Ischemia reperfusion

Ischemia reperfusion www.selleckchem.com/products/Calcitriol-(Rocaltrol).html injury is a multifaceted damage, comprising effects on cardiomyocytes function and death and endothelial function. Due to Inhibitors,Modulators,Libraries the lack of effect on coronary flow by lixisenatide, we assume a direct effect on cardiomyocyte function and survival. Sonne and co workers found that GLP 1 amide, which is the first breakdown fragment of GLP 1 amide but not a GLP 1 receptor agonist, did not reduce infarct size but however increased functional recovery of ischemia hearts. Based on these finding the authors proposed that be side the known GLP 1 receptor another hitherto unidenti fied receptor could be responsible for effects of GLP 1 like peptides in rat hearts. Only a limited numbers of pre clinical studies have in vestigated so far effects of GLP 1 peptides on long term consequences Inhibitors,Modulators,Libraries after myocardial ischemia and reperfusion.

Using liraglutide, Noyan Ashraf and coworkers demon Inhibitors,Modulators,Libraries strated cardioprotection after myocardial infarction in diabetic and non diabetic mice. Liu and coworkers treated rats two weeks after myocardial infarction with either GLP 1 or the exenatide analog AC3174 and noticed improved cardiac function and morphology. In contrast to those previous studies, we performed only a transient and not permanent Inhibitors,Modulators,Libraries ligation of the left coronary artery in our rat model in order to obtain re sults closer to the clinical situation in which almost all patients with myocardial infarction are reperfused. The transient ischemia reperfusion protocol resulted in only moderate changes of systolic function after a long term recovery period.

LVP and dpdtmax were Inhibitors,Modulators,Libraries slightly reduced in the ischemia reperfusion group versus sham treated animals. Ramipril but not lixisenatide normalized LVP but not dpdtmax. Major differences were observed for the active treatments regarding diastolic function, in par ticular on left ventricular end diastolic pressure and the relaxation time tau Weiss. These functional im provements occur despite lack of effect on increased car diac fibrosis assessed by specific morphological staining and gene expression analysis. In addition, heart weight did not significantly differ between the various groups rul ing out strong effects on hypertrophy of cardiomyocytes as potential mode of action. Moreover, we noticed no effects on plasma glucose and insulin by lixisenatide treat ment in this non diabetic model.

Hence, indirect effects on heart metabolism via glucose uptake may not suffi ciently explain the observed improvement in cardiac function. A broader gene expression pattern of www.selleckchem.com/products/wortmannin.html genes involved in rat cardiac remodeling delivered two major findings. First, the myocardial infarction is a major driver of gene expression changes and drug effects in the non infarct regions of infarcted hearts are rather moderate. Second, lixisenatide and the ACE inhibitor ramipril are similar in their reaction pattern, indicating activation of more common protective signaling pathways for both treat ments.

Six microarray assays were analyzed using our method and the dist

Six microarray assays were analyzed using our method and the distance comparison method. Top ten hits were presented. As the table showed, no molecules were found by the distance comparison method to have a treatment on Alzheimer. In contrast, six of the top ten results detected by our method were negatively related to Dasatinib Alz heimer, promising possible therapeutic functions. Nordi hydroguaiaretic acid could break down pre formed Alzheimers b amyloid fibrils in vitro. Tretinoin was relevant to many pathophysiological fea tures of AD, including amyloid plaques, inflammation, immunological changes, cell death and regeneration pro cesses, altered neurotransmission, and age related changes. It made sense that Nordihydroguaiaretic acid and Tretinoin both had many negative correlation GO modules and could resist AD.

Estradiol and alpha estradiol also prevented AD associated Inhibitors,Modulators,Libraries inflammation with an increasing PPAR gamma expression. Mono rden, also known as radicicol, was a natural product binding to Hsp90 Inhibitors,Modulators,Libraries and altering Inhibitors,Modulators,Libraries its function, while Hsp90 acted as a regulator of patho genic changes that leaded to the neurodegenerative phenotype in AD. LY 294002 held back the traffick ing of APP and APP metabolites by inhibiting phospha tidylinositol 3 kinase. Among the remaining molecules, Prazosin was a non sedating generic medication used for hypertension and benign prostatic Inhibitors,Modulators,Libraries hypertrophy. It antagonizes NE effects at brain postsynaptic alpha 1 adreno receptors and new study said the prazosin improved patients behavioural symptoms such as agitationaggression in AD.

