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Kurtović M, Piteša N, Čonkaš J, Hajpek H, Vučić M, Musani V, Ozretić P, Sabol M. GLI Transcriptional Targets S100A7 and KRT16 Show Upregulated Expression Patterns in Epidermis Overlying the Tumor Mass in Melanoma Samples. Int J Mol Sci 2024; 25:6084. [PMID: 38892279 PMCID: PMC11172526 DOI: 10.3390/ijms25116084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2024] [Revised: 05/27/2024] [Accepted: 05/28/2024] [Indexed: 06/01/2024] Open
Abstract
Although not completely understood, the role of the Hedgehog-GLI (HH-GLI) signaling pathway in melanoma and epithelial skin tumors has been reported before. In this study, we confirmed in various melanoma cell line models that keratin 16 (KRT16) and S100 Calcium-Binding Protein A7 (S100A7) are transcriptional targets of GLI Family Zinc Finger (GLI) proteins. Besides their important role in protecting and maintaining the epidermal barrier, keratins are somehow tightly connected with the S100 family of proteins. We found that stronger expression of KRT16 indeed corresponds to stronger expression of S100A7 in our clinical melanoma samples. We also report a trend regarding staining of GLI1, which corresponds to stronger staining of GLI3, KRT16, and S100A7 proteins. The most interesting of our findings is that all the proteins are detected specifically in the epidermis overlying the tumor, but rarely in the tumor itself. The examined proteins were also not detected in the healthy epidermis at the edges of the sample, suggesting that the staining is specific to the epidermis overlaying the tumor mass. Of all proteins, only S100A7 demonstrated a statistically significant trend regarding tumor staging and staining intensity. Results from our clinical samples prove that immune infiltration is an important feature of melanoma. Pigmentophages and tumor-infiltrating lymphocytes (TIL) demonstrate a significant association with tumor stage, while mononuclear cells are equally present in all stages. For S100A7, we found an association between the number of TILs and staining intensity. Considering these new findings presented in our study, we suggest a more detailed examination of the possible role of the S100A7 protein as a biomarker in melanoma.
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Affiliation(s)
- Matea Kurtović
- Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; (M.K.); (N.P.); (J.Č.); (H.H.); (V.M.); (P.O.)
| | - Nikolina Piteša
- Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; (M.K.); (N.P.); (J.Č.); (H.H.); (V.M.); (P.O.)
| | - Josipa Čonkaš
- Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; (M.K.); (N.P.); (J.Č.); (H.H.); (V.M.); (P.O.)
| | - Helena Hajpek
- Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; (M.K.); (N.P.); (J.Č.); (H.H.); (V.M.); (P.O.)
- Department of Biology, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia
| | - Majda Vučić
- Ljudevit Jurak Clinical Department of Pathology and Cytology, Sestre Milosrdnice University Hospital Center, 10000 Zagreb, Croatia;
- Department of Pathology, School of Dental Medicine, University of Zagreb, 10000 Zagreb, Croatia
| | - Vesna Musani
- Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; (M.K.); (N.P.); (J.Č.); (H.H.); (V.M.); (P.O.)
| | - Petar Ozretić
- Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; (M.K.); (N.P.); (J.Č.); (H.H.); (V.M.); (P.O.)
| | - Maja Sabol
- Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; (M.K.); (N.P.); (J.Č.); (H.H.); (V.M.); (P.O.)
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Paudel S, Raina K, Tiku VR, Maurya A, Orlicky DJ, You Z, Rigby CM, Deep G, Kant R, Raina B, Agarwal C, Agarwal R. Chemopreventive efficacy of silibinin against basal cell carcinoma growth and progression in UVB-irradiated Ptch+/- mice. Carcinogenesis 2022; 43:557-570. [PMID: 35184170 PMCID: PMC9234765 DOI: 10.1093/carcin/bgac023] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 01/23/2022] [Accepted: 02/18/2022] [Indexed: 11/15/2022] Open
Abstract
The factors (environmental and genetic) contributing to basal cell carcinoma (BCC) pathogenesis are well-established; however, effective agents for BCC prevention are marred by toxic side-effects. Herein, we assessed the efficacy of flavonolignan silibinin against ultraviolet B (UVB)-induced BCC in Ptch+/- (heterozygous patched homolog 1 gene) mouse model. Both male and female Ptch+/- mice were irradiated with a 240 mJ/cm2 UVB dose 3 times/week for 26 or 46 weeks, with or without topical application of silibinin (9 mg/200 µl in acetone, applied 30 min before or after UVB exposure). Results indicated that silibinin application either pre- or post-UVB exposure for 26 weeks significantly decreased the number of BCC lesions by 65% and 39% (P < 0.001 for both) and the area covered by BCCs (72% and 45%, P < 0.001 for both), respectively, compared to UVB alone. Furthermore, continuous UVB exposure for 46 weeks increased the BCC lesion number and the BCC area covered by ~6 and ~3.4 folds (P < 0.001), respectively. Notably, even in this 46 week prolonged UVB exposure, silibinin (irrespective of pre- or post-UVB treatment) significantly halted the growth of BCCs by 81-94% (P < 0.001) as well as other epidermal lesions; specifically, silibinin treated tissues had less epidermal dysplasia, fibrosarcoma, and squamous cell carcinoma. Immunohistochemistry and immunofluorescence studies revealed that silibinin significantly decreased basal cell proliferation (Ki-67) and the expression of cytokeratins (14 and 15), and Hedgehog signaling mediators Smo and Gli1 in the BCC lesions. Together, our findings demonstrate strong potential of silibinin to be efficacious in preventing the growth and progression of UVB-induced BCC.
