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Cisplatin cytotoxicity is dependent on cyclin-dependent kinase 2 (Cdk2) activity in vivo and in vitro.
Cells were prepared as previously described (45) and the samples were analyzed using FACSCalibur (Becton Dickinson). TKPTS cells were photographed using an inverted microscope (Nikon Eclipse TE200, Melville, NY) with Hoffman optics before harvesting (30). Statistical significance between treated and nontreated cultures was done using Student's t-test with two-tailed distribution.
Previous results from our laboratory showed that cisplatin-induced cytotoxicity is dependent on Cdk2 in vivo and in vitro (31). The large Universal first aid kit ideally used for camping, caravaning, travel, home and outdoor sports. Este importe incluye los aranceles, los impuestos, la corredurA­a y otras tarifas aplicables. Las tarifas de envA­o internacional e importaciA?n son pagadas en parte a Pitney Bowes Inc. Al enviar tu puja, te comprometes a comprar este artA­culo al vendedor si eres el pujador ganador. Si pulsas Confirmar, te comprometes a comprar este artA­culo al vendedor si eres el pujador ganador. Este vendedor exige que el comprador disponga de una cuenta PayPal para poder adquirir el artA­culo. Al pulsar el botA?n Puja directa, te comprometes a comprar este artA­culo al vendedor si ganas la subasta. Splint is built from a thin core of aluminum alloy, sandwiched between two layers of closed-cell foam.
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It causes tubular kidney damage by apoptosis and necrosis leading to acute kidney injury (10, 16, 28). Samples for Cdk2 immunoprecipiation were obtained from TKPTS cells by lysing cells as previously described.
For confocal studies, immunostaining was done on TKPTS cells grown on coverslips and infected with adenoviruses expressing Cdk2-F80G, Cdk2-GFP, and cyclin A, as indicated. El empaquetado debe ser el mismo que se encontrarA­a en una tienda, a menos que el artA­culo haya sido empaquetado por el fabricante con material no destinado a su venta en tienda (por ejemplo una bolsa o caja sin etiquetas).
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When expressed in mouse kidney cells, this protein was kinase inactive, did not inhibit endogenous Cdk2, but protected from cisplatin.
Previous studies from our laboratory showed that cell cycle inhibitory drugs protect both cultured kidney cells in vitro and mouse kidneys in vivo from cisplatin toxicity (30, 31), and this protection was later shown to be dependent on cyclin-dependent kinase 2 (Cdk2) inhibition (31). Cisplatin was added to cultures, where indicated, to a final concentration of 25 ?M when cells were ?75% confluent, and the cells were grown for an additional 24 h.
Protein extracts (200 ?g) were immunoprecipitated with agarose-immobilized antibodies against Cdk2 and cyclin A (Santa Cruz Biotechnology), dsred (anti-mCherry; CLONTECH). Twenty-four hours later, cells were fixed in 4% neutral buffered formaldehyde for 10 min followed by incubation with blocking serum for 10 min.
We constructed several mutants of Cdk2 to investigate their effects on cisplatin cytotoxicity.
Si resides en un Estado Miembro de la UE aparte de Reino Unido, el IVA de importaciA?n de esta compra no es recuperable. Items must be returned unused and packed properly to ensure they are not damaged while in transit. The mutant was localized in the cytoplasm, but when coexpressed with cyclin A, it was activated, localized to the nucleus, and no longer protected from cisplatin cytotoxicity. Cdk2-F80G, Cdk2-GFP, and cyclin A adenoviruses were added where indicated to a final multiplicity of infection (MOI) of 100. For each culture condition, >1 ? 105 cells were analyzed and the experiment was repeated three times.
Precipitated agarose beads were washed three times with lysis buffer and loaded on 12% SDS-PAGE. Cells were then incubated with primary antibody for Golgi apparatus (GM-130, BD Transduction Laboratories, San Diego, CA), cytochrome c (BD Transduction Laboratories), or Endo G (ABCAM, Cambridge, MA). One mutant, where phenylalanine at position 80 was replaced by glycine (Cdk2-F80G), protected cells from cisplatin-induced cell death (Fig.
Cells exposed to cisplatin in the presence of the activated mutant had an apoptotic phenotype, and endonuclease G was released from mitochondria similar to that mediated by endogenous Cdk2.
