Name: an in vitro caseum binding assay that predicts drug penetration in tuberculosis lesions
Uploaded: 2017-05-08T15:00:00
Description: Watch this Scientific Journal Video about An In Vitro Caseum Binding Assay that Predicts Drug Penetration in Tuberculosis Lesions at JoVE.com

We wish to thank Johnson &amp; Johnson, the TB Alliance, Astra Zeneca, Rib-X and Trius Therapeutics for providing bedaquiline, PA-824 (pretomanid), AZD5847, radezolid and tedizolid, respectively. Brendan Prideaux, Matthew Zimmerman, Stephen Juzwin, Emma Rey-Jurado, Nancy Ruel, Leyan Li and Danielle Weiner provided support with MALDI analysis, bioanalytical methods, preparation of the caseum surrogate, chemical synthesis, and isolation of rabbit caseum. This work was conducted with funding from the Bill and Melinda Gates Foundation, award # OPP1044966 and OPP1024050 to V. Dartois, NIH Shared Instrumentation Grant S10OD018072, as well as joint funding from the Bill and Melinda Gates Foundation and Wellcome Trust for A Centre of Excellence for Lead Optimization for Diseases of the Developing World to P. Wyatt.

All animal studies were carried out in accordance with the Guide for the Care and Use of Laboratory Animals of the National Institutes of Health with approval from the Institutional Animal Care and Use Committee of the NIAID (NIH), Bethesda, MD. All studies involving M. tuberculosis were performed in a laboratory with biosafety containment level 3 (BSL-3).
1. Rabbit Infection Model and Caseum Collection
<ol>
	<li>Infect New Zealand white rabbits with M. tuberculosis using a...

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P., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Prediction+of+Drug+Penetration+in+Tuberculosis+Lesions.">Prediction of Drug Penetration in Tuberculosis Lesions.</a> ACS Infect Dis. 2 (8), 552-563 (2016).</li><li>Waters, N. J., Jones, R., Williams, G., Sohal, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Validation+of+a+rapid+equilibrium+dialysis+approach+for+the+measurement+of+plasma+protein+binding.">Validation of a rapid equilibrium dialysis approach for the measurement of plasma protein binding.</a> J Pharm Sci. 97 (10), 4586-4595 (2008).</li><li>Singh, J. K., Solanki, A., Maniyar, R. C., Banerjee, D., Shirsath, V. 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Pulmonary necrotic lesions and cavities in tuberculosis-infected patients contain subpopulations of bacteria that are recalcitrant to drug treatment. The caseous cores of these structures are particularly responsible for harboring these persisters in an extracellular environment.16 Favorable distribution of anti-bacterial agents into these remote locations is believed to be an important determinant of tuberculosis drug efficacy. Prior to the validation of this protocol, there were no available <em...

The treatment of pulmonary tuberculosis disease requires effective distribution of drugs into different types of lesions. Necrotic lesions and cavities contain caseous centers that harbor subpopulations of drug-tolerant or &#39;persistent&#39; bacteria.1,2 The cavitary disease is associated with inferior cure rates and poor prognosis.3,4 Previous studies have shown, using quantitative and imaging techniques, that the ability to penetrate caseum varies significantly from one drug class to another.5,6 These methods, however, require the use of animal infection models that are slow and tedious. An in vitro assay that measures drug binding to ex vivo caseum was designed. This binding was found to inversely correlate with drug penetration in caseous granulomas and, hence, is used as a predictive tool.7
Equilibrium dialysis is regarded as the gold standard approach to plasma protein binding studies. The rapid equilibrium dialysis (RED) device provides a quick, easy-to-use and reliable system for performing such assays.8 The device is made up of two components: single-use, disposable inserts consisting of 2 chambers separated by a vertical cylinder of semi-permeable membrane; and reusable base plates that can hold up to 48 inserts at a time. The dialysis membrane has an 8 kDa molecular weight cut-off (MWCO) that is ideal for drug-macromolecule binding studies. The high surface area-to-volume ratio of the membrane compartment allows rapid dialysis and equilibration. Both the inserts and the base plate have been validated for minimal non-specific binding. The combination of the RED device with bioanalytical techniques provides accurate estimations of the unbound fractions of drugs in plasma.8,9
Although originally designed to measure plasma protein binding, the RED device has been used in several tissue binding studies using homogenates.10,11 In this protocol, we measure drug binding to caseum, the necrotic debris excised from the necrotic lesions and cavities of tuberculosis-infected rabbits. The acellular and non-vascular nature of caseous material makes it easy to homogenize into a homogenous suspension that is compatible with the assay.
Given that caseum is tedious to produce and hard to come by, the protocol has also been validated for use with a surrogate matrix that is prepared from foamy macrophages. THP-1 monocyte-derived macrophages are induced with oleic acid to accumulate multiple lipid bodies that give them their &#39;foamy&#39; appearance. These lipid-loaded cells are harvested and processed to produce a matrix that we use as a surrogate to caseum. This study has shown that drug binding to this surrogate matrix correlates well with binding to caseum, effectively mimicking the in vivo process that hinders drug penetration in the caseous core of granulomas and cavities.

