This paper reviews the recent advances in recombinant expression and purification of defensins, including the choice of host cells, vectors and expression strategies in prokaryotic and eukaryotic cell ex- pression systems, as well as the status of purification processes. By summarizing the problems existed in the production and clinical applications of defensins, the authors here also pointed out the research directions for defensins, and conceived the prospects for its exploitation in the future.

Objective　To investigate the effects of glucagon-like peptide 2 (GLP-2) on recovery of small intestinal epithelia from radiation injury in mice. Methods　Mice received a single 8 Gy dose of total body irradiation from 60Co gamma ray followed by treatment with GLP-2 or vehicle. DNA and protein content in small intestinal mucosa were measured, and small intestine was processed for histological examination with light microscope and scanning electron microscope. Results　Small intestinal mucosal DNA and protein content, villus height, and villus number significantly decreased in irradiated mice, partial villus tips were ulcerated. GLP-2 administration caused increase in DNA and protein content, villus height, and villus number as compared with irradiated control group. Meanwhile, the villus tips were lack of ulceration. Conclusion　GLP-2 can promote recovery of small intestinal epithelia from radiation injury in mice.

Objective　To study the effect of glucagon-like peptide 2 (GLP-2) on mitogen-activated protein kinase (MAPK) activity in small intestinal epithelia in mice after radiation injury and its relation with the change of small intestinal epithelial proliferation. Methods　Mice were given a single dose of 8 Gy of total body 60Co gamma irradiation and then divided into GLP-2 and control groups. The activity of MAPK and proliferation rate in small intestinal epithelia were measured. Results　The activity of MAPK in small intestinal epithelia was higher in GLP-2-treated mice than in irradiated mice, and the proliferation rate in small intestinal epithelia significantly increased in GLP-2-treated mice. These two indices were of significantly positive correlated. Conclusion　GLP-2 can promote small intestinal epithelial proliferation in irradiated mice, and this may be related to activation of MAPK in small intestinal epithelia.

Objective To evaluate the efficacy of radiosynovectomy with 32P colloid in haemophilic synovitis of adolescents. MethodsRadiosynovectomy with 32P colloid was primary performed on 26 male haemophilic patients(26 joints),whose average age was 16 years(11 to 21 years).The average dose of 32P colloid was 2.1 mCi(1.0 to 3.0 mCi). Results After 6-month interval,haemarthrosis was reduced by no less than 30% in 23 patients,with a total efficacy of 88.5%.The mean frequency of haemarthrosis was reduced from 1.9 per month of presynovectomy to 0.3 per month of postsynovectomy(P

Objective To explore the relationship between the endemic arsenism and the liver,renal damage.Methods Some permanent residents were selected as investigated subjects who lived at 3 villages in Datong in Shanxi Province,an arseniasis-endemic areas,These objects were divided into arsenic poisoning and control group on the basis of Diagnosis Standard for Endemic Arsenism(WS/T 211-2001).Then blood and urine samples were collected in the surveyed people.Serum glutamate pyruvic transaminase(ALT)were detected by Enzyme-linked immunosorbent assay as the indicator of the impaired hepatic function.The microdosis albumen (mAlb)and acetylglucosaminidase(NAG)in urine were detected by end-point method and alkaline picric acid as the renal damage indicators.Results A total of 661 people investigated,of which 144 cases were arsenic poisoning patients.The rates of abnormal liver function were significant hisher in arsenic poisoning group[10.42% (15/144)]than that in control[5.22%(27/517)],and both wag significant[X2=5.107,P＜0.05;OR=2.11,95%CI (1.09-4.08)].The geometric mean of mAlb/Ucr was 2.16 mg/g Cr in control,and 2.31 mg/g Cr in arsenic poisoning group,and both was not significant(t=-1.71,P＞0.05).The geometric mean of NAG waft higher in arsenic poisoning group(2.43 U/g Cr)than that in the control(2.22 U/g Cr),and both was significant(t=-3.55, P＜0.05).Conclusions The damage of the liver and renal function were related with endemic arsenism,and NAG is the early indicators suggesting impaired renal function due to endemic arsenism.

Targeting induced local lesions in genomes (TILLING) is a reverse genetics method for functional genomics research.It is possible to screen for point mutations in the populations of EMS mutagenesis with highthroughput and lowcost. EcoTILLING a method based on TILLING ,was developed for detecting multiple types of polymorphisms in germplasm collections,such as single nucleotide polymorphism,small deletion and insertion etc.Rice is a very important food crop and a model plant for genome research also. There are complete genome sequence and a lot of other bioinformatics resources about it.So the markerassisted breeding is becoming more and more important in rice breeding. Some issues based on TILLING about identifying germplasm based on gene sequence,EMS mutagenesis breeding,developing functional marker in rice breeding in future were discussed.

