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Vercellino J, Małachowska B, Kulkarni S, Bell BI, Shajahan S, Shinoda K, Eichenbaum G, Verma AK, Ghosh SP, Yang WL, Frenette PS, Guha C. Thrombopoietin mimetic stimulates bone marrow vascular and stromal niches to mitigate acute radiation syndrome. Stem Cell Res Ther 2024; 15:123. [PMID: 38679747 PMCID: PMC11057170 DOI: 10.1186/s13287-024-03734-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Accepted: 04/16/2024] [Indexed: 05/01/2024] Open
Abstract
BACKGROUND Acute radiation syndrome (ARS) manifests after exposure to high doses of radiation in the instances of radiologic accidents or incidents. Facilitating regeneration of the bone marrow (BM), namely the hematopoietic stem and progenitor cells (HSPCs), is key in mitigating ARS and multi-organ failure. JNJ-26366821, a PEGylated thrombopoietin mimetic (TPOm) peptide, has been shown as an effective medical countermeasure (MCM) to treat hematopoietic-ARS (H-ARS) in mice. However, the activity of TPOm on regulating BM vascular and stromal niches to support HSPC regeneration has yet to be elucidated. METHODS C57BL/6J mice (9-14 weeks old) received sublethal or lethal total body irradiation (TBI), a model for H-ARS, by 137Cs or X-rays. At 24 h post-irradiation, mice were subcutaneously injected with a single dose of TPOm (0.3 mg/kg or 1.0 mg/kg) or PBS (vehicle). At homeostasis and on days 4, 7, 10, 14, 18, and 21 post-TBI with and without TPOm treatment, BM was harvested for histology, BM flow cytometry of HSPCs, endothelial (EC) and mesenchymal stromal cells (MSC), and whole-mount confocal microscopy. For survival, irradiated mice were monitored and weighed for 30 days. Lastly, BM triple negative cells (TNC; CD45-, TER-119-, CD31-) were sorted for single-cell RNA-sequencing to examine transcriptomics after TBI with or without TPOm treatment. RESULTS At homeostasis, TPOm expanded the number of circulating platelets and HSPCs, ECs, and MSCs in the BM. Following sublethal TBI, TPOm improved BM architecture and promoted recovery of HSPCs, ECs, and MSCs. Furthermore, TPOm elevated VEGF-C levels in normal and irradiated mice. Following lethal irradiation, mice improved body weight recovery and 30-day survival when treated with TPOm after 137Cs and X-ray exposure. Additionally, TPOm reduced vascular dilation and permeability. Finally, single-cell RNA-seq analysis indicated that TPOm increased the expression of collagens in MSCs to enhance their interaction with other progenitors in BM and upregulated the regeneration pathway in MSCs. CONCLUSIONS TPOm interacts with BM vascular and stromal niches to locally support hematopoietic reconstitution and systemically improve survival in mice after TBI. Therefore, this work warrants the development of TPOm as a potent radiation MCM for the treatment of ARS.
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Affiliation(s)
- Justin Vercellino
- Department of Radiation Oncology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY, 10461, USA
- Department of Pathology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Beata Małachowska
- Department of Radiation Oncology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY, 10461, USA
| | - Shilpa Kulkarni
- Department of Radiation Oncology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY, 10461, USA
- National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD, USA
| | - Brett I Bell
- Department of Radiation Oncology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY, 10461, USA
- Department of Pathology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Shahin Shajahan
- Department of Radiation Oncology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY, 10461, USA
| | - Kosaku Shinoda
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Gary Eichenbaum
- Johnson & Johnson, Office of the Chief Medical Officer, New Brunswick, NJ, USA
- Bioconvergent Health, LLC, Purchase, NY, USA
| | - Amit K Verma
- Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Sanchita P Ghosh
- Armed Forces Radiobiology Research Institute, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Weng-Lang Yang
- Department of Radiation Oncology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY, 10461, USA
| | - Paul S Frenette
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Chandan Guha
- Department of Radiation Oncology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY, 10461, USA.
- Department of Pathology, Albert Einstein College of Medicine, Bronx, NY, USA.
