DNA barcoding identification of Dendrobium huoshanense and its adulterants / 中国中药杂志

This research preliminarily discusses the relations of Dendrobium system growth through chloroplast gene rbcL, matK and the nuclear genome ITS2. The DNA barcoding universal sequence for authentication of the Dendrobium medical plants was slected and the possibility concerning utilizing the DNA barcoding to distinguish the D. huoshanenseand its adulterants was analyzed. Using the universal primer pair of ITS2, rbcL and matK, series of extended sequencing in the Dendrobium were conducted. Meanwhile, considering the different index about amplification and sequencing success rate of each sequence, the intraspecific and interspecific aberrance, the employment of BioEdit and MEGA 5.0 software were applied to establish the systematic tree of the NJ molecular and evaluate the diversified authentication capability of various sequences. The consequence demonstrates that the sequence of ITS2 is not only the largest one both in the intraspecific and interspecific aberrance of the Dendrobium but also has obvious barcoding gap. Considering the few overlap between the intraspecific and interspecific aberrance and the highest percentage regarding the formation of unilateral branch in diverse Dendrobium which have different ITS2 sequences, it can differentiate the species of Dendrobium. Furthermore, due to the inferior success rate of the rbcL and thematK and the lower reliability of NJ systematic tree, the percentage of the unilateral species which are generated by the systematic tree of rbcL and matK sequences is deficient. Therefore, the sequence of ITS2 can serves as DNA barcoding to distinguish the D. huoshanense, the D. moniliform and the D. officinale.

Effect and Clinical Significance of Bortezomib and Thalidomide on the Memory T Cells Subsets and Regulatory T Cells in Peripheral Blood of Patients with Multiple Myeloma / 中国实验血液学杂志

<p><b>OBJECTIVE</b>To investigate the effects of bortezomib(BTZ) and thalidomide(TM) on peripheral blood memory T-cells (T) and regulatory T cells(Tregs) in patients with multiple myeloma(MM).</p><p><b>METHODS</b>Eighty-six MM patients received 2 courses of chemotherapy were divided into effective (partial response at least) group (63 cases) and ineffective (no partial response) group (17 cases) according to therapeutic efficacy; these 80 patients were divided into BTZ group (38 cases) and TM group (42 cases) yet according to therapeutic regimens, 20 newly diagnosed MM patients were used as baseline group, 30 healthy volunteers were used as healthy control group. The T subsets and Treg in peripheral blood of each groups were detected by flow cytometry.</p><p><b>RESULTS</b>The CD4 central memory T cells (CD4 T) percentage of CD4 T, the CD18 T percentage of CD18T and ratio of CD8 T and CD8 effector memory T cells (T) (CD8 T/T) in baseline group were all significantly lower than those in healthy control group (P<0.05). After treatment with BTZ regimen or TM regimen, the CD8T percentage of CD8 T in effective group significantly increased to level of healthy control group (P<0.05); the Treg cell level in effective and in effective groups was not significantly different from that in baseline group(P>0.05), but the Treg percentage of CD4 cells ineffective group was significantly higher than that in baseline group and ineffective group (P<0.05). According to ROC curve, the critical value of CD8T/T for predicting chemotherapeutic response was 0.27 with sensitivity of 57.1% and specificity of 94.1%.</p><p><b>CONCLUSION</b>When MM patients are in an immuno-exhanstive status, the treatment with BTZ or TM both can reverse the immuno-inhibitory status of MM patients, moreover, does not affect the Treg cell count; the Treg percentage in BTZ and TM effective groups both are significantly higher than that in baseline group and ineffective group. The ratio of CD8T/T contributes to evaluating the chemotherapeutic efficacy.</p>

Effect of Notch signaling pathway in hepatocellular carcinoma cell migration / 中国现代普通外科进展

