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Takahashi T, Watkins B, Bratrude B, Neuberg D, Hebert K, Betz K, Yu A, Choi SW, Davis J, Duncan C, Giller R, Grimley M, Harris AC, Jacobsohn D, Lalefar N, Farhadfar N, Pulsipher MA, Shenoy S, Petrovic A, Schultz KR, Yanik GA, Blazar BR, Horan JT, Langston A, Kean LS, Qayed M. The Adverse Event Landscape of Stem Cell Transplant: Evidence for aGVHD Driving Early Transplant Associated Toxicities. Transplant Cell Ther 2024:S2666-6367(24)00317-8. [PMID: 38583802 DOI: 10.1016/j.jtct.2024.03.030] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Revised: 03/26/2024] [Accepted: 03/30/2024] [Indexed: 04/09/2024]
Abstract
Although unrelated-donor (URD) hematopoietic cell transplantation (HCT) is associated with many toxicities, a detailed analysis of adverse events, as defined by the Common Terminology Criteria for Adverse Events (CTCAE), has not previously been curated. This represents a major unmet need, especially as it relates to assessing the safety of novel agents. We analyzed a detailed AE database from the "ABA2" randomized, double-blind, placebo-controlled clinical trial of abatacept for acute graft-versus-host disease (aGVHD) prevention, for which the FDA mandated a detailed AE assessment through Day +180, and weekly neutrophil and platelet counts through Day +100. These were analyzed for their relationship to key transplant outcomes, with a major focus on the impact of aGVHD on the development/severity of AEs. A total of 2102 AEs and 1816 neutrophil/platelet counts were analyzed from 142 8/8-HLA-matched URD HCT recipients on ABA2 (placebo cohort, n = 69, abatacept cohort, n = 73). This analysis resulted in 2 major observations. (1) Among graft source, conditioning intensity, age, and Grade 2 to 4 aGVHD, only aGVHD impacted Grade 3 to 5 AE acquisition after the first month post-transplant. (2) The development of Grade 3 to 4 aGVHD was associated with thrombocytopenia. We have created a detailed resource for the transplant community by which to contextualize clinical toxicities after transplant. It has identified aGVHD as a major driver of post-HCT Grade 3 to 5 AEs, and underscored a link between aGVHD and thrombocytopenia. This establishes a critical safety framework upon which the impact of novel post-transplant aGVHD therapeutics should be evaluated. This trial was registered at www.clinicaltrials.gov (#NCT01743131).
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Affiliation(s)
- Takuto Takahashi
- Boston Children's Hospital, Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Benjamin Watkins
- Aflac Cancer and Blood Disorders Center, Children's Healthcare of Atlanta, and Emory University, Atlanta, Georgia
| | - Brandi Bratrude
- Boston Children's Hospital, Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Donna Neuberg
- Boston Children's Hospital, Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Kyle Hebert
- Boston Children's Hospital, Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Kayla Betz
- Boston Children's Hospital, Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Alison Yu
- Boston Children's Hospital, Dana-Farber Cancer Institute, Boston, Massachusetts
| | | | - Jeffrey Davis
- BC Children's Hospital, University of British Columbia, Vancouver, British Columbia, Canada
| | - Christine Duncan
- Boston Children's Hospital, Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Roger Giller
- Center for Cancer and Blood Disorders, Children Hospital of Colorado, University of Colorado, Aurora, Colorado
| | - Michael Grimley
- University of Cincinnati College of Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Andrew C Harris
- Memorial Sloan Kettering Cancer Center, New York City, New York
| | - David Jacobsohn
- Children's National Health System, Washington, District of Columbia
| | - Nahal Lalefar
- University of California San Francisco, UCSF Benioff Children's Hospital Oakland, Oakland, California
| | | | - Michael A Pulsipher
- Spencer Fox Eccles School of Medicine at the University of Utah, Intermountain Primary Children's Hospital, Salt Lake City, Utah
| | - Shalini Shenoy
- Washington University School of Medicine, St Louis, Missouri
| | - Aleksandra Petrovic
- Seattle Children's Hospital and Fred Hutch Cancer Center, Seattle, Washington
| | - Kirk R Schultz
- BC Children's Hospital, University of British Columbia, Vancouver, British Columbia, Canada
| | | | - Bruce R Blazar
- Division of Blood and Marrow Transplantation, Department of Pediatrics, University of Minnesota, Minneapolis, Minnesota
| | - John T Horan
- Boston Children's Hospital, Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Amelia Langston
- Winship Cancer Institute, Emory University, Atlanta, Georgia
| | - Leslie S Kean
- Boston Children's Hospital, Dana-Farber Cancer Institute, Boston, Massachusetts.