- Bioconvergent Health, LLC, Purchase, NY, USA.
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Vercellino J, Małachowska B, Kulkarni S, Bell BI, Shajahan S, Shinoda K, Eichenbaum G, Verma AK, Ghosh SP, Yang WL, Frenette PS, Guha C. Thrombopoietin mimetic stimulates bone marrow vascular and stromal niches to mitigate acute radiation syndrome. RESEARCH SQUARE 2024:rs.3.rs-3946910. [PMID: 38463959 PMCID: PMC10925435 DOI: 10.21203/rs.3.rs-3946910/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
Background Acute radiation syndrome (ARS) manifests after exposure to high doses of radiation in the instances of radiologic accidents or incidents. Facilitating the regeneration of the bone marrow (BM), namely the hematopoietic stem and progenitor cells (HSPCs), is a key in mitigating ARS and multi-organ failure. JNJ-26366821, a PEGylated thrombopoietin mimetic (TPOm) peptide, has been shown as an effective medical countermeasure (MCM) to treat hematopoietic-ARS (H-ARS) in mice. However, the activity of TPOm on regulating BM vascular and stromal niches to support HSPC regeneration has not yet been elucidated. Methods C57BL/6J mice (9-14 weeks old) received sublethal or lethal total body irradiation (TBI), a model for H-ARS, by 137Cs or X-rays. At 24 hours post-irradiation, mice were subcutaneously injected with a single dose of TPOm (0.3 mg/kg or 1.0 mg/kg) or PBS (vehicle). At homeostasis and on days 4, 7, 10, 14, 18, and 21 post-TBI with and without TPOm treatment, BM was harvested for histology, BM flow cytometry of HSPCs, endothelial (EC) and mesenchymal stromal cells (MSC), and whole-mount confocal microscopy. For survival, irradiated mice were monitored and weighed for 30 days. Lastly, BM triple negative cells (TNC; CD45-, TER-119-, CD31-) were sorted for single-cell RNA-sequencing to examine transcriptomics after TBI with or without TPOm treatment. Results At homeostasis, TPOm expanded the number of circulating platelets and HSPCs, ECs, and MSCs in the BM. Following sublethal TBI, TPOm improved BM architecture and promoted recovery of HSPCs, ECs, and MSCs. Furthermore, TPOm elevated VEGF-C levels in normal and irradiated mice. Following lethal irradiation, mice improved body weight recovery and 30-day survival when treated with TPOm after 137Cs and X-ray exposure. Additionally, TPOm reduced vascular dilation and permeability. Finally, single-cell RNA-seq analysis indicated that TPOm increased the expression of collagens in MSCs to enhance their interaction with other progenitors in BM and upregulated the regeneration pathway in MSCs. Conclusions TPOm interacts with BM vascular and stromal niches to locally support hematopoietic reconstitution and systemically improve survival in mice after TBI. Therefore, this work warrants the development of TPOm as a potent radiation MCM for the treatment of ARS.
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Affiliation(s)
| | | | - Shilpa Kulkarni
- NIAID: National Institute of Allergy and Infectious Diseases
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Kumari P, Kumar R, Singh D, Kumar R. N-acetyl-L-tryptophan (NAT) provides protection to intestinal epithelial cells (IEC-6) against radiation-induced apoptosis via modulation of oxidative stress and mitochondrial membrane integrity. Mol Biol Rep 2023; 50:6381-6397. [PMID: 37322322 DOI: 10.1007/s11033-023-08579-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 06/02/2023] [Indexed: 06/17/2023]
Abstract
BACKGROUND Ionizing radiation generates oxidative stress in biological systems via inducing free radicals. Gastro-intestinal system has been known for its high radiosensitivity. Therefore, to develop an effective radiation countermeasure for gastrointestinal system, N-acetyl L-tryptophan was evaluated for its radioprotective efficacy using intestinal epithelial cells-6 (IEC-6) cells as the experimental model. METHODS AND RESULTS Cellular metabolic and lysosomal activity of L-NAT and L-NAT treated irradiated IEC-6 cells were assessed by MTT and NRU staining, respectively. ROS and mitochondrial superoxide levels along with mitochondrial disruption were detected using specific fluorescent probes. Endogenous antioxidants (CAT, SOD, GST, GPx) activities were determined using calorimetric assay. Apoptosis and DNA damage were assessed using flow cytometery and Comet assay, respectively. Results of the study were demonstrated that L-NAT pre-treatment (- 1 h) to irradiated IEC-6 cells significantly contribute to ensuring 84.36% to 87.68% (p < 0.0001) survival at 0.1 μg/mL concentration against LD50 radiation dose (LD50; 20 Gy). Similar level of radioprotection was observed with a clonogenic assay against γ radiation (LD50; 5 Gy). L-NAT was found to provide radioprotection by neutralizing radiation-induced oxidative stress, enhancing antioxidant enzymes (CAT, SOD, GST, and GPx), and protecting DNA from radiation-induced damage. Further, significant restoration of mitochondrial membrane integrity along with apoptosis inhibition was observed with irradiated IEC-6 cells upon L-NAT pretreatment.
