Influence of umbilical cord milking versus delayed cord clamping on the early prognosis of preterm infants with a gestational age of <34 weeks: a Meta analysis / 中国当代儿科杂志

OBJECTIVES@#To study the influence of umbilical cord milking versus delayed cord clamping on the early prognosis of preterm infants with a gestational age of <34 weeks.@*METHODS@#PubMed, Web of Science, Embase, the Cochrane Library, CINAHL, China National Knowledge Infrastructure, Wanfang Data, Weipu Database, and SinoMed were searched for randomized controlled trials on umbilical cord milking versus delayed cord clamping in preterm infants with a gestational age of <34 weeks published up to November 2021. According to the inclusion and exclusion criteria, two researchers independently performed literature screening, quality evaluation, and data extraction. Review Manger 5.4 was used for Meta analysis.@*RESULTS@#A total of 11 articles were included in the analysis, with 1 621 preterm infants in total, among whom there were 809 infants in the umbilical cord milking group and 812 in the delayed cord clamping group. The Meta analysis showed that compared with delayed cord clamping, umbilical cord milking increased the mean blood pressure after birth (weighted mean difference=3.61, 95%CI: 0.73-6.50, P=0.01), but it also increased the incidence rate of severe intraventricular hemorrhage (RR=1.83, 95%CI: 1.08-3.09, P=0.02). There were no significant differences between the two groups in hemoglobin, hematocrit, blood transfusion rate, proportion of infants undergoing phototherapy, bilirubin peak, and incidence rates of complications such as periventricular leukomalacia and necrotizing enterocolitis (P>0.05).@*CONCLUSIONS@#Compared with delayed cord clamping, umbilical cord milking may increase the risk of severe intraventricular hemorrhage in preterm infants with a gestational age of <34 weeks; however, more high-quality large-sample randomized controlled trials are needed for further confirmation.

COX-2 pathway changes in hippocampus and cortex of rat offsprings following maternal inflammation during pregnancy / 中国药理学通报

Aim: To observe the COX-2 pathway changes in hippocampus and cortex of rat offsprings following maternal inflammation during pregnancy. Methods: Female SD rats were randomly divided into control group and lipopolysaccharide (LPS) group. Rats in LPS group were intraperitonealy injected with LPS 300 μug · kg-1 on 11th, 14th and 18th day of pregnancy, while those in control group were given normal saline. Body weight of offspring rats on 3th, 10th, 20th and 30th day was recorded; on 30th day, the development of nervous system of the offspring rats was tested using water maze test, open field test and spontaneous activity test and so on; the histopathological changes of the hippocampus and cortex were detected by hematoxylineosin staining; the levels of inflammatory factors were measured by ELISA; the protein expression of COX-2 was measured by Western blot. Results: There were no significant differences in the body weight of offspring rats between NS group and LPS group (P >0. 05). In LPS group, it was found that the learning and memory function of rats were impaired, and horizontal movement and spontaneous activities were significantly reduced (P < 0. 05); the hippocampus and cortex neurons showed a significant nuclear pyknosis (P < 0. 05, P<0.01); the levels of PGD2, PGE2, PGI2, TNF- a, IL6 and IL-1 [J in hippocampus and cortex significantly increased (P < 0. 05, P < 0. 01); the protein expression of COX-2 in hippocampus and cortex significantly increased (P<0.01). Conclusions: COX-2 and downstream pathway are involved in the mechanism of brain injury in offsprings of pregnancy inflammation rats.

