RESUMO
BACKGROUND: Bronchopulmonary dysplasia (BPD) in premature infants is a predominantly secondary occurrence to intrauterine inflammation/infection and postpartum mechanical ventilation; The purpose of this study is to explore the biological roles of lincRNA in the pathogenesis of BPD. METHODS: Newborn rats were randomly assigned to hyperoxia (85% O2) or the control group: the normoxia group (21% O2). Lung tissues were collected on days 1-14. The BPD animal model was validated using HE staining, Masson staining, and real-time RT-PCR. Deep Illumina sequencing was used to reveal the differential expression of long non-coding RNAs in hyperoxia bronchopulmonary dysplasia rat models. KEGG and GO functions were predicted. Nine possible BPD-related target lincRNAs were verified by RTq-PCR. RESULTS: The histopathologic changes in lung tissues manifested as hyperaemia, edema, hemorrhage, and inflammation cell infiltration after continuous exposure to hyperoxia for 3 days, and became aggravated after 7 days of hyperoxic exposure. The above lung tissue inflammatory manifestations were alleviated and taken over by pulmonary interstitia hyperplasia and fibrocyte proliferation after 14 days of hyperoxic exposure. The expressions of lincRNA differed between the hyperoxia bronchopulmonary dysplasia model group and the normoxia group. 1175 different lincRNAs were detected in the hyperoxia group and the normoxia group, of which 544 were up-regulated and 631 were down-regulated. 673 moleculars related to GO functions were enriched, including cell location and biological process. Pathway enrichment analysis showed that lincRNA was involved in 257 KEGG pathways. 9 lincRNA were validated in the sample, and the difference was statistically significant. CONCLUSION: LincRNAs were identified differently between the BPD model and the normoxia group. Many target genes were involved in the developmental process, including cell component biogenesis, biological regulation, transcription regulator, and translation regulator. The BPD might be caused by the activation of the pathways of the EMC-receptor interaction, cytokine-cytokine receptor interaction, cell cycle, and cell adhesion molecules. The present study provides new insight into the pathogenesis mechanism of BPD.
RESUMO
The aim of this study was to investigate the in vitro effect of interleukin-24 (IL-24) on apoptosis of bone marrow mononuclear cells (BMMNC) in children with acute leukemia. Every group of acute lymphocytic leukemia (ALL) and acute myeloid leukemia (ANLL) had 20 children who did not receive any therapy. The bone marrow was taken from patients and controls, the MNC were isolated from bone marrow, DNA was detected by glucose electrophoresis. Apoptosis of BMMNC was assayed by flow cytometry with propidium iodine staining. RT-PCR was used to detect the expression level of bcl-2, caspase-3 mRNA, and to analyze the effect of IL-24 on them. The results showed that the IL-24 induced apoptosis of BMMNC in children with acute leukemia. After acute leukemia BMMNC were exposed to IL-24 for 48 hours, DNA ladder fragment appeared, and the apoptotic rate of the group treated with IL-24 of 50 ng/ml was obviously higher than that of the control group (0 ng/ml). IL-24 decreased the bcl-2 mRNA expression level, enhanced caspase-3 mRNA expression level of BMMNC from AL patients. It is concluded that the IL-24 can induce apoptosis of AL BMMNC in vitro, which may be due to decreasing of bcl-2 mRNA level and enhancing of caspase-3 mRNA level.
