Reduced SMAD2/3 activation independently predicts increased depth of human cutaneous squamous cell carcinoma

Aidan M. Rose, Lindsay C. Spender, Christopher Stephen, Alastair Mitchell, William Rickaby, Susan Bray, Alan T. Evans, Jasbani Dayal, Karin J. Purdie, Catherine A. Harwood, Charlotte M. Proby, Irene M. Leigh, Philip J . Coates, Gareth J. Inman (Lead / Corresponding author)

Research output: Contribution to journalArticle

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Abstract

The incidence of cutaneous squamous cell carcinoma (cSCC) is rising. Whilst the majority are cured surgically, aggressive metastatic cSCC carry a poor prognosis. Inactivating mutations in transforming growth factor beta (TGF-β) receptors have been identified amongst genetic drivers of sporadic tumours and murine models of cSCC, suggesting a tumour suppressor function for TGF-β in normal skin. However, paradoxically, TGF-β acts as a tumour promoter in some murine model systems. Few studies have analysed the role of TGF-β/activin signalling in human normal skin, hyper-proliferative skin disorders and cSCC. Antibodies recognising phospho- SMAD proteins which are activated during canonical TGF-β/activin signalling were validated for use in immunohistochemistry. A tissue microarray comprising FFPE lesional and perilesional tissue from human primary invasive cSCC (n=238), cSCC in-situ (n=2) and keratocanthoma (n=9) were analysed in comparison with tissues from normal human scalp (n=10). Phosphorylated SMAD2 and SMAD3 were detected in normal interfollicular epidermal keratinocytes and were also highly localised to inner root sheath, matrix cells and Keratin 15 positive cells. Lesional cSCC tissue had significantly reduced activated SMAD2/3 compared to perilesional tissue, consistent with a tumour suppressor role for SMAD2/3 activators in cSCC. Increased cSCC tumour thickness inversely correlated with the presence of phospho-SMADs in tumour tissue suggesting that a reduction in canonical TGF-β/activin signalling may be associated with disease progression.

Original languageEnglish
Pages (from-to)14552-14566
Number of pages15
JournalOncotarget
Volume9
Issue number18
Early online date22 Feb 2018
DOIs
Publication statusPublished - 6 Mar 2018

Keywords

  • Carcinoma
  • FFPE
  • IHC
  • SMAD
  • TGF-β

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