The serine protease HtrA1 specifically interacts and degrades the tuberous sclerosis complex 2 protein

Mara Campioni, Anna Severino, Lucrezia Manente, Ioana L. Tuduce, Stefano Toldo, Michele Caraglia, Stefania Crispi, Michael Ehrmann, Xiaoping He, Jacie Maguire, Maria De Falco, Antonio De Luca, Viji Shridhar, Alfonso Baldi

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


Hamartin and tuberin are products of the tumor suppressor genes TSC1 and TSC2, respectively. Mutations affecting either gene result in the tuberous sclerosis syndrome, a neurologic genetic disorder characterized by the formation of multiple benign tumors or hamartomas. In this study, we report the identification of TSC2, but not TSC1, as a substrate of HtrA1, a member of the human HtrA family proteins of serine proteases. We show the direct interaction and colocalization in the cytoplasm of HtrA1 and TSC2 and that HtrA1 cleaves TSC2 both in vitro and in vivo. Finally, we show that alterations in HtrA1 expression cause modifications in phosphorylation status of two downstream targets of TSC2: 4E-BP1 and S6K. Our data suggest that, under particular physiologic or pathologic conditions, HtrA1 degrades TSC2 and activates the downstream targets. Considering that HtrA1 levels are significantly increased during embryogenesis, we speculate that one of the targets of HtrA1 activity during fetal development is the TSC2-TSC1 pathway.

Original languageEnglish (US)
Pages (from-to)1248-1260
Number of pages13
JournalMolecular Cancer Research
Issue number9
StatePublished - Sep 2010

ASJC Scopus subject areas

  • Molecular Biology
  • Oncology
  • Cancer Research


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