Expression of proteinase inhibitor-9/serpinB9 in non-small cell lung carcinoma cells and tissues

Ilona Rousalova, Evzen Krepela, Jan Prochazka, Jan Cermak, Kamila Benkova

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Human proteinase inhibitor-9 (PI-9)/serpinB9 is an intracellular ovalbumin-family serpin with nucleocytoplasmic distribution which is expressed in certain normal cell types and cancer cells of different origin. Due to binding and inactivating of granzyme B (GrB), PI-9 can protect the cells from GrB-mediated apoptosis. High levels of PI-9 expression in certain cancer cells may contribute to their resistance against the immune mediated killing. So far, it is not known whether non-small cell lung cardinomas (NSCLCs) express PI-9 mRNA and a functional PI-9 protein. Herein we report for the first time that NSCLC cells express both PI-9 mRNA and protein and that there is a subset of NSCLC cells with upregulated PI-9 mRNA and protein expression. Futhermore, our work revealed that the PI-9 protein expressed in NSCLC cells can inhibit the active GrB. Finally, analysis of PI-9 mRNA expression in NSCLC tumours from surgically treated patients showed that the expression of this transcript is upregulated in the less-differentiated lung adenocarcinomas. We suggest, that the upregulated expression of PI-9 in NSCLC cells may serve to protect them from apoptosis induced by GrB.

Original languageEnglish (US)
Pages (from-to)275-283
Number of pages9
JournalInternational Journal of Oncology
Issue number1
StatePublished - Jan 1 2010


  • Apoptosis
  • Caspase
  • Expression
  • Granzyme B
  • Non-small cell lung carcinoma
  • Proteinase inhibitor-9
  • SerpinB9

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