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Dudis RS, Wong TY, Escatte MG, Alamneh YA, Abu-Taleb R, Su W, Czintos C, Fitzgerald TA, Le Breton Y, Zurawski DV. Longitudinal temperature measurement can determine humane endpoints in BALB/c mouse models of ESKAPEE infection. Virulence 2023; 14:2186331. [PMID: 36976806 PMCID: PMC10054282 DOI: 10.1080/21505594.2023.2186331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023] Open
Abstract
Antimicrobial resistance (AMR) is a worldwide problem, which is driving more preclinical research to find new treatments and countermeasures for drug-resistant bacteria. However, translational models in the preclinical space have remained static for years. To improve animal use ethical considerations, we assessed novel methods to evaluate survival after lethal infection with ESKAPEE pathogens (Enterococcus faecium, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, Enterobacter cloacae, and Escherichia coli) in pulmonary models of infection. Consistent with published lung infection models often used for novel antimicrobial development, BALB/c mice were immunosuppressed with cyclophosphamide and inoculated intranasally with individual ESKAPEE pathogens or sterile saline. Observations were recorded at frequent intervals to determine predictive thresholds for humane endpoint decision-making. Internal temperature was measured via implanted IPTT300 microchips, and external temperature was measured using a non-contact, infrared thermometer. Additionally, clinical scores were evaluated based on animal appearance, behaviour, hydration status, respiration, and body weight. Internal temperature differences between survivors and non-survivors were statistically significant for E. faecium, S. aureus, K. pneumoniae, A. baumannii, E. cloacae, and E. coli, and external temperature differences were statistically significant for S. aureus, K. pneumoniae, E. cloacae, and E. coli. Internal temperature more precisely predicted mortality compared to external temperature, indicating that a threshold of 85ºF (29.4ºC) was 86.0% predictive of mortality and 98.7% predictive of survival. Based on our findings, we recommend future studies involving BALB/c mice ESKAPEE pathogen infection use temperature monitoring as a humane endpoint threshold.
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Affiliation(s)
- Randal Scott Dudis
- Veterinary Services Program, Center for Enabling Capabilities, Walter Reed Army Institute of Research, Silver Spring, MD, USA
| | - Ting Y Wong
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Diseases Research, Walter Reed Army Institute of Research, Silver Spring, MD, USA
| | - Mariel G Escatte
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Diseases Research, Walter Reed Army Institute of Research, Silver Spring, MD, USA
| | - Yonas A Alamneh
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Diseases Research, Walter Reed Army Institute of Research, Silver Spring, MD, USA
| | - Rania Abu-Taleb
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Diseases Research, Walter Reed Army Institute of Research, Silver Spring, MD, USA
| | - Wanwen Su
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Diseases Research, Walter Reed Army Institute of Research, Silver Spring, MD, USA
| | - Christine Czintos
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Diseases Research, Walter Reed Army Institute of Research, Silver Spring, MD, USA
| | - Timothy A Fitzgerald
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Diseases Research, Walter Reed Army Institute of Research, Silver Spring, MD, USA
| | - Yoann Le Breton
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Diseases Research, Walter Reed Army Institute of Research, Silver Spring, MD, USA
| | - Daniel V Zurawski
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Diseases Research, Walter Reed Army Institute of Research, Silver Spring, MD, USA
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Dollery SJ, Zurawski DV, Bushnell RV, Tobin JK, Wiggins TJ, MacLeod DA, Tasker NJPER, Alamneh YA, Abu-Taleb R, Czintos CM, Su W, Escatte MG, Meeks HN, Daly MJ, Tobin GJ. Whole-cell vaccine candidates induce a protective response against virulent Acinetobacter baumannii. Front Immunol 2022; 13:941010. [PMID: 36238282 PMCID: PMC9553005 DOI: 10.3389/fimmu.2022.941010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Accepted: 09/02/2022] [Indexed: 11/13/2022] Open
Abstract
Acinetobacter baumannii causes multi-system diseases in both nosocomial settings and a pre-disposed general population. The bacterium is not only desiccation-resistant but also notoriously resistant to multiple antibiotics and drugs of last resort including carbapenem, colistin, and sulbactam. The World Health Organization has categorized carbapenem-resistant A. baumannii at the top of its critical pathogen list in a bid to direct urgent countermeasure development. Several early-stage vaccines have shown a range of efficacies in healthy mice, but no vaccine candidates have advanced into clinical trials. Herein, we report our findings that both an ionizing γ-radiation-inactivated and a non-ionizing ultraviolet C-inactivated whole-cell vaccine candidate protects neutropenic mice from pulmonary challenge with virulent AB5075, a particularly pathogenic isolate. In addition, we demonstrate that a humoral response is sufficient for this protection via the passive immunization of neutropenic mice.
