SKOV-3TR
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
SUBMITTER: Ahmed Ahmed
PROVIDER: E-GEOD-2627 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Publications
The extracellular matrix protein TGFBI induces microtubule stabilization and sensitizes ovarian cancers to paclitaxel.
Ahmed Ahmed Ashour AA Mills Anthony D AD Ibrahim Ashraf E K AE Temple Jillian J Blenkiron Cherie C Vias Maria M Massie Charlie E CE Iyer N Gopalakrishna NG McGeoch Adam A Crawford Robin R Nicke Barbara B Downward Julian J Swanton Charles C Bell Stephen D SD Earl Helena M HM Laskey Ronald A RA Caldas Carlos C Brenton James D JD
Cancer cell 20071201 6
The extracellular matrix (ECM) can induce chemotherapy resistance via AKT-mediated inhibition of apoptosis. Here, we show that loss of the ECM protein TGFBI (transforming growth factor beta induced) is sufficient to induce specific resistance to paclitaxel and mitotic spindle abnormalities in ovarian cancer cells. Paclitaxel-resistant cells treated with recombinant TGFBI protein show integrin-dependent restoration of paclitaxel sensitivity via FAK- and Rho-dependent stabilization of microtubules ...[more]
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Project description:Drosophila melanogaster adult flies fed on normal food (NF) containing 16 mg/ml of pentylenetetrazole (PTZ) in the food show a hyperkinetic behavior within 24 hours. Half of that concentration, i.e., 8 mg/ml, of the PTZ, if fed for seven days, though doesn’t cause seizure-like behavior, results in a decreased climbing speed in flies. This change in locomotor behavior is progressive and becomes significant only on seventh day of the treatment. This climbing deficit is ameliorated when flies are treated concomitantly with PTZ and either of the two antiepileptic drugs (AEDs), sodium valproate (NaVP) or levetiracetam (LEV). Further experiments based on different regimes of combination and singular PTZ treatment demonstrated that whereas NaVP show a weaker prophylactic and stronger symptomatic effect, LEV exhibit an opposite effect, i.e., stronger prophylactic and weaker symptomatic action. 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Considering the above fly locomotor behavior model as relevant in kindling attainment, it was of obvious interest to study the behavioral and transcriptomic changes post-kindling, i.e., after withdrawing PTZ following seven day long chronic PTZ administration. It was observed that when PTZ is discontinued and flies climbing speed is monitored for next seven days of PTZ discontinuation, climbing speed deficit initially disappears and then a progressive increase in climbing speed is detected. Behavioral pharmacology of AEDs in post-kindling regime, like fly kindling described above, showed its usefulness in screening of potential antiepileptic, antiepileptogenic, disease-modifying and neuroprotective agents. The present submission relates to transcriptomic changes in fly head secondary to NaVP treatment following discontinuation of PTZ for seven days (after seven days of chronic PTZ treatment). To delineate possible prophylactic or symptomatic effect of NaVP at behavioral level, flies were treated with NaVP for first three days and then shifted to NF for next four days (3 + 4 day regime) or flies treated with NF for first four days and then drug treated for next three days (4 + 3 day regime), in that order. At transcriptomic level, we have now examined the effect of NaVP in 3 + 4 day regime. Gene expression profiles have been generated at both time points, 3rd and 7th day, i.e., on 10th and 14th day from the beginning of PTZ treatment. Effect of three day long chronic NaVP treatment on fly head microarray gene expression profile, in otherwise normally grown flies, has already been determined (earlier GEO submission). Similarly, transcriptomic changes after one day, three days and seven days of PTZ discontinuation (i.e., 8th, 10th and 14th day of the beginning of chronic PTZ treatment) have already been deciphered (earlier GEO submission). 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The labeled product was mixed with hybridization solution containing hybridization buffer (DIG Easy Hyb; Roche), 10 mg/ml salmon testis DNA (0.05 mg/ml final concentration, Sigma) and 10mg/ml yeast tRNA (0.05 mg/ml final concentration, Sigma). The hybridization mixture was denatured at 65ºC and applied onto cDNA microarray slides (D12Kv1, CDMC, Toronto, Canada). The slides were covered by a coverslip (ESCO, Portsmouth, USA) and hybridization was allowed to take place in hybridization chamber (Corning) at 37ºC for 16 hrs. Following hybridization, the coverslips were removed in a solution containing 1X SSC and 0.1% SDS at 50ºC, and the slides washed in 1X SSC and 0.1% SDS (three times for 15 minutes each) in a coplin jar at 50ºC with occasional swirling and then transferred to 1X SSC and washed with gentle swirling at room temperature (twice for 15 minutes each). 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Analyzable spots in at least three of the four biological replicates performed were retrieved for downstream analysis using Significance Analysis of Microarrays (SAM 3, Excel Add-In, Stanford) under the conditions of one class response, imputation and 100 permutations.
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