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Affiliation(s)
- Pratibha Kumari
- Radiation Biotechnology Group, Division of Chemical, Biological, Radiological & Nuclear Defence (CBRN), Defence Research and Development Organization (DRDO), Institute of Nuclear Medicine and Allied Sciences, Brig. S.K. Mazumdar Road, Timarpur, Delhi, 110054, India
| | - Ravi Kumar
- Radiation Biotechnology Group, Division of Chemical, Biological, Radiological & Nuclear Defence (CBRN), Defence Research and Development Organization (DRDO), Institute of Nuclear Medicine and Allied Sciences, Brig. S.K. Mazumdar Road, Timarpur, Delhi, 110054, India
| | - Darshana Singh
- Radiation Biotechnology Group, Division of Chemical, Biological, Radiological & Nuclear Defence (CBRN), Defence Research and Development Organization (DRDO), Institute of Nuclear Medicine and Allied Sciences, Brig. S.K. Mazumdar Road, Timarpur, Delhi, 110054, India
| | - Raj Kumar
- Radiation Biotechnology Group, Division of Chemical, Biological, Radiological & Nuclear Defence (CBRN), Defence Research and Development Organization (DRDO), Institute of Nuclear Medicine and Allied Sciences, Brig. S.K. Mazumdar Road, Timarpur, Delhi, 110054, India.
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Haritwal T, Kalra N, Agrawala PK. Mitigation of radiation injury to reproductive system of male mice by Trichostatin A. MUTATION RESEARCH. GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2022; 881:503522. [PMID: 36031339 DOI: 10.1016/j.mrgentox.2022.503522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 06/14/2022] [Accepted: 06/27/2022] [Indexed: 06/15/2023]
Abstract
Trichostatin A (TSA), derived from the bacteria Streptomyces hygroscopicus, is a hydroxamic acid having various biological properties such as histone deacetylase inhibition, anticancer and radiomitigative action. However the mitigative activity of TSA against radiation-induced damages in the mouse reproductive system has not yet been elucidated. The present study unraveled the effects of 2 Gy whole body irradiation (60Co γ- radiation) on C57BL/6 mice male reproductive system including structural damages to testes, increase in apoptosis and reduction in germ cell viability, reduced fertility as well as increased genomic instability in the next generation. Moreover, hematological study and micronuclei assay were used to record chances of radiation-induced hematologic cancer and disruption of genomic integrity in F1 generation. Interestingly, TSA administration 1 and 24 h post-irradiation attenuated radiation-induced morphological damage and cellular apoptosis in testes. In male mice, TSA restored hematological parameters and micronuclei frequency to normal levels, restored sperm viability, and helped them overcome radiation-induced temporary sterility 5 weeks after the irradiation. Thus our results showed that TSA reduced the probability of radiation-induced hematologic cancers as well as genotoxicity and restored genomic integrity in the progenies of paternally exposed mice by reducing radiation-induced apoptosis in spermatogenic cells and restoring cell proliferation. This study suggested that TSA could be used as potential radiomitigator for male reproductive system.
