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74) To conclude, PNaAMPS hydrogel is an excellent feeder-free scaffold because of its simplicity, low cost and high efficiency in expanding a large number of miPS cells in vitro.
2015 Journal of tissue engineering and regenerative medicine
* Hydrogels as feeder-free scaffolds for long-term self-renewal of mouse induced pluripotent stem cells.
- Expanding undifferentiated induced pluripotent stem (iPS) cells in vitro is a basic requirement for application of iPS cells in both fundamental research and clinical regeneration. In this study, we intended to establish a simple, low cost and efficient method for the long-term self-renewal of mouse induced pluripotent stem (miPS) cells without using feeder-cells and adhesive proteins. Three scaffolds were selected for the long-term subculture of miPS cells over two months starting from passages 14 to 29: 1) a gelatin coated polystyrene (Gelatin-PS) that is a widely used scaffold for self-renewal of mouse embryonic stem (mES) cells; 2) a neutral hydrogel poly(N,N-dimethylacrylamide) (PDMAAm); and 3) a negatively charged hydrogel poly(2-acrylamido-2-methyl-propane sulfonic acid sodium salt) (PNaAMPS). Each passaged miPS cells on these scaffolds were cryopreserved successfully and the revived cells showed high viability and proliferation. The passaged miPS cells maintained a high undifferentiated state on all three scaffolds and a high level of pluripotency by expressing differentiation markers in vitro and forming teratomas in SCID mice with derivatives of all three germ layers. Compared to Gelatin-PS, the two hydrogels exhibited much better self-renewal performance in terms of high proliferation rate and level of expression of undifferentiated gene markers as well as efficiency in pluripotent teratoma formation. Furthermore, the PNaAMPS hydrogel demonstrated a slightly higher efficiency and simpler operation of cell expansion than the PDMAAm hydrogel. To conclude, PNaAMPS hydrogel is an excellent feeder-free scaffold because of its simplicity, low cost and high efficiency in expanding a large number of miPS cells in vitro.
=>安い, 低いところ, 卑劣に, 粗食で, 低い(もの), 弱い, 粗末な, 乏しい, 衿ぐりが深い, 建物の低い,
下劣な, 低級な
Overview of noun low
The noun low has 4 senses (no senses from tagged texts)
1. low, depression -- (an air mass of lower pressure; often brings precipitation; "a low moved in
over night bringing sleet and snow")
2. Low, David Low, Sir David Low, Sir David Alexander Cecil Low -- (British political cartoonist
(born in New Zealand) who created the character Colonel Blimp (1891-1963))
3. low -- (a low level or position or degree; "the stock market fell to a new low")
4. first gear, first, low gear, low -- (the lowest forward gear ratio in the gear box of a motor
vehicle; used to start a car moving)
Overview of verb low
The verb low has 1 sense (no senses from tagged texts)
1. moo, low -- (make a low noise, characteristic of bovines)
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")
Overview of adv low
The adv low has 1 sense (first 1 from tagged texts)
1. (3) low -- (in a low position; near the ground; "the branches hung low")
--- WordNet end ---