cell culture human a549 (ATCC)
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Cell Culture Human A549, supplied by ATCC, used in various techniques. Bioz Stars score: 99/100, based on 31642 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
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1) Product Images from "Myosin-Va restrains the trafficking of Na + /K + -ATPase-containing vesicles in alveolar epithelial cells"
Article Title: Myosin-Va restrains the trafficking of Na + /K + -ATPase-containing vesicles in alveolar epithelial cells
Journal: Journal of Cell Science
doi: 10.1242/jcs.046953
Figure Legend Snippet: cAMP increases Na+/K+-ATPase activity, protein abundance at the plasma membrane and the distance traveled by the Na+/K+-ATPase-containing vesicles in A549-GFPα1 cells. (A) A549-GFPα1 cells were incubated in the absence (CT) or presence of 50 μM forskolin (FSK) for 10 minutes and the Na+/K+-ATPase activity was measured as 86Rb+ uptake. Graph represents mean ± s.e.m. of three experiments. (B) A549-GFPα1 cells were incubated as in A, and the Na+/K+-ATPase abundance at the basolateral plasma membrane was determined by western blot of the BLM fraction using a specific antibody against GFP. E-cadherin was used as a loading control. Graph represents mean ± s.e.m. of three experiments. A representative western blot is shown. (C) The movement of the GFP-labeled particles was recorded as Metamorph stacks and vesicle trajectories were obtained by single-particle tracking using Metamorph software. Vesicles were randomly selected from those that showed plus-end-directed displacement. Left panel shows a representative image of A549-GFPα1 cells. Arrowhead indicates the vesicle whose trajectory is shown in the right panel before (CT) and after FSK treatment (FSK). (D) Average contour length traveled by the vesicles as a function of time. The black line represents control vesicles; at 60 seconds, upon addition of FSK (red line), the vesicles move at a faster rate. The average contour length is determined by averaging over many trajectories as described in the Materials and Methods. **P<0.01; ***P<0.001. Scale bars: 10 μm and 2 μm (magnified images).
Techniques Used: Activity Assay, Incubation, Western Blot, Labeling, Single-particle Tracking, Software
Figure Legend Snippet: The three isoforms of myosin-V are expressed in A549 cells. (A) RT-PCR using mRNA obtained from A549 and HeLa cells. Primers used for the amplification are described in supplementary material Table S6. (B) Cell lysates from A549 and HeLa cells were obtained and analyzed by western blot with specific antibodies against the three myosin-V isoforms. A representative western blot is shown. (C) The particulate fraction (100,000 g pellet) of A549-GFPα1 cells was loaded onto a flotation sucrose gradient and eight fractions were recovered. The distribution of the proteins of interest was analyzed by western blotting with specific antibodies. A representative western blot is shown. Rab5 and Rab7 are used as markers of early and late endosomes, respectively. (D) Gradients obtained in C were scanned and the marker content was digitally quantified as indicated. Results are expressed as percentage of the total amount of protein.
Techniques Used: Reverse Transcription Polymerase Chain Reaction, Amplification, Western Blot, Marker
Figure Legend Snippet: Myosin-Va and myosin-Vc colocalize with Na+/K+-ATPase. (A) A549-GFPα1 cells were incubated in the absence or presence of 50 μM FSK for 10 minutes, basolateral membranes (BLM) and intracellular compartments (IC) were isolated and the Na+/K+-ATPase abundance was determined by western blot using a specific antibody against GFP. E-cadherin and actin were used as loading controls for the BLM and IC fractions, respectively. Graph represents mean ± s.e.m. of three experiments. A representative western blot is shown. (B) The IC fraction of A549-GFPα1 cells was loaded onto a flotation sucrose gradient and eight fractions were recovered. The distribution of the proteins of interest was analyzed by western blotting with specific antibodies. A representative western blot is shown. C+, positive control.
Techniques Used: Incubation, Isolation, Western Blot, Positive Control
Figure Legend Snippet: The average speed of Na+/K+-ATPase-containing vesicles moving towards the cell periphery is increased in cells expressing a myosin-Va stalk-tail. (A) Live imaging of A549-GFPα1 cells (green) transiently transfected with a dominant-negative myosin-Va that has a m-cherry-tag (red) (m-cherry-DN-Va). The movement of the GFP-labeled particles was recorded. Upper panels show a representative image of the transfected A549-GFPα1 cells. Lower panels show the tracking of the movement of one vesicle before (CT) and after forskolin treatment (FSK). (B) Average contour length traveled by the vesicles in A as a function of time. The black line represents the control vesicles; FSK was added at time 60 seconds and is represented as a red line. (C) Live imaging of A549-GFPα1 cells (green) transiently transfected with a dominant-negative myosin-Vc that has a m-cherry-tag (red) (m-cherry-DN-Vc). The movement of the GFP-labeled particles was recorded. Upper panels show a representative image of the transfected A549-GFPα1 cells. Lower panels show the tracking of the movement of one vesicle before (CT) and after forskolin treatment (FSK). (D) Average contour length traveled by the vesicles in C as a function of time. The black line represents control vesicles; FSK was added at 60 seconds and is represented as the red line. Scale bars: 10 μm and 2 μm (magnified images).
