The effect of paraquat on voltage-dependent anion channel and caspase-3, 8, 9 in the mitochondria of rat lung / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>To investigate the effects of different concentrations of paraquat (PQ) poisoning on the expression of voltage-dependent anion channel (VDAC) and caspase family in the mitochondria of rat lung tissue, and to explore possible mechanisms of acute lung injury induced by acute PQ poisoning.</p><p><b>METHODS</b>Two hundred healthy adult Wister rats with equal numbers of male and female ones were randomly and equally divided into control group and poisoned group. The control group received one-time gastric lavage with 1 ml of normal saline, and the poisoned group with PQ (50 mg/kg) diluted in 1 ml of normal saline. Twenty rats were collected at 1, 24, 72, 120, and 168 h after lavage with normal saline or PQ and dissected after anesthesia. Mitochondria were separated from rat lung tissue, and the content of VDAC and caspase-3, -8, and -9 were determined.</p><p><b>RESULTS</b>The expression of VDAC and caspase-3, -8, and -9 in the poisoned rats were significantly higher than that in the control group (P < 0.001). At 1, 24, 72, 120, and 168 h after exposure, acute diffuse damages were found in alveolar capillary endothelial cells, alveolar epithelial cells, and pulmonary interstitial cells. Inflammatory cell infiltration in the pulmonary interstitium, alveolar structural disorder, and substantially increased fibroblasts were also found in rat lung tissue.</p><p><b>CONCLUSION</b>PQ poisoning can up-regulate the expression of VDAC and caspase-3, -8, and -9 in mitochondria of rat lung tissue to induce acute lung injury.</p>

Alternative polyadenylation site analysis of tumor-related genes based on 3'RACE in gastric cancer cells / 南方医科大学学报

<p><b>OBJECTIVE</b>To analyze the alteration in alternative polyadenylation (APA) sites of tumor-related genes in gastric cancer cells.</p><p><b>METHODS</b>We used 3'RACE to capture the APA sites of two tumor-related genes (HSP90α and SEC11A) in gastric cancer cell lines MKN45, MKN28 and AGS, and compared the results with annotated poly(A) sites in UCSC database.</p><p><b>RESULTS</b>We found new APA sites in the two tumor-related genes in gastric cancer cells to produce new mRNA isoforms with different 3'UTRs.</p><p><b>CONCLUSIONS</b>There are new mRNA isoforms of HSP90α and SEC11A derived from ATA in gastric cancer cells, which provides new insights into the mechanisms of gastric tumorigenesis.</p>