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排序方式: 共有96条查询结果,搜索用时 15 毫秒
91.
Clinical and immunohistochemical evidence suggests the possible significance of electrical stimulation of the secondary somatosensory cortex (S-II) as an analgesic therapy. The aim of the present study was to gain behavioral evidence for S-II stimulation-induced antinociception in conscious rats and to evaluate if the evoked antinociception can be potentiated by the neuronal NO synthase inhibitor 7-nitro-indazole. S-II stimulation produced a weak antinociception in the formalin-induced nociception test, but not in the thermal or mechanical nociception tests. This effect was remarkably potentiated by systemic administration of 7-nitro-indazole at a small dose that had no effect by itself. Thus, our data provide behavioral evidence for S-II stimulation-induced analgesia and may also predict a novel therapeutic strategy in combination with NO synthase inhibitors. 相似文献
92.
Feingold KR Shigenaga JK Cross AS Moser A Grunfeld C 《Biochemical and biophysical research communications》2012,421(3):612-615
Angiopoietin like protein 4 (ANGPTL4) inhibits lipoprotein lipase (LPL) activity. Previous studies have shown that Toll-like Receptor (TLR) activation increases serum levels of ANGPTL4 and expression of ANGPTL4 in liver, heart, muscle, and adipose tissue in mice. ANGPTL4 is expressed in macrophages and is induced by inflammatory saturated fatty acids. The absence of ANGPTL4 leads to the increased uptake of pro-inflammatory saturated fatty acids by macrophages in the mesentery lymph nodes due to the failure of ANGPTL4 to inhibit LPL activity, resulting in peritonitis, intestinal fibrosis, weight loss, and death. Here we determined the effect of TLR activation on the expression of macrophage ANGPTL4. LPS treatment resulted in a 70% decrease in ANGPTL4 expression in mouse spleen, a tissue enriched in macrophages. In mouse peritoneal macrophages, LPS treatment also markedly decreased ANGPTL4 expression. In RAW cells, a macrophage cell line, LPS, zymosan, poly I:C, and imiquimod all inhibited ANGPTL4 expression. In contrast, neither TNF, IL-1, nor IL-6 altered ANGPTL4 expression. Finally, in cholesterol loaded macrophages, LPS treatment still decreased ANGPTL4 expression. Thus, while in most tissues ANGPTL4 expression is stimulated by inflammatory stimuli, in macrophages TLR activators inhibit ANGPTL4 expression, which could lead to a variety of down-stream effects important in host defense and wound repair. 相似文献
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Yoshito Fujimoto Takuma Shiraki Yuji Horiuchi Tsuyoshi Waku Akira Shigenaga Akira Otaka Tsuyoshi Ikura Kazuhiko Igarashi Saburo Aimoto Shin-ichi Tate Kosuke Morikawa 《The Journal of biological chemistry》2010,285(5):3126-3132
The important roles of a nuclear receptor peroxisome proliferator-activated receptor γ (PPARγ) are widely accepted in various biological processes as well as metabolic diseases. Despite the worldwide quest for pharmaceutical manipulation of PPARγ activity through the ligand-binding domain, very little information about the activation mechanism of the N-terminal activation function-1 (AF-1) domain. Here, we demonstrate the molecular and structural basis of the phosphorylation-dependent regulation of PPARγ activity by a peptidyl-prolyl isomerase, Pin1. Pin1 interacts with the phosphorylated AF-1 domain, thereby inhibiting the polyubiquitination of PPARγ. The interaction and inhibition are dependent upon the WW domain of Pin1 but are independent of peptidyl-prolyl cis/trans-isomerase activity. Gene knockdown experiments revealed that Pin1 inhibits the PPARγ-dependent gene expression in THP-1 macrophage-like cells. Thus, our results suggest that Pin1 regulates macrophage function through the direct binding to the phosphorylated AF-1 domain of PPARγ. 相似文献
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