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BioAssay: AID 449762

High Throughput Screening Assay used to Identify Novel Compounds that Inhibit Mycobacterium Tuberculosis in 7H9 Media

Mycobacterium tuberculosis (Mtb) is a notorious pathogen whose increasing resistance to antibiotics and heightened lethality in combination with AIDS makes it a major health concern worldwide. The World Health Organization (WHO) estimates that one-third of the world's population is infected with Mtb; eight million people worldwide develop tuberculosis annually while nearly two million die. Mtb more ..
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 Tested Compounds
 Tested Compounds
All(327561)
 
 
Active(1938)
 
 
Inactive(312900)
 
 
Inconclusive(12728)
 
 
 Tested Substances
 Tested Substances
All(327669)
 
 
Active(1938)
 
 
Inactive(312998)
 
 
Inconclusive(12733)
 
 
 Related BioAssays
 Related BioAssays
AID: 449762
Data Source: Southern Research Specialized Biocontainment Screening Center (TB_Inh_SD_DR)
BioAssay Type: Confirmatory, Concentration-Response Relationship Observed
Depositor Category: NIH Molecular Libraries Probe Production Network
BioAssay Version:
Deposit Date: 2010-07-22
Modify Date: 2010-07-23

Data Table ( Complete ):           View Active Data    View All Data
BioActive Compounds: 1938
Related Experiments
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AIDNameTypeComment
449775Summary of Assays used to Identify Novel Compounds That Inhibit Mycobacterium Tuberculosis in 7H9 Media with GlycerolSummarydepositor-specified cross reference
493198High Throughput Screening Assay used to Identify Novel Compounds that Inhibit Mycobacterium Tuberculosis in 7H9 Media using Purified and Synthesized CompoundsConfirmatorydepositor-specified cross reference
504556High Throughput Screening Assay used to Identify Novel Compounds that Inhibit Mycobacterium Tuberculosis in 7H9 Media using Purified and Synthesized Compounds (2)Confirmatorydepositor-specified cross reference
504640A Cell Based Secondary Assay to Explore Cytotoxicity in THP-1 Cells of Compounds that Modulate Mycobacterium tuberculosis in Media Containing Glycerol versus Media without GlycerolConfirmatorydepositor-specified cross reference
504642A Cell Based Secondary Assay to Explore Cytotoxicity in HepG2 Cells of Compounds that Modulate Mycobacterium tuberculosis in Media Containing Glycerol versus Media without GlycerolConfirmatorydepositor-specified cross reference
504646High Throughput Screening Assay used to Identify Novel Compounds that Inhibit Mycobacterium Tuberculosis in 7H9 Media using Purified and Synthesized Compounds (3)Confirmatorydepositor-specified cross reference
504682A Cell Based Secondary Assay to Explore Cytotoxicity in HepG2 Cells of Compounds that Modulate Mycobacterium tuberculosis in Media Containing Glycerol versus Media without Glycerol (2)Confirmatorydepositor-specified cross reference
504683A Cell Based Secondary Assay to Explore Cytotoxicity in THP-1 Cells of Compounds that Modulate Mycobacterium tuberculosis in Media Containing Glycerol versus Media without Glycerol (2)Confirmatorydepositor-specified cross reference
504852A Cell Based Secondary Assay to Explore Cytotoxicity in THP-1 Cells of Compounds that Modulate Mycobacterium tuberculosis in Media Containing Glycerol versus Media without Glycerol (3)Confirmatorydepositor-specified cross reference
504853A Cell Based Secondary Assay to Explore Cytotoxicity in HepG2 Cells of Compounds that Modulate Mycobacterium tuberculosis in Media Containing Glycerol versus Media without Glycerol (3)Confirmatorydepositor-specified cross reference
504857High Throughput Screening Assay used to Identify Novel Compounds that Inhibit Mycobacterium Tuberculosis in 7H9 Media using Purified and Synthesized Compounds (4)Confirmatorydepositor-specified cross reference
504897High Throughput Screening Assay used to Identify Novel Compounds that Inhibit Mycobacterium Tuberculosis in 7H9 Media using Purified and Synthesized Compounds (6)Confirmatorydepositor-specified cross reference
504898A High Throughput Confirmatory Assay used to Identify Novel Compounds that Inhibit Mycobacterium Tuberculosis in the absence of Glycerol using Purified and Synthesized Compounds (5)Confirmatorydepositor-specified cross reference
504901A High Throughput Confirmatory Assay used to Identify Novel Compounds that Inhibit Mycobacterium Tuberculosis in the absence of Glycerol using Purified and Synthesized Compounds (6)Confirmatorydepositor-specified cross reference
504903High Throughput Screening Assay used to Identify Novel Compounds that Inhibit Mycobacterium Tuberculosis in 7H9 Media using Purified and Synthesized Compounds (5)Confirmatorydepositor-specified cross reference
504909A Cell Based Secondary Assay To Explore Vero Cell Cytotoxicity of Purified and Synthesized Compounds that Inhibit Mycobacterium Tuberculosis (5)Confirmatorydepositor-specified cross reference
