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The Use of Gene Expression Analysis and Proteomic Databases in the Development of a Screening System to Determine the Value of Natural Medicinal Products

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The Use of Gene Expression Analysis and Proteomic Databases in the Development of a Screening System to Determine the Value of Natural Medicinal Products Advance Access Publication 16 January 2006 eCAM 2006;3(1)65–70 doi:10.1093/ecam/nek001 Original Article The Use of Gene Expression Analysis and Proteomic Databases in The Development of a Screening System To Determine The Value of Natural Medicinal Products Sidney Katz1, Robert Harris2, Jeffrey Tien-Yau Lau1 and Adeline Chau1 1Division of Pharmacology and Toxicology, Faculty of Pharmaceutical Sciences, and 2Department of Zoology, University of British Columbia, Vancouver, Canada V6T 1Z3 A rapid throughput screening system involving gene expression analysis was developed in order to investigate the potential of bioactive chemicals contained in natural health products as effective drug therapy, in particular the ability of these chemicals to alleviate the inflammatory response in human air- way epithelial cells. A number of databases were searched to retrieve the information needed to properly analyze the gene expression profiles obtained. The gene expression of human bronchial epithelial cells infected with rhinovirus and/or exposed to platelet activating factor was analyzed. Following analysis of the gene expression data the total number of expressed proteins that may potentially act as a marker for monitoring the modulation of airway inflammation was narrowed to 19. Further studies will involve selecting antibodies for these proteins, culturing airway epithelial cells in the presence of extracts of nat- ural health products, extracting the proteins and identifying them by western blot analysis. Keywords: gene expression analysis – proteomic databases – airway epithelial cells Introduction exists concerning the therapeutic potential and pharmacolo- gical properties of echinacea. Airway inflammation is a feature of lung diseases and is char- As a result of the increased popularity of natural health acterized by airway swelling, excessive airway secretions, products, herbal medicinal products, such as echinacea, are cellular infiltration and increased airway responsiveness (1). being used more and more to treat the symptoms of airway These diseases include asthma, chronic obstructive pulmonary inflammatory diseases. However, the effects of these products diseases, chronic bronchitis, bronchiectasis and cystic fibrosis. on the inflammatory pathway have yet to be elucidated and the Herbal medicinal products are composed of bioactive chemic- efficacy of these products in treating airway inflammation is als, some of which may have therapeutic usefulness and some still debatable. The development of microarray technology which may be toxic (2). For example, echinacea preparations and gene expression analysis has proved to be a valuable tool contain many potentially active ingredients, such as polysac- in drug discovery and in understanding the molecular basis charides, glycoproteins, alkamides and flavonoids (3). This of human disease. By comparing the gene expression patterns herbal medicine has been traditionally used for the treatment of healthy airway tissue with airway tissue undergoing inflam- and prevention of upper respiratory tract infections and is usu- mation, it is possible to elucidate the genetic basis of airway ally marketed as an immune system booster (4). However, as inflammation and establish a means by which herbal medicinal with many other natural health products, much confusion products can be evaluated as to their effects on the inflammat- ory pathway. The purpose of this study was to develop a rapid throughput screening system to investigate the potential of the bioactive For reprints and all correspondence: Dr Sid Katz, University of British Columbia, 2146 East Mall, Vancouver, British Columbia, Canada V6T 1Z1. chemicals contained in natural health products as effective Tel: þ1-604-822-1947; Fax: þ1-604-263-5257; E-mail: [email protected] drug therapy. Of particular interest is the ability of these Ó The Author (2006). Published by Oxford University Press. All rights reserved. The online version of this article has been published under an open access model. Users are entitled to use, reproduce, disseminate, or display the open access version of this article for non-commercial purposes provided that: the original authorship is properly and fully attributed; the Journal and Oxford University Press are attributed as the original place of publication with the correct citation details given; if an article is subsequently reproduced or disseminated not in its entirety but only in part or as a derivative work this must be clearly indicated. For commercial re-use, please contact [email protected] 66 Potential of