Ful vestrant Inhibitors,Modulators,Libraries was an interesting drug, known to block estro gen receptors. It could also dissociate HSP90 and trigger its intracellular degradation. Considering the positive connection between fulvestrant and Alzheimer, we could infer that estrogen pathway was more impor tant than HSP90 pathway in AD. The last molecule, ikarugamy cin, had no report of any relation with AD, but we thought it might also have a potential side effect to induce AD because of the positive correlated modules in our result. Because almost all molecules were related with AD in the result of our method, we thought that the transgenic AD model was a feasible model of AD in humans. Discussion Since the transgenic animal model of AD was feasible for drug discovery, we further performed an in depth analysis of the results of the AD case, especially for the three can didates fulvestrant, alpha estradiol and monorden.

Alpha estradiol, the predominant sex hormone pre sented in females, and monorden, a kind of HSP90 inhi bitor, were both negatively Ganetespib OSA connected with AD, while fulvestrant, both estrogen blocker and Hsp90 inhibitor, showed positive connection with AD. Researchers had found that the molecular chaperone Hsp90 interacted with unliganded steroid hormone receptors and regulated their activity.

ErbB1 chains contain intracellular tyrosines some of which be com

ErbB1 chains contain intracellular tyrosines some of which be come autophosphorylated by dimerization and serve as docking sites for adaptor selleck chemicals proteins that convey signals downstream thus promoting cell survival, angiogenesis, migration and tumor cell invasion. Additional phosphorylations of EGFR by other kinases stabilize and enhance receptor activity. The importance of EGFR kinase activity in lung cancer is illustrated by the approval of tyrosine kinase inhibitors as therapeutic agents. TKIs competitively bind and inhibit the catalytic kinase domain preventing EGFR from initi ating signal transduction. Targeting EGFR in lung cancer is particularly successful in patients with activation mutations in ErbB1, while other NSCLC patients either are partially responsive, have disease stabilization, or do not respond at all.

Approximately 15% of tumors in lung cancer patients exhibit EGFR activating muta tions and have significant responses to TKIs targeting EGFR. Resistant Inhibitors,Modulators,Libraries to EGFR inhibitors occurs and is associ ated with activation of additional signaling pathways, or secondary mutations in the ErbB1 gene that make EGFR less susceptible to inhibitors. Resistance and lack of responsiveness in the majority of metastatic lung cancer patients emphasize the importance of identifying additional targets for drug therapy. In some tumor cell lines, EGF Inhibitors,Modulators,Libraries receptors are activated by unknown mecha nisms, hence we reasoned that cell lines could be used to define additional proteins to target. Our approach was to delineate mechanisms of constitutive phosphoryl ation of EGFR in lung adenocarcinoma cell lines.

In preliminary studies constitutive phosphorylation of the EGFR at Y 845 and Y 992 in the Calu3 cell line was found independent of EGF stimulation. The objective of this study thus, was to determine the mechanisms lead ing to constitutive phosphorylation of EGFR. Once the mechanisms are defined, then inhibitors can be selected Inhibitors,Modulators,Libraries to Inhibitors,Modulators,Libraries counteract constitutive receptor activation. Materials and methods Cell lines tissue culture flasks, washed in PBS, then detached with Cell Dissociation Buffer. For inhibitor studies, Calu3 cells were seeded at 500,000 cells/well while H1975 cells were seeded at 750,000 cells/well and allowed to ad here overnight to achieve 80 90% confluency before serum starvation for 6 hours to overnight.

Cells were treated with various inhibitors or solvent vehicles Inhibitors,Modulators,Libraries in serum free medium as indicated. Diphtheria toxin mutant CRM197, and myristoylated PKC II peptide inhibitor I . erlotinib . U0126, and human recombinant EGF, . PP2, GM6001 and TAPI . and Enzastau rin. inhibitor Lenalidomide Erlotinib and LY317615 were obtained through Materials Transfer Agreements with OSI and Roche/ Genentech, and with Lilly Oncology, respectively. Calcein AM proliferation assay Cells were seeded at 15,000 cells per well into 96 well flat bottom plates.