504910A Cell Based Secondary Assay to Explore Cytotoxicity in HepG2 Cells of Compounds that Modulate Mycobacterium tuberculosis in Media Containing Glycerol versus Media without Glycerol (4)Confirmatorydepositor-specified cross reference
504911A Cell Based Secondary Assay to Explore Cytotoxicity in THP-1 Cells of Compounds that Modulate Mycobacterium tuberculosis in Media Containing Glycerol versus Media without Glycerol (4)Confirmatorydepositor-specified cross reference
588437A High Throughput Confirmatory Assay used to Identify Novel Compounds that Inhibit Mycobacterium Tuberculosis in the absence of Glycerol using Purified and Synthesized Compounds (7)Confirmatorydepositor-specified cross reference
588441A Cell Based Secondary Assay to Explore Cytotoxicity in HepG2 Cells of Compounds that Modulate Mycobacterium tuberculosis in Media Containing Glycerol versus Media without Glycerol (5)Confirmatorydepositor-specified cross reference
588443A Cell Based Secondary Assay to Explore Cytotoxicity in THP-1 Cells of Compounds that Modulate Mycobacterium tuberculosis in Media Containing Glycerol versus Media without Glycerol (5)Confirmatorydepositor-specified cross reference
588445A Cell Based Secondary Assay To Explore Vero Cell Cytotoxicity of Purified and Synthesized Compounds that Inhibit Mycobacterium Tuberculosis (6)Confirmatorydepositor-specified cross reference
588447High Throughput Screening Assay used to Identify Novel Compounds that Inhibit Mycobacterium Tuberculosis in 7H9 Media using Purified and Synthesized Compounds (8)Confirmatorydepositor-specified cross reference
602431A Cell Based Secondary Assay To Explore Vero Cell Cytotoxicity of Purified and Synthesized Compounds that Inhibit Mycobacterium Tuberculosis (8)Confirmatorydepositor-specified cross reference
602432A Cell Based Secondary Assay to Explore Cytotoxicity in HepG2 Cells of Compounds that Modulate Mycobacterium tuberculosis in Media Containing Glycerol versus Media without Glycerol (6)Confirmatorydepositor-specified cross reference
602433A Cell Based Secondary Assay to Explore Cytotoxicity in THP-1 Cells of Compounds that Modulate Mycobacterium tuberculosis in Media Containing Glycerol versus Media without Glycerol (6)Confirmatorydepositor-specified cross reference
602435High Throughput Screening Assay used to Identify Novel Compounds that Inhibit Mycobacterium Tuberculosis in 7H9 Media using Purified and Synthesized Compounds (9)Confirmatorydepositor-specified cross reference
602437A High Throughput Confirmatory Assay used to Identify Novel Compounds that Inhibit Mycobacterium Tuberculosis in the absence of Glycerol using Purified and Synthesized Compounds (8)Confirmatorydepositor-specified cross reference
435019A Cell Based Secondary Assay To Explore Cytotoxicity of Compounds that Inhibit Mycobacterium TuberculosisConfirmatorysame project related to Summary assay
449764A High Throughput Confirmatory Assay used to Identify Novel Compounds that Inhibit Mycobacterium Tuberculosis in the absence of GlycerolConfirmatorysame project related to Summary assay
493181A High Throughput Confirmatory Assay used to Identify Novel Compounds that Inhibit Mycobacterium Tuberculosis in the absence of Glycerol using Purified and Synthesized CompoundsConfirmatorysame project related to Summary assay
504335A Cell Based Secondary Assay To Explore Cytotoxicity of Purified and Synthesized Compounds that Inhibit Mycobacterium Tuberculosis.Confirmatorysame project related to Summary assay
504562A Cell Based Secondary Assay To Explore Cytotoxicity of Purified and Synthesized Compounds that Inhibit Mycobacterium Tuberculosis (2)Confirmatorysame project related to Summary assay
504564A High Throughput Confirmatory Assay used to Identify Novel Compounds that Inhibit Mycobacterium Tuberculosis in the absence of Glycerol using Purified and Synthesized Compounds (2)Confirmatorysame project related to Summary assay
504645A High Throughput Confirmatory Assay used to Identify Novel Compounds that Inhibit Mycobacterium Tuberculosis in the absence of Glycerol using Purified and Synthesized Compounds (3)Confirmatorysame project related to Summary assay
504684A Cell Based Secondary Assay To Explore Vero Cell Cytotoxicity of Purified and Synthesized Compounds that Inhibit Mycobacterium Tuberculosis (3)Confirmatorysame project related to Summary assay
504854A Cell Based Secondary Assay To Explore Vero Cell Cytotoxicity of Purified and Synthesized Compounds that Inhibit Mycobacterium Tuberculosis (4)Confirmatorysame project related to Summary assay
504860A High Throughput Confirmatory Assay used to Identify Novel Compounds that Inhibit Mycobacterium Tuberculosis in the absence of Glycerol using Purified and Synthesized Compounds (4)Confirmatorysame project related to Summary assay
Description:
Southern Research's Specialized Biocontainment Screening Center (SRSBSC)
Southern Research Institute (Birmingham, Alabama)
NIH Molecular Libraries Probe Production Centers Network (MLPCN)
Assay Provider: Dr. William Bishai, Johns Hopkins University Tuberculosis Research Center
Award: 1 R03 MH084877-01A1

