 KM mice were randomly divided into 4 groups,then randomly divided into control group(normal saline),polysaccharides low-dose,medium-dose,high-dose groups(20,40,80 mg/kg),8 in each group,iv in tail vein,0.2 mL/10 g,once a day,for 1 week,which were respectively used to determine the phago-cytosis percentage and phagocytic index of peritoneal macrophages,spleen and thymus index,lymphocyte transformation rate and serum hemolysin levels. RESULTS:The contents of polysaccharides by 3 methods were 14.48%,38.66%,30.62%,respectively. The content of polysaccharides by protease hydrolysis extraction was the highest,the optimal extraction technology were as follows as using 100 μg/g papain extracting 3 h under 40 ℃. Compared with control group,phagocytosis percentage,phagocytic index, spleen index in polysaccharides low-dose,medium-dose,high-dose groups were significantly increased (P<0.05),thymus index was significantly decreased(P<0.05),while lymphocyte transformation rate had no significant changes(P>0.05);serum hemoly-sin in polysaccharides medium-dose group was significantly increased (P<0.05). CONCLUSIONS:Protease hydrolysis extraction is suitable for the extraction of polysaccharides from antlion,the optimal technology is reliable. Polysaccharides from antlion show activity in enhancing mice non-specific immunity and humoral immunity.

OBJECTIVE To understand mecA gene distribution in Staphylococcus aureus and its role in antibiotics-resistance.METHODS In this study,a total of 47 S.aureus strains were isolated from hospitalized patients.Agar disk diffusion test was conducted to determine the resistance of S.aureus to antibiotics.The DNA of these strains were extracted and purified.The mecA gene was tested by PCR and the relation between the mecA gene and antibiotics-resistance was analyzed.RESULTS Of 47 strains,33(70.2%) were MRSA.Of 33 MRSA,only 3 strains were susceptible to glycopeptides antibiotics.Only 2 strains(14.3%) of 14 MSSA were susceptible to all of the 12 antibotics.The results of PCR revealed that 32 out of 33 MRSA(97.0%) carried mecA in their genome.One strain was mecA gene negative.Among 14 MSSA,3(21.4%)strains carried mecA gene.CONCLUSIONS The isolation rate of MRSA in S.aureus is high.The resistance to antibiotics of MRSA is popular Glycopeptides antibiotics.Most of MRSA carry mecA gene,which plays an important role in antibiotics-resistance.Fewer MSSA carry mecA gene.

0.05).EBV-specific IgM was detected more frequently in patients than that in controls(P

Objective To investigate the effect of an ACE inhibitor ,perindopril ,on the expression of SR‐A in renal tubuloint‐erstitium of diabetic rats .Methods Diabetes was induced in male Sprague‐Dawley rats by injection with streptozotocin .The rats were then randomly divided into 3 groups:normal control group;untreated diabetes mellitus group and diabetes mellitus group trea‐ted with perindopril .After a 24‐week treatment ,tubulointerstitial injury index was assessed with Masson′s trichrome sections .The expression of SR‐A mRNA was detected by RT‐PCR and the expression of SR‐A protein in renal tubulointerstitium was detected by immunohistochemistry .Results The tubulointerstitial injury index ,the expression of SR‐A mRNA were significantly higher in the diabetes group than those in normal control group .Perindopril treatment not only attenuated the tubulointerstitial injury ,but also reduced the overexpression of SR‐A mRNA in diabetic rats .The expression of SR‐A protein was most obvious in renal tubulointer‐stitium in diabetic rats ,which was obviously attenuated by perindopril treatment(P<0 .05) .Conclusion The findings of the this study indicate that perindopril may have renoprotective effects on diabetic nephropathy via inhibiting the expression of SR‐A in re‐nal tubulointerstitium .

OBJECTIVETo investigate HIV infection status and its influence factors in men who have sex with men (MSM) in Sichuan province.

METHODSA face to face investigation and Syphilis and HIV serological detection were conducted among 2 783 MSM who have the insertion of oral or anal sex with men over the past year recruited by snowball sampling and respondent driven sampling methods in nine cities' Gay venues of Sichuan province. χ(2) test and logistic regression analysis were used for statistical analysis.