As shown in Figure 7B

As shown in Figure 7B selleck screening library in H322 cells EGFR autophosphorylation was unaffected when cells were treated with gefitinib conditioned medium collected from Calu 3 in the absence of a NAP, in contrast when the inhibitor was present in the gefitinib conditioned medium, EGFR autophosphorylation was completely inhibited. These results strongly suggest that in sensitive cells the metabolites released into the medium were ineffective in EGFR inhibition. The high and constant drug level inside the cells obtained in the presence of a NAP maintained a signifi cant inhibition of EGFR p44/42 MAPK and AKT phos phorylation even after a prolonged period of treatment when compared with cells incu Inhibitors,Modulators,Libraries bated with gefitinib alone.

Sensitive cell lines were then treated with gefitinib in the presence of 10 uM a NAP for 72 h in order to evaluate the effects of CYP1A1 inhibition on efficacy of gefitinib in inhibiting cell proliferation. In the presence of the inhibitor the Inhibitors,Modulators,Libraries IC50 for gefitinib, evaluated by crystal violet staining and confirmed Inhibitors,Modulators,Libraries by cell counting and MTT assay, was reduced 15, 3 and 6 times in Calu 3, H322 and H292 cells respectively. Overall, these results show that inhibition of CYP1A1 is associated with reduced gefitinib metabolism, increased intracellular gefitinib content and increased drug efficacy in cultured NSCLC cells. Discussion The cytochrome P450 system consists of a large number of enzyme subfamilies involved in the oxidative metabo lism of xenobiotics including drugs. They are expressed mainly in the liver, but extra hepatic expression of a number of these enzymes does occur.

Although the primary site of gefitinib metabolism is the liver, tumor cell metabolism Inhibitors,Modulators,Libraries can significantly affect treatment effec tiveness. However, to our knowledge, no studies have been performed addressing gefitinib metabolism in lung tumor cells. The present Inhibitors,Modulators,Libraries study shows that the drop in gefitinib con tent observed in EGFR wild type gefitinib sensitive cell lines after 24 h of treatment was mainly due to gefitinib metabolism by CYP1A1 activity and not related to a time dependent modification of influx or efflux processes. Our results indicate that there is a significant difference between gefitinib sensitive and resistant cell lines with regard to drug metabolism. Surprisingly, only sensitive cells were able to metabolize gefitinib and as a conse quence, after 24 h of treatment, gefitinib disappeared both inside and outside the cells. till The majority of radiolabeled gefitinib metabolites were present in the extracellular compartment as not well defined metabolites since we could barely detect the M1 metabolite and M2 or M3 were undetectable.

Error bars repre sent the Standard Error of the Mean and each exp

Error bars repre sent the Standard Error of the Mean and each experiment has been completed at least twice www.selleckchem.com/products/CP-690550.html with samples in triplicate. Results Identification of differentially methylated genes in invasive sub populations of cells Individual promoter tiling arrays were performed to analyze global CpG promoter methylation for both non invasive and invasive cell isolates from both LNCaP and DU145. The cells were allowed to invade the Matrigel toward a highly defined media called stem cell media. It was then determined which genes were methylated in the non invasive cells and not in the invasive fraction of cells. This analysis determined that 869 probes were differentially methylated in the non invasive LNCaP fraction compared with the invasive and 1015 for DU145.

A very small subset of 44 overlapping genes was Inhibitors,Modulators,Libraries methylated in the non invasive cells and not in the inva sive population from both of the prostate cancer lines analyzed. These included genes involved in development such as Irx3, Six1 and Sox1, as well as a type III 5 deio dinase, and an embryonic version of myosin. Using the Oncomine database we investigated changes in expression patterns for these methylated targets, and we found a significant associa tion between progression of prostate cancer and metas tasis with expression of a number of genes including G protein, beta 1 subunit, retinoblastoma binding protein 8, secretogranin III and Sox1. Albeit Inhibitors,Modulators,Libraries a number of these proteins have been shown to play a role Inhibitors,Modulators,Libraries in cancer, we chose to investigate the role of Sox1 in our model since it is very homolo gous to the induced pluripotent stem cell regulator Sox2, and has been shown to play a role in progression of lung and nasopharyngeal cancer.

We also chose to investigate bone marrow tyrosine kinase gene in chromosome X protein since Inhibitors,Modulators,Libraries it has been shown to regulate hematopoiesis and play a role in the regulation of prostate cancer. However, from our Oncomine analysis Bmx was not shown to signifi cantly affect prostate cancer metastasis. Verification of methylation array data To verify the results from our methylation specific pro moter tiling arrays, we performed methylation specific PCR where primers were designed around the probe sequences identified from the arrays. Inhibitors,Modulators,Libraries Both Bmx and Sox1 were found to be methylated in the parental LNCaP and DU145 cell lines, representing the non invasive phenotype.