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Affiliation(s)
- Sandeep Paudel
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado DenverAnschutz Medical Campus, Aurora, CO, USA
| | - Komal Raina
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado DenverAnschutz Medical Campus, Aurora, CO, USA,Department of Pharmaceutical Sciences, South Dakota State University, Brookings, SD, USA
| | - Vasundhara R Tiku
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado DenverAnschutz Medical Campus, Aurora, CO, USA
| | - Akhilendra Maurya
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado DenverAnschutz Medical Campus, Aurora, CO, USA
| | - David J Orlicky
- Department of Pathology, School of Medicine, University of Colorado DenverAnschutz Medical Campus, Aurora, CO, USA
| | - Zhiying You
- Department of Medicine, School of Medicine, University of Colorado DenverAnschutz Medical Campus, Aurora, CO, USA
| | - Cindy M Rigby
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado DenverAnschutz Medical Campus, Aurora, CO, USA
| | - Gagan Deep
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado DenverAnschutz Medical Campus, Aurora, CO, USA,Department of Cancer Biology, Atrium Health Wake Forest Baptist, Winston-Salem, NC, USA
| | - Rama Kant
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado DenverAnschutz Medical Campus, Aurora, CO, USA
| | - Bupinder Raina
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado DenverAnschutz Medical Campus, Aurora, CO, USA
| | - Chapla Agarwal
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado DenverAnschutz Medical Campus, Aurora, CO, USA
| | - Rajesh Agarwal
- To whom correspondence should be addressed. Tel: +1 303 724 4055; Fax +1 303 724 7266;
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Increased isoform-specific phosphodiesterase 4D expression is associated with pathology and cognitive impairment in Alzheimer's disease. Neurobiol Aging 2020; 97:56-64. [PMID: 33157432 DOI: 10.1016/j.neurobiolaging.2020.10.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 09/16/2020] [Accepted: 10/04/2020] [Indexed: 02/07/2023]
Abstract
Pharmacological phosphodiesterase 4D (PDE4D) inhibition shows therapeutic potential to restore memory function in Alzheimer's disease (AD), but will likely evoke adverse side effects. As PDE4D encodes multiple isoforms, targeting specific isoforms may improve treatment efficacy and safety. Here, we investigated whether PDE4D isoform expression and PDE4D DNA methylation is affected in AD and whether expression changes are associated with severity of pathology and cognitive impairment. In post-mortem temporal lobe brain material from AD patients (n = 42) and age-matched controls (n = 40), we measured PDE4D isoform expression and PDE4D DNA (hydroxy)methylation using quantitative polymerase chain reaction and Illumina 450k Beadarrays, respectively. Linear regression revealed increased PDE4D1, -D3, -D5, and -D8 expression in AD with concurrent (hydroxy)methylation changes in associated promoter regions. Moreover, increased PDE4D1 and -D3 expression was associated with higherplaque and tau pathology levels, higher Braak stages, and progressed cognitive impairment. Future studies should indicate functional roles of specific PDE4D isoforms and the efficacy and safety of their selective inhibition to restore memory function in AD.
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Lang BM, Balermpas P, Bauer A, Blum A, Brölsch GF, Dirschka T, Follmann M, Frank J, Frerich B, Fritz K, Hauschild A, Heindl LM, Howaldt HP, Ihrler S, Kakkassery V, Klumpp B, Krause-Bergmann A, Löser C, Meissner M, Sachse MM, Schlaak M, Schön MP, Tischendorf L, Tronnier M, Vordermark D, Welzel J, Weichenthal M, Wiegand S, Kaufmann R, Grabbe S. S2k-Leitlinie Basalzellkarzinom der Haut - Teil 1: Epidemiologie, Genetik und Diagnostik. J Dtsch Dermatol Ges 2019; 17:94-104. [PMID: 30615280 DOI: 10.1111/ddg.13733_g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
| | | | - Andrea Bauer
- Klinik und Poliklinik für Dermatologie, Universitätsklinikum Carl Gustav Carus Dresden
| | | | - G Felix Brölsch
- Klinik für Plastische, Ästhetische, Hand- und Wiederherstellungschirurgie, Medizinische Hochschule Hannover
| | - Thomas Dirschka
- CentroDerm, Wuppertal.,Fakultät für Gesundheit, Universität Witten-Herdecke
| | | | - Jorge Frank
- Klinik für Dermatologie, Venerologie und Allergologie, Universitätsmedizin Göttingen
| | - Bernhard Frerich
- Klinik und Poliklinik für Mund-, Kiefer- und plastische Gesichtschirurgie, Universitätsmedizin Rostock
| | | | - Axel Hauschild
- Klinik für Dermatologie, Venerologie und Allergologie, Universitätsklinikum Schleswig-Holstein, Campus Kiel
| | | | - Hans-Peter Howaldt
- Klinik und Poliklinik für Mund-, Kiefer- und Gesichtschirurgie, Universitätsklinikum Gießen
| | | | - Vinodh Kakkassery
- Klinik für Augenheilkunde, Universitätsklinikum Schleswig-Holstein, Campus Lübeck.,Klinik und Poliklinik für Augenheilkunde, Universitätsmedizin Rostock
| | - Bernhard Klumpp
- Abteilung für Diagnostische und Interventionelle Radiologie, Universitätsklinikum Tübingen.,Radiologie, Rems-Murr-Klinikum Winnenden
| | | | | | - Markus Meissner
- Klinik für Dermatologie, Venerologie und Allergologie, Universitätsklinikum Frankfurt
