Browsing by Author "Ke, Chun-Yen"

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Prophylactic acetylsalicylic acid attenuates the inflammatory response but fails to protect exercise-induced liver damage in exercised rats
(2016-09-05)
Huang, Kuo-Chin
;
Chiu, Yi-Han
;
Liao, Kuang-Wen
;
Ke, Chun-Yen
;
Lee, Chung-Jen
This study evaluated the effects of acetylsalicylic acid (ASA) on exercise-induced inflammatory response, muscle damage, and liver injury in rats. Wistar-Kyoto (WKY) rats were divided into six groups: control (C), exercise (E), C+20 mg ASA, E+20 mg ASA, C+100 mg/kg ASA, and E+100 mg ASA groups. ASA or a vehicle was orally administered through gavage 1 h before a treadmill test. Upon trial completion, blood was drawn at 1, 12, and 24 h for biochemical analysis, and livers were excised at 24 h for a histological assessment. Our results revealed that 100 mg/kg ASA significantly reduced interleukin (IL)-6 and tumor necrosis factor (TNF)-alpha levels in the E groups; however, the IL-10 level was considerably increased. Moreover, aspartate aminotransferase (AST), alanine aminotransferase (ALT) levels and histological hepatic damage increased significantly in the E+100 mg ASA group compared with the corresponding changes in the E group. These results suggest that the prophylactic administration of particularly high dose ASA alleviates exercise-induced inflammatory response but exacerbates liver injury. (C) 2016 Elsevier B.V. All rights reserved.
The inhibitory effect of 7, 7 ''-dimethoxyagastisflavone on the metastasis of melanoma cells via the suppression of F-actin polymerization
(2017-09-01)
Lin, Ching-Min
;
Lin, Yu-Ling
;
Ho, Shu-Yi
;
Chen, Pin-Rong
;
Tsai, Yi-Hsuan
7,7"-Dimethoxyagastisflavone (DMGF), a biflavonoid isolated from Taxus x media cv. Hicksii, induces apoptotic and autophagic cell death. However, whether DMGF suppresses tumor metastasis is unclear. The aim of this study was to investigate the anti-metastatic activities of DMGF on the metastatic processes of melanoma cells in vivo and in vitro. A transwell assay showed that DMGF could effectively attenuate the motility of B16F10 cells, and the results of real-time PCR revealed that DMGF also suppressed the expressions of matrix metalloproteinase-2 (MMP-2). Moreover, DMGF did not influence tube formation but inhibited the migration of endothelial cells. Furthermore, animal models were used to monitor the effects of DMGF on tumor metastasis, and all models showed that DMGF significantly suppressed the metastatic behaviors of B16F10 cells, including intravasation, colonization, and invasion of the lymphatic duct. In addition, DMGF could also reduce the densities of the blood vessels in the tumor area in vivo. Further investigation of the molecular mechanisms of anti-metastatic activity revealed that DMGF can down-regulate the levels of key modulators of the Cdc42/Rac1 pathway to interfere in F-actin polymerization and suppress the formation of lamellipodia by reducing the phosphorylation of CREB. These data suggested that DMGF presents anti-metastatic activities in B16F10 melanoma cells. Here, we demonstrated that DMGF can inhibit the metastasis of highly invasive melanoma cancer cells through the down-regulation of F-actin polymerization. Considering these findings, DMGF may be further developed to serve as a chemoprevention drug for patients with metastatic melanoma.
Vitamin D-3 Reduces Tissue Damage and Oxidative Stress Caused by Exhaustive Exercise
(2016-01-01)
Ke, Chun-Yen
;
Yang, Fwu-Lin
;
Wu, Wen-Tien
;
Chung, Chen-Han
;
Lee, Ru-Ping
Exhaustive exercise results in inflammation and oxidative stress, which can damage tissue. Previous studies have shown that vitamin D has both anti-inflammatory and antiperoxidative activity. Therefore, we aimed to test if vitamin D could reduce the damage caused by exhaustive exercise. Rats were randomized to one of four groups: control, vitamin D, exercise, and vitamin D+exercise. Exercised rats received an intravenous injection of vitamin D (1 ng/mL) or normal saline after exhaustive exercise. Blood pressure, heart rate, and blood samples were collected for biochemical testing. Histological examination and immunohistochemical (IHC) analyses were performed on lungs and kidneys after the animals were sacrificed. In comparison to the exercise group, blood markers of skeletal muscle damage, creatine kinase and lactate dehydrogenase, were significantly (P < 0.05) lower in the vitamin D+exercise group. The exercise group also had more severe tissue injury scores in the lungs (average of 2.4 +/- 0.71) and kidneys (average of 3.3 +/- 0.6) than the vitamin D-treated exercise group did (1.08 +/- 0.57 and 1.16 +/- 0.55). IHC staining showed that vitamin D reduced the oxidative product 4-Hydroxynonenal in exercised animals from 20.6% to 13.8% in the lungs and from 29.4% to 16.7% in the kidneys. In summary, postexercise intravenous injection of vitamin D can reduce the peroxidation induced by exhaustive exercise and ameliorate tissue damage, particularly in the kidneys and lungs.