Early rhombic lip Protogenin+ve stem cells in a human-specific neurovascular niche initiate and maintain group 3 medulloblastoma

Cell. 2024 Aug 22;187(17):4733-4750.e26. doi: 10.1016/j.cell.2024.06.011. Epub 2024 Jul 5.

Abstract

We identify a population of Protogenin-positive (PRTG+ve) MYChigh NESTINlow stem cells in the four-week-old human embryonic hindbrain that subsequently localizes to the ventricular zone of the rhombic lip (RLVZ). Oncogenic transformation of early Prtg+ve rhombic lip stem cells initiates group 3 medulloblastoma (Gr3-MB)-like tumors. PRTG+ve stem cells grow adjacent to a human-specific interposed vascular plexus in the RLVZ, a phenotype that is recapitulated in Gr3-MB but not in other types of medulloblastoma. Co-culture of Gr3-MB with endothelial cells promotes tumor stem cell growth, with the endothelial cells adopting an immature phenotype. Targeting the PRTGhigh compartment of Gr3-MB in vivo using either the diphtheria toxin system or chimeric antigen receptor T cells constitutes effective therapy. Human Gr3-MBs likely arise from early embryonic RLVZ PRTG+ve stem cells inhabiting a specific perivascular niche. Targeting the PRTGhigh compartment and/or the perivascular niche represents an approach to treat children with Gr3-MB.

Keywords: brain development; brain tumor immunotherapy; cancer genomics; group 3 medulloblastoma; perivascular niche; rhombic lip.

MeSH terms

  • Animals
  • Cerebellar Neoplasms / metabolism
  • Cerebellar Neoplasms / pathology
  • Coculture Techniques
  • Embryonic Structures
  • Endothelial Cells / metabolism
  • Humans
  • Medulloblastoma* / metabolism
  • Medulloblastoma* / pathology
  • Metencephalon / embryology
  • Mice
  • Neoplastic Stem Cells* / metabolism
  • Neoplastic Stem Cells* / pathology
  • Rhombencephalon / embryology
  • Rhombencephalon / metabolism
  • Stem Cell Niche
  • Stem Cells / metabolism

Supplementary concepts

  • rhombic lip