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			<td height="20" style="height:20px;width:443px;">New Zealand White Rabbits</td>
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			<td height="20" style="height:20px;width:443px;">HN878 Mycobacterium tuberculosis</td>
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			<td height="20" style="height:20px;width:443px;">Ketathesia (Ketamine) 100mg/mL C3N</td>
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			<td style="width:147px;">33198</td>
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			<td height="20" style="height:20px;width:443px;">Euthasol (pentobarbital sodium and phenytoin sodium) Solution&#160;</td>
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			<td style="width:147px;">710101</td>
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			<td height="20" style="height:20px;width:443px;">THP-1 monocytic cell line</td>
			<td style="width:203px;">ATCC</td>
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			<td height="20" style="height:20px;">175cm&#178; TC-Treated Flask (T175)</td>
			<td style="width:203px;">Fisher Scientific</td>
			<td>T-3400-175</td>
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			<td height="20" style="height:20px;">RPMI 1640 media w/o glutamine</td>
			<td style="width:203px;">Fisher Scientific</td>
			<td>MT-15-040-CV</td>
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			<td height="20" style="height:20px;">Hyclone Fetal Bovine Serum, Gamma irradiated&#160;</td>
			<td style="width:203px;">Fisher Scientific</td>
			<td>SH3091003IR</td>
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			<td height="20" style="height:20px;">Hyclone L-glutamine, 200mM</td>
			<td style="width:203px;">Fisher Scientific</td>
			<td>SH3003401</td>
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			<td height="20" style="height:20px;">Cellstar TC dish, 145x20mm, vented</td>
			<td style="width:203px;">Fisher Scientific</td>
			<td>T-2881-1</td>
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			<td height="20" style="height:20px;">Phorbol 12-myristate13-acetate (PMA)&#160;</td>
			<td style="width:203px;">Fisher Scientific</td>
			<td>BP685-1</td>
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			<td height="20" style="height:20px;">Ethylenediaminetetraacetic acid</td>
			<td style="width:203px;">Sigma</td>
			<td>E6758</td>
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			<td height="20" style="height:20px;">Oleic acid&#160;</td>
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			<td>ICN15178101</td>
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			<td height="20" style="height:20px;">Pierce RED Device Reusable Base Plate</td>
			<td style="width:203px;">Fisher Scientific</td>
			<td>PI-89811</td>
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			<td height="20" style="height:20px;">Pierce RED Device Inserts, 50/box&#160;</td>
			<td style="width:203px;">Fisher Scientific</td>
			<td>PI-89809</td>
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		<tr height="20">
			<td height="20" style="height:20px;">Pierce RED insert removal tool&#160;</td>
			<td style="width:203px;">Fisher Scientific</td>
			<td>89812</td>
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			<td height="20" style="height:20px;">Adhesive plate seal</td>
			<td style="width:203px;">Fisher Scientific</td>
			<td>08-408-240</td>
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			<td height="20" style="height:20px;">PBS, pH7.4, 10 X 500 mL (Gibco)&#160;</td>
			<td style="width:203px;">Life Technologies&#160;</td>
			<td>10010-049</td>
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			<td height="20" style="height:20px;width:443px;">DMSO</td>
			<td style="width:203px;">Sigma</td>
			<td>472301</td>
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			<td height="20" style="height:20px;width:443px;">Acetonitrile</td>
			<td style="width:203px;">Sigma</td>
			<td>34998</td>
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			<td height="20" style="height:20px;width:443px;">Methanol</td>
			<td style="width:203px;">Sigma</td>
			<td>34860</td>
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			<td height="20" style="height:20px;width:443px;">Verapamil hydrochloride</td>
			<td style="width:203px;">Sigma</td>
			<td>V4629</td>
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		<tr height="20">
			<td height="20" style="height:20px;width:443px;">Diclofenac sodium salt</td>
			<td style="width:203px;">Sigma</td>
			<td>93484</td>
			<td></td>
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		<tr height="20">
			<td height="20" style="height:20px;width:443px;">Trypan Blue Solution, 0.4%</td>
			<td style="width:203px;">Fisher Scientific</td>
			<td>15-250-061</td>
			<td></td>
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			<td height="20" style="height:20px;width:443px;">Ethanol, 200 proof</td>
			<td style="width:203px;">Fisher Scientific</td>
			<td>04-355-451</td>
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			<td height="20" style="height:20px;width:443px;">2010 Geno/Grinder</td>
			<td style="width:203px;">SPEX SamplePrep</td>
			<td style="width:147px;">2010</td>
			<td></td>
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		<tr height="20">
			<td height="20" style="height:20px;width:443px;">Bead Mill Homogenizer Accessory, Metal Bulk Beads</td>
			<td style="width:203px;">Fisher Scientific</td>
			<td>15-340-158</td>
			<td></td>
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			<td height="20" style="height:20px;width:443px;">484R Cobalt 60 Irradiator</td>
			<td style="width:203px;">JL Shepard</td>
			<td style="width:147px;">7810-484-1</td>
			<td></td>
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		<tr height="20">
			<td height="20" style="height:20px;width:443px;">INCYTO&#160;C-Chip Disposable Hemacytometers</td>
			<td style="width:203px;">Fisher Scientific</td>
			<td style="width:147px;">22-600-100</td>
			<td></td>
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		<tr height="20">
			<td height="20" style="height:20px;width:443px;">Upright Light Microscope</td>
			<td style="width:203px;">Leica</td>
			<td style="width:147px;">DM1000</td>
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			<td height="20" style="height:20px;width:443px;">Binary Liquid Chromatography system</td>
			<td style="width:203px;">Agilent</td>
			<td style="width:147px;">1260</td>
			<td>Multi-compenent</td>
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			<td height="20" style="height:20px;width:443px;">Mass spectrometer</td>
			<td style="width:203px;">AB Sciex</td>
			<td>4000</td>
			<td></td>
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an in vitro caseum binding assay that predicts drug penetration in tuberculosis lesions