Biological Effects of the SARI Over-expression on K562 Cell Line / 中国实验血液学杂志

<p><b>OBJECTIVE</b>To construct a lentivirus vector carrying SARI gene and to investigate its biological effects on K562 cells.</p><p><b>METHODS</b>SARI was amplified from the plasmid containing SARI cDNA and subcloned into pLOV.CMV.eGFP virus vector. After sequencing, lentivirus packaging, titering, the viruses of SARI-pLOV.CMV.eGFP were harvested and tansfected into the K562 cells. Real-time quantitive PCR and Western blot were performed to validate the SARI expression at the level of mRNA and protein respectively. Simultaneously, the proliferation, apoptosis and cell cycle of K562 cells were detected by CCK-8 and flow cytometry respectively.</p><p><b>RESULTS</b>The SARI overexpressed lentivirus vector was successfully constructed. The mRNA and protein levels of SARI increased significantly in the pLOV.CMV.eGFP-SARI group, which was confirmed by Q-PCR and Western blot; as compared with blank and mock groups, SARI over-expression leaded to significant proliferation inhibition and increased apoptosis of K562 cells, without visible effects on cell cycle.</p><p><b>CONCLUSION</b>the over-expression of SARI gene obviously suppresses the cell proliferation of the K562 cells as well as promotes the apoptosis. The results implied that the induction of the SARI gene expression may be an important candidate therapeutic method for the CML.</p>

Methylation status of JunB and CDH13 gene promoter in CD34(+)CD38(-) chronic myelogenous leukemia cells / 中国实验血液学杂志

Chronic myelogenous leukemia (CML) is a clonal myeloproliferative disease of transformed hematopoietic progenitor cells. The expressions of JunB and CDH13 (cadherin-13) gene as tumor suppressor gene were inactivated by promoter methylation in CML patients. This study was purposed to investigate the methylation difference of JunB and CDH13 gene promoter and the expression levels of JunB and CDH13 gene in CD34(+)CD38(-) cells in CML patients vs normal individuals. CD34(+)CD38(-) cells from 8 cases of CML and 5 normal individuals were selected by flow cytometry. The methylation status of JunB and CDH13 genes were detected by MS-PCR in selected CD34(+)CD38(-) cells. The expression levels of JunB and CDH13 gene was detected with real time polymerase chain reaction (RT-PCR). The results showed that no methylation of JunB and CDH13 gene was detected in CD34(+)CD38(-) cells of 5 normal individuals. Methylations of JunB and CDH13 promoter were found in 87.5% (7/8) and 50% (4/8) CML CD34(+)CD38(-) cells, percentages of which were significantly higher than those in normal individuals. The difference was statistically significant (p < 0.05). The relative expression levels of JunB and CDH13 mRNA in CD34(+)CD38(-) cells of CML patients were significantly lower than those in normal individuals (2(-DeltaDeltaCT) were 1/5.21 and 1/10.63 respectively). It is concluded that the high methylation of JunB and CDH13 gene promoter occurs in CD34(+)CD38(-) cells of CML patients, their mRNA expression level is significantly lower, thus the methylation of JunB and CDH13 gene promoter probably plays a role in the pathogenesis of CML and may have clinical significance in predicting prognosis of CML.

Correlation between activation of L5-S2 spinal cord astrocytes and effect of substance P in chronic prostatitis pain / 中华男科学杂志

