Leukemia Genotype Analysis of Children with Acute Lymphoblastic Leukemia in Yunnan Area / 中国实验血液学杂志

OBJECTIVE@#To analyze 43 leukemia genes in children with acute lymphoblastic leukemia (ALL) in Yunnan province, and provide the basis for the diagnosis and treatment of children with ALL in this area.@*METHODS@#The clinical data of 428 children with newly diagnosed ALL in Yunnan area from January 2015 to December 2020 were retrospectively analyzed. Multiple nested PCR technology was used to detect 43 common leukemia genes.@*RESULTS@#Among the 428 children with ALL, 159 were positive for leukemia genes, with a positive rate of 37.15% (159/428), and a total of 15 leukemia genes were detected. Among the 159 leukemia gene-positive children, ETV6-RUNX1+ accounted for 25.79% (41/159), followed by E2A-PBX1+ and BCR-ABL+, accounting for 24.53% (39/159) and 23.27% (37/159) respectively. MLL+ accounted for 6.29% (10/159), WT1+ accounted for 4.40% (7/159), IKZF1 gene deletion and CRLF2+ accounted for 3.77% (6/159) respectively. The positive rate of MLL (46.15%) was the highest in ＜1-year old group, the positive rate of ETV6-RUNX1 (10.56%) was the highest in 1-10-year old group, and BCR-ABL+ rate (23.65%) was the highest in >10-year old group. The distribution of leukemia genes in different age groups was statistically significant (P <0.05).@*CONCLUSION@#The most common fusion gene of children with ALL in Yunnan is ETV6-RUNX1, followed by E2A-PBX1 and BCR-ABL.

Frequency distribution and antibiotic resistance of pathogens from the cerebrospinal fluid of 116 children with bacterial meningitis / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To determine the frequency distribution and antibiotic resistance of pathogens isolated from the cerebrospinal fluid samples of children with bacterial meningitis (BM) and to provide a basis for the timely and effective treatment of childhood BM.</p><p><b>METHODS</b>Retrospective analysis was performed on pathogens isolated from 5097 cerebrospinal fluid samples collected from children in Kunming Children's Hospital between January 2008 and June 2012, as well as drug sensitivity test results. Kirby-Bauer antibiotic testing was used to analyze the sensitivity of these pathogens to commonly used antibiotics.</p><p><b>RESULTS</b>A total of 116 pathogen strains were detected from the 5097 cerebrospinal fluid samples, including 77 (66.4%) Gram-positive strains, 30 (25.9%) Gram-negative strains, and 9 (7.8%) fungal strains, with a positive rate of 2.28%. The six most frequently isolated pathogens were Staphylococcus epidermidis (32 strains, 27.6%), Streptococcus pneumoniae (15 strains, 12.9%), Escherichia coli (15 strains, 12.9%), Staphylococcus haemolyticus (9 strains, 7.8%), Cryptococcus neoformans (8 strains, 6.9%) and Staphylococcus aureus (6 strains, 5.2%). Coagulase-negative staphylococci was the predominant pathogen in neonates and young infants with BM, and its sensitivity rates to penicillin, erythromycin and clindamycin were lower than 40%. Streptococcus pneumoniae had a penicillin sensitivity rate of 13.4%, while sensitivity rates to erythromycin and clindamycin reached 60.0%. No Staphylococcus and Streptococcus pneumoniae pathogens resistant to vancomycin were found. Gram-negative bacilli had relatively high sensitivity rates to imipenem, meropenem, cefoperazone/sulbactam and cefepime.</p><p><b>CONCLUSIONS</b>Gram-positive cocci are the predominant pathogens for childhood BM over the past five years. The detected pathogens develop high resistance to commonly used antibiotics. To prevent misdiagnosis, careful attention should be paid to BM caused by Cryptococcus neoformans.</p>

RNA interference-mediated inhibition of survivin expression in Hela cell line by siRNA expression vector targeting survivin gene / 南方医科大学学报

<p><b>OBJECTIVE</b>To prepare small interfering RNA (siRNA) targeting survivin for inhibition of endogenous survivin gene expression in Hela cell line and evaluate its effect on promoting Hela cell apoptosis.</p><p><b>METHODS</b>The recombinant plasmid pshRNA-survivin-1 and pshRNA-survivin-2 were constructed and transfected into Hela cells, in which the expression level of survivin was determined by immunofluorescence staining and survivin gene transcription detected by semi-quantitative RT-PCR.</p><p><b>RESULTS</b>Introduction of the plasmids pshRNA-survivin-1 and pshRNA-survivin-2 into Hela cells resulted in efficient and specific inhibition of survivin expression as demonstrated by immunofluorescence staining. Semi-quantitative RT-PCR showed that mRNA transcription of survivin gene was reduced. In contrast, the control plasmid did not exhibit any inhibitory effect on the protein expression and mRNA transcription of survivin gene. PI-Annexin V staining indicated an apoptosis rate of the transfected Hela cells of (36.02-/+2.12)% (P<0.01) and (35.29-/+2.02)% (P<0.01), respectively.</p><p><b>CONCLUSION</b>The prepared siRNA targeting survivin gene is capable of inducing marked inhibitions of survivin protein expression and RNA transcription and significant enhancement of apoptosis in Hela cells, which shed light on a new strategy in gene silence therapy targeting survivin.</p>