Journal of Endocrinological Investigation

, Volume 26, Issue 10, pp 957–965

Human pituitary tumours express the bHLH transcription factors NeuroD1 and ASH1

  • E. Ferretti
  • D. Di Stefano
  • F. Zazzeroni
  • R. Gallo
  • A. Fratticci
  • R. Carfagnini
  • S. Angiulli
  • A. Santoro
  • G. Minniti
  • G. Tamburrano
  • E. Alesse
  • G. Cantore
  • A. Gulino
  • M. L. Jaffrain-Rea
Original Article

DOI: 10.1007/BF03348192

Cite this article as:
Ferretti, E., Di Stefano, D., Zazzeroni, F. et al. J Endocrinol Invest (2003) 26: 957. doi:10.1007/BF03348192

Abstract

Among the transcription factors involved in pituitary ontogenesis and physiology, basic helix-loop-helix (bHLH) have been poorly studied. Members of bHLH family include NeuroD1 and ASH1, both involved in neuroendocrine differentiation. We evaluated their mRNA expression patterns, by semi-quantitative RT-PCR analysis (sq-RTPCR) and/or Northern blot, in a series of 33 pituitary adenomas (PA), anterior pituitaries, and pituitary cell lines. Immunohistochemistry for NeuroD1 was also performed in 25 PA. Low levels of NeuroD1 were observed in normal pituitaries and in the somatomammotroph cell lines GH3/GH4C1, contrasting with high levels in corticotroph AtT20 cells. NeuroD1 mRNA was widely expressed in PA (82%), with measurable levels found especially in those derived from Pit-1 independent lineages, i.e. corticotroph (5/5) and clinically non-secreting (CNS) adenomas (9/11). According to sq-RT-PCR analysis, overexpression of NeuroD1 compared to normal pituitaries was frequent. Variable nuclear NeuroD1 immunopositivity was also present in about 70% of studied cases. ASH1 mRNA was widely detected in normal pituitaries, in all tumour cell lines and in most PA (84%), with measurable levels in corticotroph (5/5) and CNS (9/11) adenomas, and in a significant subset of PA derived from Pit-1 dependent lineages (9/16). We conclude that: a) NeuroD1 is differentially expressed in PA and its possible ontogenetic and/or pathogenetic implications in non-corticotroph PA are discussed; b) ASH1 is a neuroendocrine marker whose expression is largely conserved in normal and neoplastic pituitary cells.

Key-words

Transcription factorsNeuroD1ASH1pituitary tumourspathogenesis

Copyright information

© Italian Society of Endocrinology (SIE) 2003

Authors and Affiliations

  • E. Ferretti
    • 1
  • D. Di Stefano
    • 2
  • F. Zazzeroni
    • 1
  • R. Gallo
    • 1
  • A. Fratticci
    • 1
  • R. Carfagnini
    • 1
  • S. Angiulli
    • 1
  • A. Santoro
    • 3
  • G. Minniti
    • 5
  • G. Tamburrano
    • 4
  • E. Alesse
    • 1
  • G. Cantore
    • 3
    • 5
  • A. Gulino
    • 2
    • 5
  • M. L. Jaffrain-Rea
    • 1
  1. 1.Department of Experimental MedicineUniversity of L’AquilaL’AquilaItaly
  2. 2.Department of Experimental Medicine and PathologyUniversity “La Sapienza”RomeItaly
  3. 3.Department of Neurological SciencesUniversity “La Sapienza”RomeItaly
  4. 4.Department of Clinical SciencesUniversity “La Sapienza”RomeItaly
  5. 5.Neuromed InstituteIRCCS PozzilliItaly