RESULTSA total of 2 783 MSM were surveyed, of which HIV and Syphilis infection rates were 11.1% (147/2 783) , 5.3% (310/2 783) , respectively. The HIV infection rates of <20 year-old age group, 20-29 year-old age group, 30-39 year-old age group, 40-49 year-old age group, ≥ 50 year-old age group were 6.6% (15/227), 9.7% (143/1 471), 11.8% (80/679), 18.0% (53/294), 17.0% (19/112) (χ(2) = 25.91, P < 0.05). The risk of HIV infection in 30-39 year-old age group, 40-50 year-old age group,> 50 years age group were 2.05 (1.14-3.69) times, 3.24 (1.75-6.01) times, 2.60 (1.22-5.52) times respectively of the <20 years age group. The risk of HIV infection in middle school and below one was 16.5% (73/443) , higher than the high school/college education MSM (11.1% (99/891) ) and the college and higher education MSM (9.5% (138/1 446)) (χ(2) = 16.46, P < 0.05). The risk of HIV infection in High school/college education MSM were 0.64 (0.45-0.90) times of the middle school and below. The HIV infection rates of MSM who accepted a HIV test and knew the result within the last year was 8.2% (119/1 446) , lower than the group who did not accepted any HIV test (14.3% (191/1 336) ) (χ(2) = 25.81, P < 0.05). The HIV infection rates of MSM who received intervention services was 10.1% (256/2 539), lower than the group who did not receive any intervention services (22.1% (54/244) ) (χ(2) = 32.65, P < 0.05) . The HIV infection rates of Syphilis-positive MSM was 32.0% (47/147) , higher than the Syphilis-negative one (10.0% (263/2 636) ) (χ(2) = 68.06, P < 0.05). Received intervention services (OR (95%CI) was 0.52 (0.40-0.68) ) and accepted a HIV test and knew the result within the last year (OR (95%CI) was 0.52 (0.36-0.74) ) were the protective factors of HIV infection. At the same time, the syphilis infection (OR (95%CI) was 4.01 (2.73-5.88) ) were risk factors for HIV infection.

CONCLUSIONThe prevalence rates of HIV infections were considered to be high among MSM in Sichuan province. The MSM of low-literacy, 30 years or older, not received any intervention services, not received any intervention services.Syphilis-positive have a greater risk of HIV infection.

Adolescent ; Adult ; China ; Data Collection ; Demography ; HIV Infections ; HIV Seropositivity ; Homosexuality, Male ; Humans ; Male ; Middle Aged ; Prevalence ; Risk Factors ; Sexual Behavior ; Surveys and Questionnaires ; Syphilis

Objective:To assess the early physical growth and development of human immunodeficiency virus-exposed uninfected (HEU) children by longitudinally comparing the differences of growth and development between HEU group and the healthy human immunodeficiency virus-unexposed uninfected (HUU) control group of children aged 0 to 18 months.Methods:A retrospective cohort study was designed.Maternal information of the human immunodeficiency virus (HIV) infected mothers and follow-up information at 0, 1, 3, 6, 9, 12, and 18 months postpartum of their children (born between January 2013 and December 2019 in Chengdu City) were collected from the Information System of Prevention of Mother-to-Child Transmission of Human Immunodeficiency Virus Management. The HUU control group was matched with HEU group by maternal age, gestational age at birth, and infant gender at a ratio of 1∶1. There were 385 children each included in the HEU and HUU groups. Matched samples t-test and the multilevel models were used to compared the physical developmental differences between the two groups. Results:Weight for age Z scores (WAZ) at 0, 3, 6 months of HEU group were -0.72±1.03, -0.09±1.18 and 0.05±1.09, respectively, which were all lower than WAZ of HUU group (-0.21±1.04, 0.42±1.19 and 0.41±1.16, respectively), which were all significantly different ( t=8.41, 7.47 and 5.18, respectively, all P<0.001). Length for age Z scores (LAZ) at 3, 6, 12, 18 months of HEU group were -0.23±1.36, -0.01±1.48, -0.18±1.20 and -0.32±1.13, respectively, which were all lower than LAZ of HUU group (0.24±1.26, 0.30±1.26, 0.07±1.11 and 0.04±1.05, respectively), which were all significantly different ( t=6.14, 4.04, 2.72 and 4.30, respectively, all P<0.01). Weight for length Z scores (WLZ) at 0, 3, 6 months of HEU group were -1.05±1.18, 0.23±1.03 and 0.22±0.95, respectively, which were all lower than WLZ of HUU group (-0.20±0.98, 0.44±1.03 and 0.45±1.00, respectively), which were all significantly different ( t=10.90, 2.95 and 2.96, respectively, all P<0.01). After possible confounding factors were corrected, the WAZ of HEU children at 0, 3, 6 months were still lower than those of HUU children, the LAZ of 3, 6, 12, 18 months were still lower than those of HUU children, and the WLZ of 0, 3, 6 months were still lower than those of HUU children. Conclusions:The differences between HEU and HUU children in Chengdu City mainly occur within six months of age, but the differences of body length persist until 18 months of age.Prenatal exposure to HIV infection affects both fetal and postnatal body growth and development.