Carfilzomib inhibits the growth of lung adenocarcinoma via upregulation of Gadd45a expression / 浙江大学学报（英文版）（B辑：生物医学和生物技术）

Proteasome inhibitors have shown remarkable success in the treatment of hematologic neoplasm. There has been a lot of attention to applying these drugs for solid tumor treatment. Recent preclinical study has signified the effectiveness on cell proliferation inhibition in lung adenocarcinoma treated by carfilzomib (CFZ), a second generation proteasome inhibitor. However, no insight has been gained regarding the mechanism. In this study, we have systematically investigated the CFZ functions in cell proliferation and growth, cell cycle arrest, and apoptosis in lung adenocarcinoma cells. Flow cytometry experiments showed that CFZ significantly induced G2/M cell cycle arrest and apoptosis in lung adenocarcinoma. MTS and colony formation assays revealed that CFZ substantially inhibited survival of lung adenocarcinoma cells. All results were consistently correlated to the upregulation expression of Gadd45a, which is an important gene in modulating cell cycle arrest and apoptosis in response to physiologic and environmental stresses. Here, upregulation of Gadd45a expression was observed after CFZ treatment. Knocking down Gadd45a expression suppressed G2/M arrest and apoptosis in CFZ-treated cells, and reduced cytotoxicity of this drug. The protein expression analysis has further identified that the AKT/FOXO3a pathway is involved in Gadd45a upregulation after CFZ treatment. These findings unveil a novel mechanism of proteasome inhibitor in anti-solid tumor activity, and shed light on novel preferable therapeutic strategy for lung adenocarcinoma. We believe that Gadd45a expression can be a highly promising candidate predictor in evaluating the efficacy of proteasome inhibitors in solid tumor therapy.

Protective effect of curcumin derivative B06 on kidney of type 2 diabetic rats / 中国应用生理学杂志

<p><b>OBJECTIVE</b>To observe the effect and mechanism of curcumin derivative B06 on kidney from rats with hyperlipidemia and type 2 diabetes.</p><p><b>METHODS</b>Thirty five male SD rats were randomly divided into five groups(n = 7): the normal control group, high-fat group, high-fat + B06-treatd group, diabetic group, diabetic + B06-treated group. After fed with high-fat diet for 4 weeks, the later two groups were in- jected with streptozotocin intraperitoneally to induce type 2 diabetes mellitus. B06-treated groups were given B06 by gavage at a dosage of 0.2 mg/kg . d for 8 weeks. After the treatment, the serum creatinine, blood urea nitrogen and uric acid were detected biochemically, the morphology of kidney was observed with light and transmission electron microscopy, the expression of collagen fibers was observed with Masson staining, the protein expression of collogen IV and fibronectin in kidney were determined by Immunohistochemistry.</p><p><b>RESULTS</b>It was showed that the levels of the serum creatinine and blood urea nitrogen elevated significantly in diabetic group. In high-fat and diabetic groups, increased glomerular mesangial matrix and collagen fiber and thicken glomerular basal membrane were observed under light microscopy, swelling and fusion of foot process were found under electron microscope; increased green matrix within glomeruli was observed under Masson staining. collogen IV and fibronectin protein expression were significantly enhanced in high-fat group and diabetic group. After B06's intervention, the levels of serum creatinine and blood urea nitrogen were decreased in diabetic groups, the morphological change of kidney was obviously relieved, Collogen IV and fibronectin protein expression reduced.</p><p><b>CONCLUSION</b>Curcumin derivative B06 exerts a protective effect on kidney in type 2 diabetic rats, reduced expressions of collogen IV and fibronectin, inhibition of the accumulation of extracellular matrix and glomerular mesangial proliferation, and then prevention of renal fibrosis may be the mechanism.</p>

The study of the expression and the prognostic value of Survivin and Ki67 in pancreatic endocrine tumors / 中国应用生理学杂志

<p><b>OBJECTIVE</b>To explore the relationship between the expression of Survivin and Ki67 with prognosis of pancreatic endocrine tumors (PETs).</p><p><b>METHODS</b>Immunohistochemistry for Survivin and Ki67 was performed in 25 cases of normal pancreatic tissues and 81 cases of PETs by tissue microarrays and to observe the expression and evaluate the relationship with prognosis.</p><p><b>RESULTS</b>(1)The expression of Survivin and Ki67 in PETs was significantly higher than that in normal pancreatic tissues (P <0.01); (2)The expression of Survivin and Ki67 in PETs was correlated with tissue grading and the TNM-staging (P < 0.05), but not related with tumor size, location and functional status. In addition, the expression of nuclear Survivin was association with lymph node metastasis (P < 0.05). (3)The high expression of Ki67 was related with the expression of nuclear Survivin, but not related with the expression of cytoplasmic Survivin.</p><p><b>CONCLUSION</b>Survivin and Ki67 were both expressed in PETs, which were closely related to the clinical pathological characteristics. They could be used as new indicators in the evaluation of prognosis of PETs. The expression of Survivin in nucleus had more diagnostic significance than that in cytoplasm, and that could be highly correlated with lymph node metastasis, which would be used as a new marker of poor prognosis.</p>

The effect and mechanism of curcumin derivative B06 on the myocardium from type 2 diabetic rats / 中国应用生理学杂志

<p><b>OBJECTIVE</b>To investigate the protective effect and mechanism of curcumin derivatives B06 on myocardium from type 2 diabetic rats.</p><p><b>METHODS</b>Thirty-five male SD rats were randomly divided into 5 groups, normal control group (NC group), high fat group (HF group), high fat treatment group (FT group), diabetes mellitus group (DM group) and diabetes treatment group (DT group) (n = 7). The late four groups were fed with high fat food, after four weeks of high fat feeding, the rats from DM group and DT group were injected with low dosage of streptozocin intraperitoneally to induce diabetes mellitus, FT group and DT group were gavaged with curcumin derivatives B06 at the dosage of 0.2 mg/kg x d. The blood glucose and lipid were detected biochemically, blood insulin was assayed by ELISA and the insulin resistance index was calculated, the morphology of myocardium was observed by light and transmission electron microscopy, the protein expression of AMP-activated protein kinase alpha (AMPKalpha) and phosphorylated AMP-activated protein kinase alpha (p-AMPKalpha) in myocardium were tested by Western blot.</p><p><b>RESULTS</b>The level of blood glucose, lipid, insulin and the insulin resistance index were increased in HF group and DM group, but they were decreased after the treatment with B06. The expression of AMPKalpha and p-AMPKalpha were decreased, but they became increased after the treatment of B06. There were increased collagen fibers in interstitium and expansion of mitochondria in cytoplasm of myocardium from DM group, but they were ameliorated in B06 treatment group.</p><p><b>CONCLUSION</b>It is suggested that B06 may relieve the damage of myocardium from type 2 diabetic rats and the increased expression of AMPKalpha and p-AMPKalpha may be involved in it.</p>