Molecular Oncology
Volume 4, Issue 2 , Pages 126-134, April 2010

Prep1 (pKnox1)-deficiency leads to spontaneous tumor development in mice and accelerates EμMyc lymphomagenesis: A tumor suppressor role for Prep1

  • E. Longobardi

      Affiliations

    • Università Vita Salute San Raffaele, via Olgettina 60, Milano 20132, Italy
    • IFOM (Fondazione Istituto FIRC di Oncologia Molecolare), IFOM-IEO-Campus, via Adamello 16, 20139 Milano, Italy
    • Both authors contributed equally to this work.
  • ,
  • G. Iotti

      Affiliations

    • IFOM (Fondazione Istituto FIRC di Oncologia Molecolare), IFOM-IEO-Campus, via Adamello 16, 20139 Milano, Italy
    • Both authors contributed equally to this work.
  • ,
  • P. Di Rosa

      Affiliations

    • Università Vita Salute San Raffaele, via Olgettina 60, Milano 20132, Italy
  • ,
  • S. Mejetta

      Affiliations

    • IFOM (Fondazione Istituto FIRC di Oncologia Molecolare), IFOM-IEO-Campus, via Adamello 16, 20139 Milano, Italy
  • ,
  • F. Bianchi

      Affiliations

    • IFOM (Fondazione Istituto FIRC di Oncologia Molecolare), IFOM-IEO-Campus, via Adamello 16, 20139 Milano, Italy
  • ,
  • L.C. Fernandez-Diaz

      Affiliations

    • IFOM (Fondazione Istituto FIRC di Oncologia Molecolare), IFOM-IEO-Campus, via Adamello 16, 20139 Milano, Italy
  • ,
  • N. Micali

      Affiliations

    • IFOM (Fondazione Istituto FIRC di Oncologia Molecolare), IFOM-IEO-Campus, via Adamello 16, 20139 Milano, Italy
  • ,
  • P. Nuciforo

      Affiliations

    • IFOM (Fondazione Istituto FIRC di Oncologia Molecolare), IFOM-IEO-Campus, via Adamello 16, 20139 Milano, Italy
  • ,
  • E. Lenti

      Affiliations

    • Università Vita Salute San Raffaele, via Olgettina 60, Milano 20132, Italy
  • ,
  • M. Ponzoni

      Affiliations

    • Servizio di Anatomia Patologica, Istituto Scientifico S. Raffaele, via Olgettina 60, 20132 Milano, Italy
  • ,
  • C. Doglioni

      Affiliations

    • Servizio di Anatomia Patologica, Istituto Scientifico S. Raffaele, via Olgettina 60, 20132 Milano, Italy
  • ,
  • M. Caniatti

      Affiliations

    • Dipartimento di Patologia, Igiene e Sanità Pubblica Veterinaria, Sezione di Anatomia Patologica Veterinaria e Patologia Aviaria, Università degli Studi di Milano, Via Celoria 10, 20133 Milano, Italy
  • ,
  • P.P. Di Fiore

      Affiliations

    • IFOM (Fondazione Istituto FIRC di Oncologia Molecolare), IFOM-IEO-Campus, via Adamello 16, 20139 Milano, Italy
    • Department of Experimental Oncology, Istituto Europeo di Oncologia, IFOM-IEO-Campus, via Adamello 16, 20139 Milan, Italy
    • Dipartimento di Medicina, Chirurgia ed Odontoiatria, Università degli Studi di Milano, Via di Rudinì 8, 20122 Milan, Italy
  • ,
  • F. Blasi

      Affiliations

    • Università Vita Salute San Raffaele, via Olgettina 60, Milano 20132, Italy
    • IFOM (Fondazione Istituto FIRC di Oncologia Molecolare), IFOM-IEO-Campus, via Adamello 16, 20139 Milano, Italy
    • Corresponding Author InformationCorresponding author to: IFOM, via Adamello 16, 20139 Milan, Italy. Tel.: +3902574303288; fax: +3902574303231.

Received 25 November 2009; received in revised form 28 December 2009; accepted 4 January 2010. published online 13 January 2010.

Abstract 

The Prep1 homeodomain transcription factor is essential for embryonic development. 25% of hypomorphic Prep1i/i embryos, expressing the gene at 2% of the normal levels, survive pregnancy and live a normal-length life. Later in life, however, these mice develop spontaneous pre-tumoral lesions or solid tumors (lymphomas and carcinomas). In addition, transplantation of E14.5 fetal liver (FL) Prep1i/i cells into lethally irradiated mice induces lymphomas. In agreement with the above data, haploinsufficiency of a different Prep1-deficient (null) allele accelerates EμMyc lymphoma growth. Therefore Prep1 has a tumor suppressor function in mice.

Immunohistochemistry on tissue micrroarrays (TMA) generated from three distinct human cohorts comprising a total of some 1000 human tumors revealed that 70% of the tumors express no or extremely low levels of Prep1, unlike normal tissues. Our data in mice are thus potentially relevant to human cancer.

Keywords: Prep1, Pbx1, Meis1, Tumor suppressor, EmuMyc

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PII: S1574-7891(10)00002-5

doi:10.1016/j.molonc.2010.01.001

Molecular Oncology
Volume 4, Issue 2 , Pages 126-134, April 2010