| | - Muna Qayed
- Aflac Cancer and Blood Disorders Center, Children's Healthcare of Atlanta, and Emory University, Atlanta, Georgia
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Moon J, Park CH, Son SH, Youn JH, Kim SK. Endogenous level of abscisic acid down-regulated by brassinosteroids signaling via BZR1 to control the growth of Arabidopsis thaliana. Plant Signal Behav 2021; 16:1926130. [PMID: 33980131 PMCID: PMC8281058 DOI: 10.1080/15592324.2021.1926130] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 04/30/2021] [Accepted: 04/30/2021] [Indexed: 06/12/2023]
Abstract
The increased level of endogenous abscisic acid (ABA) in brassinosteroid (BR)-deficient mutants, such as det2 and cyp85a1 × cyp85a2, suggests that ABA synthesis is inhibited by endogenous BRs in Arabidopsis thaliana. Expression of the ABA biosynthesis gene ABA-deficient 2 (ABA2) was negatively regulated by exogenously applied BR but up-regulated by the application of brassinazole and in det2 and cyp85a1 × cyp85a2. In addition, ABA2 expression decreased in bzr1-1D, showing that ABA biosynthesis is inhibited by BR signaling via BZR1, intermediated by ABA2, in Arabidopsis. Four cis-element sequences (E-boxes 1-4) in the putative promoter region of ABA2 were identified as BZR1 binding sites. The electrophoretic mobility shift assay and chromatin immune precipitation analysis demonstrated that BZR1 directly binds to overlapped E-boxes (E-box 3/4) in the promoter region of ABA2. The level of endogenous ABA was decreased in bzr1-1D compared to wild-type, indicating that binding of BZR1 to the ABA2 promoter inhibits ABA synthesis in Arabidopsis. Compared to wild-type, aba2-1 exhibited severely reduced growth and development. The abnormalities in aba2-1 were rescued by the application of ABA, suggesting that ABA2 expression and ABA synthesis are necessary for the normal growth and development of A. thaliana. Finally, bzr1-KO × aba2-1 exhibited inhibitory growth of primary roots compared to bzr1-KO, verifying that ABA2 is a downstream target of BZR1 in the plant. Taken together, the level of endogenous ABA is down-regulated by BR signaling via BZR1, controlling the growth of A. thaliana.
