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Transcriptional Profiling of Human Peripheral Blood Mononuclear Cells Exposed to Bacillus anthracis in vitro | OMICS International | Abstract
ISSN: 2157-2526

Journal of Bioterrorism & Biodefense
Open Access

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Research Article

Transcriptional Profiling of Human Peripheral Blood Mononuclear Cells Exposed to Bacillus anthracis in vitro

Rasha Hammamieh1*#, Nabarun Chakraborty1#, Mohsen Barmada3, Matthew Hellman3, Seid Muhie1, James Koterski2, Rina Das3 and Marti Jett1

1US Army Center for Environmental Health Research, 568 Doughten Drive, Fort Detrick, Maryland, 21702, USA

2USAMRIID, 1425 Porter Street, Fort Detrick, Maryland, 21702, USA

3Walter Reed Army Institute of Research, 503 Robert Grant Drive, Silver Spring, Maryland 20910, USA

#The authors contributed equally

*Corresponding Author:
Rasha Hammamieh
US Army Center for Environmental Health Research
568 Doughten Drive, Fort Detrick
Maryland, USA

Received Date: January 11, 2013; Accepted Date: March 08, 2013; Published Date: March 11, 2013

Citation: Hammamieh R, Chakraborty N, Barmada M, Hellman M, Muhie S, et al. (2013) Transcriptional Profiling of Human Peripheral Blood Mononuclear Cells Exposed to Bacillus anthracis in vitro. J Bioterr Biodef S3:014. doi: 10.4172/2157-2526.S3-014

Copyright: © 2013 Hammamieh R, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


Dependable and efficient diagnosis of Bacillus anthracis has long been a major concern for caregivers. Nonspecific symptoms during early illness often misguide the diagnosis; thereby jeopardize the proper therapeutic intervention. It is, therefore, crucial to understand the initial events that take place in a host soon after the onset of infection. The present study examines the transcriptional profile of human peripheral blood mononuclear cells (PBMCs) challenged by B. anthracis (BA) spores in vitro, and cultured for 2 hrs, 4hrs, 6 hrs, 8 hrs and 24 hrs, respectively. Transcriptomic assays support the past findings and identify novel targets for diagnosis and anthrax therapy. We observe rapid elevation of a number of transcripts encoding genes for cytokines, chemokines, and other uptake receptors, concurrently with onset of infection. Delayed responses to the BA include gradual attenuation of the genes linked with pathogenic uptake, such as MyD88 and TLR4, putatively extending the duration of host vulnerability. The signs of altering host defenses, nevertheless are evident immediately after the exposure to the B. anthracis spores. The pathogenic insult selectively induces some of the key genes for apoptotic pathways regulated by the toll-like receptors and the caspase cascade; and suppresses the transcripts related to the p38MAPK-dependent pathways. The T-cell receptors and CD3-mediated antigenic recognition processes are possibly restrained, and the expression of CD79, a B-cell committed CD marker, is suppressed. Overall, BA challenges both innate and adaptive immunity processes and their key interfaces during the early course of infection. We identified several early targets across the networks and pathways, primarily related to chemotaxis and apoptosis of immune cells that can potentially facilitate development of next generation anthrax prevention strategies.


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Citations : 840

Journal of Bioterrorism & Biodefense received 840 citations as per Google Scholar report

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