Mycobacterium tuberculosis (Mtb) is a notorious pathogen whose increasing resistance to antibiotics and heightened lethality in combination with AIDS makes it a major health concern worldwide. The World Health Organization (WHO) estimates that one-third of the world's population is infected with Mtb; eight million people worldwide develop tuberculosis annually while nearly two million die. Mtb causes more deaths than any other infectious agent in the world. Immunocompromised individuals, particularly those infected with human immunodeficiency virus (HIV), are at great risk for infection with Mtb. WHO estimates that 11.4 million people worldwide are infected with both Mtb and HIV. Although infections with drug sensitive strains can be effectively cured with a 6 to 9 month regimen of multiple antibiotics, the inability to deliver and complete appropriate courses of therapy on a global level has led to the selection of resistant strains over the past 50 years. Especially alarming is the upsurge in cases of multidrug-resistant tuberculosis (MDR-TB). The selection and spread of multiple drug resistant Mtb continued for decades leading to selection and spread of two operationally distinct forms, multiple drug resistant (MDR-TB resistant to isoniazid and rifampicin) and extensively drug resistant (XDR-TB resistant to isoniazid, rifampicin, a fluoroquinolone and at least one of the injectable second-line agents). The estimate for global MDR-TB and XDR-TB cases for 2005 were 424,000 and 27,000 respectively, and the situation is worst in areas with high incidences of HIV infection. XDR-TB has been found in 41 countries.