To deter mine if this pattern of methylation correlated with the level of gene expression, real time quantitative PCR was performed. Significant differences in the expression antagonist Bicalutamide of Bmx and Sox1 were seen when comparing the expression in non invasive and invasive cell popula tions in both LNCaP and DU145 cell lines. To further validate the results, immunocytochemistry was performed to analyze differences in protein expres sion between non invasive and invasive cells.

Leukem

selleck products Decreased pAkt and elevated I?Bwere detected when cells were transfected with siRNA toward either Akt or Aur A, compared with cells transfected with their scramble control respectively. Inhi bition of Aur A chemically also up regulated I?Blevel of PI3K with wortmannin Inhibitors,Modulators,Libraries did not prevent either an increase of pAkt and Bcl xL or a decrease in I?Bcaused by Aur A overexpression. Interestingly, in cells incubated with Akt inhibitor API 2 or siRNA against Akt, overexpression of Aur A however failed to reduce I?Bor raise Bcl xL expression in comparison to the vector control. This suggested that Akt, but not PI3K, was involved in the down regulation of I?Bby Aur A. These results revealed that Aur A, via its downstream target Akt, down regulated I?B, which then led to NFB nuclear translocation and subsequently activating NFB target gene Bcl xL in enhancing cancer cell survival.

Discussion Aur A kinase plays a critical role in tumorigenesis as an oncogenic protein. However, the exact pathway by which Aur A enhances Inhibitors,Modulators,Libraries cell survival has not been well defined. In Inhibitors,Modulators,Libraries this study, we showed that Aur A, via activating Akt path way, induced NFB nuclear translocation to promote cell survival. Indeed, overexpression of Aur A was positively associated with clinic stage and lymph node metastasis in TSCC patients. Moreover, we established a cross talk between mitotic Aurora kinase and IGF 1 induced PI3K Inhibitors,Modulators,Libraries survival pathway, interacting at Akt activation. Combined inhibition of both Aur A and PI3K led to a synergistic effect on inducing apoptosis and suppressing migration, reassuring an emerging theme of combination therapy in cancer treatment.

Aur A, a key regulator of mitosis, is essential for centro some function, spindle assembly, and mitotic entry. Inhibitors,Modulators,Libraries Dysregulation of Aur A has been linked to tumorigenesis. Previous studies have also shown that Aur A functions as apoptosis Akt attenuates Aur A inhibitory VX 680 induced. Conversely, overexpression of Aur A increased Akt activity and decreased I?Blevel compared with the vector control. We then analyzed the expression of Bcl xL, which is known as a NFB target gene closely associated with cell proliferation and apoptosis. Bcl xL was down regulated in Aur A and Akt depleted cells. Immunofluorescence staining of NFB p65 showed that Aur A overexpression was significantly associated with p65 nuclear translocation whereas p65 was mainly expressed in the cytoplasm in cells transfected with empty vector pCS2.

We further showed that inhibition a pro survival protein that counteract apoptosis and induce drug resistance in tumour cells. We and others demonstrated that Aur A promoted cell survival and migration by Akt activation, and Aur A activated NFB via I?Bphosphorylation. selleck chemicals Nintedanib Nevertheless, a clear pathway from Aur A activation to cell survival remains to be elucidated.

Data from our RT PCR experiments

Data from our RT PCR experiments Navitoclax 923564-51-6 Tofacitinib Citrate structure also showed selleck chemical Gefitinib that increases in RANTES mRNA in HER3 were detectable starting at 2 h after EGF treatment, corresponding to the gradually increasing RANTES concentration in both CM and cell lysates of this cell line. It should be noted that the CM levels Inhibitors,Modulators,Libraries of IL 1a, IL 18 and RANTES after 8 h of EGF treatment Inhibitors,Modulators,Libraries were signifi cantly lower than their peak levels at other sampling time points, making Inhibitors,Modulators,Libraries Inhibitors,Modulators,Libraries it difficult to determine the effect of MAPK and PI3K inhibitors on their secre tion at this time point. The only exception was the prominent RANTES concentration in HER2 cell lines.

