Expression of Peroxiredoxin-6 Gene in Patients with Acute Myeloid Leukemia and Its Clinical Significance / 中国实验血液学杂志

OBJECTIVE@#To study the expression of Peroxiredoxin-6 (Prdx6) gene in elderly patients with acute myeloid leukemia (AML) and its clinical significance.@*METHODS@#The expression level of Prdx6 in bone marrow cells of 33 cases of AML, 8 cases of CML and 11 cases of other blood diseases was detected by PCR. The correlation of the abnormal expression of Prdx6 with patient age and blood routine parameters was further analyzed.@*RESULTS@#the expression level of Prdx6 in elderly patients with AML (≥60 years) was significantly lower than that in younger patients (＜60 years) (P＜0.05); the expression level of Prdx6 in low WBC (≤1×10/L) group was lower than that in medium WBC (1-10×10/L) group or high WBC (＞10×10/L) group (P＜0.05); the proportion of WBC count (≤1×10/L) in elderly patients with AML reached 38.5%, which was significantly higher than that in younger patients (5%) (P＜0.05); the overall survival (OS) rate of elderly patients was lower than that of younger patients (P＜0.05).@*CONCLUSION@#The expression of Prdx6 in elderly patients with AML is low, moreover, it relates with low value of WBC in peripheral blood, suggesting that it may be one of poor prognostic factors for the elderly patients with AML.

Expression of Peroxiredoxins and Pulmonary Surfactant Protein A Induced by Silica in Rat Lung Tissue / 生物医学与环境科学（英文）

Silicosis is one of the most serious occupational diseases in China and dates back to centuries ago. In this study, we successfully established a rat model of silicosis by intratracheal silica injection for 28 days and determined hydroxyproline levels to evaluate collagen metabolism in lung homogenates. Oxidative stress status was evaluated by detecting catalase and glutathione peroxidase activities. Expression levels of peroxiredoxins (Prx I and Prx VI) were detected by Western blotting. Pulmonary surfactant protein A (SP-A) levels in rat serum and lung tissue were analyzed by ELISA, and SP-A and Prx expression levels in lung tissues were detected by immunohistochemistry. The results suggest that Prx proteins may be involved in pulmonary fibrosis induced by silica. Downregulation of SP-A expression caused due to silica is an important factor in the occurrence and development of silicosis.

Expressions of peroxiredoxin 1, peroxiredoxin 6 and GFAP in human brain astrocytoma and their clinical significance / 南方医科大学学报

<p><b>OBJECTIVE</b>To characterize the expressions of peroxiredoxin 1 (Prx1), peroxiredoxin 6 (Prx6) and glial fibrillary acidic protein (GFAP) in human brain astrocytoma and explore their clinical significance.</p><p><b>METHODS</b>The protein and mRNA expression levels of Prx1, Prx6 and GFAP in human brain astrocytoma and normal brain tissue specimens were determined by Western blotting, RT-PCR and immunohistochemistry.</p><p><b>RESULTS</b>The protein and mRNA expressions of Prx1 and Prx6 increased significantly in the order of normal brain tissue, grade II astrocytoma, grade III astrocytoma and grade IV astrocytoma (P<0.05). The protein and mRNA expressions of GFAP decreased significantly in grade III and IV astrocytoma compared with those in grade II astrocytoma and normal brain tissues (P<0.05).</p><p><b>CONCLUSION</b>Prx1 and Prx6 may play important roles in the invasion and malignant development of human brain astrocytoma, and may serve as biomarkers for evaluating the invasiveness, malignancy and prognosis of the tumor as well as potential molecular targets in astrocytoma therapy.</p>

Effects of yiqi chutan recipe on tumor growth, survival time and expressions of PRDX-1 and PRDX-6 in Lewis lung carcinoma model mice with pi-deficiency syndrome / 中国中西医结合杂志