Objective:To investigate the role of Notch signaling pathway in the migration of hepatocellular carcinoma cells and its related mechanisms.Methods:HepG2 was cultured in vitro,which was HL-7702,Huh-7.The migration ability of Transwell cells was detected,Notch,Snail,Westernblot to detect the expression of E-cadherin protein.1 mol/L DAPT and 5 mol/L DAPT were used to block the Notch signaling pathway,and compared the effects of different concentrations on cell migration and the expression of Snail and E-cadherin protein in hepatocellular carcinoma cells.Results:The invasion and migration ability of HCC cell lines was significantly higher than that of normal non neoplastic liver cells (P＜0.05).The invasion and migration ability of HepG2 was slightly higher than that of Huh-7,but the difference was not statistically significant (P＞0.05).Used Western blot method to detect protein imprinting cells Notch,SnaiI,E-cadherin protein expression,results showed that the expression of Notch and Snail in liver cancer cells than normal cells,the expression of E-cadherin was significantly lower than that of normal cells.Blocking the Notch signaling pathway by 1 mol/L DAPT and 5 mol/L DAPT results showed that compared with the control group,the expression of 1 mol/L DAPT and 5 mol/L DAPT can significantly reduce Snail,increased the expression of E-cadherin,and with the increase of the concentration of strengthening effect (P＜0.05).Conclusion:Notch signaling pathway plays an important role in the invasion and migration of hepatocellular carcinoma cells.It is believed that the expression of Snail and E-cadherin may be related to the expression.

Effect of Notch signaling pathway in hepatocellular carcinoma cell migration / 中国现代普通外科进展

Objective:To investigate the role of Notch signaling pathway in the migration of hepatocellular carcinoma cells and its related mechanisms.Methods:HepG2 was cultured in vitro,which was HL-7702,Huh-7.The migration ability of Transwell cells was detected,Notch,Snail,Westernblot to detect the expression of E-cadherin protein.1 mol/L DAPT and 5 mol/L DAPT were used to block the Notch signaling pathway,and compared the effects of different concentrations on cell migration and the expression of Snail and E-cadherin protein in hepatocellular carcinoma cells.Results:The invasion and migration ability of HCC cell lines was significantly higher than that of normal non neoplastic liver cells (P＜0.05).The invasion and migration ability of HepG2 was slightly higher than that of Huh-7,but the difference was not statistically significant (P＞0.05).Used Western blot method to detect protein imprinting cells Notch,SnaiI,E-cadherin protein expression,results showed that the expression of Notch and Snail in liver cancer cells than normal cells,the expression of E-cadherin was significantly lower than that of normal cells.Blocking the Notch signaling pathway by 1 mol/L DAPT and 5 mol/L DAPT results showed that compared with the control group,the expression of 1 mol/L DAPT and 5 mol/L DAPT can significantly reduce Snail,increased the expression of E-cadherin,and with the increase of the concentration of strengthening effect (P＜0.05).Conclusion:Notch signaling pathway plays an important role in the invasion and migration of hepatocellular carcinoma cells.It is believed that the expression of Snail and E-cadherin may be related to the expression.

Research Progress on Molecular Mechanisms of Resistance to Bortezomib in Multiple Myeloma- Review / 中国实验血液学杂志

Over the last decade, bortezomib(BTZ) has been extensively applied in the treatment of hematological malignancies, particularly in multiple myeloma and mantle cell lymphoma, however, the appearence of secondary resistance to BTZ has brought a huge challenge in MM treatment. In the present review, the mechanisms of resistance to bortezomib in MM are summarized, focusing on the action of ubiquitin-proteasome system(UPS), endoplasmin reticulum stress, antophagy, inducible pro-survival signalling and bone marrow microenvironment as well as exploration of the potential therapeutic strategies in the clinical perspective. With the understanding of the molecular mechanisms for resistance to BTZ, the novel histone deacetylase inhibitors(HDACi) have been approved for the treatment of replased/refractory MM and AKT inhibitor in the clinical trials. These novel combined therapies can enhance BTZ efficiency and improve the outcome of the patients.