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Affiliation(s)
- Teena Haritwal
- Radiation Genetics and Epigenetics, Institute of Nuclear Medicine and Allied Sciences, Brig SK Mazumdar Marg, Timarpur, Delhi 110054, India
| | - Namita Kalra
- Radiation Genetics and Epigenetics, Institute of Nuclear Medicine and Allied Sciences, Brig SK Mazumdar Marg, Timarpur, Delhi 110054, India
| | - Paban K Agrawala
- Radiation Genetics and Epigenetics, Institute of Nuclear Medicine and Allied Sciences, Brig SK Mazumdar Marg, Timarpur, Delhi 110054, India.
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Nanduri LSY, Duddempudi PK, Yang WL, Tamarat R, Guha C. Extracellular Vesicles for the Treatment of Radiation Injuries. Front Pharmacol 2021; 12:662437. [PMID: 34084138 PMCID: PMC8167064 DOI: 10.3389/fphar.2021.662437] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 05/04/2021] [Indexed: 01/02/2023] Open
Abstract
Normal tissue injury from accidental or therapeutic exposure to high-dose radiation can cause severe acute and delayed toxicities, which result in mortality and chronic morbidity. Exposure to single high-dose radiation leads to a multi-organ failure, known as acute radiation syndrome, which is caused by radiation-induced oxidative stress and DNA damage to tissue stem cells. The radiation exposure results in acute cell loss, cell cycle arrest, senescence, and early damage to bone marrow and intestine with high mortality from sepsis. There is an urgent need for developing medical countermeasures against radiation injury for normal tissue toxicity. In this review, we discuss the potential of applying secretory extracellular vesicles derived from mesenchymal stromal/stem cells, endothelial cells, and macrophages for promoting repair and regeneration of organs after radiation injury.
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Affiliation(s)
- Lalitha Sarad Yamini Nanduri
- Department of Radiation Oncology, Albert Einstein College of Medicine, Montefiore Medical Center, New York, NY, United States
| | - Phaneendra K. Duddempudi
- Department of Biochemistry, Albert Einstein College of Medicine, Montefiore Medical Center, New York, NY, United States
| | - Weng-Lang Yang
- Department of Radiation Oncology, Albert Einstein College of Medicine, Montefiore Medical Center, New York, NY, United States
| | - Radia Tamarat
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Fontenay-aux-Roses, France
| | - Chandan Guha
- Department of Radiation Oncology, Albert Einstein College of Medicine, Montefiore Medical Center, New York, NY, United States
- Department of Pathology, Albert Einstein College of Medicine, Montefiore Medical Center, New York, NY, United States
- Department of Urology, Albert Einstein College of Medicine, Montefiore Medical Center, New York, NY, United States
- Institute for Onco-Physics, Albert Einstein College of Medicine, Montefiore Medical Center, New York, NY, United States
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Doyle-Eisele M, Brower J, Aiello K, Ferranti E, Yaeger M, Wu G, Weber W. Developing and comparing models of hematopoietic-acute radiation syndrome in Göttingen and Sinclair minipigs. Int J Radiat Biol 2020; 97:S73-S87. [PMID: 32909874 DOI: 10.1080/09553002.2020.1820604] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
PURPOSE Current animal models of hematopoietic-acute radiation syndrome (H-ARS) are resource intensive and have limited translation to humans, thereby inhibiting the development of effective medical countermeasures (MCM)s for radiation exposure. MATERIALS AND METHODS To improve the MCM pipeline, we developed models of H-ARS in male Göttingen and Sinclair minipigs. Weight matched Göttingens and Sinclairs received total body irradiation (TBI; 1.50-2.10 Gy and 1.94-2.90 Gy, respectively), were observed for up to 45 days with blood collections for clinical pathology analysis, and were examined during gross necropsy. RESULTS The lethal dose for 50% of the population over the course of 45 days (LD50/45) with 'field' supportive care (primarily antibiotics and hydration support) and implanted vascular access ports was 1.89 and 2.53 Gy for Göttingens and Sinclairs, respectively. Both minipig strains exhibited prototypical H-ARS characteristics, experiencing thrombocytopenia and neutropenia, and nadirs approximately 14 days following irradiation, slightly varying with dose. Both strains experienced increased bruising, petechia, and signs of internal hemorrhage in the lungs, GI, heart, and skin. All observations were noted to correlate with dose more closely in Sinclairs than in Göttingens. CONCLUSION The results of this study provide a template for future MCM development in an alternate species, and support further development of the Göttingen and Sinclair minipig H-ARS models.