<p><b>OBJECTIVE</b>To investigate the effects of Yiqi Chutan Recipe (YCR, a Chinese herbal prescription for invigorating qi and removing phlegm) on the growth and metastasis of tumor, survival time, and the expressions of peroxiredoxin (PRDX-1 and PRDX-6) in tumor tissue of C57BL/6J mice bearing Lewis lung carcinoma.</p><p><b>METHODS</b>Lewis lung carcinoma cells were transplanted to 90 C57BL/6J mice receiving preconditioning for inducing Pi-deficiency syndrome and divided into three groups treated respectively with saline, high dose YCR (3.0 g/kg) and low dose YCR (1.0 g/kg) once a day via gastric infusion. Besides, a group of 30 healthy mice simply received tumor cell transplantation was set up for controls. Ten mice selected from each group were sacrificed 21 days later, the size, weight and lung metastasis foci of tumor in mice were measured, and expressions of PRDX-1 and PRDX-6 in tumor tissue were detected using immunohistochemical method. The survival time of the remained 20 mice in each groups was observed.</p><p><b>RESULTS</b>Tumor size, weight and the numbers of lung metastatic foci were (1.14 +/- 0.30) cm3, (0.83 +/- 0.26) g, (6.20 +/- 2.53) foci in the high dose YCR treated group, which were significantly lower than those in the control group [(2.83 +/- 0.35) cm3, (2.08 +/- 0.28) g, and (8.60 +/- 1.84) foci] respectively, also lower than those in the saline treated group [(2.29 +/- 0.49) cm3, (1.67 +/- 0.33) g and (8.70 +/- 2.00) foci]. The median survival time in the three groups, in above order, were 29.00 +/- 0.89 days, 22.00 +/- 0.75 days and 21.00 +/- 0.53 days; the average survival time in them 29.60 +/- 0.53 days, 22.90 +/- 0.50 days and 20.95 +/- 0.44 days; the PRDX-1 expression were 0.15 +/- 0.03, 0.52 +/- 0.07 and 0.61 +/- 0.09; and the PRDX-6 expression were 0.12 +/- 0.02, 0.43 +/- 0.06 and 0.56 +/- 0.07, all showed significant difference in comparing the indices in the high dose treated group with those in the control group and in the saline treated group (P < 0.05 or P < 0.01). The tumor growth inhibition rate was 50.30% in the high dose YCR group with life prolongation rate of 41.29%, all better than those in the low dose YCR treated group (P < 0.05).</p><p><b>CONCLUSIONS</b>YCR can remarkably inhibit the growth and metastasis of Lewis lung carcinoma in mice with Pi-asthenia syndrome, prolong their survival period, and its mechanism is possibly related to the reduction of over expressed PRDX-1 and PRDX-6.</p>

Effect of pinggan qianyang on hypothalamic proteome in the hyperthyroid rats with hyperactivity of liver-yang / 中南大学学报(医学版)

OBJECTIVE@#To investigate the effect of pinggan-qianyang (PGQY), a Chinese medicine, on hypothalamic proteome in the hyperthyroid rats with hyperactivity of liver-yang, and to explore its mechanism.@*METHODS@#The rat model was established by intraperitoneal injection of levo-thyroxine (L-T4) and fuzi decotion. All the quantitative and qualitative changes of the protein expressions were compared among the normal group,the model group and the treatment group by proteomic techniques.@*RESULTS@#The protein spots in the 3 groups were mainly displayed at the isoelectric point (pI) 3 approximately 10, and the molecular weights were 13.8 approximately 98.8 kD.Compared with the normal group, 6 spots of protein expression increased and 10 decreased in the model group. All the changed protein in the model group returned to normal level after PGQY treatment. Mass-spectrometer and bio-informatics indicated that these proteins were Prohibitin, Peroxiredoxin-6, histidine triad nucleotide-binding protein 1, protein-tyrosine-phosphatase, predicted protein, profilin-2, peroxir doxin-II, heat shock protein-27, and annexin-A1.@*CONCLUSION@#There are differences in the expression of hypothalamus proteins in the hyperthyroid rats with hyperactivity of liver-yang after the treatment with PGQY, and the 9 identified protein spots may be associated with the mechanism of PGQY.