Techniques Used: Expressing, Imaging, Transfection, Dominant Negative Mutation, Labeling
Figure Legend Snippet: The average speed of Na+/K+-ATPase-containing vesicles moving towards the cell periphery is increased in cells expressing a shRNA against myosin-Va. (A) Live imaging of A549-GFPα1 cells (green) transiently transfected with a shRNA against myosin-Va that has a m-cherry-tag (red) (m-cherry-sh-Va). The movement of the GFP-labeled particles was recorded. Upper panels show a representative image of the transfected A549-GFPα1 cells. Lower panels show the tracking of the movement of two vesicles (arrowheads) under control (CT) conditions. (B) Live imaging of A549-GFPα1 cells (green) transiently transfected with a shRNA against myosin-Vc that has a m-cherry-tag (red) (m-cherry-shRNA-Vc). The movement of the GFP-labeled particles was recorded. Upper panels show a representative image of the transfected A549-GFPα1 cells. Lower panels show the tracking of the movement of two vesicles (arrowheads) under control (CT) conditions (C). Graph represents the average contour length traveled by the vesicles as a function of time, calculated as described in methods. The black line represents the m-cherry-sh-Va vesicles and the red line, the m-cherry-sh-Vc vesicles. (D) A549-GFPα1 cells were transfected with a shRNA against myosin-Va or myosin-Vc, cell lysates were isolated and the myosin-Va (left panel) or myosin-Vc (right panel) abundance was determined by western blot using specific antibodies. E-cadherin and tubulin were used as loading controls. Scale bars: 10 μm and 4 μm (magnified images).
Techniques Used: Expressing, shRNA, Imaging, Transfection, Labeling, Isolation, Western Blot
Figure Legend Snippet: Dominant-negative myosin-Va mimics cAMP-mediated Na+/K+-ATPase increased activity and recruitment to the plasma membrane in A549-GFPα1 cells. (A) Stable clones expressing myosin-Va tail (DN-Va) and myosin-Vc tail (DN-Vc) were generated as described. Expression of the constructs in the permanent clones was analyzed by western blotting using and antibody against the V5 tag. A representative western blot is shown. (B) A549-GFPα1 cells (CT) and A549-GFPα1 cells permanently transfected with DN-Va and DN-Vc were incubated in the absence or presence of 50 μM FSK for 10 minutes and the Na+/K+-ATPase activity was measured as 86Rb+ uptake. Graph represents mean ± s.e.m. of three different experiments. (C) Control (CT), DN-Va and DN-Vc cells were incubated in the absence or presence of 50 μM FSK for 10 minutes and western blots of the basolateral membrane fraction were performed using a specific antibody against GFP. E-cadherin was used as loading control. A representative western blot is shown. *P<0.05; **P<0.01; n.s., not significant; u.s., unstimulated.
Techniques Used: Dominant Negative Mutation, Activity Assay, Clone Assay, Expressing, Generated, Construct, Western Blot, Transfection, Incubation
Figure Legend Snippet: Myosin-Va and the Na+/K+-ATPase-containing vesicles colocalize. A549-GFPα1 cells were fixed, permeabilized and blocked. Myosin-Va was visualized by using an anti-myosin-Va antibody and a secondary antibody labeled with Alexa Fluor 568. GFP was directly visualized. Cellular distribution of Na+/K+-ATPase-GFPα1 and myosin-Va was analyzed using a Zeiss LSM 510 laser-scanning confocal microscope and colocalization (blue) was determined using the LSM 510 Meta software.
Techniques Used: Labeling, Microscopy, Software
Figure Legend Snippet: Microtubules and actin filaments are involved in Na+/K+-ATPase traffic. (A) Live imaging of A549 cells incubated with 10 μM nocodazole for 3 hours. The movement of the GFP-labeled particles was recorded as Metamorph stacks and vesicle trajectories were obtained by single-particle tracking using Metamorph software. Upper panels show a representative immunofluorescence of the microtubule cytoskeleton in control (left) and nocodazole (right) conditions. Lower panel shows the tracking of the movement of one vesicle in control (left) and nocodazole (right) conditions. (B) Live imaging of A549 cells incubated with 5 μM cytochalasin D (Cyto D) for 1 hour. The movement of the GFP-labeled particles was recorded as Metamorph stacks and vesicle trajectories were obtained by single-particle tracking using Metamorph software. Upper panels show a representative immunofluorescence of the actin cytoskeleton under control (left) and cytochalasin D (right) conditions. Lower panel shows the tracking of the movement of one vesicle in control (left) and cytochalasin D (right) conditions. (C) Average contour length traveled by the vesicles as a function of time. The blue line represents the control vesicles; the black line, cells treated with cytochalasin D and the red line, cells treated with nocodazole. Scale bars: 10 μm and 2 μm (inset images).
Techniques Used: Imaging, Incubation, Labeling, Single-particle Tracking, Software, Immunofluorescence

