• Nutrition Research and Practice
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• 제8권4호
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• pp.352-359
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• 2014

BACKGROUND/OBJECTIVES: In this study, we determined the anti-inflammatory activities and the underlying molecular mechanisms of the methanol extract from Erigeron Canadensis L. (ECM) in LPS-stimulated RAW264.7 macrophage cells. MATERIALS/METHODS: The potential anti-inflammatory properties of ECM were investigated by using RAW264.7 macrophages. We used western blot assays and real time quantitative polymerase chain reaction to detect protein and mRNA expression, respectively. Luciferase assays were performed to determine the transactivity of transcription factors. RESULTS: ECM significantly inhibited inducible nitric oxide synthase (iNOS)-derived NO and cyclooxygenase-2 (COX-2) derived PGE2 production in LPS-stimulated RAW264.7 macrophages. These inhibitory effects of ECM were accompanied by decreases in LPS-induced nuclear translocations and transactivities of $NF{\kappa}B$. Moreover, phosphorylation of mitogen-activated protein kinase (MAPKs) including extracellular signal-related kinase (ERK1/2), p38, and c-jun N-terminal kinase (JNK) was significantly suppressed by ECM in LPS-stimulated RAW264.7 macrophages. Further studies demonstrated that ECM by itself induced heme oxygenase-1 (HO-1) protein expression at the protein levels in dose-dependent manner. However, zinc protoporphyrin (ZnPP), a selective HO-1 inhibitor, abolished the ECM-induced suppression of NO production. CONCLUSIONS: These results suggested that ECM-induced HO-1 expression was partly responsible for the resulting anti-inflammatory effects. These findings suggest that ECM exerts anti-inflammatory actions and help to elucidate the mechanisms underlying the potential therapeutic values of Erigeron Canadensis L.

• Molecules and Cells
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• 제20권2호
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• pp.235-240
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• 2005

Extracts of pine needles (Pinus densiflora Sieb. et Zucc.) have diverse physiological and pharmacological actions. In this study we show that pine needle extract alters pacemaker currents in interstitial cells of Cajal (ICC) by modulating ATP-sensitive $K^+$ channels and that this effect is mediated by prostaglandins. In whole cell patches at $30^{\circ}C$, ICC generated spontaneous pacemaker potentials in the current clamp mode (I = 0), and inward currents (pacemaker currents) in the voltage clamp mode at a holding potential of -70 mV. Pine needle extract hyperpolarized the membrane potential, and in voltage clamp mode decreased both the frequency and amplitude of the pacemaker currents, and increased the resting currents in the outward direction. It also inhibited the pacemaker currents in a dose-dependent manner. Because the effects of pine needle extract on pacemaker currents were the same as those of pinacidil (an ATP-sensitive $K^+$ channel opener) we tested the effect of glibenclamide (an ATP-sensitive $K^+$ channels blocker) on ICC exposed to pine needle extract. The effects of pine needle extract on pacemaker currents were blocked by glibenclamide. To see whether production of prostaglandins (PGs) is involved in the inhibitory effect of pine needle extract on pacemaker currents, we tested the effects of naproxen, a non-selective cyclooxygenase (COX-1 and COX-2) inhibitor, and AH6809, a prostaglandin EP1 and EP2 receptor antagonist. Naproxen and AH6809 blocked the inhibitory effects of pine needle extract on ICC. These results indicate that pine needle extract inhibits the pacemaker currents of ICC by activating ATP-sensitive $K^+$ channels via the production of PGs.