Study about seroconversion of HBV NAT screening-positive crowd from blood donors / 中华实验和临床病毒学杂志

<p><b>OBJECTIVE</b>To investigate the characteristics of seroconversion of HBV NAT screening-positive crowd from blood donors in Dongguan city and provide reference for the safety of blood transfusion and disease prevention.</p><p><b>METHODS</b>With retrospective survey, Nucleic acid testing (NAT) was used to analyze 28800 HBsAg-negative samples by ELISA from blood donors in Dongguan city from August, 2006 to August, 2007 with Roche Cobas AmpliScreen systems; and follow-up research including NAT for HBV-DNA, ELISA for HBsAg and multiple factors analysis for HBV infection was carried out on HBV NAT screening-positive crowd.</p><p><b>RESULTS</b>10 positive pooling were screened from 28800 samples; after further detection, 2 of these positive pooling were HBV-DNA negative and 8 HBV-DNA positive samples were found.The 10-week follow-up research on these 8 blood donors showed that 6 were HBV-DNA positive and HBsAg-negative at 2 weeks, 4 weeks, 6 weeks, 8 weeks, 10 weeks respectively, 1 was not HBsAg positive until 2 weeks and was positive on follow-up, and considered in "window period", 1 was HBV-DNA negative, HBsAg-negative on follow-up. Of these 8,7 were not only migrant laborers with poor condition of work, life and health but also in high risk of secondary infection for HBV, in addition they had little idea of therapy or prevention measures of HBV infection and the other 1 was HBV-DNA negative, HBsAg-negative on follow-up, who was in better condition than the above 7 donors.</p><p><b>CONCLUSION</b>NAT is more sensitive than ELISA in screening HBV, but the probability of being false positive of NAT can not be ignored at the same time. On the hand, only screening HBsAg for HBV is relative limitation in high infection region of China. Some factors would have effect on the serum conversion of blood donors including the quality of work and life, therapy or prevention measures.</p>

Analysis of DC-SIGN and DC-SIGNR genetic polymorphism in Chinese Han population / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To understand the genetic polymorphism of DC-SIGN's and DC-SIGNR's neck regions in normal Chinese Han population, and to obtain the genetic data of the two loci in Chinese Han population.</p><p><b>METHODS</b>The genotypes and alleles of repeat sequences of DC-SIGN and DC-SIGNR neck region were typed by PCR, agarose gel electrophoresis and sequencing. Polymorphism information content (PIC) of DC-SIGNR was calculated.</p><p><b>RESULTS</b>DC-SIGN genetic polymorphism was rare. Allele 7 was most and its frequency was 0.9808. 4-, 5-, 6- and 8- alleles were also found, although their frequencies were very low. Caucasians had only 6- and 8- allele mutants; DC-SIGNR genetic polymorphism was high, its PIC was 0.5312, 4-,5-,6-,7-,8-,9- alleles and 16 genotypes were found in normal Chinese Han population. The differences of 6/5,7/4,7/5,7/6,7/7,9/5,9/7,9/9 genotypes distribution and 5-,6-,7-,9- alleles frequency between normal Chinese Han population and Caucasian population were all extremely distinct (P<0.01). The inserted mutation seemed more in Chinese Hans than Caucasian population.</p><p><b>CONCLUSION</b>DC-SIGN and DC-SIGNR genotypes and alleles distribution in Chinese Han population are significantly different from Caucasian population and with Chinese own population genetic characteristics, compared with Caucasians.</p>

Advances in the treatment of Chlamydia trachomatis infection / 中华男科学杂志

Chlamydia trachomatis may cause trachoma, pneumonia, urogenital infection, conjunctivitis and lymphogranuloma venereum, etc. This paper reviews the effects of monotherapy, combined antibiotic regimens, and drug resistance during the treatment of Chlamydia trachomatis infection.