Objective To explore the effects of lithium on expressions of cyclin-dependent kinase 5 (CDK5) and protein phosphatase 2A (PP2A) in the brains of chronic aluminum exposure rats so as to further understand the mechanism of lithium's inhibition on tau phosphorylation. Methods We divided 12 chronic aluminum chloride exposure rats into treatment group and non-treatment group (6 rats in each). Treatment group was given lithium chloride (200 mg/kg?d) via gastric perfusion daily for 6 weeks,while the non-treatment group sodium chloride at the same dosage and the normal group (6 non-aluminum exposure rats of the same month old) without intervention. Six weeks later,all the rats received Morris water maze test for learning memory function; CDK5 and PP2A expressions and phosphorylated tau protein level in rat hippocampus were determined by Western blotting. Results Compared with normal group,non-treatment of chronic aluminum exposure group showed higher phosphorylated tau protein level and CDK5 expression in the brain (P0.05). Conclusion Lithium may reduce tau phosphorylation and neurofibrillary tangle formation by inhibiting the expression of CDK5.

Objective To investigate the apoptosis-inducing effect of L-gossypol on human nasopharyngesl carcinoma cell line CNE2 and its possible mechanism.Methods The effect of L-gossypol on proliferation of CNE2 cells was estimated by MTT assay.Flow cytometry was used to analyz cell apoptosis induced by(-)-gossypol and the expression of Bcl-2 、Bax proteins.Caspase-3 activity was determined by caspase-3 colorimetric assay kit.Results Lgossypol was able to inhibit the proliferation of CNE2 cells in a dose-dependent and time-dependent fashion at concentrations more than 10 μmoL/L.L-gossypol regulated cell cycle and GO/G1 arrest could be observed in CNE2 cells.In the process of apoptosis,the expression of Bcl-2 was down-regulated and Bax was up-regulated,caspase-3 activity was in peak at 24h.Conclusion L-gossypol could induce apoptosis in nasopharyngeal carcinoma cell line CNE2 in vitro,which may be associated with down-regulation of Bcl-2,up-regulation of Bax genes expression and caspase-3 activation.

Objective To analyze the biological activity of bioactive peptides in human breast milk and to find the polypeptides so as to investigate the preventive and therapeutic effects of breast milk-derived bioactive peptides on neonatal necrotizing enterocolitis(NEC).Methods Six mothers who gave birth to preterm neonates were enrolled in this study and 5 mL of their breast milk secreted within 2-5 postnatal days were collected for 6 times and blended subsequently.Bioactive peptides from maternal milk of the preterm infants were separated by ultrafiltration and analyzed by using tandem mass spectrometry.Polypeptides possibly with biological function were screened out by using bioinformatics software and the protein function cluster online analysis software was used to predict the polypeptides associated with infection according to the biological function of their precursor proteins.The ATCC25922,an Escherichia coli strain commonly associated with infection in NEC and drug solution (sulbactarr/cefoperazone) were used to conduct the drug susceptibility testing and bactericidal kinetics testing,so as to verify the antibacterial effects of bioactive peptides in the breast milk.Results Four thousand three hundred and eleven peptides contained in breast milk were identified successfully,of which 1 370 were non-differential peptides,and 188 peptides possibly with biological activity and 11 peptides were associated with infection.The peptide compound in the breast milk had antimicrobial activity and bactericidal power against Escherichia coli.Conclusions The active peptide compounds in the breast milk have antimicrobial activity,which play an important role in the prevention of NEC.Finding the true antimicrobial peptides with in vivo and in vitro biological activity by using antimicrobial spectrum test is expected.

This paper reported the management of a pregnant women with inherited protein C deficiency. The patient had a history of recurrent deep vein thrombosis before pregnancy and was diagnosed with inherited protein C deficiency by a pedigree-based whole exome sequencing, which revealed PROC gene mutations. She received anticoagulation treatment and was managed by a multidisciplinary team during pregnancy. No significant abnormalities were found during routine prenatal examination and a male infant was delivered vaginally at 38 +2 gestational weeks. No postpartum hemorrhage was reported and the maternal and infant outcomes were good. The management of such patients during pregnancy mainly relied on anticoagulation therapy to avoid serious thrombotic events and ensure the safety of the mothers and fetuses.

Hepatitis B virus (HBV) infection is still a serious disease threatening human health. Anti-HBV treatment is an extremely important means to reduce the threat of hepatitis B. In recent years, there has been no consensus on the timing and drug selection of anti-HBV therapy. The timing and drug selection of anti-HBV therapy in various populations are discussed in this article.