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- W3147448023 abstract "The chemotaxis of Dictysotelium discoideum cells in response to a chemical gradient of cyclic adenosine 3′,5′-monophosphate (cAMP) was studied using a newly designed microfluidic device. The device consists of 800 cell-sized channels in parallel, each 4 μm wide, 5 μm high, and 100 μm long, allowing us to prepare the same chemical gradient in all channels and observe the motility of 500–1000 individual cells simultaneously. The percentage of cells that exhibited directed migration was determined for various cAMP concentrations ranging from 0.1 pM to 10 μM. The results show that chemotaxis was highest at 100 nM cAMP, consistent with previous observations. At concentrations as low as 10 pM, about 16% of cells still exhibited chemotaxis, suggesting that the receptor occupancy of only 6 cAMP molecules/cell can induce chemotaxis in very sensitive cells. At 100 pM cAMP, chemotaxis was suppressed due to the self-production and secretion of intracellular cAMP induced by extracellular cAMP. Overall, systematic observations of a large number of individual cells under the same chemical gradients revealed the heterogeneity of chemotaxis responses in a genetically homogeneous cell population, especially the existence of a sub-population with extremely high sensitivity for chemotaxis." @default.
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- W3147448023 date "2021-05-01" @default.
- W3147448023 modified "2023-10-03" @default.
- W3147448023 title "A sub-population of Dictyostelium discoideum cells shows extremely high sensitivity to cAMP for directional migration" @default.
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- W3147448023 doi "https://doi.org/10.1016/j.bbrc.2021.03.095" @default.
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