Search for KPNA7 cargo proteins in human cells reveals MVP and ZNF414 as novel regulators of cancer cell growth.
Karyopherin alpha 7 (KPNA7) belongs to a family of nuclear import proteins that recognize and bind nuclear localization signals (NLSs) in proteins to be transported to the nucleus. Previously we found that KPNA7 is overexpressed in a subset of pancreatic cancer cell lines and acts as a critical regulator of growth in these cells. This characteristic of KPNA7 is likely to be mediated by its cargo proteins that are still mainly unknown. Here, we used protein affinity chromatography in Hs700T and MIA PaCa-2 pancreatic cancer cell lines and identified 377 putative KPNA7 cargo proteins, most of which were known or predicted to localize to the nucleus. The interaction was confirmed for two of the candidates, MVP and ZNF414, using co-immunoprecipitation, and their transport to the nucleus was hindered by siRNA based KPNA7 silencing. Most importantly, silencing of MVP and ZNF414 resulted in marked reduction in Hs700T cell growth. In conclusion, these data uncover two previously unknown human KPNA7 cargo proteins with distinct roles as novel regulators of pancreatic cancer cell growth, thus deepening our understanding on the contribution of nuclear transport in cancer pathogenesis.
University of Tampere, BioMediTech, PL 100, 33014 TAMPEREEN YLIOPISTO, Tampere, Finland; Fimlab laboratories, Biokatu 4, 33520 Tampere, Finland. Electronic address: elisa.vuorinen@uta.fi.
Elisa M
EM
Vuorinen
University of Tampere, BioMediTech, PL 100, 33014 TAMPEREEN YLIOPISTO, Tampere, Finland; Fimlab laboratories, Biokatu 4, 33520 Tampere, Finland. Electronic address: nina.rajala@uta.fi.
Nina K
NK
Rajala
University of Tampere, BioMediTech, PL 100, 33014 TAMPEREEN YLIOPISTO, Tampere, Finland. Electronic address: hanna.e.rauhala@uta.fi.
Hanna E
HE
Rauhala
University of Tampere, BioMediTech, PL 100, 33014 TAMPEREEN YLIOPISTO, Tampere, Finland; Fimlab laboratories, Biokatu 4, 33520 Tampere, Finland. Electronic address: anssi.nurminen@uta.fi.
Anssi T
AT
Nurminen
University of Tampere, BioMediTech, PL 100, 33014 TAMPEREEN YLIOPISTO, Tampere, Finland; Fimlab laboratories, Biokatu 4, 33520 Tampere, Finland. Electronic address: vesa.hytonen@uta.fi.
Vesa P
VP
Hytönen
University of Tampere, BioMediTech, PL 100, 33014 TAMPEREEN YLIOPISTO, Tampere, Finland; Fimlab laboratories, Biokatu 4, 33520 Tampere, Finland. Electronic address: anne.kallioniemi@uta.fi.
Anne
A
Kallioniemi
D021581:Active Transport, Cell Nucleus; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D004268:DNA-Binding Proteins / Q000378:metabolism*; D006801:Humans; D010190:Pancreatic Neoplasms / Q000378:metabolism* / Q000473:pathology; D060066:Protein Interaction Maps; D014157:Transcription Factors / Q000378:metabolism*; D020394:Vault Ribonucleoprotein Particles / Q000378:metabolism*; D028901:alpha Karyopherins / Q000378:metabolism*; D000099187:Major Vault Protein
D004268:DNA-Binding Proteins; D014157:Transcription Factors; D020394:Vault Ribonucleoprotein Particles; D028901:alpha Karyopherins; D000099187:Major Vault Protein; C587929:KPNA7 protein, human; C000629251:ZNF414 protein, human
Affinity chromatography; Importin alpha 8; KPNA7; Nuclear transfer; Pancreatic cancer