| | - Michael M Sachse
- Klinik für Dermatologie, Allergologie und Phlebologie, Klinikum Bremerhaven
| | - Max Schlaak
- Klinik und Poliklinik für Dermatologie und Allergologie, Klinikum der Universität München
| | - Michael P Schön
- Klinik für Dermatologie, Venerologie und Allergologie, Universitätsmedizin Göttingen
| | | | - Michael Tronnier
- Klinik für Dermatologie, Venerologie und Allergologie, Helios Klinikum Hildesheim
| | - Dirk Vordermark
- Universitätsklinik und Poliklinik für Strahlentherapie, Martin-Luther-Universität Halle-Wittenberg
| | - Julia Welzel
- Klinik für Dermatologie und Allergologie, Klinikum Augsburg
| | - Michael Weichenthal
- Klinik für Dermatologie, Venerologie und Allergologie, Universitätsklinikum Schleswig-Holstein, Campus Kiel
| | - Susanne Wiegand
- Klinik und Poliklinik für Hals-, Nasen-, Ohrenheilkunde, Universitätsklinikum Leipzig
| | - Roland Kaufmann
- Klinik für Dermatologie, Venerologie und Allergologie, Universitätsklinikum Frankfurt
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5
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Lang BM, Balermpas P, Bauer A, Blum A, Brölsch GF, Dirschka T, Follmann M, Frank J, Frerich B, Fritz K, Hauschild A, Heindl LM, Howaldt HP, Ihrler S, Kakkassery V, Klumpp B, Krause-Bergmann A, Löser C, Meissner M, Sachse MM, Schlaak M, Schön MP, Tischendorf L, Tronnier M, Vordermark D, Welzel J, Weichenthal M, Wiegand S, Kaufmann R, Grabbe S. S2k Guidelines for Cutaneous Basal Cell Carcinoma - Part 1: Epidemiology, Genetics and Diagnosis. J Dtsch Dermatol Ges 2018; 17:94-103. [PMID: 30592557 DOI: 10.1111/ddg.13733] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Basal cell carcinoma is the most common malignant tumor among fair-skinned individuals, and its incidence has been rising steadily in the past decades. In order to maintain the highest quality of patient care possible, the German S2k guidelines were updated following a systematic literature search and with the participation of all professional societies and associations involved in the management of the disease. Part 1 highlights new developments in genetics in particular as well as aspects regarding epidemiology, diagnosis, and histology.
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Affiliation(s)
- Berenice M Lang
- Department of Dermatology, Mainz University Medical Center, Mainz, Germany
| | - Panagiotis Balermpas
- Department of Radiation Oncology, Frankfurt University Medical Center, Frankfurt, Germany
| | - Andrea Bauer
- Department of Dermatology, Carl Gustav Carus University Medical Center, Dresden, Germany
| | - Andreas Blum
- Dermatology and Teaching Practice, Konstanz, Germany
| | - G Felix Brölsch
- Department of Plastic, Aesthetic, Hand and Reconstructive Surgery, Hanover Medical School, Hanover, Germany
| | - Thomas Dirschka
- CentroDerm Clinic, Wuppertal, Germany.,Faculty of Health, Witten-Herdecke University, Witten, Germany
| | | | - Jorge Frank
- Department of Dermatology, Venereology and Allergology, Göttingen University Medical Center, Göttingen, Germany
| | - Bernhard Frerich
- Department of Oral and Maxillofacial Plastic Surgery, Rostock University Medical Center, Rostock, Germany
| | - Klaus Fritz
- Dermatology and Laser Center, Landau, Germany
| | - Axel Hauschild
- Department of Dermatology, Venereology and Allergology, Schleswig-Holstein University Medical Center, Kiel, Germany
| | - Ludwig M Heindl
- Department of Ophthalmology, Cologne University Medical Center, Cologne, Germany
| | - Hans-Peter Howaldt
- Department of Oral and Maxillofacial Surgery, Gießen University Medical Center, Gießen, Germany
| | - Stephan Ihrler
- Laboratory for Dermatohistology and Oral Pathology, Munich, Germany
| | - Vinodh Kakkassery
- Department of Ophthalmology, Schleswig-Holstein University Medical Center, Lübeck, Germany.,Department of Ophthalmology, Rostock University Medical Center, Rostock, Germany
| | - Bernhard Klumpp
- Department of Diagnostic and Interventional Radiology, Tübingen University Medical Center, Tübingen, Germany.,Department of Radiology, Rems-Murr Medical Center, Winnenden, Germany
| | | | - Christoph Löser
- Department of Dermatology, Ludwigshafen Medical Center, Ludwigshafen, Germany
| | - Markus Meissner
- Department of Dermatology, Venereology and Allergology, Frankfurt University Medical Center, Frankfurt, Germany
| | - Michael M Sachse
- Department of Dermatology, Allergology and Phlebology, Bremerhaven Medical Center, Bremerhaven, Germany
| | - Max Schlaak
- Department of Dermatology and Allergology, Munich University Medical Center, Munich, Germany
| | - Michael P Schön
- Department of Dermatology, Venereology and Allergology, Göttingen University Medical Center, Göttingen, Germany
| | | | - Michael Tronnier
- Department of Dermatology, Venereology and Allergology, Helios Medical Center, Hildesheim, Germany
| | - Dirk Vordermark
- Department of Radiation Oncology, Halle University Medical Center, Martin Luther University, Halle, Germany
| | - Julia Welzel
- Department of Dermatology and Allergology, Augsburg Medical Center, Augsburg, Germany
| | - Michael Weichenthal
- Department of Dermatology, Venereology and Allergology, Schleswig-Holstein University Medical Center, Kiel, Germany
| | - Susanne Wiegand