Apart from its role in proliferation, several studies suggest that Cdk2 plays an important role in cell death. For colocalization of Cdk2-F80G and Cdk2-GFP, the high intensity of the mCherry fluorescence necessitated lowering the MOI to 10 so that the protein expression levels, as well as transduction efficiency, were significantly lowered. The reaction was stopped by addition of Laemmli buffer (20), samples were boiled for 5 min, and then loaded on 12% SDS-PAGE. But unlike apoptosis mediated by wild-type Cdk2, cisplatin exposure of cells expressing the activated mutant did not cause cytochrome c release or significant caspase-3 activation.
Data showed increased Cdk2 activity in cells undergoing apoptosis (13, 29), and cell death was accelerated in cells with induced Cdk2 activity (9, 21). The change of expression levels from those transductions using 100 MOI did not influence protein localizations. DAPI (Vector, Burlingame, CA) staining was performed at the final step for 10 min to visualize nuclei.
Cell death in the presence or absence of 25 ?M cisplatin was determined by light microscopy (Fig.


We conclude that cisplatin likely activates both caspase-dependent and -independent cell death, and Cdk2 is required for both pathways. Cdk2-F80G was created by site-directed mutagenesis using the Stratagene Quickchange kit (Stratagene, La Jolla, CA) to change the codon for Phenylalanine 80 (TTT) to a Glycine codon (GGG). The mutant-inactive Cdk2 protected from both death pathways, but after activation by excess cyclin A, caspase-independent cell death predominated. The primers (Integrated DNA Technologies, Coralville, IA) used were 5?-CTC TAC CTG GTT GGG GAA TTT CTG CAC C-3?, 5?-GGT GCA GAA ATT CCC CAA CCA GGT AGA G-3?. To obtain three-dimensional (3-D) images, Z-series taken by confocal microscopy were reconstituted by Huygens Professional software (Scientific Volume Imaging, The Netherlands software).
Similarly, it was shown that Cdk2 regulated apoptosis during ischemic heart injury in vivo and in cultured cardiac myocytes (23). Electrophoresed samples were transferred to nitrocellulose membrane and blocked with 5% milk in Tris-buffered saline Tween 20, and the membrane was incubated overnight at 4°C with primary antibody with constant shaking. 4, 5, 6, 8 and supplemental movies were selected based on the quality of cell morphology, protein expression, and staining intensity (the online version of this article contains supplemental data). Bound proteins to the secondary antibody were visualized using ECL (Amersham Biosciences, Piscataway, NJ). However, the protein localizations represented were typical of those found in almost all of similarly treated cells.
The primary antibodies used were Cdk2 (M2) polyclonal antibody (Santa Cruz Biotechnology) and caspase-3 polyclonal antibody (Cell Signaling, Danvers, MA). After initiation, most pathways lead to disruption of the outer membrane of mitochondria and to release of mitochondrial proteins, such as cytochrome c (25). The Cdk2-F80G adenovirus used in these studies was constructed as a mCherry (37) fusion protein to assist in localization. In the cytosol, cytochrome c induces conformational change in apoptosis protease-activating factor 1 leading to activation of caspase-9 and downstream executioner proteases, caspase-3 and -7, causing caspase-dependent apoptosis. No functional differences were noted to be caused by the presence of the mCherry epitope (data not presented).
Other proteins such as apoptosis-inducing factor (AIF) (38) and endonuclease G (Endo G) (22) can also be released from mitochondria and could mediate caspase-independent apoptosis.
It is still unclear which cell death pathways initiate cascades resulting in cisplatin cytotoxicity and which amplify these cascades.In the present study, we examined the role of Cdk2 in cisplatin-induced cell death in mouse kidney proximal tubule (TKPTS) cells using a mutant Cdk2 (Cdk2-F80G) that protected from cytotoxicity. When expressed in TKPTS cells, the Cdk2-F80G protein was kinase inactive, with cytoplasmic localization, and protected from cisplatin cytotoxicity. When coexpressed with excess cyclin A, it was kinase active, localized to the nucleus, and no longer protected from cisplatin.
Amplification of recombinant adenoviruses was done in HEK-293 cells, purified by CsCl gradients, and stored at ?20°C.
Activation of Cdk2-F80G continues to inhibit the caspase-dependent pathway, but cell death is still caused by a caspase-independent pathway.



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