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  • 1.
    Fallah, Mahsa
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
    Shen, Yue
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
    Brodén, Jessica
    Bäckman, Assar
    Lundskog, Bertil
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Johansson, Mikael
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology.
    Blomqvist, Michael
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics.
    Liu, Kui
    Wilczynska, Malgorzata
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
    Ny, Tor
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
    Plasminogen activation is required for the development of radiation-induced dermatitis2018In: Cell Death and Disease, E-ISSN 2041-4889, Vol. 9, no 11, article id 1051Article in journal (Refereed)
    Abstract [en]

    Skin damage caused by radiation therapy (radiodermatitis) is a severe side effect of radiotherapy in cancer patients, and there is currently a lack of effective strategies to prevent or treat such skin damage. In this work, we show with several lines of evidence that plasminogen, a pro-inflammatory factor, is key for the development of radiodermatitis. After skin irradiation in wild type (plg+/+) mice, the plasminogen level increased in the radiated area, leading to severe skin damage such as ulcer formation. However, plasminogen-deficient (plg−/−) mice and mice lacking plasminogen activators were mostly resistant to radiodermatitis. Moreover, treatment with a plasminogen inhibitor, tranexamic acid, decreased radiodermatitis in plg+/+ mice and prevented radiodermatitis in plg+/ mice. Together with studies at the molecular level, we report that plasmin is required for the induction of inflammation after irradiation that leads to radiodermatitis, and we propose that inhibition of plasminogen activation can be a novel treatment strategy to reduce and prevent the occurrence of radiodermatitis in patients.

     

     

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  • 2.
    Fallah, Mahsa
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
    Viklund, Emil
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
    Bäckman, Assar
    Brodén, Jessica
    Lundskog, Bertil
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Johansson, Mikael
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Oncology.
    Blomqvist, Michael
    Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics.
    Wilczynska, Malgorzata
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics. Omnio AB, Umeå, Sweden.
    Ny, Tor
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
    Plasminogen is a master regulator and a potential drug candidate for the healing of radiation wounds2020In: Cell Death and Disease, E-ISSN 2041-4889, Vol. 11, no 3Article in journal (Refereed)
    Abstract [en]

    Around 95% of cancer patients undergoing radiotherapy experience cutaneous side effects, and some develop radiation wounds or fibrosis. Currently, there is no effective treatment for these indications. We show here that plasminogen administration enhanced the healing of radiation wounds via pleiotropic effects on gene expression. Using RNA sequencing, we found that plasminogen downregulated the expression of genes in the TLR, TNF, WNT, MAPK, and TGF-β signaling pathways, and enhanced the anti-inflammatory effect of arachidonic acid, leading to significantly decreased inflammation and improved remodeling of granulation tissue compared with placebo treatment. In addition, plasminogen induced metabolic changes, including decreased glycolysis. Importantly, many of the factors downregulated by plasminogen are pro-fibrotic. Therefore, in radiation wounds with excessive inflammation, plasminogen is able to enhance and redirect the healing process, such that it more closely resembles physiological healing with significantly reduced risk for developing fibrosis. This makes plasminogen an attractive drug candidate for the treatment of radiation wounds in cancer patients.

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    fulltext
  • 3.
    Fallah, Mahsa
    et al.
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
    Viklund, Emil
    Shen, Yue
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
    Bäckman, Assar
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
    Lundskog, Bertil
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Pathology.
    Johansson, Mikael
    Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Blomqvist, Michael
    Umeå University, Faculty of Medicine, Department of Radiation Sciences.
    Liu, Kui
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
    Wilczynska, Malgorzata
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
    Ny, Tor
    Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
    Plasminogen enhances the healing of radiation-induced wounds via decreased expression of pro-inflammatory and pro-fibrotic factorsManuscript (preprint) (Other academic)
1 - 3 of 3
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