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Affiliation(s)
| | | | | | | | | | - Guodong Wu
- Lovelace Biomedical, Albuquerque, NM, USA
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Verma S, Gupta ML, Kumar K. A combined prophylactic modality of podophyllotoxin and rutin alleviates radiation induced injuries to the lymphohematopoietic system of mice by modulating cytokines, cell cycle progression, and apoptosis. Free Radic Res 2020; 54:497-516. [PMID: 32746646 DOI: 10.1080/10715762.2020.1805447] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The present study was conceptualized to delineate radioprotective efficacy of a formulation G-003M (a combination of podophyllotoxin and rutin) against radiation-induced damage to the lymphohematopoietic system of mice. C57BL/6J mice, treated with G-003M 1 h prior to 9 Gy lethal dose, were assessed for reactive oxygen species (ROS)/nitric oxide (NO) generation, antioxidant alterations, Annexin V/PI and TUNEL staining for apoptosis, modulation of apoptotic proteins, cell proliferation, histological alterations in thymus and cell cycle arrest in bone marrow cells. Induction of granulocyte colony-stimulating factor (G-CSF), granulocytes macrophage colony-stimulating factor (GM-CSF), interleukin-IL-6, IL-10, IL-1α, and IL-1β in response to G-003M was also evaluated in different groups of mice. Haematopoietic reconstitution with G-003M was explored by examining endogenous spleen colony-forming units (CFU-S) in irradiated animals. G-003M significantly inhibited ROS/NO, malondialdehyde (MDA) and restored cellular antioxidant glutathione in the thymus of irradiated animals. G-003M pre-treatment significantly (p < 0.001) restrained apoptosis in thymocytes via upregulation of Bcl2 and down-regulation of Bax, p53 and caspase-3. Stimulation of cell proliferation and inhibition of apoptosis by G-003M, restored architecture of thymus in irradiated animals within 30 days as evaluated by histological analysis. G-003M arrested cells at the G2/M phase by inducing reversible cell cycle arrest. Peak expression of G-CSF (45-fold) and IL-6 (60-fold) as well as moderate induction of GM-CSF, IL-10, IL-1α by G-003M helped in haematopoietic recovery of irradiated mice. A higher number of endogenous CFU-S in G-003M pre-treated irradiated mice suggested haematopoietic recovery. Data obtained from the current study affirms that G-003M can be proved as a potential radioprotective agent against radiation damage.
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Affiliation(s)
- Savita Verma
- Division of Radiation Biosciences, Institute of Nuclear Medicine and Allied Sciences (INMAS), DRDO, Delhi, India
| | - Manju Lata Gupta
- Division of Radioprotective Drug Development Research, Institute of Nuclear Medicine and Allied Sciences (INMAS), DRDO, Delhi, India
| | - Kamal Kumar
- Division of Radiation Biosciences, Institute of Nuclear Medicine and Allied Sciences (INMAS), DRDO, Delhi, India
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Repurposing Drugs for Cancer Radiotherapy: Early Successes and Emerging Opportunities. ACTA ACUST UNITED AC 2020; 25:106-115. [PMID: 30896532 DOI: 10.1097/ppo.0000000000000369] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
It has long been recognized that combining radiotherapy with cytotoxic drugs such as cisplatin can improve efficacy. However, while concurrent chemoradiotherapy improves patient outcomes, it comes at costs of increased toxicity. A tremendous opportunity remains to investigate drug combinations in the clinical setting that might increase the benefits of radiation without additional toxicity. This chapter highlights opportunities to apply repurposing of drugs along with a mechanistic understanding of radiation effects on cancer and normal tissue to discover new therapy-modifying drugs and help rapidly translate them to the clinic. We survey candidate radiosensitizers that alter DNA repair, decrease hypoxia, block tumor survival signaling, modify tumor metabolism, block growth factor signaling, slow tumor invasiveness, impair angiogenesis, or stimulate antitumor immunity. Promising agents include widely used drugs such as aspirin, metformin, and statins, offering the potential to improve outcomes, decrease radiation doses, and lower costs. Many other candidate drugs are also discussed.