<p><b>OBJECTIVE</b>To observe the expressions of the substance P (SP) mRNA and neurokinin-1 receptor (NK-1R) in the posterior horn of the L5 - S2 spinal cord in the rat model of chronic prostatitis pain, and to investigate the changes in the activation of astrocytes and influence of SP on this activation in rat spinal cord astrocytes cultured in vitro.</p><p><b>METHODS</b>The rat model of chronic prostatitis pain was established by injection of complete Freund's adjuvant (CFA) and assessed by the tail flick threshold test, the control rats injected with sodium chloride and all observed at 0, 14 and 28 days. Changes in the expressions of SP mRNA, NK-1R, glial fibrillary acidic protein (GFAP), tumor necrosis factor-alpha (TNF-alpha) and inducible nitric oxide synthase (iNOS) in the posterior horn of the L5 - S2 spinal cord were detected by RT-PCR and Western blot. Rat spinal cord astrocytes were cultured in vitro and divided into a control group, cultured with ITS cell culture fluid, and two experiment groups, with Group 1 stimulated with SP at the concentration of 10(-9) - 10(-6) mol/L for 12 hours followed by determination of the expressions of TNF-alpha, IL-1beta, NO and NOS by ELISA and nitrate reductase and colorimetric methods, and Group 2 at 10(-7) mol/L for 0, 24, 48 and 72 hours followed by detection of the GFAP expression by Western blot.</p><p><b>RESULTS</b>The expressions of SP mRNA, NK-1 R, GFAP, TNF-alpha and iNOS in the posterior horn of the L5 - S2 spinal cord were obviously higher in the rat prostatitis pain models than in the controls, successively higher at 28 than at 14 and 0 d (P < 0.01), and so was the expression of GFAP at 28 than at 14 d in the experiment groups (P < 0.05). SP induced a gradual increase at 10(-7) mol/L in the expression of GFAP in the spinal cord astrocytes at 0 -72 h, significantly different from that of the control group (P < 0.01), and it promoted the excretion of TNF-alpha and IL-1beta and the activity of NO and NOS at 10(-9) - 10(-6) mol/L at 12 h in a concentration-dependent manner, with marked differences between the experiment and control groups (P < 0.01, P < 0.05). But a decreased excretion of IL-1 beta was observed in the 10(-6) mol/L group, though with no significant difference from the control (P > 0.05).</p><p><b>CONCLUSION</b>Chronic prostatitis pain could upregulate the expressions of the excitatory transmitter SP and receptor in the L5 - S2 spinal cord, and result in the activation of astrocytes and increased excretion of proinflammatory cytokines, which may be associated with the persistence and generalization of prostatitis pain.</p>

Differential expression profiles of MicroRNA during the development of human cord blood CD34(+)CD38(-) cells to CD34(+)CD38(+) cells / 中国实验血液学杂志

To establish a basis for deep investigation of the role of microRNA (miRNA) in the regulation of hematopoiesis, differential expression profiles of miRNA between human cord blood CD34(+)CD38(-) and CD34(+)CD38(+) cells were analyzed. Mononuclear cells from cord blood (CB) of healthy donors were separated by Ficoll-Hypaque density gradients. CD34(+)CD38(-) and CD34(+)CD38(+) cells were sorted by using FACS Vantage SE. Their mRNA were then extracted and hybridized to miRNA microarray chip. The resulting data were analyzed with GeneSpring and informatics technique. The results showed that eleven miRNAs were found to be downregulated and 73 miRNAs to be upregulated by at least two-fold in the CD34(+)CD38(+) cells of CB, compared with the CD34(+)CD38(-) cells, which maintained CD34(+)CD38(-) cells' self-renewal and multiple lineage potential, that were defined as "stemness" miRNAs. 12 of the 84 genes (14.29%) were common to 33 hematopoietic-expressed miRNAs expressed by CD34(+) cells from both peripheral blood and bone marrow in Georgantas's study, which included 10 upregulated miRNAs (hsa-miR-23b, -26b, -92, -107, -130a, -181a, -197, -213, -222, -223) and 2 downregulated ones (hsa-miR-16a, -155). Some "stemness" miRNAs undergo CD34 antigen-like expression pattern during development and commmitted differeniation of hematopoietic stem cell/progenitors. Hematopoiesis-associated miRNA clusters and putative target genes could be found with informatics technique. It is concluded that the hematopoietic "stemness" miRNAs play important roles in normal hematopoiesis: miRNA expression profiles of hematopoietic stem cell/progenitors --> their gene expression profiles --> their self-renewal and lineage-commmitted differeniation.

