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146 protocols using atplite

1

Quantifying metabolic activity and proliferation of 2D and 3D cancer cell cultures

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Metabolic activity of 2D and 3D MDA-MB-231 cell cultures was assessed with CellTiter-Glo® cell viability reagent (Promega, #G7570) according to the manufacturer's instructions without any modification: the diluted CellTiter Glo substrate was added to the culture wells at the end of the treatment period, followed by a 10 min incubation, and luminescence quantification on a FLUOstar Optima (BMG labtech).
The Adenosine TriPhosphate (ATP)-monitoring luminescence assay ATPLite TM (PerkinElmer, #6016943) was used to quantitatively assess proliferation and cytotoxicity of 3D MCF-7 cultures. The ATPLite TM assay followed standard recommended no wash one step protocol and was read on an EnSight TM Multimode Plate Reader (PerkinElmer), without any deviation from the manufacturers protocol: 50 μL cell lysis solution was added to the 3D cell cultures and incubated for 5 minutes on an orbital shaker, followed by the addition of 50 μL ATPLite substrate solution and a further 5-minute shaking. The culture plates were then incubated for 10 minutes in the dark, before the quantification of their luminescence intensity.
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2

Measuring ATP Secretion in Enteric Glial Cells

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Luciferin-luciferase assay was used to monitor basal secretion of ATP according to the manufacturer’s instructions (ATP-lite, Perkin Elmer) using 100μl of the supernatant.
EGCs were grown in 12-well dishes (2×104 cells in each well) in DMEM supplemented with 10% FBS and 1% penicillin-streptomycin until confluence was reached (7–10 days). Cell cultures were grown individually from 4 different surgical specimens and were used at passages 4–7. EGCs isolation was performed from MP of 3 surgical patients (2 jejunum, 1 colon) and SMP of one patient (colon). Preliminary analysis did not reveal any differences in amount of ATP secretion in each surgical specimen and therefore, data in different surgical specimens were pooled together. To study the effect of treatment on ATP secretion, cells were incubated with LPS+IFNγ in 400μl of DMEM with 10% FBS and 1% penicillin-streptomycin. For controls the medium alone was used. Supernatants (300μl) were collected and immediately frozen in liquid nitrogen for measurement of ATP (ATPlite, Perkin Elmer).
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Evaluating Safety of Ophthalmic Compounds

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Adult retinal pigment epithelial cells (ARPE-19; American Type Culture Collection, Manassas, VA) were cultured at 37°C (humidified atmosphere with 5% CO2) in Dulbecco's Modified Eagle Medium/Nutrient Mixture F-12 (DMEM:F12) medium (30-2006; American Type Culture Collection) and 100 U/mL penicillin, 100 μg/mL streptomycin, and 10% fetal bovine serum. The study was divided into two phases:

Phase I—Evaluation of the safety profiles of single-compound (LB-VD and TA) formulations on ARPE-19 cells with the following endpoints: cell morphology evaluation by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay (Chemicon International, Temecula, CA), lactate dehydrogenase (LDH) release assay, and ATPlite (PerkinElmer, Waltham, MA) after 1, 5, and 30 minutes of treatment with formulations

Phase II—Evaluation of the safety profiles of the same formulations in combination with ultrapure PFD, with the following endpoints: MTT and ATPlite after 1 and 5 minutes of treatment with the formulations and 24 hours of treatment with PFD. We also attempted to evaluate the LDH release; however, we were not able to detect LDH, probably due to a strong interference with PFD in the medium.

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4

Melanoma Cell Growth Inhibition Assay

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Cell growth was assayed using ATPlite (Perkin Elmer). Briefly, melanoma cells (5,000 cells/well) were cultured in 96-well plates with a transparent bottom. Twenty-four hours after seeding, inhibitors were added for 72 or 120 hr. Cell growth or viability was measured using ATPlite (Perkin Elmer) and quantified by monitoring luminescence intensity.
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5

Melanoma Cell Growth Inhibition Assay

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Cell growth was assayed using ATPlite (Perkin Elmer). Briefly, melanoma cells (5,000 cells/well) were cultured in 96-well plates with a transparent bottom. Twenty-four hours after seeding, inhibitors were added for 72 or 120 hr. Cell growth or viability was measured using ATPlite (Perkin Elmer) and quantified by monitoring luminescence intensity.
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6

Intracellular ATP Quantification Assay

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Intracellular ATP levels were determined using ATPliteTM (PerkinElmer, Waltham, MA, USA) according to the manufacturer’s recommended procedure. Cells were seeded into black, clear-bottom 96-well plates (Corning, Corning, NY, USA) at a density of 1000 cells/well and incubated for 24 h. Cells were treated with test compounds for 6 h and then lysed with lysis buffer. Lysates were incubated with the ATPlite substrate, and luminescence was then measured on a SpectraMax M5 multimode microplate reader (Molecular Devices, San Jose, CA, USA).
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7

Assessing Cellular ATP Levels

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ATP levels were measured by using the commercial available kit ATPliteTM (Perkin Elmer).
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8

Intracellular ATP Measurement in LV Myocytes

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Intracellular ATP level of LV myocytes was measured using Luminescence Assay system (ATPliteTM, Perkin Elmer, Waltham, MA). Prepared cells were snap-frozen in liquid nitrogen, followed by lysis with 1× mammalian cell lysis solution. Protein concentration was determined using Bradford protocol. Then 150 μl of cell lysate and 50 μl substrate solution were added to the wells, and the microplate was shaken for 5 min in an orbital shaker at 700 rpm. The plate was placed in the dark for 10 min prior to luminescence measurement. Luminescence of the mixture was measured using a microplate plate reader (Tecan Microplate Reader: Multi-Mode Infinite M200, San Jose, CA).
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9

Quantifying Intracellular ATP Levels

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The intracellular pool of ATP was determined by using the luminescence ATP detection assay ATPliteTM (PerKinElmer). This assay measures light emission caused by the enzymatic reaction between ATP and luciferin-luciferase. Medium without cells was used to determine the assay background signal for each medium. Three technical replicates of 100 μL culture were taken from each culture flask sample prior to quenching cells in cold methanol/water. The cells were lysed and the total ATP content was quantified according to the manufacturer’s instructions using ATP standard curves obtained from medium spiked with ATP standard solutions (one calibration curve for each medium). Light emission was measured using a bioluminescence plate reader (EnvisonTM, PerkinElmer).
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10

ATP Quantification in Cells

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The level of ATP in cells was determined by the ATPliteTM luminescent analysis system (Perkin Elmer Inc., MA, USA). ATP level in the PBS group was defined as 100% and the relative ATP level in the experimental group was calculated. The relative ATP level (%) = (fluorescence intensity of the experimental group/fluorescence intensity of the PBS group) × 100%.
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