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Affiliation(s)
- Jinyoung Moon
- Department of Life Science, Chung-Ang University, Seoul, Republic of Korea
| | - Chan-Ho Park
- Department of Plant Biology, Carnegie Institution for Science, Standford, USA
| | - Seung-Hyun Son
- Department of Life Science, Chung-Ang University, Seoul, Republic of Korea
| | - Ji-Hyun Youn
- Department of Life Science, Chung-Ang University, Seoul, Republic of Korea
| | - Seong-Ki Kim
- Department of Life Science, Chung-Ang University, Seoul, Republic of Korea
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Fu J, Zhang X, Liu J, Gao X, Bai J, Hao Y, Cui H. A mechanism coordinating root elongation, endodermal differentiation, redox homeostasis and stress response. Plant J 2021; 107:1029-1039. [PMID: 34056773 DOI: 10.1111/tpj.15361] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Revised: 05/21/2021] [Accepted: 05/25/2021] [Indexed: 06/12/2023]
Abstract
Root growth relies on both cell division and cell elongation, which occur in the meristem and elongation zones, respectively. SCARECROW (SCR) and SHORT-ROOT (SHR) are GRAS family genes essential for root growth and radial patterning in the Arabidopsis root. Previous studies showed that SCR and SHR promote root growth by suppressing cytokinin response in the meristem, but there is evidence that SCR expressed beyond the meristem is also required for root growth. Here we report a previously unknown role for SCR in promoting cell elongation. Consistent with this, we found that the scr mutant accumulated a higher level of reactive oxygen species (ROS) in the elongation zone, which is probably due to decreased expression of peroxidase gene 3, which consumes hydrogen peroxide in a reaction leading to Casparian strip formation. When the oxidative stress response was blocked in the scr mutant by mutation in ABSCISIC ACID 2 (ABA2) or when the redox status was ameliorated by the upbeat 1 (upb1) mutant, the root became significantly longer, with longer cells and a larger and more mitotically active meristem. Remarkably, however, the stem cell and radial patterning defects in the double mutants still persisted. Since ROS and peroxidases are essential for endodermal differentiation, these results suggest that SCR plays a role in coordinating cell elongation, endodermal differentiation, redox homeostasis and oxidative stress response in the root. We also provide evidence that this role of SCR is independent of SHR, even though they function similarly in other aspects of root growth and development.
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Affiliation(s)
- Jing Fu
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Xinglin Zhang
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Jiaming Liu
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Xudong Gao
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Juan Bai
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Yueling Hao
- Department of Biological Science, Florida State University, Tallahassee, FL, 32306, USA
| | - Hongchang Cui
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China
- Department of Biological Science, Florida State University, Tallahassee, FL, 32306, USA
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Linden KJ, Hsia MM, Chen YT, Callis J. The Arabidopsis thaliana E3 Ubiquitin Ligase BRIZ Functions in Abscisic Acid Response. Front Plant Sci 2021; 12:641849. [PMID: 33796126 PMCID: PMC8008127 DOI: 10.3389/fpls.2021.641849] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 02/10/2021] [Indexed: 05/04/2023]
Abstract
The ubiquitin system is essential for multiple hormone signaling pathways in plants. Here, we show that the Arabidopsis thaliana E3 ligase BRIZ, a heteromeric ligase that consists minimally of BRIZ1 and BRIZ2 proteins, functions in abscisic acid (ABA) signaling or response. briz1 and briz2 homozygous mutants either fail to germinate or emerge later than wild-type seedlings, with little cotyledon expansion or root elongation and no visible greening. Viability staining indicates that briz1 and briz2 embryos are alive but growth-arrested. Germination of briz mutants is improved by addition of the carotenoid biosynthetic inhibitor fluridone or gibberellic acid (GA3), and briz mutants have improved development in backgrounds deficient in ABA synthesis (gin1-3/aba2) or signaling (abi5-7). Endogenous ABA is not higher in briz2 seeds compared to wild-type seeds, and exogenous ABA does not affect BRIZ mRNAs in imbibed seeds. These results indicate that briz embryos are hypersensitive to ABA and that under normal growth conditions, BRIZ acts to suppress ABA signaling or response. ABA signaling and sugar signaling are linked, and we found that briz1 and briz2 mutants excised from seed coats are hypersensitive to sucrose. Although briz single mutants do not grow to maturity, we were able to generate mature briz2-3 abi5-7 double mutant plants that produced seeds. These seeds are more sensitive to exogenous sugar and are larger than seeds from sibling abi5-7 BRIZ2/briz2-3 plants, suggesting that BRIZ has a parental effect on seed development. From these data, we propose a model in which the BRIZ E3 ligase suppresses ABA responses during seed maturation and germination and early seedling establishment.