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Affiliation(s)
- Stephen J. Dollery
- Biological Mimetics, Inc., Frederick, MD, United States
- *Correspondence: Stephen J. Dollery,
| | - Daniel V. Zurawski
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Disease Research, Walter Reed Army Institute of Research, Silver Spring, MD, United States
| | | | - John K. Tobin
- Biological Mimetics, Inc., Frederick, MD, United States
| | | | | | | | - Yonas A. Alamneh
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Disease Research, Walter Reed Army Institute of Research, Silver Spring, MD, United States
| | - Rania Abu-Taleb
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Disease Research, Walter Reed Army Institute of Research, Silver Spring, MD, United States
| | - Christine M. Czintos
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Disease Research, Walter Reed Army Institute of Research, Silver Spring, MD, United States
| | - Wanwen Su
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Disease Research, Walter Reed Army Institute of Research, Silver Spring, MD, United States
| | - Mariel G. Escatte
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Disease Research, Walter Reed Army Institute of Research, Silver Spring, MD, United States
| | - Heather N. Meeks
- Defense Threat Reduction Agency, Fort Belvoir, VA, United States
| | - Michael J. Daly
- Department of Pathology, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
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Dollery SJ, Zurawski DV, Gaidamakova EK, Matrosova VY, Tobin JK, Wiggins TJ, Bushnell RV, MacLeod DA, Alamneh YA, Abu-Taleb R, Escatte MG, Meeks HN, Daly MJ, Tobin GJ. Radiation-Inactivated Acinetobacter baumannii Vaccine Candidates. Vaccines (Basel) 2021; 9:vaccines9020096. [PMID: 33514059 PMCID: PMC7912630 DOI: 10.3390/vaccines9020096] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 01/22/2021] [Accepted: 01/23/2021] [Indexed: 12/20/2022] Open
Abstract
Acinetobacter baumannii is a bacterial pathogen that is often multidrug-resistant (MDR) and causes a range of life-threatening illnesses, including pneumonia, septicemia, and wound infections. Some antibiotic treatments can reduce mortality if dosed early enough before an infection progresses, but there are few other treatment options when it comes to MDR-infection. Although several prophylactic strategies have been assessed, no vaccine candidates have advanced to clinical trials or have been approved. Herein, we rapidly produced protective whole-cell immunogens from planktonic and biofilm-like cultures of A. baumannii, strain AB5075 grown using a variety of methods. After selecting a panel of five cultures based on distinct protein profiles, replicative activity was extinguished by exposure to 10 kGy gamma radiation in the presence of a Deinococcus antioxidant complex composed of manganous (Mn2+) ions, a decapeptide, and orthophosphate. Mn2+ antioxidants prevent hydroxylation and carbonylation of irradiated proteins, but do not protect nucleic acids, yielding replication-deficient immunogenic A. baumannii vaccine candidates. Mice were immunized and boosted twice with 1.0 × 107 irradiated bacterial cells and then challenged intranasally with AB5075 using two mouse models. Planktonic cultures grown for 16 h in rich media and biofilm cultures grown in static cultures underneath minimal (M9) media stimulated immunity that led to 80–100% protection.
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Affiliation(s)
- Stephen J. Dollery
- Biological Mimetics, Inc., 124 Byte Drive, Frederick, MD 21702, USA; (J.K.T.); (T.J.W.); (R.V.B.); (D.A.M.); (G.J.T.)
- Correspondence:
| | - Daniel V. Zurawski
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Disease Research, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA; (D.V.Z.); (Y.A.A.); (R.A.-T.); (M.G.E.)
| | - Elena K. Gaidamakova
- Department of Pathology, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA; (E.K.G.); (V.Y.M.); (M.J.D.)
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD 20817, USA
| | - Vera Y. Matrosova
- Department of Pathology, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA; (E.K.G.); (V.Y.M.); (M.J.D.)
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD 20817, USA
| | - John K. Tobin
- Biological Mimetics, Inc., 124 Byte Drive, Frederick, MD 21702, USA; (J.K.T.); (T.J.W.); (R.V.B.); (D.A.M.); (G.J.T.)
| | - Taralyn J. Wiggins
- Biological Mimetics, Inc., 124 Byte Drive, Frederick, MD 21702, USA; (J.K.T.); (T.J.W.); (R.V.B.); (D.A.M.); (G.J.T.)
| | - Ruth V. Bushnell
- Biological Mimetics, Inc., 124 Byte Drive, Frederick, MD 21702, USA; (J.K.T.); (T.J.W.); (R.V.B.); (D.A.M.); (G.J.T.)
| | - David A. MacLeod
- Biological Mimetics, Inc., 124 Byte Drive, Frederick, MD 21702, USA; (J.K.T.); (T.J.W.); (R.V.B.); (D.A.M.); (G.J.T.)
| | - Yonas A. Alamneh
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Disease Research, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA; (D.V.Z.); (Y.A.A.); (R.A.-T.); (M.G.E.)
| | - Rania Abu-Taleb
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Disease Research, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA; (D.V.Z.); (Y.A.A.); (R.A.-T.); (M.G.E.)
| | - Mariel G. Escatte
- Wound Infections Department, Bacterial Diseases Branch, Center for Infectious Disease Research, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA; (D.V.Z.); (Y.A.A.); (R.A.-T.); (M.G.E.)
| | | | - Michael J. Daly
- Department of Pathology, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA; (E.K.G.); (V.Y.M.); (M.J.D.)
| | - Gregory J. Tobin
- Biological Mimetics, Inc., 124 Byte Drive, Frederick, MD 21702, USA; (J.K.T.); (T.J.W.); (R.V.B.); (D.A.M.); (G.J.T.)
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