Loss of Pin1 Suppresses Hedgehog-Driven Medulloblastoma Tumorigenesis

Tao Xu, Honglai Zhang, Sung Soo Park, Sriram Venneti, Rork Kuick, Kimberly Ha, Lowell Evan Michael, Mariarita Santi, Chiyoko Uchida, Takafumi Uchida, Ashok Srinivasan, James M. Olson, Andrzej A. Dlugosz, Sandra Camelo-Piragua, Jean François Rual

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Medulloblastoma is the most common malignant brain tumor in children. Therapeutic approaches to medulloblastoma (combination of surgery, radiotherapy, and chemotherapy) have led to significant improvements, but these are achieved at a high cost to quality of life. Alternative therapeutic approaches are needed. Genetic mutations leading to the activation of the Hedgehog pathway drive tumorigenesis in ~30% of medulloblastoma. In a yeast two-hybrid proteomic screen, we discovered a novel interaction between GLI1, a key transcription factor for the mediation of Hedgehog signals, and PIN1, a peptidylprolyl cis/trans isomerase that regulates the postphosphorylation fate of its targets. The GLI1/PIN1 interaction was validated by reciprocal pulldowns using epitope-tagged proteins in HEK293T cells as well as by co-immunoprecipiations of the endogenous proteins in a medulloblastoma cell line. Our results support a molecular model in which PIN1 promotes GLI1 protein abundance, thus contributing to the positive regulation of Hedgehog signals. Most importantly, in vivo functional analyses of Pin1 in the GFAP-tTA;TRE-SmoA1 mouse model of Hedgehog-driven medulloblastoma demonstrate that the loss of Pin1 impairs tumor development and dramatically increases survival. In summary, the discovery of the GLI1/PIN1 interaction uncovers PIN1 as a novel therapeutic target in Hedgehog-driven medulloblastoma tumorigenesis.

Original languageEnglish
Pages (from-to)216-225
Number of pages10
JournalNeoplasia (United States)
Issue number3
Publication statusPublished - 2017 Mar 1

ASJC Scopus subject areas

  • Cancer Research


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