• Clinics in Shoulder and Elbow
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• 제15권1호
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• pp.1-7
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• 2012

목적: 사각근간 상완 신경총 차단 하 회전근 개 복원술 후 다중 통증 조절법을 통한 초기통증 조절의 유용성을 확인해 보고자 하였다. 대상 및 방법: 회전근 개 전층 파열로 관절경 하 회전근 개 복원술을 시행한 80명의 환자들을 대상으로 하였다. 전례에서 술 전 마취로 사각근간 상완 신경총 차단을 시행하였고 수술 후 견봉하 공간에 Bupivacaine 유치 도관을 통한 일회성 통증 조절만 시행한 A군 (Group A : Local analgesia group)과 유치 도관 주사에 추가하여 경구 약물로 아편양 제재, 아세트아미노펜-트라마돌 복합제, 선택적 COX2 억제제를 사용하는 다중 통증 조절법을 시행한 B군 (Group B : Multimodal control group)으로 나누어 비교하였다. 수술 당일 야간, 술 후 1, 2, 3일 및 술 후 2주의 주간과 야간의 통증 점수 (visual analogue scale, VAS), 입원 중 추가 투여한 ketolorac 주사의 횟수와 약물과 관련된 부작용에 대해 비교, 분석을 하였다. 결과: 수술 당일 야간, 술 후 1, 2, 3일, 술 후 2주의 주간 및 야간의 평균 VAS는 A군에서 각각 7.4점, 7점/6.8점 (주/야), 4.5점/5.2점, 4.8점/5.0점, 2.2점/2.7점 이었으며 B군에서 각각 6.5점, 4.3점/5.4점, 3.2점/4.3점, 3.0점/4.1점, 2.4점/2.5점으로 수술 당일 야간과 수술 후 1,2,3일의 주간통 및 술 후1일의 야간통에서 각각 유의한 감소를 보였다 (p<0.05). A군과 B군의 하루 당 평균 ketolorac 투여 횟수는 각각1.1회, 0.5회였고 부작용의 차이는 없었다. 결론: 관절경적 회전근 개 복원술 후 다중 통증 조절법을 통한 초기 통증 조절은 효과적인 진통조절을 보여 환자의 만족도를 높일 수 있는 방법으로 생각되었다.

• Journal of Gastric Cancer
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• 제2권2호
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• pp.73-80
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• 2002

In spite the fact that H. pylori infection might be the causative organisms of acute and chronic gastritis, peptic ulcer diseases and the definition as the class I carcinogen by WHO IARC, still debates exist about the relationship between H. pylori and gastric carcinogenesis. Epidemiological and animal studies demonstrated a link between gastric cancer and chronic infection with H, pylori, but the exact mechanism responsible for the development of gastric cancer in H. pylori-infected patients still remain obscure. In order to declare the clear association, definate evidences like that decrement in the incidence of gastric cancer after the eradication of H. pylori in designated area compared to noneradicated region or the blockade of specific mechanism acting on the carcinogenesis by H. pylori infection. The other way is to identify the upregulating oncogenes or downregulating tumor suppressor genes specifically invovled in H. pylori-associated carcinogenesis. For that, we established the animal models using C57BL/6 mice strain. Already gastric carcinogenesis was developed in Mongolian gerbils infected with H. pylori, but there has been no development of gastric cancer in mice model infected with H. pylori after long-term evaluation. Significant changes such as atrophic gastritis were observed in mice model. However, we could observe the development of mucosal carcinoma in the stomach of transgenic mice featuring the loss of TGF-beta sig naling by the expressions of dominant negative forms of type II receptor specifically in the stomach. Moreover, the incidence of gastric adenocarcinoma was significantly increased in group administered with both MNU and H. pylori infection than MNU alone, signifying that H. pylori promoted the gastric carcinogenesis and there might be host susceptibility genes in H. pylori-associated gastric carcinogenesis. Based on the assumption that chronic, uncontrolled inflammation might predispose to carcinogenesis, there have been several evidences showing chronic atrophic gastritis predisposed to gastric carcinogenesis in H. pylori infection. Although definite outcome of chemoprevention was not drawn after the longterm administration of anti-inflammatory drug in H. pylori infection, the actual incidence of atrophic gastritis and molecular evidence of chemoprevention could be obtained. Selective COX-2 inhibitor was effective in decreasing the development of gastric carcinogenesis provoked by H. pylori infection and carcinogen like in chemoprevention of colon carcinogenesis.