Background Human paired box gene 6 (PAX6)encodes a transcriptional regulator.It is essential for eye and brain morphogenesis.Mutation of PAX6 gene isresponsible for many congenital ocular malformations,such as aniridia.Aniridia is a autosomal dominant inheritance mode.Objective In this study,PAX6 gene mutation was analyzed in three Chinese families with aniridia through polymerase chain reaction (PCR) and sequencing.Methods The blood specimens were collected from 5 suffers and normal individuals of 3 aniridia families to extract DNA.The sequences of extron 4-13 were designed based on PAX6 gene.The primer was amplified by PCR and sequenced and compared with the known PAX6 gene sequence.This study complied with Declaration of Helsinki and approved by ethic committee of Sichuan University.Written informed consent was obtained from each individual before any medial examination.ResultsThere were 5 suffers in the 3 families.A heterozygous mutation (c.718 C＞T) in PAX6 gene was identified in 2 patients of family A.This mutation caused an amino acid substitution of arginine to termination codon at position 240 ( p.Arg240X) of PAX6 protein.No similar change in the normal families.No any the alteration of PAX6 gene was detected in family B whatever suffers and normal individuals.In family C,a deletion mutation of c.331 delG ( p.Val111 SerfsX13 ) in PAX6 gene was found.The deletion of one base caused frame shift mutation of PAX6 protein,and no such mutation was seen in other families.Conclusions Mutation of PAX6 gene appeares to be causative mutations of the disease in family A and C.

AIM:To investigate the value of 3D-optical coherence tomography (OCT) in the diagnosis of macular disease before phacoemulsification.METHODS:Clinical records of 423 cataract patients (512 eyes) who underwent phacoemulsification combined with intraocular lens implantation in our hospital from June to December in 2015 were retrospectively analyzed.In addition to preoperative routine examination of fundus, Topcon 3D-OCT 2000 was used to examine the macula, the detection rate of macular disease was compared, risk factors of cataract combined with macular disease were analyzed.RESULTS:The OCT image results of 305 cases (384 eyes, 72.1%) were successfully obtained, 133 cases showed macular disease (146 eyes), the detection rate was 28.5% (95%CI:27.64%-29.40%);the macular disease of 35 cases (37 eyes) were detected by routine examination of fundus before operation, the detection rate was 7.2% (95%CI:6.72%-7.74%);the detection rate of 3D-OCT was significantly higher than routine examination of fundus for macular disease (χ2=79.05, P<0.01).Female, over 65 years old, surgical history of diseased eye, and high myopia were risk factors of cataract combined with macular disease, the relative risk was 1.705 (95%CI:1.091,2.664), 1.893 (95%CI:1.219,2.939), 6.593 (95%CI:2.027,21.447) and 95%CI:5.130 (2.841,9.263) respectively, the risk of cataract combined with macular disease showed an increasing trend with rising age.CONCLUSION:In preoperative examination of cataract patients, 3D-OCT has higher sensitivity in the detection of macular disease, especially for women, over 65 years old, high myopia and surgical history of diseased eye, 3D-OCT can be used as a routine preoperative examination.

Objective To explore the risk factors of elderly people with pulmonary TB,and to provide the scientific evidence of prevention and interventions for tuberculosis among the old people in Nanchang City.Methods 1∶1 case control study was performed .A total of 390 pulmonary TB patients over 60 years old were selected as case group.One healthy person with the same gender and within 2 year age difference was selected to match each case.Interviews were carried out with a uniformly designed questionnaire.Logistic regression models were used for analysis.Results A total of 120 smear positive tuberculosis patients and 270 smear negative tuberculosis patients were investigated.And 72.82% male and 27.18% female of the 390 TB patients were investigated.Average age of patients was 70.34 ±7.75.Multivariate condition logistic regression analysis showed smoking(OR =2.359,95%CI:1.368 -4.068),contacting tuberculosis(OR =3.357,95%CI:1.854 -6.075),BMI 18.5 -24.9(OR =0.175,95%CI:0.056 -0.546),education (OR =0.110,95%CI:0.036 -0.332),annual average income (OR =0.475,95%CI:0.332 -0.681),per capita living space(OR =0.946,95%CI:0.920 -0.973)and drinking tea (OR =0.398,95%CI:0.268 -0.592)were the influencing factors(P <0.05).Conclusion Health education should be promoted auording to the risk factors,and patients manage ment should be streng thened.

Objective　To observe some biological features of bone marrow mesenchymal stem cells and explore the best conditions for isolatin g and culturing in vitro. Methods　Common cell culture techn ique, light and electron microscopy were used to study the effects of the growth , proliferation, morphology of the bone marrow mesenchymal stem cells in differe nt adherent time, concentration of serum and cell density. Results　The best culture condition in vitro for growth was 4-24 hours adherent time, 5%-10% fetal bovine serum, (4-8)×104/ml cell density. The cells were sp indle in shape and had a strong ability of proliferation. The time for cell duplication was 3 to 4 days. The cells showed the characteristics of stem cell s in electron microscope. Conclusion　The best condition for iso lation and culture of bone marrow mesemchymal stem cells was successfully establ ished and some biological features were obserred. It found a base for further in vestigation and using of mesenchymal stem cells.