Detection of Klebsiella. Pneumoniae Infection with an Antisense Oligomer Against its Ribosomal RNA
Authors
Chen, LingCheng, Dengfeng
Liu, Guozheng
Dou, Shuping
Wang, Yuzhen
Liu, Xinrong
Liu, Yuxia
Rusckowski, Mary
UMass Chan Affiliations
Department of RadiologyDocument Type
Journal ArticlePublication Date
2016-02-01
Metadata
Show full item recordAbstract
PURPOSE: Previously, we demonstrated specific accumulation into bacteria of a 12-mer phosphorodiamidate morpholino (MORF) oligomer complementary to a ribosomal RNA (rRNA) segment found in all bacteria using the universal probe called Eub338 (Eub). Here, two MORF oligomers Eco and Kpn with sequences specific to the rRNA of Escherichia coli (Eco) and Klebsiella pneumoniae (Kpn) were investigated along with Eub and control (nonEub). PROCEDURES: To determine bacterial rRNA binding, oligomers were tagged with Alexa Fluor 633 (AF633) for fluorescence in situ hybridization (FISH) and fluorescence microscopy, and radiolabeled with technetium-99m (Tc-99m) for biodistribution and SPECT imaging in infected mice. RESULTS: By both FISH and fluorescence microscopy, Eub showed a positive signal in both E. coli and K. pneumoniae as expected, and Kpn showed significantly higher accumulation in K. pneumoniae with near background in E. coli (p < 0.01). Conversely, Eco was positive in both E. coli and K. pneumoniae, hence nonspecific. As determined by biodistribution, the accumulation of [99mTc]Kpn was higher in the thigh infected with live K. pneumoniae than with live E. coli (p = 0.05), and significantly higher than with heat-killed K. pneumoniae (p = 0.02) in the target thigh. By SPECT imaging, the accumulation of [99mTc]Kpn was obviously higher in its specific target of K. pneumoniae compared to an E. coli infected thigh. CONCLUSIONS: Kpn complementary to the rRNA of K. pneumoniae, labeled with Tc-99m or AF633, demonstrated specific binding to fixed and live K. pneumoniae in culture and in infected mice such that Tc-99m-labeled Kpn as the MORF oligomer may be useful for K. pneumoniae infection detection through imaging.Source
Mol Imaging Biol. 2016 Feb 1. Link to article on publisher's siteDOI
10.1007/s11307-015-0927-4Permanent Link to this Item
http://hdl.handle.net/20.500.14038/48034PubMed ID
26832678Related Resources
Link to Article in PubMedae974a485f413a2113503eed53cd6c53
10.1007/s11307-015-0927-4