|
1
|
Horseman T, Rittase WB, Slaven JE, Bradfield DT, Frank AM, Anderson JA, Hays EC, Ott AC, Thomas AE, Huppmann AR, Lee SH, Burmeister DM, Day RM. Ferroptosis, Inflammation, and Microbiome Alterations in the Intestine in the Göttingen Minipig Model of Hematopoietic-Acute Radiation Syndrome. Int J Mol Sci 2024; 25:4535. [PMID: 38674120 PMCID: PMC11050692 DOI: 10.3390/ijms25084535] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 04/16/2024] [Accepted: 04/17/2024] [Indexed: 04/28/2024] Open
Abstract
Hematopoietic acute radiation syndrome (H-ARS) involves injury to multiple organ systems following total body irradiation (TBI). Our laboratory demonstrated that captopril, an angiotensin-converting enzyme inhibitor, mitigates H-ARS in Göttingen minipigs, with improved survival and hematopoietic recovery, as well as the suppression of acute inflammation. However, the effects of captopril on the gastrointestinal (GI) system after TBI are not well known. We used a Göttingen minipig H-ARS model to investigate captopril's effects on the GI following TBI (60Co 1.79 or 1.80 Gy, 0.42-0.48 Gy/min), with endpoints at 6 or 35 days. The vehicle or captopril (0.96 mg/kg) was administered orally twice daily for 12 days, starting 4 h post-irradiation. Ilea were harvested for histological, protein, and RNA analyses. TBI increased congestion and mucosa erosion and hemorrhage, which were modulated by captopril. GPX-4 and SLC7A11 were downregulated post-irradiation, consistent with ferroptosis at 6 and 35 days post-irradiation in all groups. Interestingly, p21/waf1 increased at 6 days in vehicle-treated but not captopril-treated animals. An RT-qPCR analysis showed that radiation increased the gene expression of inflammatory cytokines IL1B, TNFA, CCL2, IL18, and CXCL8, and the inflammasome component NLRP3. Captopril suppressed radiation-induced IL1B and TNFA. Rectal microbiome analysis showed that 1 day of captopril treatment with radiation decreased overall diversity, with increased Proteobacteria phyla and Escherichia genera. By 6 days, captopril increased the relative abundance of Enterococcus, previously associated with improved H-ARS survival in mice. Our data suggest that captopril mitigates senescence, some inflammation, and microbiome alterations, but not ferroptosis markers in the intestine following TBI.
Collapse
Affiliation(s)
- Timothy Horseman
- Department of Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA; (T.H.); (D.M.B.)
| | - W. Bradley Rittase
- Department of Pharmacology and Molecular Therapeutics, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA; (W.B.R.); (J.E.S.); (D.T.B.)
| | - John E. Slaven
- Department of Pharmacology and Molecular Therapeutics, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA; (W.B.R.); (J.E.S.); (D.T.B.)
| | - Dmitry T. Bradfield
- Department of Pharmacology and Molecular Therapeutics, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA; (W.B.R.); (J.E.S.); (D.T.B.)
| | - Andrew M. Frank
- Department of Anatomy, Physiology and Genetics, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA;
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, MD 20817, USA
| | - Joseph A. Anderson
- Comparative Pathology Division, Department of Laboratory Animal Resources, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA
| | - Evelyn C. Hays
- Department of Pharmacology and Molecular Therapeutics, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA; (W.B.R.); (J.E.S.); (D.T.B.)
| | - Andrew C. Ott
- Department of Pharmacology and Molecular Therapeutics, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA; (W.B.R.); (J.E.S.); (D.T.B.)
| | - Anjali E. Thomas
- Department of Pharmacology and Molecular Therapeutics, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA; (W.B.R.); (J.E.S.); (D.T.B.)
| | - Alison R. Huppmann
- Department of Biomedical Sciences, University of South Carolina School of Medicine, Greenville, SC 29605, USA;
| | - Sang-Ho Lee
- Pathology Department, Research Services, Naval Medical Research Center, Silver Spring, MD 20910, USA;
| | - David M. Burmeister
- Department of Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA; (T.H.); (D.M.B.)
| | - Regina M. Day
- Department of Pharmacology and Molecular Therapeutics, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA; (W.B.R.); (J.E.S.); (D.T.B.)
| |
Collapse
|
|
2
|
Crecelius EM, Lustik M, Horseman T, Jones M. 1662. The Prevalence of M. tuberculosis among Acid Fast Cultures from Military Health System Beneficiaries from Hawaii and Pacific Islands from January 2002 to November 2019. Open Forum Infect Dis 2020. [PMCID: PMC7778188 DOI: 10.1093/ofid/ofaa439.1840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Background Tuberculosis (TB), caused by Mycobacterium tuberculosis (MTB), is the leading infectious cause of death worldwide and the state of Hawaii (HI) has the second highest case rate of TB in the United States. The prevalence of TB among military health system (MHS) beneficiaries (active duty service members, retirees, dependents, civilians and eligible Pacific Island civilians) in HI has not been previously reported. Our analysis evaluates the prevalence of MTB among acid fast cultures (AFCs) tested at Tripler Army Medical Center (TAMC) on Oahu, HI and describes demographic factors associated with positive samples. Methods We analyzed AFC results from TAMC clinical diagnostic microbiology laboratory from January 2002 to November 2019. Demographic data were recorded for each individual with an AFC sample during the study period. Prevalence was calculated based on the number of MTB-positive AFCs per all AFCs over the study period. Multivariable logistic regression was used to evaluate associations between demographic factors and MTB-positive AFC results. Results From January 2002 to November 2019 there were 4768 AFCs resulted at TAMC with 49 MTB-positive AFC, leading to a cumulative prevalence of 1.03 percent (Figure 1). After controlling for other factors, Asian-Pacific Islanders had nearly 15 times higher odds of having a positive AFC than whites (OR=14.96, 95% CI 5.03, 44.55, p=< 0.001) and active duty personnel had 2.6 times the odds of having a positive AFC than dependents, civilians and retirees (OR=2.6, 95% CI 0.94, 7.22, p=0.067). Figure 1. The Prevalence of M. tuberculosis (MTB) among Acid Fast Cultures (AFC) from Military Health System Beneficiaries from Hawaii and Pacific Islands from January 2002 to November 2019. ![]()
Conclusion The low prevalence of MTB among AFCs performed at our institution over nearly 16 years suggests that living in the state of HI does not appear to confer high rates of TB to MHS beneficiaries. Persons with Asian-Pacific Islander ethnicity have higher odds of positive AFC which corroborates prior studies regarding risk factors for MTB. Further analysis is needed to further define risk factors associated with positive AFC among MHS beneficiaries in HI. Follow-up analysis is underway to describe the clinical course of the persons with MTB-positive AFC from this study. Disclosures All Authors: No reported disclosures
Collapse
|