- Department of Otolaryngology, Leipzig University Medical Center, Leipzig, Germany
| | - Roland Kaufmann
- Department of Dermatology, Venereology and Allergology, Frankfurt University Medical Center, Frankfurt, Germany
| | - Stephan Grabbe
- Department of Dermatology, Mainz University Medical Center, Mainz, Germany
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Lesiak A, Sobolewska-Sztychny D, Bednarski IA, Wódz K, Sobjanek M, Woźniacka A, Narbutt J. Alternative activation of hedgehog pathway induced by ultraviolet B radiation: preliminary study. Clin Exp Dermatol 2018; 43:518-524. [PMID: 29424103 DOI: 10.1111/ced.13394] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/31/2017] [Indexed: 11/28/2022]
Abstract
BACKGROUND There is still much ambiguity in studies of Sonic hedgehog (Shh) pathways and its dysregulation. Some studies concerning the role of the Shh pathway in basal cell carcinoma (BCC) have been conducted, but there is a lack of studies about Shh pathway dysregulation under the influence of ultraviolet (UV)B radiation. AIM To evaluate skin expression of Shh, Ptch1, Ptch2, Smo and Gli1 proteins in BCCs with and without the influence of UVB radiation. METHODS In total, 34 healthy controls (HCs) and 42 patients with nodular BCC were recruited into the study. Patients were divided into five groups (A-E), depending on UVB dose received and BCC status. In all skin specimens, expression of Shh, Ptch1, Ptch2, Smo and Gli1 protein was evaluated. RESULTS Comparing the BCC group with the HC group, there was significantly higher expression of Shh, Ptch1, Ptch2, Smo and Gli1 proteins. Expression of Ptch2, Smo and Gli1 was increased in response to UVB doses of 3 MED (minimal erythema dose), whereas expression of Ptch1 and Shh was unaffected. CONCLUSION The lack of change in expression of Shh and Ptch1 after exposure to UVB suggests that the Shh pathway may be activated through a noncanonical pathway under the influence of strong UVB doses.
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Affiliation(s)
- A Lesiak
- Department of Dermatology and Pediatric and Oncologic Dermatology, Medical University of Łódź, Łódź, Poland
| | | | - I A Bednarski
- Student Research Group at Department of Dermatology and Venereology, Medical University of Łódź, Łódź, Poland
| | - K Wódz
- Department of Experimental Immunology, Medical University of Łódź, Łódź, Poland
| | - M Sobjanek
- Department of Dermatology and Venereology, Medical University of Gdańsk, Gdańsk, Poland
| | - A Woźniacka
- Department of Dermatology and Venereology, Medical University of Łódź, Łódź, Poland
| | - J Narbutt
- Department of Dermatology and Pediatric and Oncologic Dermatology, Medical University of Łódź, Łódź, Poland
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Gache Y, Brellier F, Rouanet S, Al-Qaraghuli S, Goncalves-Maia M, Burty-Valin E, Barnay S, Scarzello S, Ruat M, Sevenet N, Avril MF, Magnaldo T. Basal Cell Carcinoma in Gorlin's Patients: a Matter of Fibroblasts-Led Protumoral Microenvironment? PLoS One 2015; 10:e0145369. [PMID: 26694869 PMCID: PMC4687848 DOI: 10.1371/journal.pone.0145369] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 12/01/2015] [Indexed: 11/18/2022] Open
Abstract
Basal cell carcinoma (BCC) is the commonest tumor in human. About 70% sporadic BCCs bear somatic mutations in the PATCHED1 tumor suppressor gene which encodes the receptor for the Sonic Hedgehog morphogen (SHH). PATCHED1 germinal mutations are associated with the dominant Nevoid Basal Cell Carcinoma Syndrome (NBCCS), a major hallmark of which is a high susceptibility to BCCs. Although the vast majority of sporadic BCCs arises exclusively in sun exposed skin areas, 40 to 50% BCCs from NBCCS patients develop in non photo-exposed skin. Since overwhelming evidences indicate that microenvironment may both be modified by- and influence the- epithelial tumor, we hypothesized that NBCCS fibroblasts could contribute to BCCs in NBCCS patients, notably those developing in non photo-exposed skin areas. The functional impact of NBCCS fibroblasts was then assessed in organotypic skin cultures with control keratinocytes. Onset of epidermal differentiation was delayed in the presence of primary NBCCS fibroblasts. Unexpectedly, keratinocyte proliferation was severely reduced and showed high levels of nuclear P53 in both organotypic skin cultures and in fibroblast-led conditioning experiments. However, in spite of increased levels of senescence associated β-galactosidase activity in keratinocytes cultured in the presence of medium conditioned by NBCCS fibroblasts, we failed to observe activation of P16 and P21 and then of bona fide features of senescence. Constitutive extinction of P53 in WT keratinocytes resulted in an invasive phenotype in the presence of NBCCS fibroblasts. Finally, we found that expression of SHH was limited to fibroblasts but was dependent on the presence of keratinocytes. Inhibition of SHH binding resulted in improved epidermal morphogenesis. Altogether, these data suggest that the repertoire of diffusible factors (including SHH) expressed by primary NBCCS fibroblasts generate a stress affecting keratinocytes behavior and epidermal homeostasis. Our findings suggest that defects in dermo/epidermal interactions could contribute to BCC susceptibility in NBCCS patients.