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Affiliation(s)
- Katrina J. Linden
- Department of Molecular and Cellular Biology, University of California, Davis, Davis, CA, United States
- Integrated Genetics and Genomics Graduate Program, University of California, Davis, Davis, CA, United States
| | - Mon Mandy Hsia
- Department of Molecular and Cellular Biology, University of California, Davis, Davis, CA, United States
- Biochemistry and Molecular Biology Graduate Program, University of California, Davis, Davis, CA, United States
| | - Yi-Tze Chen
- Department of Molecular and Cellular Biology, University of California, Davis, Davis, CA, United States
- Plant Biology Graduate Program, University of California, Davis, Davis, CA, United States
| | - Judy Callis
- Department of Molecular and Cellular Biology, University of California, Davis, Davis, CA, United States
- Integrated Genetics and Genomics Graduate Program, University of California, Davis, Davis, CA, United States
- Biochemistry and Molecular Biology Graduate Program, University of California, Davis, Davis, CA, United States
- Plant Biology Graduate Program, University of California, Davis, Davis, CA, United States
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5
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Lozano-Juste J, Masi M, Cimmino A, Clement S, Fernández MA, Antoni R, Meyer S, Rodriguez PL, Evidente A. The fungal sesquiterpenoid pyrenophoric acid B uses the plant ABA biosynthetic pathway to inhibit seed germination. J Exp Bot 2019; 70:5487-5494. [PMID: 31257433 PMCID: PMC6793445 DOI: 10.1093/jxb/erz306] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Accepted: 06/17/2019] [Indexed: 05/12/2023]
Abstract
Pyrenophoric acid (P-Acid), P-Acid B, and P-Acid C are three phytotoxic sesquiterpenoids produced by the ascomycete seed pathogen Pyrenophora semeniperda, a fungus proposed as a mycoherbicide for biocontrol of cheatgrass, an extremely invasive weed. When tested in cheatgrass bioassays, these metabolites were able to delay seed germination, with P-Acid B being the most active compound. Here, we have investigated the cross-kingdom activity of P-Acid B and its mode of action, and found that it activates the abscisic acid (ABA) signaling pathway in order to inhibit seedling establishment. P-Acid B inhibits seedling establishment in wild-type Arabidopsis thaliana, while several mutants affected in the early perception as well as in downstream ABA signaling components were insensitive to the fungal compound. However, in spite of structural similarities between ABA and P-Acid B, the latter is not able to activate the PYR/PYL family of ABA receptors. Instead, we have found that P-Acid B uses the ABA biosynthesis pathway at the level of alcohol dehydrogenase ABA2 to reduce seedling establishment. We propose that the fungus P. semeniperda manipulates plant ABA biosynthesis as a strategy to reduce seed germination, increasing its ability to cause seed mortality and thereby increase its fitness through higher reproductive success.
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Affiliation(s)
- Jorge Lozano-Juste
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), Consejo Superior de Investigaciones Científicas (CSIC), Universidad Politécnica de Valencia (UPV), Valencia, Spain
- Correspondence: or
| | - Marco Masi
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Universitario Monte Sant’Angelo, Napoli, Italy
| | - Alessio Cimmino
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Universitario Monte Sant’Angelo, Napoli, Italy
| | - Suzette Clement
- Shrub Sciences Laboratory, U.S. Forest Service Rocky Mountain Research Station, Provo, UT, USA
| | - Maria A Fernández
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), Consejo Superior de Investigaciones Científicas (CSIC), Universidad Politécnica de Valencia (UPV), Valencia, Spain
| | - Regina Antoni
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), Consejo Superior de Investigaciones Científicas (CSIC), Universidad Politécnica de Valencia (UPV), Valencia, Spain
| | - Susan Meyer
- Shrub Sciences Laboratory, U.S. Forest Service Rocky Mountain Research Station, Provo, UT, USA
| | - Pedro L Rodriguez
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), Consejo Superior de Investigaciones Científicas (CSIC), Universidad Politécnica de Valencia (UPV), Valencia, Spain
| | - Antonio Evidente
- Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Universitario Monte Sant’Angelo, Napoli, Italy
- Correspondence: or
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