bioactive chemicals contained in natural health products AAAA AAAA AAAA AAAA Reverse In Vitro transcription Transcription Total mRNA cDNA cRNA Amplification and biotin labeling of antisense cRNA B B B B Fragmentation Hybridization and scanning Quantification Figure 1. AffymetrixGeneChip expression analysis. bioactive chemicals to alleviate the inflammatory response in gift from Dr D. C. Gruenert (University of California, San airway epithelial cells. Francisco). CFNPE9oÀ cells were maintained in minimum essential medium (MEM; Gibco BRL, Gaithersburg, MD) with 10 % fetal bovine serum (Gibco BRL) at pH 7.4 under a Methods humidified atmosphere of 5% CO2 (balance air) at 37 C. Cells were passaged every 4–5 days (at confluence) by exposure to Cell Culture 0.1% trypsin in phosphate buffered saline (PBS) for 5 min, The 16HBE14o- cell line, immortalized from primary cultures after which the cells were dislodged from the culture dish by of nasal polyp epithelial cells using the SV40 gene (5), was a gentle agitation and collected by centrifugation at 800 g for eCAM 2006;3(1) 67 Table 1. Proteomic databases utilized GeneChipÒ sets (containing probes for over 33 000 human genes) as described in the standard protocol outlined in the Ensembl http://www.ensembl.org GeneChipÒ Expression Analysis Technical Manual (Affymet- Source database http://source.stanford.edu rix). Each experimental sample RNA was processed and run on Online Mendelian http://http://www.ncbi.nlm.nih.gov/ Inheritance in Man (OMIM) entrez/query.fcgi?dp=OMIM separate HG-U133 chip sets. Briefly, cDNA was synthesized using T7-(dt) oligos and SuperScript II RT (Invitrogen, National Center for http://www.ncbi.nlm.nih.gov 24 Biotechnology Information Carlsbad, CA) followed by T4 Polymerase and was purified European Bioinformatic Institute http://www.ebi.ac.uk using Phase Lock Gel (Promega Corp., Madison, WI) and SwissProt database http://www.expasy.org/sprot/ phenol: chloroform extraction. Labeling was carried out using biotinylated CTP in an in vitro transcription reaction. The Gene Ontology Consortium http://www.geneontology.org/ resulting labeled cRNA was then fragmented according to Affymetrix protocols and added to the recommended hybrid- ization mixture. Approximately 10 mg of cRNA was used per 5 min. PBS consisted of (mM): NaCl (137), KCl (2.7), Affymetrix U-133 GeneChip A and BÒ sets. Hybridization Na2HPO4 (15.2) and KH2PO4 (1.5), pH 7.4. Pelleted cells 6 1 and washing were carried out in accordance with Affymetrix’s were then resuspended in MEM at 5 · 10 cells mlÀ , and pla- 5 2 established protocols. The probe array was scanned using an ted at a density of 5 · 10 cells cmÀ in 60 mm plastic culture Affymetrix confocal laser scanner. The scanner generated an dishes (Falcon, Becton Dickson and Co., Lincoln Park, NJ). image of the array by exciting each feature with its laser, detecting the resulting photon emissions from the fluorescently Drug Treatment labeled cRNA that had hybridized to the probes, and convert- Platelet Activating Factor (PAF) was obtained from Sigma ing the detected photon emissions into a 16-bit intensity value Chemical Co., dissolved in ethanol and diluted to the desired (6,7). The amount of light emitted at 570 nm was proportional concentration with MEM (final ethanol concentration to the bound target at each location on the probe array (8). was <0.01%). Cells were grown to confluence (usually 3– The probe array images generated by the scanner were then 4 days) and treated with 10 mM PAF for 12 h. Non-PAF treated ready for analysis using the Affymetrix Microarray Suite cells contained 0.01% ethanol to control for any potential eth- software. anol effect. Cells infected with rhinovirus were incubated for The use of microarray technology to monitor gene expres- 24 h in medium containing rhinovirus 14 (obtained from sion in cell lines and human tissues has become an important ATCC, Manassas, VA) at a viral concentration of 100 plaque part of biological research. It allows for the analysis of bio- forming units (PFUs)/ml. All incubations were conducted at chemical pathways, the identification of the genes responsible 37C. for a particular phenotype and the assessment of the effect of a compound on the expression level of a large number of RNA Extraction genes (6). The Affymetrix Microarray Suite software per- formed the operations necessary to process and analyze the Total RNA was extracted with the RNeasyÒ Mini Kit (Qiagen probe array, including: image segmentation, background Inc., Mississauga, ON). Briefly, upon termination of the correction, scaling/normalizing arrays for array-to-array com- incubation period, cells were washed twice with PBS at 4C, parisons, calculation of statistics to indicate whether a gene followed by exposure to 600 ml Buffer RLT at 4C for 5 min. transcript was present, and calculation of statistics to indicate Lysate was collected using a rubber policeman and transferred whether a
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