Aberrant immunostaining pattern of the CD24 glycoprotein in clinical samples and experimental models of pediatric medulloblastomas

Emma Sandén, Cecilia Dyberg, Cecilia Krona, Edward Visse, Helena Carén, Paul A. Northcott, Marcel Kool, Nils Ståhl, Annette Persson, Elisabet Englund, John I. Johnsen, Peter Siesjö, Anna Darabi

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The CD24 glycoprotein is a mediator of neuronal proliferation, differentiation and immune suppression in the normal CNS, and a proposed cancer biomarker in multiple peripheral tumor types. We performed a comparative analysis of CD24 gene expression in a large cohort of pediatric and adult brain tumors (n = 813), and further characterized protein expression in tissue sections (n = 39), primary brain tumor cultures (n = 12) and a novel orthotopic group 3 medulloblastoma xenograft model. Increased CD24 gene expression was demonstrated in ependymomas, medulloblastomas, anaplastic astrocytomas and glioblastomas, although medulloblastomas displayed higher expression than all other tumor entities. Preferential expression of CD24 in medulloblastomas was confirmed at protein level by immunostaining and computerized image analysis of cryosections. Morphologies and immunophenotyping of CD24+ cells in tissue sections tentatively suggested disparate functions in different tumor subsets. Notably, protein staining of medulloblastoma cells was associated with prominent cytoplasmic and membranous granules, enabling rapid and robust identification of medulloblastoma cells in clinical tissue samples, as well as in experimental model systems. In conclusion, our results implicate CD24 as a clinically and experimentally useful medulloblastoma immunomarker. Although our results encourage further functional studies of CD24 as a potential molecular target in subsets of brain tumors, the promiscuous expression of CD24 in vivo highlights the importance of specificity in the future design of such targeted treatment.

Original languageEnglish
Pages (from-to)1-13
Number of pages13
JournalJournal of Neuro-Oncology
Volume123
Issue number1
DOIs
Publication statusPublished - 26 May 2015
Externally publishedYes

Keywords

  • CD24
  • Glycoprotein
  • Medulloblastoma immunomarker
  • Molecular target
  • Orthotopic group 3 medulloblastoma model
  • Pediatric brain tumor

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