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BRAFV600E-mutation is invariably present and associated to oncogene-induced senescence in Erdheim-Chester disease
  1. Maria Giulia Cangi1,
  2. Riccardo Biavasco2,
  3. Giulio Cavalli2,3,
  4. Greta Grassini1,
  5. Elena Dal-Cin1,
  6. Corrado Campochiaro2,3,
  7. Barbara Guglielmi3,
  8. Alvise Berti2,3,
  9. Vito Lampasona4,
  10. Andreas von Deimling5,
  11. Maria Grazia Sabbadini2,3,
  12. Marina Ferrarini6,
  13. Claudio Doglioni1,2,
  14. Lorenzo Dagna2,3
  1. 1Unit of Pathology, IRCCS San Raffaele Scientific Institute, Milan, Italy
  2. 2Vita-Salute San Raffaele University, Milan, Italy
  3. 3Unit of Medicine and Clinical Immunology, IRCCS San Raffaele Scientific Institute, Milan, Italy
  4. 4Center for Translational Genomics and Bioinformatics, IRCCS San Raffaele Scientific Institute, Milan, Italy
  5. 5Department of Neuropathology, Heidelberg University, and CCU Neuropathology, DKFZ, Heidelberg, Germany
  6. 6Unit of Biology of Myeloma, IRCCS San Raffaele Scientific Institute, Milan, Italy
  1. Correspondence to Professor Lorenzo Dagna, Unit of Medicine and Clinical Immunology, San Raffaele Scientific Institute, Via Olgettina 60, Milan 20132, Italy; lorenzo.dagna{at}unisr.it

Abstract

Objectives Erdheim-Chester disease (ECD) is a rare form of histiocytosis characterised by uncontrolled chronic inflammation. The oncogenic BRAFV600E mutation has been reported in biopsies in 19 out of 37 patients with ECD from the largest published cohort, but never found in the patients’ peripheral blood. Also, the role of the mutation in the pathogenesis of the disease has not been elucidated yet. BRAFV600E has been associated with oncogene-induced senescence (OIS), a protective mechanism against oncogenic events, characterised by the induction of proinflammatory pathways.

Methods We verified the BRAF status in biopsies and peripheral blood from 18 patients with ECD from our cohort and matched controls by means of immunohistochemistry and of an ultrasensitive assay, based on the combination of a locked nucleic acid PCR and pyrosequencing. Droplet digital PCR was used to confirm the findings. We also evaluated the presence of senescence markers in ECD histiocytes.

Results BRAFV600E mutation was present in all the biopsy and peripheral blood samples from patients with ECD and in none of the controls. ECD histiocytes and a fraction of circulating monocytes from patients with ECD showed signs of a constitutive activation of the MAPK pathway. Moreover, BRAF-mutated histiocytes expressed markers of OIS.

Conclusions The oncogenic BRAFV600E mutation is present in biopsies and in the peripheral blood from all patients with ECD who were evaluated and is associated with OIS. These findings have significant implications for the pathogenesis, diagnosis and treatment of ECD.

  • Inflammation
  • Cytokines
  • Gene Polymorphism

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