ELIZA

return kwic search for lower out of >500 occurrences
288686 occurrences (No.85 in the rank) during 5 years in the PubMed. [no cache] 500 found

32) The lowest toxic NP dose at the ALI generated peak intracellular Zn(2+) values that were nearly three-folds lower than the peak values generated by the lowest toxic dose of NPs in submerged cultures, and eight-folds lower than the peak values generated by the lowest toxic dose of ZnSO4 or Zn(2+).

--- ABSTRACT ---

PMID:24289294 DOI:10.3109/17435390.2013.859319

2015 Nanotoxicology

* Intracellular accumulation dynamics and fate of zinc ions in alveolar epithelial cells exposed to airborne ZnO nanoparticles at the air-liquid interface.

- Airborne nanoparticles (NPs) that enter the respiratory tract are likely to reach the alveolar region. Accumulating observations support a role for zinc oxide (ZnO) NP dissolution in toxicity, but the majority of in-vitro studies were conducted in cells exposed to NPs in growth media, where large doses of dissolved ions are shed into the exposure solution. To determine the precise intracellular accumulation dynamics and fate of zinc ions (Zn(2+)) shed by airborne NPs in the cellular environment, we exposed alveolar epithelial cells to aerosolized NPs at the air-liquid interface (ALI). Using a fluorescent indicator for Zn(2+), together with organelle-specific fluorescent proteins, we quantified Zn(2+) in single cells and organelles over time. We found that at the ALI, intracellular Zn(2+) values peaked 3 h post exposure and decayed to normal values by 12 h, while in submerged cultures, intracellular Zn(2+) values continued to increase over time. The lowest toxic NP dose at the ALI generated peak intracellular Zn(2+) values that were nearly three-folds lower than the peak values generated by the lowest toxic dose of NPs in submerged cultures, and eight-folds lower than the peak values generated by the lowest toxic dose of ZnSO4 or Zn(2+). At the ALI, the majority of intracellular Zn(2+) was found in endosomes and lysosomes as early as 1 h post exposure. In contrast, the majority of intracellular Zn(2+) following exposures to ZnSO4 was found in other larger vesicles, with less than 10% in endosomes and lysosomes. Together, our observations indicate that low but critical levels of intracellular Zn(2+) have to be reached, concentrated specifically in endosomes and lysosomes, for toxicity to occur, and point to the focal dissolution of the NPs in the cellular environment and the accumulation of the ions specifically in endosomes and lysosomes as the processes underlying the potent toxicity of airborne ZnO NPs.

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(1)38 than	(19)4 incidence	(37)3 socioeconomic	(55)2 expression
(2)35 in	(20)4 leg	(38)3 stresses	(56)2 eyelid
(3)19 levels	(21)4 spine	(39)3 values	(57)2 eyelids
(4)12 extremity	(22)4 total	(40)2 Condom	(58)2 frequencies
(5)11 risk	(23)3 (P	(41)2 EI	(59)2 frequency
(6)7 compared	(24)3 null	(42)2 IQ	(60)2 likelihood
(7)7 level	(25)3 ASM/wt	(43)2 abdominal	(61)2 limit
(8)7 limb	(26)3 education	(44)2 among	(62)2 microleakage
(9)5 at	(27)3 educational	(45)2 back	(63)2 perceived
(10)5 for	(28)3 extremities,	(46)2 birthweight	(64)2 percentage
(11)5 limbs	(29)3 heart	(47)2 bounds	(65)2 quality
(12)5 the	(30)3 initial	(48)2 by	(66)2 rate
(13)4 and	(31)3 legs	(49)2 complication	(67)2 resilience
(14)4 body	(32)3 mean	(50)2 concentration	(68)2 serum
(15)4 cervical	(33)3 odds	(51)2 concentrations	(69)2 shear
(16)4 dose	(34)3 prevalence	(52)2 demineralization
(17)4 doses	(35)3 probability	(53)2 esophageal
(18)4 extremities	(36)3 sexual	(54)2 estimated

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--- WordNet output for lower --- =>1.低くする/なる, 下げる/下がる, 卑しめる, 2.しかめっ面, 3.lowの比較級 Overview of noun lower The noun lower has 1 sense (no senses from tagged texts) 1. lower berth, lower -- (the lower of two berths) Overview of verb lower The verb lower has 5 senses (first 3 from tagged texts) 1. (15) lower, take down, let down, get down, bring down -- (move something or somebody to a lower position; "take down the vase from the shelf") 2. (6) lower, lour -- (set lower; "lower a rating"; "lower expectations") 3. (1) turn down, lower, lour -- (make lower or quieter; "turn down the volume of a radio") 4. lower, depress -- (cause to drop or sink; "The lack of rain had depressed the water level in the reservoir") 5. frown, glower, lour, lower -- (look angry or sullen, wrinkle one's forehead, as if to signal disapproval) Overview of adj low The adj low has 10 senses (first 6 from tagged texts) 1. (55) low -- (less than normal in degree or intensity or amount; "low prices"; "the reservoir is low") 2. (23) low -- (literal meanings; being at or having a relatively small elevation or upward extension; "low ceilings"; "low clouds"; "low hills"; "the sun is low"; "low furniture"; "a low bow") 3. (11) low, low-toned -- (very low in volume; "a low murmur"; "the low-toned murmur of the surf") 4. (6) low -- (unrefined in character; "low comedy") 5. (4) low, low-pitched -- (used of sounds and voices; low in pitch or frequency) 6. (3) abject, low, low-down, miserable, scummy, scurvy -- (of the most contemptible kind; "abject cowardice"; "a low stunt to pull"; "a low-down sneak"; "his miserable treatment of his family"; "You miserable skunk!"; "a scummy rabble"; "a scurvy trick") 7. humble, low, lowly, modest, small -- (low or inferior in station or quality; "a humble cottage"; "a lowly parish priest"; "a modest man of the people"; "small beginnings") 8. depleted, low -- (no longer sufficient; "supplies are low"; "our funds are depleted") 9. broken, crushed, humbled, humiliated, low -- (subdued or brought low in condition or status; "brought low"; "a broken man"; "his broken spirit") 10. gloomy, grim, blue, depressed, dispirited, down, downcast, downhearted, down in the mouth, low, low-spirited -- (filled with melancholy and despondency ; "gloomy at the thought of what he had to face"; "gloomy predictions"; "a gloomy silence"; "took a grim view of the economy"; "the darkening mood"; "lonely and blue in a strange city"; "depressed by the loss of his job"; "a dispirited and resigned expression on her face"; "downcast after his defeat"; "feeling discouraged and downhearted") --- WordNet end ---