SerpinB3 drives cancer stem cell survival in glioblastoma

Adam Lauko, Josephine Volovetz, Soumya M. Turaga, Defne Bayik, Daniel J. Silver, Kelly Mitchell, Erin E. Mulkearns-Hubert, Dionysios C. Watson, Kiran Desai, Manav Midha, Jing Hao, Kathleen McCortney, Alicia Steffens, Ulhas Naik, Manmeet S. Ahluwalia, Shideng Bao, Craig Horbinski, Jennifer S. Yu, Justin D. Lathia*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Despite therapeutic interventions for glioblastoma (GBM), cancer stem cells (CSCs) drive recurrence. The precise mechanisms underlying CSC resistance, namely inhibition of cell death, are unclear. We built on previous observations that the high cell surface expression of junctional adhesion molecule-A drives CSC maintenance and identified downstream signaling networks, including the cysteine protease inhibitor SerpinB3. Using genetic depletion approaches, we found that SerpinB3 is necessary for CSC maintenance, survival, and tumor growth, as well as CSC pathway activation. Knockdown of SerpinB3 also increased apoptosis and susceptibility to radiation therapy. SerpinB3 was essential to buffer cathepsin L-mediated cell death, which was enhanced with radiation. Finally, we found that SerpinB3 knockdown increased the efficacy of radiation in pre-clinical models. Taken together, our findings identify a GBM CSC-specific survival mechanism involving a cysteine protease inhibitor, SerpinB3, and provide a potential target to improve the efficacy of GBM therapies against therapeutically resistant CSCs.

Original languageEnglish (US)
Article number111348
JournalCell reports
Issue number11
StatePublished - Sep 13 2022


  • CP: Cancer
  • SerpinB3
  • cancer stem cell
  • cathepsin L
  • glioblastoma
  • lysosomal-mediated cell death

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)


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