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排序方式: 共有263条查询结果,搜索用时 734 毫秒
261.
Leonardo Thiago Duarte Barreto Nobre Arthur Anthunes Jacome Vidal Jailma Almeida-Lima Ruth Medeiros Oliveira Edgar Jean Paredes-Gamero Valquiria Pereira Medeiros Edvaldo Silva Trindade Celia Regina Cavichiolo Franco Helena Bonciani Nader Hugo Alexandre Oliveira Rocha 《Carbohydrate polymers》2013
Fucan is a term used to denominate sulfated l-fucose rich polysaccharides. Here, a heterofucan, named fucan B, was extracted from the Spatoglossum schröederi seaweed. This 21.5 kDa galactofucan inhibited CHO-K1 proliferation and migration when fibronectin was the substrate. Fucan B derivatives revealed that such effects depend on their degree of sulfation. Fucan B did not induce cell death, but promoted G1 cell cycle arrest. Western blotting and flow cytometry analysis suggest that fucan B binds to fibronectin and activates integrin, mainly integrin α5β1, which induces FAK/RAS/MEK/ERK activation. FAK activation inhibits CHO-K1 migration on fibronectin and ERK blocks cell cycle progression. This study indicates that fucan B could be applied in developing new antitumor drugs. 相似文献
262.
263.
Poliana de Oliveira Figueiredo André Tavares da Silva-Fernandes Bruno Eduardo Fernandes Mota Galileu Barbosa Costa Iara Apolinário Borges Paulo César Peregrino Ferreira J?natas Santos Abrah?o Erika Martins Braga Erna Geessien Kroon Giliane de Souza Trindade 《Memórias do Instituto Oswaldo Cruz》2015,110(6):804-808
Vaccinia virus naturally circulates in Brazil and is the causative agent of a
zoonotic disease known as bovine vaccinia (BV). We retrospectively evaluated two
populations from the Amazon and Southeast Regions. BV outbreaks had not been reported
in these regions before sample collection. Neutralising antibodies were found in 13
individuals (n = 132) with titres ranging from 100 ≥ 6,400 neutralising units/mL.
Univariate analysis identified age and vaccination as statistically significant risk
factors in individuals from the Southeast Region. The absence of detectable
antibodies in vaccinated individuals raises questions about the protection of
smallpox vaccine years after vaccination and reinforces the need for surveillance of
Orthopoxvirus in Brazilian populations without evidence of previous outbreaks. 相似文献