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Rosen E, Fatanmi OO, Wise SY, Rao VA, Singh VK. Tocol Prophylaxis for Total-body Irradiation: A Proteomic Analysis in Murine Model. HEALTH PHYSICS 2020; 119:12-20. [PMID: 32205715 DOI: 10.1097/hp.0000000000001221] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The aim of this study was to analyze the changes in mouse jejunum protein expression in response to prophylactic administration of two promising tocols, γ-tocotrienol (GT3) and α-tocopherol succinate (TS), as radiation countermeasures before irradiation to elucidate the molecular mechanism(s) of their radioprotective efficacy. Mice were administered GT3 or TS (200 mg kg) subcutaneously 24 h prior to exposure to 11 Gy Co γ-radiation, a supralethal dose for mice. Jejunum was harvested 24 h post-irradiation. Results of the two-dimensional differential in-gel electrophoresis (2D-DIGE), coupled with mass spectrometry, and advanced bioinformatics tools suggest that the tocols have a corresponding impact on expression of 13 proteins as identified by mass spectrometry. Ingenuity Pathway Analysis (IPA) reveals a network of associated proteins involved in inflammatory response, organismal injury and abnormalities, and cellular development. Relevant signaling pathways including actin cytoskeleton signaling, RhoA signaling, and Rho family GTPase were identified. This study reveals the major proteins, pathways, and networks involved in preventing the radiation-induced injury in gut that may be contributing to enhanced survival.
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Affiliation(s)
- Elliot Rosen
- Division of Biotechnology Research and Review III, Office of Biotechnology Products, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD
| | | | | | - V Ashutosh Rao
- Division of Biotechnology Research and Review III, Office of Biotechnology Products, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD
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Landauer MR, Harvey AJ, Kaytor MD, Day RM. Mechanism and therapeutic window of a genistein nanosuspension to protect against hematopoietic-acute radiation syndrome. JOURNAL OF RADIATION RESEARCH 2019; 60:308-317. [PMID: 31038675 PMCID: PMC6530628 DOI: 10.1093/jrr/rrz014] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Revised: 03/08/2019] [Indexed: 05/17/2023]
Abstract
There are no FDA-approved drugs that can be administered prior to ionizing radiation exposure to prevent hematopoietic-acute radiation syndrome (H-ARS). A suspension of synthetic genistein nanoparticles was previously shown to be an effective radioprotectant against H-ARS when administered prior to exposure to a lethal dose of total body radiation. Here we aimed to determine the time to protection and the duration of protection when the genistein nanosuspension was administered by intramuscular injection, and we also investigated the drug's mechanism of action. A single intramuscular injection of the genistein nanosuspension was an effective radioprotectant when given prophylactically 48 h to 12 h before irradiation, with maximum effectiveness occurring when administered 24 h before. No survival advantage was observed in animals administered only a single dose of drug after irradiation. The dose reduction factor of the genistein nanosuspension was determined by comparing the survival of treated and untreated animals following different doses of total body irradiation. As genistein is a selective estrogen receptor beta agonist, we also explored whether this was a central component of its radioprotective mechanism of action. Mice that received an intramuscular injection of an estrogen receptor antagonist (ICI 182,780) prior to administration of the genistein nanosuspension had significantly lower survival following total body irradiation compared with animals only receiving the nanosuspension (P < 0.01). These data define the time to and duration of radioprotection following a single intramuscular injection of the genistein nanosuspension and identify its likely mechanism of action.
