Spermatogenesis is a complex process. Current knowledge about human spermatogenesis is mainly based on the mouse model while little is known about the initial stage of this fundamental process in humans. The establishment of the model of spermatogenesis in vitro may contribute to an overall understanding of male germ cell development, an insight into the mechanisms of infertility, and clinical management of male infertility. This review summarizes current knowledge about the generation of germ cell-like cells from induced pluripotent stem cells (iPSCs) in vitro and discusses the potential application of iPSCs in the treatment of male infertility.
Animals ; Cell Differentiation ; Germ Cells ; Humans ; Induced Pluripotent Stem Cells ; Infertility, Male ; therapy ; Male ; Mice ; Spermatogenesis

Objective To investigate the timing for delivery in twin pregnancies to improve the perinatal outcome. Methods A multicentered and retrospective study was conducted on 655 women with twin pregnancies in 6 hospitals of Shanghai from Jan 1993 to Oct 2003. The average birthweight(BW) for both twins in different gestation, the incidence of small for gestational age (SGA) and severe neonatal asphyxia were analyzed. Results For the smaller babies in all twins, the 50 percentile of the birth weight was far behind the singletons throughout the pregnancy. But for the larger babies, it was similar to the singletons if delivered before 33 weeks, lighter than the singletons if after 33 weeks and remarkable difference was shown beyond 39 weeks. The largest BW of the larger babies was 3073 g presented at 39 weeks, while 2670 g for the smaller babies at 40 weeks after which the average BW was decreased. It reached 2555 g and 2303 g at 41 weeks for the larger and smaller babies, respectively (P

Protein transduction is an emerging technique in biological fields in recent years. Through the medium of protein transduction domain(PTD) composed by a small number of alkaline peptides, the functional proteins linked covalently with DNA, peptides, proteins or other macromolecules can across the membranes of mammalian cells, even the blood-brain barrier and transfer unconventionally that isn't like classical pathway. The distinct property of PTD that can take along fused protein entering into cells unconventionally offers a new vehicle to gene therapy for some diseases and has dulcet applied perspective.

Objective To confirm the role of human parvovirus B 19 ( B19) infection in childhood immune thrombocytopenia ( ITP) patients.Methods A total of 416 cases of newly diagnosed childhood ITP patients from Jan .2011 to Dec.2013 had been summarized to be cases group , Then a total of 130 childhood patients with common respiratory tract infection were selected randomly as the control group . All patients had been divided in grouped by age as <1 years group(n=187), 1-3 years group(n=127), 3-7 years group(n=71), and 7-14 years group(n=31).The incidence rate of B19 infection in all age groups, the prognosis conditions in B19 infection positive and negative groups after the same therapy protocol were obserred .Results The B19 infection rate had no statistical significance in re-search groups and control groups .And no significant difference in the same age groups compared with control groups (all P>0.05) was found.All the ITP patients had not been given anti -B19 treatment.The PLT remission rate,respectively, after treated with the same pro-tocol including glucocorticoid and/or immunoglobulin had a declining trend as the ages increasing .The B19 infection groups of all ages al-so had no significant difference PLT remission rate had been confirmed in non -B19 infection patients in each age groups (all P>0.05). Conclusions B19 infection may not be a major cause in childhood newly ITP , and treatment protocol with no anti -B19 treatment had no influence on the clinical curative efficacy .

Objective　To study the clinical diagnosis and treatment of juxtapapillary duodenal diverticula with biliary deseases. Methods　Eighteen duodenal diverticulum treated in our department in recent 5 years were retrospectivly analyzed, especially investigated the postcholecystectomy cases whose symptoms were continuing existence after operatoins. Articles about the surgical treatment were reviewed. Results　The total of 18 duodenal diverticulum with 17 cases of juxtapapillary duodenal diverticulum were included in this study. The ages of 12 cases were over 50 years old. Sixteen cases(88.89%) presented biliary stones. Seven cases once had performed cholecystectomy or cholecystectomy plus choledochotomy,but symptoms persisted after operations. The duodenal diverticulum were found by endoscopic retrograde cholangiopancreatography (ERCP) and hypotonic duodenography. Sixteen patients underwent surgical treatment with good effect. Conclusion　The juxtapapillary duodenal diveticula has the close relationship with biliary stones. ERCP and hypotonic duodenogrphy are the most reliable methods to get the correct diagnosis. In case of recurrent common bile duct stones after operations or persisting billiary symptoms after cholecystectomy, the coexistence of juxtapapillary duodenal diverticulum should be ruled out. The surgical treatment is only considered for the duodenal diverticulum with complication.

Heart Aneurysm ; mortality ; pathology ; surgery ; Humans ; Mitral Valve Insufficiency ; mortality ; physiopathology ; surgery ; Myocardial Infarction ; mortality ; physiopathology ; surgery ; Ventricular Dysfunction, Left ; pathology ; surgery

Objective To research the antibacterial effect in vitro of different extract of Wikstroemia indica.Methods Double dilution method was used to determine the MIC of 11 species bacterium.Results The acetic ether extract had much obvious effect than n-butanol extract,both of them had high effect on staph.,but the aqueous extract had little antibacterial effect.Conclusion The acetic ether extract has obvious antibacterial effect,also has broad-spectrum antibacterial activity.

OBJECTIVETo evaluate the effects of Attractin (Atrn) silence on the anti-oxidative and anti-apoptotic abilities of TM4 Sertoli cells and its influence on the expressions of superoxide dismutase (SOD) and caspase6 in the cells.

METHODSWe observed the apoptotic indexes of TM4 Sertoli cells with normal expression (control), partial deletion, and complete deletion of the Atrn gene (psiRNA-TM4, psiAtrn-TM4, and mu-SC). We determined the mRNA and protein expressions of SOD and caspase6 by Q-PCR and Western blot, measured the SOD activity and malondialdehyde (MDA) contentby spectrophotometry, and detected the apoptotic index of the cells by TUNEL.

RESULTSCompared with psiRNA-TM4, after inhibition of the Atrn expression, the Sertoli cells in the psiAtrn-TM4 and mu-SCgroups showed significantly decreased expressions ofSOD mRNA (70.76% and 92.58%) and protein (65.11% and 71.0%) (both P < 0.05). The levels of caspase 6 mRNA and protein were increased 5.28 and 3.40 times in the psiAtrn-TM4 and 2.97 and 2.50 times in the mu-SCgroup as compared with the normal control (both P < 0.05). Atrn deletion markedly increased the apoptotic indexes of the cells in the psiAtrn-TM4 and mu-SC groups by 16.22% and 22.03% (P < 0.05) and reduced the activity of SOD by 23.00% and 39.37% (P < 0.05); it also elevated the level of MDA by 155.22% (P < 0.05).

CONCLUSIONThe Atrn gene exerts influence on the function of Sertoli cells in multiple ways, in which antioxidative stress and apoptosis regulation may play an important role.

Animals ; Apoptosis ; Caspase 6 ; metabolism ; Cells, Cultured ; Gene Deletion ; Male ; Membrane Proteins ; genetics ; metabolism ; Mice ; Oxidative Stress ; Sertoli Cells ; metabolism ; pathology ; Superoxide Dismutase ; metabolism