Objective To establish and evaluate a diagnostic technique based on the AllGlo~(TM) probe for the invasive aspergillosis. Methods With the self-designed AllGlo~(TM) probes and primers and the standards, two standard curves of the real-time PCR based on AllGlo~(TM) probes were established respectively for A. flaws and A. fumigatus,then its specificity, sensitivity and reproducibility were evaluated respectively. Results The findings indicated that the standard curve of A. flavus was Y = - 3. 003X + 36. 825, and A. fumigatus' was Y = - 3. 052X + 38.016, and their interassay coefficient of variation respectively were 15.60% and 12. 94% , suggesting a good reproducibility. The lowest spore concentration they could be detected was 10 CFU/ml, which equated to 100-1000 copies of internal transcribed spacer (ITS)2 genes, suggesting a good sensibility. They didn't have cross-positive reaction with other fungus, human genome and bacteria, which indicated a good specificity. Conclusion The diagnostic technique based on the AllGlo?probe for the invasive aspergillosis possessed a good sensitivity, good specificity and deadly accuracy.

Objective To observe the effects of triptolide(TPL) on the anti-oncogene-APC gene of acute lymphoblastic leukemia cell line Jurkat in vitro. Methods The effects of TPL on proliferation Jurkat cells were assayed by using cell culture, MTT. The effects of TPL on APC gene of Jurkat cells were analyzed by nested methylation specific PCR and RT-PCR. The effects of TPL on the proteinum expression of APC gene were detected by Western blotting analysis. Results Following the treatment of TPL, the cell proliferation rate was degraded as the treatment concentration increased and the culture time extended. The effects were dose and time-dependent. The 48 hour IC50 was 19.7 ng/ml. TPL can reverse hypermethylation of APC gene,and induce the expression of the mRNA and the proteinum. Conclusion Low dose TPL could depress the proliferation rate of Jurkat. The possible mechanism might be its reversing the hypermethylation of APC gene and activiting the expression of APC gene.

Objective To investigate the relationship between promoter hypermethylation of secreted frizzled-related protein (SFRP) gene and acute leukemia (AL). Methods We examined the promoter methylation starus of SFRP1, 2, 4 and 5 in primary or relapsed AL patients, cell lines ( HL60,NB4, Molt-4 and Jurkat) and peripheral blood mononuclear cells from healthy people with methylationspecific PCR (MSP). Results None of the normal mononuclear cells showed methylation of any SFRP genes. The frequencies of aberrant methylation among the samples were 33.9% (20/59) for SFRP1,23.7%(14/59) for SFRP2, 6. 8% (4/59) for SFRP4 and 10. 2% (6/59) for SFRP5 in acute myelocytic leukemia (AML), and 39.3% (11/28) for SFRP1, 28.6% (8/28) for SFRP2, 25.0% (7/28) for SFRP4 and 32. 1% (9/28) for SFRP5 in acute lymphoblastic leukemia (ALL). Hypermethylation of SFRP1, 2, 5genes were present in the 4 AL cell lines. SFRP4 was methylated in NB4, Molt-4 and Jurkat cell lines.However, methylation and unmethylation of SFRP4 were both detected in HL60. Conclusions Hypermethylation of SFRP genes is a common event in the evolution of AL. Methylation of SFRP genes might serve as potential independent biomarkers for early detection of AL.

Objective To investigate the inhibition of proliferation and the regulation of histone acetylation modification in Jurkat cells treated by sodium valproate(VPA). Methods Jurkat cells were treated with VPA.Cell proliferation was determined by CCK-8 assay, and cell cycle were analyzed by flow cytometry (FCM). mRNA of HDAC1 was detected by semi-quantitative RT-PCR, and protein expression of HDAC1 and acetylation of histone H3, H4 was examined by Western blotting. Results VPA inhibited the proliferation of Jurkat cells in concentration-and time-dependent manners. After exposure to VPA in different concentrations for 48h,cell cycle was arrested obviously at G0/G1 phase (P <0.05), and with increasing concentration, the percentage of G0/G1 phase cells was increased and that of S phase were decreased. HDAC1 mRNA expression were inhibited with the increasing concentration of VPA. The protein level of HDAC1 was down-regulated, while acetylation of histone H3、H4 was up-regulated in Jurkat cells by VPA. Conclusion VPA can inhibit proliferation of Jurkat cells and induce G0/G1 phase arrest. The mechanism may be that VPA increase acetylation of histone H3/H4 by inhibiting expressions of HDAC1 gene.

Background: The risk of opportunistic infection in ulcerative colitis (UC) is significantly higher than that in healthy subjects, and has adverse impact on clinical outcome. Aims: To analyze the prevalence of opportunistic intestinal infection in UC patients and explore the risk factors of UC complicated with opportunistic infection. Methods: Clinical data of patients with UC hospitalized in Peking University Third Hospital from January 2012 to December 2020 were collected retrospectively. Information on demography, clinical characteristics, laboratory, endoscopic and pathological findings, as well as the medication histories were recorded; the factors associated with opportunistic intestinal infection were analyzed using univariate and multivariate analyses. Results: A total of 275 UC patients were included, with an opportunistic intestinal infection rate of 26.2%; among which, rates of cytomegalovirus (CMV), Epstein ‑ Barr virus (EBV), fungi, Clostridium difficile, amoeba, and multiple infection were 13.5%, 14.5%, 5.1%, 1.5%, 1.1%, and 9.1%, respectively. Multivariate Logistic analysis demonstrated that severe disease activity (OR=6.517, 95% CI: 1.487‑28.552, P=0.013) and albumin <30 g/L (OR=3.895, 95% CI: 1.590 ‑ 9.544, P=0.003) were independent risk factors for CMV infection. The independent risk factors for EBV infection included severe disease activity (OR=11.260, 95% CI: 2.249‑56.382, P=0.003), albumin <30 g/L (OR=2.548, 95% CI: 1.096‑5.927, P=0.030) and C‑reactive protein (CRP) elevation (OR=1.046, 95% CI: 1.007‑1.086, P=0.019). While for intestinal fungal infection, the risk in patients with chronic relapsing type UC was lower (OR=0.278, 95% CI: 0.087‑0.886, P=0.030). Intestinal multiple infection was mainly composed of viral infection, and the independent risk factors were similar to those of CMV and EBV infection. Conclusions: Most of the opportunistic intestinal infection in UC patients is viral infection. Disease activity, inflammatory response and reduced albumin are risk factors for intestinal viral infection in UC patients, while the risk of fungal infection is only related to clinical subtyping.