A functional family-wide screening of SP/KLF proteins identifies a subset of suppressors of KRAS-mediated cell growth

Martin E Fernandez-Zapico, Gwen A. Lomberk, Shoichiro Tsuji, Cathrine J. DeMars, Michael R. Bardsley, Yi Hui Lin, Luciana L. Almada, Jing Jing Han, Debabrata Mukhopadhyay, Tamas Ordog, Navtej Singh Buttar, Raul Urrutia

Research output: Contribution to journalArticle

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Abstract

SP/KLF (Specificity protein/Krüppel-like factor) transcription factors comprise an emerging group of proteins that may behave as tumour suppressors. Incidentally, many cancers that display alterations in certain KLF proteins are also associated with a high incidence of KRAS (V-Ki-ras2 Kirsten rat sarcoma viral oncogene homologue) mutations. Therefore in the present paper we investigate whether SP/KLF proteins suppress KRAS-mediated cell growth, and more importantly, the potential mechanisms underlying these effects. Using a comprehensive family-wide screening of the 24 SP/KLF members, we discovered that SP5, SP8, KLF2, KLF3, KLF4, KLF11, KLF13, KLF14, KLF15 and KLF16 inhibit cellular growth and suppress transformation mediated by oncogenic KRAS. Each protein in this subset of SP/KLF members individually inhibits BrdU (5-bromo-2-deoxyuridine) incorporation in KRAS oncogenic-mutant cancer cells. SP5, KLF3, KLF11, KLF13, KLF14 and KLF16 also increase apoptosis in these cells. Using KLF11 as a representative model for mechanistic studies, we demonstrate that this protein inhibits the ability of cancer cells to form both colonies in soft agar and tumour growth in vivo. Molecular studies demonstrate that these effects of KLF11 are mediated, at least in part, through silencing cyclin A via binding to its promoter and leading to cellcycle arrest in S-phase. Interestingly, similar to KLF11, KLF14 and KLF16 mechanistically share the ability to modulate the expression of cyclin A. Collectively, the present study stringently defines a distinct subset of SP/KLF proteins that impairs KRASmediated cell growth, and that mechanistically some members of this subset accomplish this, at least in part, through regulation of the cyclin A promoter.

Original languageEnglish (US)
Pages (from-to)529-537
Number of pages9
JournalBiochemical Journal
Volume435
Issue number2
DOIs
StatePublished - Apr 15 2011

Fingerprint

Cell growth
Screening
Growth
Proteins
Cyclin A
Neoplasms
Tumors
Cells
Bromodeoxyuridine
S Phase
Oncogenes
Sarcoma
Agar
Rats
Transcription Factors
Apoptosis
Mutation

Keywords

  • Cyclin A
  • Krüppel-like factor (KLF) protein
  • Krüppel-like factor 11 (KLF11)
  • Pancreatic cancer
  • Tumour suppression
  • V-Ki-ras2 Kirsten rat sarcoma viral oncogene homologue (KRAS)

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Cite this

A functional family-wide screening of SP/KLF proteins identifies a subset of suppressors of KRAS-mediated cell growth. / Fernandez-Zapico, Martin E; Lomberk, Gwen A.; Tsuji, Shoichiro; DeMars, Cathrine J.; Bardsley, Michael R.; Lin, Yi Hui; Almada, Luciana L.; Han, Jing Jing; Mukhopadhyay, Debabrata; Ordog, Tamas; Buttar, Navtej Singh; Urrutia, Raul.

In: Biochemical Journal, Vol. 435, No. 2, 15.04.2011, p. 529-537.

Research output: Contribution to journalArticle

Fernandez-Zapico, Martin E ; Lomberk, Gwen A. ; Tsuji, Shoichiro ; DeMars, Cathrine J. ; Bardsley, Michael R. ; Lin, Yi Hui ; Almada, Luciana L. ; Han, Jing Jing ; Mukhopadhyay, Debabrata ; Ordog, Tamas ; Buttar, Navtej Singh ; Urrutia, Raul. / A functional family-wide screening of SP/KLF proteins identifies a subset of suppressors of KRAS-mediated cell growth. In: Biochemical Journal. 2011 ; Vol. 435, No. 2. pp. 529-537.
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AU - Bardsley, Michael R.

AU - Lin, Yi Hui

AU - Almada, Luciana L.

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