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Affiliation(s)
- Yannick Gache
- INSERM U1081—CNRS UMR7284 –UNS, Nice, France
- Université de Nice–Sophia-Antipolis, Faculté de Médecine, Nice, France
| | - Florence Brellier
- CNRS FRE2939, Université de Paris Sud—Institut Gustave Roussy, Villejuif, France
| | - Sophie Rouanet
- INSERM U1081—CNRS UMR7284 –UNS, Nice, France
- Université de Nice–Sophia-Antipolis, Faculté de Médecine, Nice, France
| | - Sahar Al-Qaraghuli
- INSERM U1081—CNRS UMR7284 –UNS, Nice, France
- Université de Nice–Sophia-Antipolis, Faculté de Médecine, Nice, France
| | - Maria Goncalves-Maia
- INSERM U1081—CNRS UMR7284 –UNS, Nice, France
- Université de Nice–Sophia-Antipolis, Faculté de Médecine, Nice, France
| | - Elodie Burty-Valin
- CNRS FRE2939, Université de Paris Sud—Institut Gustave Roussy, Villejuif, France
| | | | - Sabine Scarzello
- INSERM U1081—CNRS UMR7284 –UNS, Nice, France
- Université de Nice–Sophia-Antipolis, Faculté de Médecine, Nice, France
| | - Martial Ruat
- CNRS UMR9197, Neuroscience Paris-Saclay Institute, Gif‑sur‑Yvette, France
| | - Nicolas Sevenet
- INSERM U916 & Institut Bergonié, Laboratoire de génétique moléculaire, Bordeaux, France
| | | | - Thierry Magnaldo
- INSERM U1081—CNRS UMR7284 –UNS, Nice, France
- Université de Nice–Sophia-Antipolis, Faculté de Médecine, Nice, France
- * E-mail:
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8
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Kim W, Kim E, Yang HJ, Kwon T, Han S, Lee S, Youn H, Jung Y, Kang C, Youn B. Inhibition of hedgehog signalling attenuates UVB-induced skin photoageing. Exp Dermatol 2015; 24:611-7. [DOI: 10.1111/exd.12735] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/24/2015] [Indexed: 02/06/2023]
Affiliation(s)
- Wanyeon Kim
- Department of Biological Sciences; Pusan National University; Busan South Korea
- Nuclear Science Research Institute; Pusan National University; Busan South Korea
| | - EunGi Kim
- Department of Integrated Biological Science; Pusan National University; Busan South Korea
| | - Hee Jung Yang
- Department of Biological Sciences; Pusan National University; Busan South Korea
| | - TaeWoo Kwon
- Department of Integrated Biological Science; Pusan National University; Busan South Korea
| | - SeoYoung Han
- Department of Integrated Biological Science; Pusan National University; Busan South Korea
| | - Sungmin Lee
- Department of Integrated Biological Science; Pusan National University; Busan South Korea
| | - HyeSook Youn
- Department of Biological Sciences; Pusan National University; Busan South Korea
- Nuclear Science Research Institute; Pusan National University; Busan South Korea
| | - Youngmi Jung
- Department of Biological Sciences; Pusan National University; Busan South Korea
- Department of Integrated Biological Science; Pusan National University; Busan South Korea
| | - ChulHee Kang
- Department of Chemistry; Washington State University; Pullman Washington USA
| | - BuHyun Youn
- Department of Biological Sciences; Pusan National University; Busan South Korea
- Nuclear Science Research Institute; Pusan National University; Busan South Korea
- Department of Integrated Biological Science; Pusan National University; Busan South Korea
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Lim DY, Lee MH, Shin SH, Chen H, Ryu J, Shan L, Li H, Bode AM, Zhang WD, Dong Z. (+)-2-(1-Hydroxyl-4-oxocyclohexyl) ethyl caffeate suppresses solar UV-induced skin carcinogenesis by targeting PI3K, ERK1/2, and p38. Cancer Prev Res (Phila) 2014; 7:856-65. [PMID: 24845061 DOI: 10.1158/1940-6207.capr-13-0286] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
For decades, skin cancer incidence has increased, mainly because of oncogenic signaling pathways activated by solar ultraviolet (UV) irradiation (i.e., sun exposure). Solar UV induces multiple signaling pathways that are critical in the development of skin cancer, and therefore the development of compounds capable of targeting multiple molecules for chemoprevention of skin carcinogenesis is urgently needed. Herein, we examined the chemopreventive effects and the molecular mechanism of (+)-2-(1-hydroxyl-4-oxocyclohexyl) ethyl caffeate (HOEC), isolated from Incarvillea mairei var. grandiflora (Wehrhahn) Grierson. HOEC strongly inhibited neoplastic transformation of JB6 Cl41 cells without toxicity. PI3K, ERK1/2, and p38 kinase activities were suppressed by direct binding with HOEC in vitro. Our in silico docking data showed that HOEC binds at the ATP-binding site of each kinase. The inhibition of solar UV-induced PI3K, ERK1/2, and p38 kinase activities resulted in suppression of their downstream signaling pathways and AP1 and NF-κB transactivation in JB6 cells. Furthermore, topical application of HOEC reduced skin cancer incidence and tumor volume in SKH-1 hairless mice chronically exposed to solar UV. In summary, our results show that HOEC exerts inhibitory effects on multiple kinase targets and their downstream pathways activated by solar UV in vitro and in vivo. These findings suggest that HOEC is a potent chemopreventive compound against skin carcinogenesis caused by solar UV exposure.
