10.3969/j.issn.2095-4344.2013.25.016

Objective To explore the distribution and characteristics of initial PSA and PSA velocity in men younger than years without prostate cancer. Methods PSA in men younger than 50 years without prostate cancer from January 2001 to November 2009 were retrieved retrospectively from our computer center. PSA velocity was calculated if their PSA was measured twice or more. The distributions of initial PSA and PSA velocity were analyzed. The correlations between initial PSA, initial PSA age, and PSA velo-city were also analyzed. Kaplan-meier and log-rank tests were used to estimate the significant difference at the risk of PSA≥ 2.5 ng/ml after initial PSA measurement, stratified by median initial PSA (0.6 ng/ml). Results A total of 4206 men without prostate cancer were included. The median initial PSA value in these men was 0.6 ng/ml. Of these men, 1026 (24.4%), 177 (4.2%), and 90 (2.1%) had an initial PSA≥1.0, ≥2.5, and ≥4.0 ng/ml, respectively. A total of 417 men had their PSA measured these men, 25 (6.0%), 13 (3.1%), and 8 (1.9%) had a PSA velocity≥0.35, ≥0.75, initial PSA age and initial PSA, initial PSA age and PSA velocity, and initial PSA and PSA velocity (correlation coefficient r=0.019, -0.015, and -0.006, respectively; P=0.218, 0.754, and 0.897, respectively). After a follow-up of up to 7.1 years from baseline PSA measurement, the risk of PSA≥2.5 ng/ml, stratified by median initial PSA (0.6 ng/ml) was significantly different (log-rank test, P＜0.001). Conclusions The median baseline PSA and PSA velocity in men younger than 50 years old without prostate cancer are 0.6 ng/ml and 0.03 cancer with an initial PSA higher than median (0.6 ng/ml) have a subsequently higher risk of PSA value ≥2.5 ng/ml.

Objective To study the calcium metabolism in tacrolimus(FK506)induced rats nephrotoxicity and the preventive effect of calcium channel blocker.Methods Twenty-four Spragueinduced or FK506-induced nephropathy model.Blood creatinine,blood electrolytes,renal tissue histopathology(HE stain)and the change of ultrastructural organization in renal cells by transmission electron microscope were observed.Results The blood creatinine levels of both CsA and FK506 groups [(36.00±2.61)and(34.17±4.54)μmol/L] were significantly higher than those of the FK506+Dilgroup and control group(all P＜0.05).The blood calcium levels of both CsA and FK506 groups (2.00±0.04 and 2.05±0.04 mmol/L) were significantly lower than those of the FK506+Dil group and control group(all P＜0.05).The blood creatinine and calcium levels of FK506+Dil group were not significantly different with those of control group(P＞O.05).Histopathology examination showed cloudy swelling and vacuolization of the renal tubular epithelial cells and intra-cellular mitochondria swelling and vacuolization in the CsA and FK506 groups.However,the pathological changes of the FK506+Dil group were remarkably milder in comparison with the CsA and FK506 groups.Concluum channel blocker,Dil,could prevent the FK506-induced nephrotoxicity.

OBJECTIVETo investigate the clinical feature of a family with hereditary hemorrhagic telangiectasia (HHT), and to study the mutation of its related genes.

METHODSMedical histories of the family were analyzed to detect HHT patients according to the diagnostic criteria. ENG and ALK-1 genes of the proband and her two daughters were analyzed. DNA from the three patients' peripheral blood was extracted. The exons 2-10 and their intron-exon boundaries of ALK1 were amplified with PCR, and then the PCR products were sequenced and analyzed to identify the mutation.

RESULTSThere were 11 people in 41 family members of 4 generations were diagnosed as HHT. The proband and her two daughters suffered from multiple organ damage, the younger daughter appeared only imaging features instead of corresponding clinical symptoms. A missense mutation at the 1321 bp of cDNA (c.1321G>A) was detected in the exon 9 of ALK1, which resulted in valine 441 to methionine replacement in ALK-1 protein (p.Val441Met).

CONCLUSIONA Chinese family with HHT was studied and a missense mutation (c.1321G>A, p.Val441Met) of ALK-1 was discovered. This mutation is the genetic basis of the family with HHT and is reported for the first time in China. This research will not only help to further investigate molecular mechanism of pathogenesis of HTT, but also provide evidences and references for the following gene screening and genetic counseling on HTT family members.

Asian Continental Ancestry Group ; Base Sequence ; China ; Exons ; Genetic Predisposition to Disease ; Humans ; Introns ; Mutation ; Polymerase Chain Reaction ; Telangiectasia, Hereditary Hemorrhagic

Clostridium difficile is an important zoonotic intestinal pathogen, which is widely present in humans and a variety of animals. The ST11 type C. difficile is one of the most widespread and harmful subtypes in the world. As a large country in pig farming, China lacks efficient methods for detecting C. difficile of porcine origin, leaving hidden dangers for the prevention and control of C. difficile. The aim of this study was to develop a specific and sensitive double-antibody sandwich ELISA for the epidemiological investigation of ST11 type C. difficile of porcine origin. Firstly, a 97 kDa receptor binding domain (RBD) was expressed in a prokaryotic host and purified. A hybridoma cell line AE2D3 capable of stably secreting monoclonal antibody targeting the RBD was screened, and the antibody subtype was determined to be IgG2b (κ). Secondly, a double antibody sandwich ELISA method was developed, where the monoclonal antibody targeting the RBD was used as a detection antibody, and the rabbit polyclonal antibody was used as a capture antibody. The chessboard method was used to determine the matching concentration of the capture antibody and the detection antibody, the antigen coating conditions, the blocking conditions, the incubation conditions for detection antibody and samples to be tested, as well as the reaction conditions of HRP-conjugated and reaction conditions of TMB chromogenic solution. The negative cutoff OD₄₅₀ was 0.152, and no cross-reaction with 13 strains of non-ST11 type C. difficile was found. The minimum detection concentration of RBD was 8.83 ng/mL. This specific and sensitive double-antibody sandwich ELISA provides a reliable serological detection method for epidemiological investigation of the ST11 type C. difficile in pig industry.
Animals ; Antibodies, Monoclonal ; Bacterial Proteins/genetics* ; Bacterial Toxins ; Clostridioides difficile ; Enzyme-Linked Immunosorbent Assay ; Hybridomas ; Swine