Thus the discovery of new types of anti-TB drugs acting on novel drug targets with no cross-resistance to any existing drugs is urgently needed. Modern high-throughput screening systems provide an immensely powerful strategy to identify new lead compounds in a relatively short amount of time. In this study we have adapted the microdilution Alamar blue assay (PMID: 9145860, Collins and Franzblau 1997) to a 384-well plate format and used it to screen a compound library in a BSL-3 contained high throughput platform for antimicrobial activity. A total of 327,669 compounds were screened initially in a single dose of 25 uM and a final DMSO concentration of 1%. 14,995 compounds inhibiting Mtb by 70.31% (3 standard deviations greater than the mean of the compound population) were classified as active in the primary screen yielding a high hit rate. When making selections for follow-up, previously pursued compounds and analogs of know inhibitors were excluded (Ananthan, 2009, PMID: 19758845; Maddry, 2009, PMID: 19783214). Pipeline Pilot's "Diverse Molecule" component was used to select 2500 diverse substances from the remaining set. Of those 2,262 were available for continuation in the screening process. Compounds were screened in a dose-response assay using a stacked-plate method at concentrations ranging from 100uM to 0.19uM.
Protocol
Frozen stocks were prepared from Mtb H37Rv (ATCC 27294) obtained from the American Type Culture Collection (Manassas, VA). The Mtb HTS assay was modified from that described by (PMID: 9145860, Collins and Franzblau 1997) using black, clear-bottom, 384-well microtiter plates and 7H9 broth. Compounds stocks of 1 mg/mL in 100% DMSO were diluted in assay media and 25 ul of these diluted compounds were transferred to 384-well plates. Amikacin was included in the positive control wells in every assay plate at 2.5 ug/mL. The high concentration of amikacin completely inhibits growth and is used in lieu of uninoculated medium (background) to calculate percent inhibition by the test compounds for each plate. Plates containing test compounds (320 compounds/plate) and positive control compounds were transferred into our BSL3 facility for bacteria addition and incubation. The bacterial stock was diluted to 2-4x10^4 CFU/ml in the assay medium, Middlebrook 7H9 broth with glycerol and tween 80 and the cultures were pre-grown for 72h with agitation at 37 C before plating at an OD615 of 0.001. After dilution, 25 uL was plated over the compounds. Positive and negative control wells were included in each plate. Plates were placed in stacks of two inside actively humidified incubators and incubated for 7 days at 37C with >= 95% humidity. After 7 days of incubation, end point reagent (2 parts Alamar blue (Trek diagnostics no. 00-100) + 1.5 parts 18.2% Tween 80 (Difco no. 231181) diluted in milli Q water) was added to all wells in a volume of 9 ul per well. The plates were returned to the incubator for an additional 18-20 hours. The plates were sealed and bottom read for fluorescence using a Perkin Elmer Envision plate reader at 535 nm excitation and 590 nm emission.
Comment
Possible artifacts in the Mtb assay include, but are not limited to, compounds that auto fluoresce (false negatives) and compounds that absorb in the 500-600 nm range (false positives), or precipitate. Possible artifacts in the Vero Cytotoxicity assay include, but are not limited to, compounds that that interfere with the luciferase reaction, absorb at 700nm (the wavelength of light emitted by the luciferase reaction), or precipitate.
Outcome: Compounds that showed >30% inhibition for at least one concentration in the Mtb dose response were defined as "Active". If the inhibition at all doses was <30% in the Mtb assay, the compound was defined as "Inactive". In the primary screen a compound was deemed "Inactive" if it had a Percent Inhibition <70.31%. Compounds with a Percent Inhibition >=70.31% but were not selected for follow up dose response were labeled "Inconclusive."
The following tiered system has been implemented at Southern Research Institute for use with the PubChem Score. Compounds in the primary screen are scored on a scale of 0-40 based on inhibitory activity where a score of 40 corresponds to 100% inhibition. In the confirmatory dose response screen, active compounds were scored on a scale of 41-80 based on the IC50 result in the Mtb assay while compounds that did not confirm as actives were given the score 0.
Categorized Comment - additional comments and annotations
From ChEMBL:
Assay Type: Functional
Result Definitions
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TIDNameDescriptionHistogramTypeUnit
OutcomeThe BioAssay activity outcomeOutcome
ScoreThe BioAssay activity ranking scoreInteger
1Confirmatory SummaryString
2IC90 ModifierString
3IC90FloatμM
4IC50 ModifierString
5IC50*FloatμM
6IC50 Std Dev ModifierString
7IC50 Std DevFloat
8IC50 Hill SlopeFloat
9IC50 Normalized Chi2Float
10Percent Inhibition @ 100 uM (100μM**)Float%
11Percent Inhibition @ 50 uM (50μM**)Float%
12Percent Inhibition @ 25 uM (25μM**)Float%
13Percent Inhibition @ 12.5 uM (12.5μM**)Float%
14Percent Inhibition @ 6.25 uM (6.25μM**)Float%
15Percent Inhibition @ 3.13 uM (3.13μM**)Float%
16Percent Inhibition @ 1.56 uM (1.56μM**)Float%
17Percent Inhibition @ 0.78 uM (0.78μM**)Float%
18Percent Inhibition @ 0.39 uM (0.39μM**)Float%
19Percent Inhibition @ 0.20 uM (0.2μM**)Float%
20Maximum InhibitionMaximum Inhibition observed across all concentrationsFloat%
21Concentration of Maximum InhibitionConcentration at which Maximum Inhibition was observedFloatμM
22Primary Screen OutcomeString
23Primary Screen Percent Inhibition @ 25 uM Rep 1Float%
24Primary Screen Percent Inhibition @ 25 uM Rep 2Float%
25VerificationString

* Activity Concentration. ** Test Concentration.
Additional Information
Grant Number: 1 R03 MH084877-01A1

Data Table (Concise)
Data Table ( Complete ):     View Active Data    View All Data
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