In the experiment using MAPK and PI3K inhibitors, we Inhibitors,Modulators,Libraries did not observe a significant change in the RANTES concentration due to these inhibitors, suggesting that secretion of RANTES is independent of both MAPK/Erk and PI3K/Akt pathways.

Very similar secretion patterns of VEGF Inhibitors,Modulators,Libraries and PDGF were observed, in that both proteins continued to accu mulate throughout the 24 h experiment, with a slightly higher rate in HER2 and HER3 cell lines during the first 8 h. Our Inhibitors,Modulators,Libraries results show that secretion Inhibitors,Modulators,Libraries of VEGF is a fast and prominent response to EGF stimulation and that this process is mediated through both MAPK/Erk and PI3K/Akt pathways. A similar concentration pattern of VEGF was observed in the cell lysates, as VEGF concentration increased rapidly in the lysates upon EGF stimulation and peaked at 8 h, with a significantly higher level in HER2 cells.

On the other hand, secretion of PDGF does Inhibitors,Modulators,Libraries not seem to be a direct response to EGF stimulation, since PDGF concentration in CM at 8 h of EGF stimula tion was not significantly different from cells not stimu lated by EGF treatment.

These results further Inhibitors,Modulators,Libraries indicate that PDGF secretion, at least in this cell Inhibitors,Modulators,Libraries context, is not a Inhibitors,Modulators,Libraries MAPK/Erk and PI3K/Akt dependent process. Discussion In this study, we examined protein secretion Inhibitors,Modulators,Libraries patterns in HMEC upon HER1 receptor activation. This group of proteins not only includes HER receptors and ligands, but a variety of MMPs, cytokines and growth factors that regulate cellular behavior in both normal and pathological Inhibitors,Modulators,Libraries conditions.

All of these proteins have been associated with the development of a variety of epithelial cancers, including breast cancer.

and many of them have been investigated as potential cancer www.selleckchem.com/products/pacritinib-sb1518.html Inhibitors,Modulators,Libraries biomarkers. Our goal in this study was to better understand the underly ing mechanism that links HER receptor activation selleck products and biomarker secretion.

In particular, by examining three HMEC lines that express different levels of HER recep tors, we attempted to determine the influence of these receptors on the biomarker secretion and their regula tory mechanisms. Our results suggest that increased selleck catalog HER2 and HER3 expression potentiates ligand induced autocrine and paracrine signaling resulting from EGF activation of HER1.

Levels of the

Levels of the Carfilzomib HER receptors in these cell lines were quantified selleck screening library as described before. Results from this analysis showed that there are approximately 2×105 HER1, 3×104 HER2 and 2×103 HER3 receptors on each parental HER1 cell, 1. 5×105 HER1, 6×105 HER2 and 2×103 HER3 on each HER2 till cell, and 2×105 HER1, 3 104 HER2 and 2. 8 104 HER3 on each HER3 cell. It has been reported that the well characterized breast cancer cell line SK BR3 express about 2×105 HER1, 6×105 HER2 and 1×104 HER3 receptors. Inhibitors,Modulators,Libraries Based on these reports and another evaluation of HER receptor concen trations in breast cancer cells, our HER2 or HER3 cell lines express HER2 or HER3, respectively, Inhibitors,Modulators,Libraries at levels that Inhibitors,Modulators,Libraries are comparable to those found in breast cancer cells that overexpress these receptors.

Cell Culture and Treatment Only cells that were less Inhibitors,Modulators,Libraries than fifteen passages from the original frozen stock were used in this study. Each cell line was seeded Inhibitors,Modulators,Libraries at 3. 0×105 cells per well of 6 well plates in DFCI 1 culture medium, and were allowed to grow to Inhibitors,Modulators,Libraries confluence prior to treatment. Before EGF treatment, cultured cells were fasted for 14 18 h in serum free, DFCI 1 medium that lacked all supplements except 0. 1% bovine serum albu min. Cells were then washed twice with buffered saline, pH 7. 2 7. 4, followed by the addition of 1 ml fresh serum free medium with Inhibitors,Modulators,Libraries 12 ng/ml EGF added. Acti vated cells were incubated at 37 C for up to 24 h and samples were collected at fixed time points after EGF addition.

Immediately Inhibitors,Modulators,Libraries prior to harvesting, cells were Inhibitors,Modulators,Libraries chilled by placing the culture dishes on ice.

