- Mutational inactivation of OprD in carbapenem-resistant Pseudomonas aeruginosa isolates from Korean hospitals
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Chi Hyun Kim , Hee Young Kang , Bo Ra Kim , Hyejin Jeon , Yoo Chul Lee , Sang Hwa Lee , Je Chul Lee
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J. Microbiol. 2016;54(1):44-49. Published online January 5, 2016
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DOI: https://doi.org/10.1007/s12275-016-5562-5
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1,406
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 Abstract
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This study investigated the mechanisms underlying the carbapenem
resistance of bloodstream isolates of Pseudomonas
aeruginosa obtained from two Korean hospitals. Of the 79
P. aeruginosa isolates, 22 and 21 were resistant to imipenem
and meropenem, respectively. The 22 imipenem-resistant
P. aeruginosa isolates were classified into 7 sequence types
(STs) and 13 pulsotypes. Twelve imipenem-resistant isolates
from one hospital were found to belong to the international
clone ST111. Two imipenem-resistant P. aeruginosa ST235
isolates carried the blaIMP-6 gene, but the remaining 20 isolates
did not produce carbapenemases. Mutations in the oprD
gene and a related decrease in gene expression were found
in 21 and 5 isolates, respectively. However, all imipenemresistant
P. aeruginosa isolates showed no significant expression
of OprD in the outer membrane as compared with that
of carbapenem-susceptible PAO1 strain. Overexpression of
genes associated with efflux pumps, including mexB, mexD,
mexF, and mexY, was not found in any imipenem-resistant
isolate. One imipenem-resistant P. aeruginosa isolate overexpressed
the ampC gene. Our results show that the low permeability
of drugs due to the mutational inactivation of OprD
is primarily responsible for carbapenem resistance in bloodstream
isolates of P. aeruginosa from Korean hospitals.
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Citations
Citations to this article as recorded by 
- Immunostimulatory Activity of Dendritic Cells Pulsed with Carbonic Anhydrase IX and Acinetobacter baumannii Outer Membrane Protein A for Renal Cell Carcinoma
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Bo Ra Kim , Eun Kyoung Yang , Sun Hee Kim , Dong Chan Moon , Hwa Jung Kim , Je Chul Lee , Duk Yoon Kim
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J. Microbiol. 2011;49(1):115-120. Published online March 3, 2011
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DOI: https://doi.org/10.1007/s12275-011-1037-x
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682
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0
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3
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Abstract
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Dendritic cell (DC)-based immunotherapy is a potent therapeutic modality for treating renal cell carcinoma (RCC), but development of antigens specific for tumor-targeting and anti-tumor immunity is of great interest for clinical trials. The present study investigated the ability of DCs pulsed with a combination of carbonic anhydrase IX (CA9) as an RCC-specific biomarker and Acinetobacter baumannii outer membrane protein A (AbOmpA) as an immunoadjuvant to induce anti-tumor immunity against murine renal cell carcinoma (RENCA) in a murine model. Murine bone-marrow-derived DCs pulsed with a combination of RENCA lysates and AbOmpA were tested for their capacity to induce DC maturation and T cell responses in vitro. A combination of RENCA lysates and AbOmpA up-regulated the surface expression of co-stimulatory molecules, CD80 and CD86, and the antigen presenting molecules, major histocompatibility (MHC) class I and class II, in DCs. A combination of RENCA lysates and AbOmpA also induced interleukin-12 (IL-12) production in DCs. Next, the immunostimulatory activity of DCs pulsed with a combination of CA9 and AbOmpA
was determined. A combination of CA9 and AbOmpA up-regulated the surface expression of co-stimulatory molecules and antigen presenting molecules in DCs. DCs pulsed with a combination of CA9 and AbOmpA effectively secreted IL-12 but not IL-10. These cells interacted with T cells and formed clusters. DCs pulsed
with CA9 and AbOmpA elicited the secretion of interferon-γ and IL-2 in T cells. In conclusion, a combination of CA9 and AbOmpA enhanced the immunostimulatory activity of DCs, which may effectively induce anti-tumor immunity against human RCC.
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Citations
Citations to this article as recorded by - The Outer Membrane Proteins OmpA, CarO, and OprD of Acinetobacter baumannii Confer a Two-Pronged Defense in Facilitating Its Success as a Potent Human Pathogen
Siva R. Uppalapati, Abhiroop Sett, Ranjana Pathania
Frontiers in Microbiology.2020;[Epub] CrossRef - Host Innate Immune Responses to Acinetobacter baumannii Infection
Wangxue Chen
Frontiers in Cellular and Infection Microbiology.2020;[Epub] CrossRef - Generation of anti-tumour immune response using dendritic cells pulsed with carbonic anhydrase IX-Acinetobacter baumanniiouter membrane protein A fusion proteins against renal cell carcinoma
B-R Kim, E-K Yang, D-Y Kim, S-H Kim, D-C Moon, J-H Lee, H-J Kim, J-C Lee
Clinical and Experimental Immunology.2011; 167(1): 73. CrossRef
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