Identification of in vitro angiotensin-converting enzyme and dipeptidyl peptidase IV inhibitory peptides from draft beer by virtual screening and molecular docking.

BACKGROUND: Hypertension and diabetes are two kinds of senile diseases which often occur simultaneously. The commonly used drugs in clinic may produce certain side effects. Food-derived polypeptide is a kind of polypeptide with great development potential, which has many functions of regulating human physiological function. Beer is rich in nutrition but there are few researches on bioactive peptides in beer. RESULTS: In this study, a rapid virtual screening method was established to obtain bioactive peptides from Tsingtao draft beer. The peptide sequence was analyzed by ultra-performance liquid chromatography-quadrupole-Orbitrap-tandem mass spectrometry (UPLC-Q-Orbitrap-MS2 ), and 50 peptides were identified. Eight peptides with potential biological activities were screened by using Peptide Ranker software and previous literature references. On the basis of absorption prediction, toxicity prediction, and molecular docking analysis, LNFDPNR and LPQQQAQFK were finally confirmed. The molecular docking results showed that two peptides could bind angiotensin-converting enzyme (ACE) and dipeptidyl peptidase IV (DPP-IV) tightly by hydrogen bonding and hydrophobic interaction. The in vitro activity evaluation results showed that two peptides had obvious ACE and DPP-IV inhibitory activity. CONCLUSION: This study established a method for rapidly screening bioactive peptides from Tsingtao draft beer, screened two ACE and DPP-IV inhibitory peptides in beer and analyzed their active action mechanism. This article may have great theoretical significance and practical value to further explore the health function of beer. © 2021 Society of Chemical Industry.

Pregnancy outcomes of in vitro fertilization and embryo transfer in infertile women with polycystic ovarian syndrome / 中华妇产科杂志

Objective To investigate the pregnancy outcomes of in vitro fertilization (IVF) and embryo transfer (ET) in infertile women with polycystic ovarian syndrome (PCOS).Methods From August 2005 to June 2011,200 IVF-ET cycles performed in women with polycystic ovarian syndrome in Shengjing Hospital and Shenyang 204 Hospital were enrolled in this retrospective study,matched with 400 IVF-ET cycles in infertile women with fallopian tube factors as control group.The incidence of abortion,gestational diabetes mellitus (GDM),hypertensive disorders in pregnancy,preterm birth,small for gestational age infant(SGA),large for gestational age infant (LGA),neonatal asphyxia,neonatal death and deformity was compared between two groups.Results The incidence of spontaneous abortion was 26.0％ (52/200) in PCOS group,which was significantly higher than 10.2％ (41/400) in control group (P ＜ 0.05).The incidence of GDM,hypertensive disorders in pregnancy,preterm birth,cesarean section in PCOS group was 23.6％ (35/148),16.2％ (24/148),17.6％ (26/148),83.1％ (123/148),which were significantly higher than 4.2％ (15/359),6.1％ (22/359),7.8％ (28/359),73.8％ (265/359) in control group (P ＜0.05).The incidence of SGA,LGA,neonatal asphyxia,neonatal death and deformity did not show remarkable difference between two groups,which were 2.7％ (4/148),4.7％ (7/148),5.4％ (8/148),0 in PCOS group and 1.4％ (5/359),2.2％ (8/359),2.8％ (10/359),0 in control group (P ＞0.05).Conclusion IVF-ET is an effective treatment for infertile women with PCOS,however,the incidence of spontaneous aborcion,GDM,hypertensive disorders in pregnancy,preterm birth,cesarean section in PCOS patients was increased.

Survivin ,P21~(WAF1/CIP1),Cyclin D1 proteins expression in cervical carcinoma:correlations with recurrence of early stage cervical cancer of the uterus / 中国癌症杂志

Purpose:To study the expression of Survivin,P21 WAF1/CIP1 and CyclinD1 proteins in cervical carcinoma and to investigate their relation to recurrence of early stage cervical cancer of the uterus.Methods:Using streptavidin-biotin peroxidase (sp) method,we examined the protein expression of Survivin, P21 WAF1/CIP1 and Cyclin D1 in 55 cervical carcinomas (45 cervical squamous carcinomas and 10 cervical adenocarcinomas ) and 10 normal cervical tissues.Results:① The positive rates of Survivin,Cyclin D1,P21 WAF1/CIP1 were 0,10.0%,20.0% in normal cervical tissue,and 68.9%,51.1%,57,8% in cervical squamous carcinomas,and 60.0%,90.0%,80.0% in cerrical adenocarcinomas respectively. There were significant differences in the positive results of Survivin,CyclinD1,P21 WAF1/CIP1 between normal cervical tissue and cervical cancer ( P 0.05).③The coexpression of Survivin with P21 WAF1/CIP1 or CyclinD1 were both associated with higher tumor grade( P