Sample Collection and Processing Conditioned medium from the cultured cells was transferred to Inhibitors,Modulators,Libraries microcentrifuge Inhibitors,Modulators,Libraries tubes, and centrifuged at 2000 g for 5 min at 4 C in order to remove Inhibitors,Modulators,Libraries any particu lates or cell debris. An aliquot of each supernatant was then transferred to another tube that contained a 1/10th volume of 1% casein and green fluorescent protein in PBS, such that the final con centration of the green fluorescent protein was 100 pg/ ml. Green fluorescent protein was used as the antigen in an internal calibrant assay based on a sandwich ELISA.

The fluorescent signal from the capture antibody Inhibitors,Modulators,Libraries in this assay selleck kinase inhibitor was used for data normalization using a custom bioinformatics program, ProMAT Calibrator, as described Inhibitors,Modulators,Libraries below.

The cells on these culture plates were then washed twice with cold PBS, and harvested by add ing 200��l of lysis buffer.

Cell lysates were collected and centrifuged at 18,500 g for 10 min. The protein concentration Inhibitors,Modulators,Libraries Sunitinib purchase of cell lysates was measured using the Bicinchoninic Acid protein quantitation kit and averaged 1. 6 0. selleck bio 3 mg/ml. Since 200��l of lysis buffer was added, we estimate that about 0. 32 mg of protein was collected from each plate. In certain experiments, cultured cells were pre incu bated with a single inhibitor for 1 h prior to EGF addition.

We have previously utilized the myeloma cell line RPMI 8226 and i

We have previously utilized the myeloma cell line RPMI 8226 and its multidrug resistant 8226/Dox40 selleckchem Cisplatin subline for phenotype selective activity in response to an annotated compound library. The 8226/Dox40 subline over expresses P glycoprotein, but also other mechanisms are likely contributing to the multidrug resistant phenotype. We have also previously demon strated that over expression of STAT1 regulated genes con tribute to doxorubicin resistance observed in 8226/Dox40 cells. In the present study the same myeloma cell lines were tested in response to 3,000 chemically diverse compounds to explore the possibility of finding compounds selectively active against the MDR phenotype. After hit validation and counter screening one hit compound, VLX40, was selected for mechanistic investigation and further preclinical evaluation.

Methods Cell culture For primary screening RPMI 8226 and its multidrug resistant cell line 8226/Dox40 were used. In a secondary screen, a cell line panel representing different drug resist ance phenotypes was used. The cell lines of this panel were cultured and harvested Inhibitors,Modulators,Libraries as previously described. An additional 98 primary Inhibitors,Modulators,Libraries cultures of primary human tumor cells from different tumor types, and four preparations of normal peripheral blood mononuclear cells, detailed in Table 2, were used to determine the activity spectrum of VLX40 and, for comparison, six standard cytotoxic drugs chosen to represent different Inhibitors,Modulators,Libraries mechanistic classes. The tumor samples were obtained by bone marrow/peripheral blood sampling, routine surgery or diagnostic biopsy.

Leukemic cells and PBMCs were isolated by 1. 077 g/ml Ficoll Paque centrifugation. Tumor tissue from solid tumor samples was minced into Inhibitors,Modulators,Libraries small pieces and tumor cells were isolated by collagenase dispersion followed by Percoll density gradient centrifuga tion. The patient sampling was approved by the Regional Ethics Board, Uppsala, Sweden. Cell viability was determined by trypan blue exclusion test and the proportion of tumor cells in the preparation was judged by inspection of May Grunwald Giemsa stained cytospin slides. All samples used in this study contained more than 70% tumor cells. The human cell lines used for mechanistic studies were MCF7, HCT 116 and hTERT RPE 1. MCF7, HCT 116 and HL 60 were obtained Inhibitors,Modulators,Libraries from American Type Culture Collection whereas hTERT RPE 1 was from Clontech.

sellekchem In the in vivo hollow fiber studies the myelocytic cell line U 937 was used. The normal epithelial hTERT RPE 1 cells were cultured in Dulbeccos Modified Eagles Medium nutrient mixture F 12 Ham, supplemented with 10% heat inactivated fetal calf serum, 2 mM glutamine, 100 ug/ml streptomycin and 100 U/ml penicillin at 37 C in humidified air containing 5% CO2. MCF 7 was grown in in Eagles Minimal Essential Medium, supplemented as above. HCT116 were grown in complete McCoys medium.