Antioxidative role of peroxiredoxin 6 in acute lung injury / 中华儿科杂志

<p><b>OBJECTIVE</b>To confirm the antioxidant protective effect of peroxiredoxin 6 (Prdx6) in acute lung injury in mice.</p><p><b>METHODS</b>Lung injury or lung alveolar type II epithelial cell (AEC II) injury models were induced in mice by 100% O2 exposure or H2O2 treatments. Mice and AEC II cell survival rate or BALF analysis were applied for evaluating the degree of acute lung injury. Western Blot assay was used to determine Prdx6 or Gpx1 protein expression in lung. Annexin V staining method was applied to detect cell apoptosis on cultured AEC II cell, and thiobarbituric acid reactive substance (TBARS) measurement and diphenyl-1-pyrenyl phospholine (DPPP) assays were separately used to measure the level of lipid peroxidation in mice lung and AEC II cell membrane.</p><p><b>RESULTS</b>Under 100% O2 exposure, Prdx6-/- mice presented 24 h shorter survival time compared to wild type (WT) mice, on the contrary, Prdx6 gene over-expressed (Tg Prdx6) mice showed enhanced mice survival; meanwhile, the degree of AEC II cell injury had H2O2-dose dependent pattern with interactive relationship of Prdx6 protection. Under 100% O2 exposure for 72 h, it caused 7-fold decreased Gpx1 expression in Prdx6-/- mouse lung with no remarkable decrease of Prdx6 expression in Gpx1-/- mice. The percentage of apoptotic cells was significantly increased in AEC II cells from Prdx6-/- mice, and the percentage of AEC II apoptotic cells from Tg Prdx6 kept consistently around 10% under H2O treatments; also, the lipid peroxidation level of AEC II cell membrane was the highest in the group of Prdx6-/- mice, which was about 2 or 4-fold increased compared to the groups of WT or Tg Prdx6, separately; meanwhile, the lipid peroxidation level in Prdx6-/- mice, was also the highest compared to the other groups.</p><p><b>CONCLUSIONS</b>Prdx6 plays a critical role in defending acute oxidative lung injury and its function of defending cell apoptosis and cell membrane lipid peroxidation suggests its unique cell-based protective effect.</p>

Proteomics of Protein Expression Profiling in Tissues with Different Radiosensitivity / 대한방사선종양학회지

PURPOSE: The purpose of this study was to identify Radiosensitivity of proteins in tissues with different radiosensitivity. MATERIALS AND METHODS: C3H/HeJ mice were exposed to 10 Gy. The mice were sacrifiud 8 hrs after radiation. Their spleen and liver tissues were collected and analyzed histologicaly for apoptosis. The expressions of radiosusceptibility protein were analyzed by 2-dimensional electrophoresis and matrix-assisted laser desorption ionization time-of-flight mass spectrometry. RESULTS: The peak of apoptosis levels were 35.3+/-1.7% in spleen and 0.6+/-0.2% in liver at 8 hrs after radiation. Liver, radioresistant tissues, showed that the levels of ROS metabolism related to proteins such as cytochromm c, glutathione S transferase, NADH dehydrogenase, riken cDNA and peroxiredoxin VI increased after radiation. The expression of cytochrome c increased significantly in spleen and liver tissues after radiation. In spleen, radiosensitivity tissue, the identified proteins showed a significantly quantitative alteration following radiation. It was categorized as signal transduction, apoptosis, cytokine, Ca signal related protein, stress-related protein, cytoskeletal regulation, ROS metabolism, and others. CONCLUSION: Differences of radiation-induced apoptosis by tissues specifted were coupled with the induction of related radiosensitivity and radioresistant proteins. The result suggests that apoptosis relate protein and redox proteins play important roles in this radiosusceptibility.