Expression of the GLI2 oncogene and its isoforms in human basal cell carcinoma

Michiko Tojo, H. Kiyosawa, K. Iwatsuki, K. Nakamura, F. Kaneko

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Background: Mutations of the patched (Ptc) gene, a developmental regulator implicated in the signalling pathway via sonic hedgehog (Shh) and smoothened (Smo), play an essential pathogenic role in the development of basal cell carcinomas (BCCs). We previously reported the upregulation of Shh signal transducers, including Ptc. Smo and hedgehog-interacting protein, in BCCs. In vertebrates, specific downstream effectors in the Shh signalling pathway include three zinc-finger transcription factors, Gli1, Gli2 and Gli3. Gli1 possesses only an activation domain, while Gli2 and Gli3 contain both activation and repression domains. It remains unclear which of these transcription factors are responsible for the development of BCCs. Objectives: To examine the expression pattern of Gli2 mRNA by human BCCs in comparison with those by normal human skin and various skin tumours. Methods: We performed quantitative reverse transcriptase-polymerase chain reaction analyses with a series of samples from BCCs, other skin tumours and normal skin. Results: We found that Gli2 mRNA expression was enhanced in the BCCs we examined, whereas there was no significant increase in other skin tumours or normal skin. Of four spliced Gli2 isoforms designated Gli2α, β, γ and δ, the expressionof Gli2β mRNA was increased the most in BCCs. Conclusions: As Gli2β is an isoform spliced at the first splicing site containing a repression domain and consists of an intact activation domain, its overexpression may lead to the upregulation of the Shh signalling pathway, thereby inducing BCCs.

Original languageEnglish
Pages (from-to)892-897
Number of pages6
JournalBritish Journal of Dermatology
Volume148
Issue number5
DOIs
Publication statusPublished - May 1 2003

Fingerprint

Basal Cell Carcinoma
Oncogenes
Protein Isoforms
Hedgehogs
Skin
Messenger RNA
Transcription Factors
Up-Regulation
Hedgehog Proteins
Developmental Genes
Neoplasms
Zinc Fingers
Reverse Transcriptase Polymerase Chain Reaction
Transducers
Vertebrates
Mutation

Keywords

  • Basal cell carcinoma
  • Gli2
  • Isoform
  • mRNA
  • Sonic hedgehog

ASJC Scopus subject areas

  • Dermatology

Cite this

Expression of the GLI2 oncogene and its isoforms in human basal cell carcinoma. / Tojo, Michiko; Kiyosawa, H.; Iwatsuki, K.; Nakamura, K.; Kaneko, F.

In: British Journal of Dermatology, Vol. 148, No. 5, 01.05.2003, p. 892-897.

Research output: Contribution to journalArticle

Tojo, Michiko ; Kiyosawa, H. ; Iwatsuki, K. ; Nakamura, K. ; Kaneko, F. / Expression of the GLI2 oncogene and its isoforms in human basal cell carcinoma. In: British Journal of Dermatology. 2003 ; Vol. 148, No. 5. pp. 892-897.
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