Abstract
Sulforaphane has been investigated in human pathologies and preclinical models of airway diseases. To provide further mechanistic insights, we explored L-sulforaphane (LSF) in the ovalbumin (OVA)-induced chronic allergic airways murine model, with key hallmarks of asthma. Histological analysis indicated that LSF prevented or reversed OVA-induced epithelial thickening, collagen deposition, goblet cell metaplasia, and inflammation. Well-known antioxidant and anti-inflammatory mechanisms contribute to the beneficial effects of LSF. Fourier transform infrared microspectroscopy revealed altered composition of macromolecules, following OVA sensitization, which were restored by LSF. RNA sequencing in human peripheral blood mononuclear cells highlighted the anti-inflammatory signature of LSF. Findings indicated that LSF may alter gene expression via an epigenetic mechanism which involves regulation of protein acetylation status. LSF resulted in histone and α-tubulin hyperacetylation in vivo, and cellular and enzymatic assays indicated decreased expression and modest histone deacetylase (HDAC) inhibition activity, in comparison with the well-known pan-HDAC inhibitor suberoylanilide hydroxamic acid (SAHA). Molecular modeling confirmed interaction of LSF and LSF metabolites with the catalytic domain of metal-dependent HDAC enzymes. More generally, this study confirmed known mechanisms and identified potential epigenetic pathways accounting for the protective effects and provide support for the potential clinical utility of LSF in allergic airways disease.







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RNA sequencing data are available from GEO under the accession GSE160353. To review GEO accession GSE160353 while it remains in private status, go the following address and enter the access token: otmlcuoillwhjcd. https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE160353
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Acknowledgements
We acknowledge the intellectual and financial support from McCord Research (Iowa, USA). The authors would like to acknowledge the use of the facilities provided by Monash University (Clayton, VIC, Australia) and the Murdoch Children’s Research Institute (Parkville, VIC, Australia) for their care and husbandry of the mice. The Gomori’s aldehyde-fuchsin and silver impregnation stains were performed by Ms Laura Leone at the Melbourne University Histology Platform (University of Melbourne, School of Biomedical Sciences, Parkville, VIC, Australia). The authors would like to acknowledge the use of the facilities provided by Monash Micro Imaging (MMI) at the Alfred Research Alliance (ARA, Melbourne, VIC, Australia) and, particularly, the expert assistance from Drs Stephen Cody and Iśka Carmichael. FPA-FTIR imaging measurements were undertaken at the IRM beamline at the Australian Synchrotron, part of ANSTO (Clayton, VIC, Australia). Various figures in this manuscript were created with BioRender.com. We thank the National Computing Infrastructure (NCI), and the Pawsey Supercomputing Centre in Australia (funded by the Australian Government). Further, we thank the Spartan High Performance Computing service (University of Melbourne), and the Partnership for Advanced Computing in Europe (PRACE) for awarding the access to Piz Daint, hosted at the Swiss National Supercomputing Centre (CSCS), Switzerland. We acknowledge our use of the gene set enrichment analysis, GSEA software, and Molecular Signature Database (MSigDB) (Subramanian, Tamayo, et al. (2005), PNAS 102, 15545-15550, http://www.broad.mit.edu/gsea/).
Funding
We would like to acknowledge intellectual and financial support by McCord Research (Iowa, USA). AEO is supported by an National Health and Medical Research Council (NHMRC) Senior Research Fellowship (1154650). PVL is supported by an NHMRC Career Development Fellowship (1146198). CD is supported by an NHMRC Early Career Postdoctoral Fellowship (1120152). JJL is supported by an Australian Government Research Training Program Scholarship.
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SGR, JEB, AH, PVL, CSS, KJS, MLKT, AE, and TCK conceptualized the ideas and overarching aims. JEB, AH, PVL, CSS, KJS, MJT, JV, MLKT, AE, and TCK were involved in supervision. KV, CD, AH, IK, JJL, SM, NM, EP, MJT, JV, and MZ participated in the development and design of the methodology. KV, CD, IK, SM, NM, MJT, JV, and MZ conducted the research and investigation process. RCB, AH, JJL, EP, YYS, and MZ were responsible for visualization and KV, EP, SGR, PVL, and TCK were involved in production of the first draft of the manuscript.
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Epigenomic Medicine Program (TCK) was supported financially by McCord Research (Iowa, USA), which has a financial interest in dietary compounds including sulforaphane. The remaining co-authors declare that they have no direct financial relation with the commercial identities mentioned in this manuscript that might lead to a conflict of interest.
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This study was performed in line with the principles of the Declaration of Helsinki. Six-week-old female BALB/c mice were obtained from Walter and Eliza Hall Institute Bioservices (prevention model; Parkville, VIC, Australia) and Monash Animal Services (reversal model; Clayton, VIC, Australia). The prevention model experimental protocol was approved by the Murdoch Children’s Research Institute Animal Ethics Committee (approval no. A597). The reversal model experimental protocol was approved by the Monash University Animal Ethics Committee (MARP/2012/085). All experimental procedures followed the Australian guidelines for the care and use of laboratory animals for scientific purposes. Human peripheral blood mononuclear cells (PBMC) were fractionated using Ficoll Paque (GE Healthcare, Wauwatosa, Wisconsin, USA) from blood samples (healthy participants; n = 4) obtained from the Australian Red Cross Blood Bank (Melbourne, VIC, Australia) under ethics project (#304/12) approved by the Alfred Hospital Ethics Committee (Alfred Health, Melbourne, VIC, Australia). Human epithelial lung A549 cells were purchased from the American Type Culture Collection (ATCC, Manassas, VA, USA).
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Royce, S.G., Licciardi, P.V., Beh, R.C. et al. Sulforaphane prevents and reverses allergic airways disease in mice via anti-inflammatory, antioxidant, and epigenetic mechanisms. Cell. Mol. Life Sci. 79, 579 (2022). https://doi.org/10.1007/s00018-022-04609-3
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DOI: https://doi.org/10.1007/s00018-022-04609-3