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Background: Piperlongumine (PL) is an alkaloid compound extracted from piperlongum. Many studies have shown that PL has anti-tumor effects on a variety of tumor cells in vivo and in vitro. However, the specific mechanism needs to be further explored. Aims: To investigate the regulatory mechanism of PL on the expression of TERT in gastric cancer cells. Methods: Gastric cancer cells were treated with different doses of PL, AG490, respectively. CCK-8 and plate colony formation experiment were used to detect cell viability. Real-time fluorescent quantitative PCR was used to detect the expression of TERT mRNA. Western blotting was used to detect the protein expressions of TERT, STAT3, p-STAT3 and DNMT1. TRAP-ELISA was used to determine the telomerase activity. Luciferase reporter gene was used to detect the TERT promoter activity. Results: Compared with control group, gastric cancer cells viability in PL group was significantly decreased, colony formation ability was significantly reduced, TERT mRNA and protein expressions, as well as telomerase activity were significantly reduced, p-STAT3 and DNMT1 protein expressions were significantly downregulated. AG490 significantly inhibited gastric cancer cells viability, protein expressions of p-STAT3, DNMT1 and TERT. Conclusions: PL may inhibit gastric cancer cells viability through regulation of TERT expression via STAT3-mediated epigenetic regulation and it may become a new target drug for the treatment of gastric cancer in future.
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Objective To establish a rapid modified Local lymph node assay ( LLNA) for the sensitization and irritancy potential of chemicals, and evaluate cosmetics products. Methods 3 kinds of chemicals ( 2 , 4-Dinitrochlorobenzene ( DNCB) , Eugenol and Hexyl cinnamic aldehyde) and 3 kinds of cosmetics were selected.The dorsal sides of both ears of female BALB/c mice were treated with 25μL/ear of the test solutions on 3 consecutive days, and the thickness of each ear was measured.BrdU solution was injected inter-peritoneally on day 5.On day 6, each auricle was weighed, the bilateral draining auricular lymph nodes were excised and weighed, then made into single cell suspension.BrdU was measured by ELISA using a commercial kit.Results Ear swelling and auricle weight of DNCB ( 1.0%) , Eugenol ( 25% and 50%) and number 3 cream foundation increased significantly ( P <0.05 or P <0.01), which may be considered as irritants.The others were negative.For LLNA, three chemicals and number 3 cream foundation pretended positive.Conclusion The combined LLNA/ear swelling/ear weight assay appears to be a reliable predictor of sensitization and irritancy potential, and is expected to play an important role in safety evaluation of cosmetics.
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BACKGROUND: Resent studies demonstrate that sciatica is caused by inflammatory reaction of nucleus pulposus, and dorsal root ganglion (DRG) is in involved in this process; however, its pathophysiological changes remain poorly understood. OBJECTIVE: To explore pathogenesis of sciatica related to nucleus pulposus protrusion without mechanical compression. METHODS: Totally 24 male SD rats were randomly divided into the experimental group and control group, with 12 rats in each group, The coccygeal intarvartebral discs of rats were opened to obtain 5 coccygeal nucleus pulposus, mixed with 50 μL physiological saline to prepare suspension. Rats in the experimental group were prepared non-compressive models by injecting suspension to the epidural cavum of rats. Meantime, the same volumes of physiological saline were injected into rats in the control group. The rat hind paw mechanical withdrawal thresholds were measured, pain-related behavior and dorsal root ganglion morphology were observed. RESULTS AND CONCLUSION: In the absence of mechanical pressure, disappearance of the nucleolus, degeneration of the nuclear membrane and significant hyperalgesia derived by auto-transplantation of nucleus pulposus to the epidural cavum of rats were observed. Dorsal root ganglion cells often had hyperemia, edema and intracytoplasmic vacuoles, with large and irregular nuclei. Prominent Nissl bodies were not seen. The Inflammatory reaction derived by autograft nucleus pulpcsus is an important factor in DRG injury and sciatica.
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Objective To evaluate the narrow-band imaging (NBI) in differential diagnosis of colo-rectal proliferative lesions. Methods Suspected lesions in colon were examined with white light and NBI colonoscopy, respectively. The ensitivity and specificity in diagnosing colorectal inflammatory hyperplasia, adenoma, early cancer and advanced cancer were compared between NBI and conventional colonoscopy with reference to pathology as gold standard. The pit patterns and the surface microvessels of the lesions were also determined and scored with NBI combined with magnifying endoscopy, and were compared with pathological diagnosis. Results (1) A total of 368 lesions were detected in 280 patients with conventional colonoscopy and NBI. The sensitivity and specificity of NBI in differential diagnosis of colorectal lesions were superior to those of conventional colonoscopy. (2) The pit patterns of colorectal inflammatory hyperplasia were mainly type Ⅰ and Ⅱ , while in adenomas were mainly type Ⅱ and Ⅲ (94. 2%). The pit patterns of early cancer were type Ⅲ (18. 8%), Ⅳ (56. 3%) and Ⅴ (25.0%), and those of advanced cancer were mainly type Ⅴ (94. 0%). (3) The average scores of surface microvesseis of colorectal inflammatory hyperplasia, ade-noma, early cancer and advanced cancer were 1.35 ± 0. 72, 3. 86 ±1.07, 6. 52±2. 59 and 11.42 ± 3.59, respectively. Scores over 6. 5 was a strong indicator of malignant lesions. Conclusion NBI is superior to conventional eolonoscopy in differential diagnosis of colorectal lesions. Observing pit patterns and microves-sels of the lesion with combination of NBI and magnifying endoscopy is helpful in diagnosis.
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Aseptic loosening of the prosthesis due to periprosthetic osteolysis is one of the main causes that affect the service life following artificial joint replacement. The patient should undergo revision of artificial joints,but the surgery is of high difficulty,high risk and excessive cost,etc. Therefore,using nonsurgical technique to control artificial prosthesis osteolysis is an urgent and realistic task. Currently,the drug prevents osteolysis through inhibiting osteoclast bone resorption,responding to cytokines,and promoting bone formation. In addition,gene therapy and other treatments for osteolysis are under exploration.
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[Objective]To detect the effect of Etanercept on the Ti particles induced TNF-?IL-1 and IL-6 production by macrophage and to evaluate the validity of the etanercept on treatment of aseptic loosening of prosthesis.[Method]Separate and Cultivate mouse peritoneal macrophages were divide into 5 groups after 24 h.Group A was treated with M? alone,group B with M?+Ti particles,group C with M?+Ti particles + etanercept(10 ng/ml),group D with M? Ti particles + etanercept(100 ng/ml),group E with M? + Ti particles + etanercept(1000 ng/ml).After 18 h,the production of TNF-? IL-1 and IL-6 in culture supernatants was detected by ELISA.[Result]The levels of TNF-? IL-1 and IL-6 production were much higher in group B than those in group A,D,E(P0.05).[Conclusion]Is shows the Ti particles could stimulate M? to excrete profuse TNF-? IL-1 and IL-6 production,etanercept can significantly inhibited the production of TNF-? IL-1 and IL-6 secreted by Ti particles induced macrophages in a dose-dependent manner and hope to be a therapeutic candidate for the prevention of aseptic loosening.