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Affiliation(s)
- Do Young Lim
- The Hormel Institute, University of Minnesota, Austin, Minnesota
| | - Mee-Hyun Lee
- The Hormel Institute, University of Minnesota, Austin, Minnesota
| | - Seung Ho Shin
- The Hormel Institute, University of Minnesota, Austin, Minnesota; Program in Biomedical Informatics and Computational Biology, University of Minnesota, Minneapolis, Minnesota
| | - Hanyoung Chen
- The Hormel Institute, University of Minnesota, Austin, Minnesota
| | - Joohyun Ryu
- The Hormel Institute, University of Minnesota, Austin, Minnesota
| | - Lei Shan
- Department of Natural Product Chemistry, Second Military Medical University
| | - Honglin Li
- School of Pharmacy, East China University of Science & Technology, Shanghai, PR China; and
| | - Ann M Bode
- The Hormel Institute, University of Minnesota, Austin, Minnesota
| | - Wei-Dong Zhang
- Department of Natural Product Chemistry, Second Military Medical University;
| | - Zigang Dong
- The Hormel Institute, University of Minnesota, Austin, Minnesota;
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10
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Syed DN, Afaq F, Mukhtar H. Differential activation of signaling pathways by UVA and UVB radiation in normal human epidermal keratinocytes. Photochem Photobiol 2012; 88:1184-90. [PMID: 22335604 DOI: 10.1111/j.1751-1097.2012.01115.x] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ultraviolet (UV) radiation from the solar spectrum is a major etiological factor for many cutaneous pathologies including cancer. By understanding changes in cell signaling pathways induced by UVA and UVB, novel strategies for prevention and treatment of UV-related pathologies could be developed. However, much of the information in the literature from various laboratories cannot cross talk because of difficulties associated with the use of ill-defined light sources and physiologically irrelevant light dosimetry. Herein, we have assessed the effect of exposure of normal human epidermal keratinocytes (NHEK) to UVA (2 and 4 J cm(-2)) or UVB (20 and 40 mJ cm(-2)) radiation. Employing western blot analysis, we found that exposure of NHEK to UVB, but not UVA, phosphorylates JNK1/2 at Th(183)/Tyr(185), STAT3 at Ser(727) , AKT at Ser(473) and increases c-Fos expression, whereas exposure to UVA, but not UVB, phosphorylates AKT at Thr(308). UVB as well as UVA exposure leads to increased phosphorylation of (1) ERK1/2 at Th(202)/Tyr(204); (2) p38 at Th(180)/Tyr(204); (3) STAT3 at Tyr(705); (4) mTOR at Thr(2448); and (v) p70S6k at Thr(421) /Ser(424); enhanced expression of PI3K (p85) and c-jun; and nuclear translocation of NFκB proteins. These findings could be considered as a beginning for understanding the differential effects of UVA and UVB in the human skin and may have implications both with respect to risk assessment from exposure to solar UV radiation, and to target interventions against signaling events mediated by UVA and UVB.
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Affiliation(s)
- Deeba N Syed
- Department of Dermatology, University of Wisconsin, Madison, WI, USA
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11
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Yan Y, Xu H, Peng S, Zhao W, Wang B. Proteome analysis of ultraviolet-B-induced protein expression in vitro human dermal fibroblasts. PHOTODERMATOLOGY PHOTOIMMUNOLOGY & PHOTOMEDICINE 2011; 26:318-26. [PMID: 21091790 DOI: 10.1111/j.1600-0781.2010.00556.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
BACKGROUND Ultraviolet-B (UVB) radiation can result in acute photodamage, photoaging and skin cancer through the induction of reactive oxygen species, DNA damage, activation of signaling pathways, and regulation of gene expression. In this study, we investigated UVB-induced alterations in protein expression in human dermal fibroblasts. METHODS Skin fibroblasts were irradiated with 100 mJ/cm² UVB, and cell viability was monitored by the 3-(4,5)-dimethylthiahiazo(-z-y1)-3,5-diphenytetrazoliumromide assay. Two-dimensional gel electrophoresis and matrix-assisted laser desorption/ionization time of flight mass spectroscopy were used to identify differentially expressed proteins. The mRNA and levels of identified proteins were detected using a quantitative real-time polymerase chain reaction assay and Western blot. RESULTS UVB decreased the viability of skin fibroblasts. In UVB-treated cells, eighteen differentially expressed proteins were identified. Among these proteins, the amounts of receptor-interacting protein (RIP) and vimentin were significantly up-regulated. However, their mRNA levels decreased and remained relatively stable, respectively. CONCLUSIONS The differential expression of RIP and vimentin was validated in UVB-irradiated fibroblasts. RIP may promote cell injury, and vimentin may contribute to the resistance of cells to UVB-induced damage.
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Affiliation(s)
- Yan Yan
- Department of Dermatology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
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12
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Brellier F, Valin A, Chevallier-Lagente O, Gorry P, Avril MF, Magnaldo T. Ultraviolet responses of Gorlin syndrome primary skin cells. Br J Dermatol 2008; 159:445-52. [DOI: 10.1111/j.1365-2133.2008.08650.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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13
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Gosselet FP, Magnaldo T, Culerrier RM, Sarasin A, Ehrhart JC. BMP2 and BMP6 control p57Kip2 expression and cell growth arrest/terminal differentiation in normal primary human epidermal keratinocytes. Cell Signal 2007; 19:731-9. [PMID: 17112701 DOI: 10.1016/j.cellsig.2006.09.006] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2006] [Accepted: 09/16/2006] [Indexed: 01/02/2023]
Abstract
Functional studies of the canonical Bone Morphogenetic Protein (BMP) signalling pathway in human epidermal keratinocytes have been limited to the immortalized and p53-mutated HaCaT cells and are primarily dependent on BMP6 treatment in mouse epidermal keratinocytes. Despite these insightful analyses, the molecular mechanism underlying the role of BMP signalling in the precise balance between growth arrest and terminal differentiation of keratinocytes still remains not clearly defined. The current study first investigated the hitherto uncharacterized status and functions of BMP signalling in normal human keratinocytes by using three independent strains of primary interfollicular epidermal keratinocytes. Then we provided data demonstrating the role of BMP2 compared to BMP6 in the inhibition of growth and induction of subsequent terminal differentiation of these cells. A second relevant finding is based on the clonal analysis of colony types present in untreated and BMP2/6-treated cultures in absence of EGF. BMP treatment results in the clonal transition from proliferative to abortive colonies, suggesting that BMP signalling most likely inhibits stem cell proliferation and triggers cell cycle exit from transit amplifying cells. Third, we showed evidence that, of the three members of the Cip/Kip family of cyclin-dependent kinase inhibitors, only p57(Kip2) and p21(Cip1) have a BMP2/6-induced expression. One mechanism of inhibition of cell proliferation involves p57(Kip2) as an immediate early response, in contradistinction with p21(Cip1) which largely depends on de novo protein synthesis for its effect to proceed. All together, these results clarify the BMP signalling status in normal primary human keratinocytes and support a new mechanism of inhibition of the proliferation of interfollicular epidermal keratinocytes coupled with induction of their terminal differentiation following BMP2 or BMP6 addition.
