Sarita Joshi1,2, Paula M De Angelis1, Manuela Zucknick3, Aasa R Schjølberg1, Solveig Norheim Andersen2, Ole Petter F Clausen1. 1. Department of Pathology, Rikshospitalet, Oslo University Hospital, Oslo, Norway. 2. Institute of Clinical Medicine, Department of Pathology, Akershus University Hospital, Lørenskog, Norway. 3. Oslo Centre for Biostatistics and Epidemiology, Department of Biostatistics, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway.
Abstract
BACKGROUND: Keratoacanthoma (KA) has a unique life cycle of rapid growth and spontaneous regression that shows similarities to the hair follicle cycle, which involves an active Wnt signaling during physiological regeneration. We analyzed the expression of the Wnt signaling proteins β-catenin, Lef1, Sox9, and Cyclin D1 in young and old human KAs to investigate a possible role for Wnt signaling in KAs. AIM: To investigate the role of the Wnt/β-catenin signaling pathway in human KAs. METHODS AND RESULTS: Formalin-fixed, paraffin-embedded tissue samples of 67 KAs were analyzed for protein expression using immunohistochemistry. The majority of KAs were positive for Sox9 and Cyclin D1 but not for nuclear-localized β-catenin or Lef-1. No significant differences in protein expressions were seen between young and old KAs. However, we found a significant association between Ki67 and Cyclin D1 proteins (P= .008). CONCLUSIONS: The Wnt signaling pathway does not appear to play a significant role in the biogenesis of human KA. Sox9 overexpression may be indicative of inhibition of Wnt signaling. Sox-9 and Cyclin D1 are proliferation markers that are most likely transactivated by alternate signaling pathways.
BACKGROUND:Keratoacanthoma (KA) has a unique life cycle of rapid growth and spontaneous regression that shows similarities to the hair follicle cycle, which involves an active Wnt signaling during physiological regeneration. We analyzed the expression of the Wnt signaling proteins β-catenin, Lef1, Sox9, and Cyclin D1 in young and old human KAs to investigate a possible role for Wnt signaling in KAs. AIM: To investigate the role of the Wnt/β-catenin signaling pathway in human KAs. METHODS AND RESULTS:Formalin-fixed, paraffin-embedded tissue samples of 67 KAs were analyzed for protein expression using immunohistochemistry. The majority of KAs were positive for Sox9 and Cyclin D1 but not for nuclear-localized β-catenin or Lef-1. No significant differences in protein expressions were seen between young and old KAs. However, we found a significant association between Ki67 and Cyclin D1 proteins (P= .008). CONCLUSIONS: The Wnt signaling pathway does not appear to play a significant role in the biogenesis of human KA. Sox9 overexpression may be indicative of inhibition of Wnt signaling. Sox-9 and Cyclin D1 are proliferation markers that are most likely transactivated by alternate signaling pathways.
Authors: F Bremmer; C L Behnes; H U Schildhaus; N T Gaisa; H Reis; H Jarry; H J Radzun; P Stroebel; S Schweyer Journal: Virchows Arch Date: 2017-02-16 Impact factor: 4.064
Authors: Haruhiko Akiyama; Jon P Lyons; Yuko Mori-Akiyama; Xiaohong Yang; Ren Zhang; Zhaoping Zhang; Jian Min Deng; Makoto M Taketo; Takashi Nakamura; Richard R Behringer; Pierre D McCrea; Benoit de Crombrugghe Journal: Genes Dev Date: 2004-05-01 Impact factor: 11.361
Authors: Sarita Joshi; Paula M De Angelis; Manuela Zucknick; Aasa R Schjølberg; Solveig Norheim Andersen; Ole Petter F Clausen Journal: Cancer Rep (Hoboken) Date: 2019-11-11