Operative techniques of anastomotic posterior urethroplasty for traumatic posterior urethral strictures / 中华创伤杂志(英文版)

<p><b>OBJECTIVE</b>To elucidate the details of operative technique of anastomotic posterior urethroplasty for traumatic posterior urethral strictures in attempt to offer a successful result.</p><p><b>METHODS</b>We reviewed the clinical data of 106 patients who had undergone anastomotic repair for posterior urethral strictures following traumatic pelvic fracture between 1979 and 2004. Patients'age ranged from 8 to 53 years (mean 27 years). Surgical repair was performed via perinea in 72 patients, modified transperineal repair in 5 and perineoabdominal repair in 29. Follow-up ranged from 1 to 23 years (mean 8 years).</p><p><b>RESULTS</b>Among the 77 patients treated by perineal approaches, 69 (95.8%) were successfully repaired and 27 out of the 29 patients (93.1%) who were repaired by perineoabdominal protocols were successful. The successful results have sustained as long as 23 years in some cases. Urinary incontinence did not happen in any patients while impotence occurred as a result of the anastomotic surgery.</p><p><b>CONCLUSIONS</b>Three important skills or principles will ensure a successful outcome, namely complete excision of scar tissues, a completely normal mucosa ready for anastomosis at both ends of the urethra, and a tension-free anastomosis. When the urethral stricture is below 2.5 cm long, restoration of urethral continuity can be accomplished by a perineal procedure. If the stricture is over 2.5 cm long, a modified perineal or transpubic perineoabdominal procedure should be used. In the presence of a competent bladder neck, anastomotic surgery does not result in urinary incontinence. Impotence is usually related to the original trauma and rarely (5.7%) to urethroplasty.</p>

Expression and role of toll-like receptors in U937 cells / 中国实验血液学杂志

The aim of study was to explore the potential application of targeting at Toll-like receptors (TLRs) in the immunotherapy of acute myelocytic leukemia, and to investigate the expression of TLR and the effects of TLR 8 agonist ssRNA40/LyoVec on proliferation, apoptosis and cell cycle of U937 cells. The expression of TLR 1 - 9 in U937 cells was detected by using reverse transcription polymerase chain reaction (RT-PCR) and the expression of TLR 8 was assayed by flow cytometry (FCM). The effect of TLR 8 agonist, ssRNA40/LyoVec, at different concentrations on U937 cells proliferation was evaluated by CCK-8, apoptosis and cell cycle were detected by FCM. The results showed that U937 cells expressed TLR 1 - 9. TLR 8 agonist ssRNA40/LyoVec could inhibit the growth of U937 cells both in time-and dose-dependent manner and the inhibitory rate could reach 70%. It also increased the percentage of cells in G(0)/G(1) phase. There was no significant difference in percentage of apoptotic cells between control and treated groups. It is concluded that TLRs including TLR 1 - 9 express on U937 cells and TLR 8 agonist ssRNA40/LyoVec may be able to inhibit the growth of U937 cells, arrest the cells in G(0)/G(1) phase, but have no effect of promoting apoptosis.

Expression of StAR mRNA in the Early Piglet Testes / 中国生物工程杂志

The expressions of StAR (steroidogenic acute regulatory protein) mRNA in testes from 7,14,23 and 37 day-old piglets were studied by tissue in situ hybridization. The results indicated that in the testes of piglets, StARmRNA was expressed in Leydig cells of pig testes. The expression level of StARmRNA was lower in 7 days piglets but higher in 14,23,37 days. The results indicated that StAR gene played an important role in steroid biosynthesis.

Transurethral resection of the prostate for patients with the permanent cardiac pacemaker / 中华男科学杂志

<p><b>OBJECTIVE</b>To evaluate the transurethral resection of the prostate (TURP) for patients with the permanent cardiac pacemaker.</p><p><b>METHODS</b>A retrospective study was made on TURP for 8 patients aged from 62 to 71 and equipped with the cardiac pacemaker for 2 to 7 years, because of sick sinus syndrome (5 cases), complete atrioventricular block (2 cases), and three-cord block (1 case). The pacemakers varied accordingly, Type DDD in 4, Type AAI in 3 and Type VVI in 1 of the patients.</p><p><b>RESULTS</b>All the operations were successful, and all the patients experienced satisfactory recovery.</p><p><b>CONCLUSION</b>Patients with the permanent cardiac pacemaker can receive TURP.</p>