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Affiliation(s)
- Fabien P Gosselet
- Laboratory of Genomes and Cancers, FRE 2939 CNRS, Institut Gustave Roussy-PR2, 39 rue Camille Desmoulins, 94805 Villejuif, France
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14
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Norval M, Cullen AP, de Gruijl FR, Longstreth J, Takizawa Y, Lucas RM, Noonan FP, van der Leun JC. The effects on human health from stratospheric ozone depletion and its interactions with climate change. Photochem Photobiol Sci 2007; 6:232-51. [PMID: 17344960 DOI: 10.1039/b700018a] [Citation(s) in RCA: 117] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Ozone depletion leads to an increase in the ultraviolet-B (UV-B) component (280-315 nm) of solar ultraviolet radiation (UVR) reaching the surface of the Earth with important consequences for human health. Solar UVR has many harmful and some beneficial effects on individuals and, in this review, information mainly published since the previous report in 2003 (F. R. de Gruijl, J. Longstreth, M. Norval, A. P. Cullen, H. Slaper, M. L. Kripke, Y. Takizawa and J. C. van der Leun, Photochem. Photobiol. Sci., 2003, 2, pp. 16-28) is discussed. The eye is exposed directly to sunlight and this can result in acute or long-term damage. Studying how UV-B interacts with the surface and internal structures of the eye has led to a further understanding of the location and pathogenesis of a number of ocular diseases, including pterygium and cataract. The skin is also exposed directly to solar UVR, and the development of skin cancer is the main adverse health outcome of excessive UVR exposure. Skin cancer is the most common form of malignancy amongst fair-skinned people, and its incidence has increased markedly in recent decades. Projections consistently indicate a further doubling in the next ten years. It is recognised that genetic factors in addition to those controlling pigment variation can modulate the response of an individual to UVR. Several of the genetic factors affecting susceptibility to the development of squamous cell carcinoma, basal cell carcinoma and melanoma have been identified. Exposure to solar UVR down-regulates immune responses, in the skin and systemically, by a combination of mechanisms including the generation of particularly potent subsets of T regulatory cells. Such immunosuppression is known to be a crucial factor in the generation of skin cancers. Apart from a detrimental effect on infections caused by some members of the herpesvirus and papillomavirus families, the impact of UV-induced immunosuppression on other microbial diseases and vaccination efficacy is not clear. One important beneficial effect of solar UV-B is its contribution to the cutaneous synthesis of vitamin D, recognised to be a crucial hormone for bone health and for other aspects of general health. There is accumulating evidence that UVR exposure, either directly or via stimulation of vitamin D production, has protective effects on the development of some autoimmune diseases, including multiple sclerosis and type 1 diabetes. Adequate vitamin D may also be protective for the development of several internal cancers and infections. Difficulties associated with balancing the positive effects of vitamin D with the negative effects of too much exposure to solar UV-B are considered. Various strategies that can be adopted by the individual to protect against excessive exposure of the eye or the skin to sunlight are suggested. Finally, possible interactions between ozone depletion and climate warming are outlined briefly, as well as how these might influence human behaviour with regard to sun exposure.
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Affiliation(s)
- M Norval
- Medical Microbiology, University of Edinburgh Medical School, Teviot Place, Edinburgh, EH8 9AG, Scotland
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15
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Breitbart EW, Greinert R, Volkmer B. Effectiveness of information campaigns. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2006; 92:167-72. [PMID: 16595143 DOI: 10.1016/j.pbiomolbio.2006.02.023] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Skin cancer represents the most common type of cancer in the white population worldwide and the incidence has dramatically increased during the last decades. UV-radiation is believed to be the most important risk factor responsible for this trend. The prominent role of UV-radiation renders skin cancer most suitable for primary prevention, because the main risk factor can easily be avoided by sticking to simple rules for the behaviour in the sun or under artificial UV (e.g. sunbeds). Since UV-exposure cannot and should not be avoided totally especially due to the beneficial health effects of UV-irradiation like Vitamin D(3)-production, recommendations and information for the public should be as clear and as weighted as possible, through adequate messages, such as: "Love the sun and protect your skin". For that purpose the Association of Dermatological Prevention in Germany (ADP) developed the period of life programme (POLP) that defines certain age-specific target groups, with the aim to give well adapted prevention messages to the population during lifetime. Evaluation of primary prevention campaigns in Germany showed that due to continuous intervention programs during the last 16 years changes in the "sun-behaviour" of the population have been achieved leading to a reduced but sufficient exposure to solar UV-irradiation. This will then contribute to the aim of decreasing morbidity and mortality of skin cancer.
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Affiliation(s)
- E W Breitbart
- Dermatology Center, Elbeklinikum Buxtehude, Am Krankenhaus 1, 21614 Buxtehude, Germany.
