ELIZA

return kwic search for increase out of >500 occurrences
611425 occurrences (No.13 in the rank) during 5 years in the PubMed. [cache]

22) Our results showed that Nano-Co caused a dose- and time-dependent increase in Gadd45α expression, but Nano-TiO2 did not.

--- ABSTRACT ---

PMID:24277352 DOI:10.1002/tox.21926

2015 Environmental toxicology

* Up-regulation of Gadd45α after exposure to metal nanoparticles: the role of hypoxia inducible factor 1α.

- The increased development and use of nanoparticles in various fields may lead to increased exposure, directly affecting human health. Our current knowledge of the health effects of metal nanoparticles such as cobalt and titanium dioxide (Nano-Co and Nano-TiO2 ) is limited but suggests that some metal nanoparticles may cause genotoxic effects including cell cycle arrest, DNA damage, and apoptosis. The growth arrest and DNA damage-inducible 45α protein (Gadd45α) has been characterized as one of the key players in the cellular responses to a variety of DNA damaging agents. The aim of this study was to investigate the alteration of Gadd45α expression in mouse embryo fibroblasts (PW) exposed to metal nanoparticles and the possible mechanisms. Non-toxic doses of Nano-Co and Nano-TiO2 were selected to treat cells. Our results showed that Nano-Co caused a dose- and time-dependent increase in Gadd45α expression, but Nano-TiO2 did not. To investigate the potential pathways involved in Nano-Co-induced Gadd45α up-regulation, we measured the expression of hypoxia inducible factor 1α (HIF-1α) in PW cells exposed to Nano-Co and Nano-TiO2 . Our results showed that exposure to Nano-Co caused HIF-1α accumulation in the nucleus. In addition, hypoxia inducible factor 1α knock-out cells [HIF-1α (-/-)] and its wild-type cells [HIF-1α (+/+)] were used. Our results demonstrated that Nano-Co caused a dose- and time-dependent increase in Gadd45α expression in wild-type HIF-1α (+/+) cells, but only a slight increase in HIF-1α (-/-) cells. Pre-treatment of PW cells with heat shock protein 90 inhibitor, 17-(Allylamino)-17-demethoxygeldanamycin (17-AAG), prior to exposure to Nano-Co significantly abolished Nano-Co-induced Gadd45α expression. These results suggest that HIF-1α accumulation may be partially involved in the increased Gadd45α expression in cells exposed to Nano-Co. These findings may have important implications for understanding the potential health effects of metal nanoparticle exposure.

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(2)55 the	(8)5 was	(14)3 from	(20)2 between
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--- WordNet output for increase --- =>大きくなる, を増す, 増大させる, 強まる, 増加, 増える, 増やす Overview of noun increase The noun increase has 5 senses (first 5 from tagged texts) 1. (49) addition, increase, gain -- (a quantity that is added; "there was an addition to property taxes this year"; "they recorded the cattle's gain in weight over a period of weeks") 2. (21) increase -- (a change resulting in an increase; "the increase is scheduled for next month") 3. (7) increase, increment, growth -- (a process of becoming larger or longer or more numerous or more important; "the increase in unemployment"; "the growth of population") 4. (3) increase, increment -- (the amount by which something increases; "they proposed an increase of 15 percent in the fare") 5. (3) increase, step-up -- (the act of increasing something; "he gave me an increase in salary") Overview of verb increase The verb increase has 2 senses (first 2 from tagged texts) 1. (86) increase -- (become bigger or greater in amount; "The amount of work increased") 2. (61) increase -- (make bigger or more; "The boss finally increased her salary"; "The university increased the number of students it admitted") --- WordNet end ---