The eradication of tuberculosis disease requires drug regimens that can penetrate the multiple layers of complex pulmonary lesions. Drug distribution in the caseous cores of cavities and lesions is especially crucial because they harbor subpopulations of drug-tolerant bacteria also commonly referred to as persisters. Existing methods for the measurement of drug penetration in tuberculosis lesions involve costly and time-consuming in vivo pharmacokinetic studies coupled to bioanalytical or imaging techniques. The in vitro measurement of drug binding to caseum macromolecules was proposed as an alternative to such techniques since this binding hinders the passive diffusion of drug molecules through caseum. Rapid equilibrium dialysis is a fast and reliable system for performing plasma protein and tissue binding studies. In this protocol, we used a rapid equilibrium dialysis (RED) device to measure drug binding to homogenates of caseum that is excised from the lesions and cavities of tuberculosis-infected rabbits. The protocol also describes how to generate a surrogate matrix from lipid loaded THP-1 macrophages to use in place of caseum. This caseum/surrogate binding assay is an important tool in tuberculosis drug discovery and can be adapted to help study drug distribution in lesions or abscesses caused by other diseases.

Using this protocol, we have tested hundreds of tuberculosis drug development compounds for their predicted efficiency at penetrating caseum. Figure 1 visualizes the basic concepts of the RED assay. The dialysis membrane of the RED inserts allows for unbound small molecules to diffuse from the donor well to the receiver well, finally achieving an equilibrium between both compartments. Small molecules that are bound to macromolecules such as proteins or lipids are trapped ...

Watch this Scientific Journal Video about An In Vitro Caseum Binding Assay that Predicts Drug Penetration in Tuberculosis Lesions at JoVE.com

An In Vitro Caseum Binding Assay that Predicts Drug Penetration in Tuberculosis Lesions

Here we describe a rapid equilibrium dialysis (RED) method to measure drug binding to caseum from pulmonary tuberculosis lesions and cavities. The protocol is also used with a foamy macrophage-derived matrix that is an effective surrogate to caseum.

An In Vitro Caseum Binding Assay that Predicts Drug Penetration in Tuberculosis Lesions

The eradication of tuberculosis disease requires drug regimens that can penetrate the multiple layers of complex pulmonary lesions. Drug distribution in ...

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