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Affiliation(s)
- Michael R Landauer
- Armed Forces Radiobiology Research Institute, Uniformed Services University of the Health Sciences, 4555 South Palmer Road, Building 42, Bethesda, MD, USA
| | - Adam J Harvey
- Humanetics Corporation, 7650 Edinborough Way, Suite 620, Edina, MN, USA
| | - Michael D Kaytor
- Humanetics Corporation, 7650 Edinborough Way, Suite 620, Edina, MN, USA
| | - Regina M Day
- Department of Pharmacology and Molecular Therapeutics, Uniformed Services University of the Health Sciences, Building C, Roomm 2023, 4301 Jones Bridge Road, Bethesda, MD, USA
- Corresponding author. Department of Pharmacology and Molecular Therapeutics, Uniformed Services University of the Health Sciences, Building C, Room 2023, 4301 Jones Bridge Road, Bethesda, MD 20814-4799, USA. Tel: +301-295-3236; fax: +301-295-3220;
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Schaue D, McBride WH. Are animal models a necessity for acute radiation syndrome drug discovery? Expert Opin Drug Discov 2019; 14:511-515. [PMID: 30870041 DOI: 10.1080/17460441.2019.1591364] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Dörthe Schaue
- a Department Radiation Oncology , University of California at Los Angeles , Los Angeles , CA , USA
| | - William H McBride
- a Department Radiation Oncology , University of California at Los Angeles , Los Angeles , CA , USA
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Haritwal T, Maan K, Rana P, Parvez S, Singh AK, Khushu S, Agrawala PK. Trichostatin A, an epigenetic modifier, mitigates radiation-induced androphysiological anomalies and metabolite changes in mice as evident from NMR-based metabolomics. Int J Radiat Biol 2018; 95:443-451. [PMID: 30307353 DOI: 10.1080/09553002.2018.1524989] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
PURPOSE Ionizing radiation is known to damage male reproductive system. Current study aims to study the mitigative effects of trichostatin A on male reproductive system and accompanying metabolite changes in testicular tissue of mice. MATERIALS AND METHODS Eight-week-old male C57 Bl/6J mice were exposed to 2 Gy γ-radiation with or without trichostatin A administration. The animals were sacrificed at various time intervals for organ body weight index, sperm head abnormality assay, sperm mobility assay, and study of various metabolites in testicular tissue using NMR spectroscopy. RESULTS Ionizing radiation induced no significant change in organ body weight index at any time points studied, however a significant increase in sperm head abnormality and significant decrease in sperm mobility was evident on fifth postirradiation week. trichostatin A administration, 1 and 24 h postirradiation, could efficiently mitigate radiation-induced changes studied. NMR metabolome profile also showed prominent changes associated with energy metabolism, osmolytes and membrane metabolism at 24 h postirradiation and some of these changes (choline, glycerolphosphoethanol amine, and glycine) were persistent till fifth postirradiation week. Trichostatin A administration resulted in reverting metabolic profile of the irradiated animals to normal level suggesting its mitigative role. CONCLUSION Results obtained suggest that trichostatin A could restore normal metabolic profile of testicular tissue of irradiated male mice and also restored certain morphological and functional properties of sperms. Trichostatin A thus could further be exploited for its radio-mitigative properties.
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Affiliation(s)
- Teena Haritwal
- a Department of Radiation Genetics and Epigenetics , Institute for Nuclear Medicine and Allied Sciences , Delhi , India
| | - Kiran Maan
- b NMR Research Centre, Institute for Nuclear Medicine and Allied Sciences , Delhi , India
| | - Poonam Rana
- b NMR Research Centre, Institute for Nuclear Medicine and Allied Sciences , Delhi , India
| | - Suhel Parvez
- c Department of Toxicology , Jamia Hamdard University , New Delhi , India
| | - Ajay K Singh
- a Department of Radiation Genetics and Epigenetics , Institute for Nuclear Medicine and Allied Sciences , Delhi , India
| | - Subash Khushu
- b NMR Research Centre, Institute for Nuclear Medicine and Allied Sciences , Delhi , India
| | - Paban K Agrawala
- a Department of Radiation Genetics and Epigenetics , Institute for Nuclear Medicine and Allied Sciences , Delhi , India
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