PET/CT imaging reveals a therapeutic response to oxazolidinones in macaques and humans with tuberculosis

M. Teresa Coleman, Ray Y. Chen, Myungsun Lee, Philana Ling Lin, Lori E. Dodd, Pauline Maiello, Laura E. Via, Youngran Kim, Gwendolyn Marriner, Veronique Dartois, Charles Scanga, Christopher Janssen, Jing Wang, Edwin Klein, Sang Nae Cho, Clifton E. Barry, Jo Anne L. Flynn

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98 Citations (Scopus)


Oxazolidinone antibiotics such as linezolid have shown significant therapeutic effects in patients with extensively drug-resistant (XDR) tuberculosis (TB) despite modest effects in rodents and no demonstrable early bactericidal activity in human phase 2 trials. We show that monotherapy with either linezolid or AZD5847, a second-generation oxazolidinone, reduced bacterial load at necropsy in Mycobacterium tuberculosis-infected cynomolgus macaques with active TB. This effect coincided with a decline in 2-deoxy-2-[18F]-fluoro-D-glucose positron emission tomography (FDG PET) imaging avidity in the lungs of these animals and with reductions in pulmonary pathology measured by serial computed tomography (CT) scans over 2 months of monotherapy. In a parallel phase 2 clinical study of linezolid in patients infected with XDR-TB, we also collected PET/CT imaging data from subjects receiving linezolid that had been added to their failing treatment regimens. Quantitative comparisons of PET/CT imaging changes in these human subjectswere similar inmagnitude to those observed inmacaques, demonstrating that the therapeutic effect of these oxazolidinones can be reproduced in this model of experimental chemotherapy. PET/CT imaging may be useful as an early quantitative measure of drug efficacy against TB in human patients.

Original languageEnglish
Article number265ra167
JournalScience Translational Medicine
Issue number265
Publication statusPublished - 2014 Dec 3

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© 2014; American Association for the Advancement of Science. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Medicine(all)


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