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16
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Fujimoto M, Kitazawa R, Maeda S, Kitazawa S. Methylation adjacent to negatively regulating AP-1 site reactivates TrkA gene expression during cancer progression. Oncogene 2005; 24:5108-18. [PMID: 15870692 DOI: 10.1038/sj.onc.1208697] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Nerve growth factor and its high-affinity receptor TrkA are thought to be involved in the progression of various cancers. This study investigated the mechanism that regulates aberrant or increased TrkA expression in various cancer cell lines and in the course of pancreatic cancer progression. We found that the negative cis-acting AP-1-like sequence TGAGCGA was located in the 5'-untranslated region of the TrkA gene. Sodium bisulfite mapping revealed that steady-state TrkA expression correlated positively with the accumulation of methylated CpG around the AP-1-like site. Electrophoretic mobility shift assay showed that the AP-1-like site was bound mainly by c-Jun homodimers; the binding was directly blocked by Sss I methylase-induced methylation or by an excess of oligonucleotides containing consensus AP-1 sequences. Consequently, activation of TrkA gene expression by methylation was considered to be caused by the direct interference of c-Jun binding to the negatively regulating AP-1-like site. Furthermore, the accumulation of methylated CpG around the AP-1-like site was also observed with increased TrkA immunohistochemical staining in cases of advanced pancreatic adenocarcinoma with extensive perineural invasion. Unlike global methylation at CpG islands that leads to gene silencing, specific methylation at non-CpG islands would play a crucial epigenetic role in the versatility and plasticity of TrkA expression during cancer progression.
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Affiliation(s)
- Masayo Fujimoto
- 1Division of Molecular Pathology, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan
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17
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Simbulan-Rosenthal CM, Trabosh V, Velarde A, Chou FP, Daher A, Tenzin F, Tokino T, Rosenthal DS. Id2 protein is selectively upregulated by UVB in primary, but not in immortalized human keratinocytes and inhibits differentiation. Oncogene 2005; 24:5443-58. [PMID: 16007217 DOI: 10.1038/sj.onc.1208709] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Solar ultraviolet B (UVB) acts as both an initiator and promoter in models of multistage skin carcinogenesis. We found that, whereas UVB induces apoptosis in human papillomavirus-16 E6/7-immortalized keratinocytes, it inhibits markers of differentiation in human foreskin keratinocytes (HFK). Potential mechanisms for this differential response were examined by DNA microarray, which revealed that UVB alters the expression of three of the four human inhibitor of differentiation/DNA binding (Id) proteins that comprise a class of helix-loop-helix family of transcription factors involved in proliferation, differentiation, apoptosis, and carcinogenesis. These results were verified by RT-PCR and immunoblot analysis of control and UVB-irradiated primary and immortalized keratinocytes. Whereas Id1 was downregulated in both cell types, Id2 expression was upregulated in primary HFK, but not immortalized cells. In contrast, Id3 expression was significantly increased only in immortalized cells. The differential expression pattern of Id2 in response to UVB was recapitulated in reporter constructs containing the 5' regulatory regions of this gene. Id2 promoter activity increased in response to UVB in HFK, but not in immortalized cells. To identify the regulatory elements in the Id2 promoter that mediate transcriptional activation by UVB in HFK, promoter deletion/mutation analysis was performed. Deletion analysis revealed that transactivation involves a 166 bp region immediately upstream to the Id2 transcriptional start site and is independent of c-Myc. The consensus E twenty-six (ETS) binding site at -120 appears to mediate UVB transcriptional activation of Id2 because point mutations at this site completely abrogated this response. Chromatin immunoprecipitation and electrophoretic mobility-shift assays verified that the Id2 promoter interacts with known Id2 promoter (ETS) binding factors Erg1/2 and Fli1, but not with c-Myc; and this interaction is enhanced after UVB exposure. Similar to the effects of UVB exposure, ectopic expression of Id2 protein in primary HFK resulted in inhibition of differentiation, as shown by decreased levels of the terminal differentiation marker keratin K1 and inhibition of involucrin crosslinking. Reduction of Id2 expression by small interfering RNAs attenuated the UVB-induced inhibition of differentiation in these cells. These results suggest that UVB-induced inhibition of differentiation of primary HFK is at least, in part, due to the upregulation of Id2, and that upregulation of Id2 by UVB might predispose keratinocytes to carcinogenesis by preventing their normal differentiation program.
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Affiliation(s)
- Cynthia M Simbulan-Rosenthal
- Department of Biochemistry and Molecular Biology, Georgetown University, School of Medicine, Washington, DC 20007, USA
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Reifenberger J. [Hereditary tumor syndromes. Cutaneous manifestations and molecular pathogenesis of Gorlin and Cowden syndromes]. Hautarzt 2004; 55:942-51. [PMID: 15349693 DOI: 10.1007/s00105-004-0800-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Several hereditary tumor syndromes are associated with characteristic skin lesions which may facilitate an early diagnosis. We summarize clinical features and recent progress in understanding the etiology and pathogenesis of two selected tumor syndromes, namely nevoid basal cell carcinoma syndrome (Gorlin syndrome) and Cowden syndrome. Both are autosomal dominantly inherited disorders. Nevoid basal cell carcinoma syndrome is characterized by the early onset of multiple basal cell carcinomas as as well as developmental defects and a predisposition for other benign and malignant tumors. The syndrome is caused by germline mutations in the PTCH tumor suppressor gene. Cowden syndrome is associated with pathognomonic mucocutaneous lesions, such as facial trichilemmomas, acral keratoses, and mucocutaneous papillomatosis. In addition, Cowden patients are predisposed to carcinomas of the thyroid, breast and endometrium. Cowden syndrome is caused by germline mutations in the PTEN tumor suppressor gene. Identification of the genes causing hereditary tumor syndromes as well as generation of genetically engineered mouse models have greatly advanced our understanding of the molecular pathogenesis of these diseases. Furthermore, novel pathogenesis-based pharmacological strategies are being developed that promise to improve prevention and therapy.
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