UV‐B‐type mutations and chromosomal imbalances indicate common pathways for the development of Merkel and skin squamous cell carcinomas

Popp, Susanne; Waltering, Stefan; Herbst, Curt; Moll, Ingrid; Boukamp, Petra

doi:10.1002/ijc.10321

Cited by 184 publications

(169 citation statements)

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“…These cells represent an early stage of skin carcinogenesis because they harbor UVB type-specific p53 mutations (Lehman et al, 1993) as well as some chromosomal abnormalities typical for human skin SCCs (Lehman et al, 1993;Boukamp et al, 1997;Popp et al, 2002). While the HaCaT cells remained nontumorigenic through long-term passaging, they became tumorigenic by transduction with the Harvey-ras oncogene, increased temperature or stroma modulating growth factors known to be relevant for tumorigenicity (Boukamp et al, 1990b(Boukamp et al, , 1995(Boukamp et al, , 1997Skobe and Fusenig, 1998;Obermueller et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

UVA radiation causes DNA strand breaks, chromosomal aberrations and tumorigenic transformation in HaCaT skin keratinocytes

et al. 2008

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The role of UVA-radiation-the major fraction in sunlight-in human skin carcinogenesis is still elusive. We here report that different UVA exposure regime (4 Â 5 J/cm 2 per week or 1 Â 20 J/cm 2 per week) caused tumorigenic conversion (tumors in nude mice) of the HaCaT skin keratinocytes. While tumorigenicity was not associated with general telomere shortening, we found new chromosomal changes characteristic for each recultivated tumor. Since this suggested a nontelomere-dependent relationship between UVA irradiation and chromosomal aberrations, we investigated for alternate mechanisms of UVA-dependent genomic instability. Using the alkaline and neutral comet assay as well as c-H2AX foci formation on irradiated HaCaT cells (20-60 J/cm 2 ), we show a dosedependent and long lasting induction of DNA single and double (ds) strand breaks. Extending this to normal human skin keratinocytes, we demonstrate a comparable damage response and, additionally, a significant induction and maintenance of micronuclei (MN) with more acentric fragments (indicative of ds breaks) than entire chromosomes particularly 5 days post irradiation. Thus, physiologically relevant UVA doses cause long-lasting DNA strand breaks, a prerequisite for chromosomal aberration that most likely contribute to tumorigenic conversion of the HaCaT cells. Since normal keratinocytes responded similarly, UVA may likewise contribute to the complex karyotype characteristic for human skin carcinomas.

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Section: Introductionmentioning

confidence: 99%

UVA radiation causes DNA strand breaks, chromosomal aberrations and tumorigenic transformation in HaCaT skin keratinocytes

et al. 2008

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“…No significant association was found between p16/p14 expression and mutation status or type of mutation. It is known that other mechanisms than mutations can cause aberrant expression of p16 and p14, such as loss of parts or the entire short arm of chromosome 9 [33][34][35] or epigenetic events like hypermethylation. 36 However, for p53, a significant association was present between p53 expression and type of mutation, with missense mutations being associated with positive staining, and nonsense and frame shift mutations with negative staining (p ¼ 0.002).…”

Section: Discussionmentioning

confidence: 99%

CDKN2A but not TP53 mutations nor HPV presence predict poor outcome in metastatic squamous cell carcinoma of the skin

Küsters‐Vandevelde

Leeuwen

Verdijk

et al. 2009

Intl Journal of Cancer

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Genetic alterations in metastatic cutaneous squamous cell carcinoma (CSCC) which might serve as prognostic biomarkers are not well investigated. We investigated the mutation status and protein expression of the CDKN2A (INK4a-ARF) and TP53 genes in metastatic CSCCs and correlated this with clinicopathological variables, HPV presence, and survival data. Sequence analysis was performed on formalin-fixed and paraffin-embedded tissue of 35 metastases and their primary tumors, and was correlated with immunohistochemical stainings for p53, p16 and p14. Beta-PV and alpha-PV DNA was detected using PCRbased assays. Kaplan-Meier and Cox regression methods were used for survival assessment. CDKN2A was mutated in 31% of the metastases and their primary tumors, while the TP53 gene was mutated in 51% of the metastases. P53 protein expression was significantly associated with missense type of mutations (p 5 0.002). No persistent HPV types were detected. CDKN2A mutations were significantly associated with disease-specific death (p 5 0.001). A significant difference was observed in disease-specific survival between patients with or without a CDKN2A mutation (p 5 0.010), while this was not the case for TP53. At univariate Cox's regression analysis tumor size (p 5 0.010), invasion depth (p 5 0.030) and CDKN2A mutations (p 5 0.040) were significantly related to shorter disease-specific survival. At multivariate Cox's regression only tumor size had an adverse effect on survival (p 5 0.002). In conclusion, our study indicates that the CDKN2A mutation status might be of prognostic value in metastatic CSCCs. In most cases, CDKN2A and TP53 mutations are early genetic events in CSCC tumorigenesis. The possible role of HPV in metastatic CSCC needs further exploration.Cutaneous squamous cell carcinoma (CSCC) is the second most common malignancy in Caucasians, after basal cell carcinoma, and its incidence is still rising. 1 Generally the risk of metastasis is reported up to 5%, while immunocompromised patients have a larger tendency to metastasize (5-10%). 1,2 The outcome of these patients once metastasized is poor, with a 5-year survival rate between 25 and 50%. 3,4 Genetic alterations in CSCCs which might serve as prognostic biomarkers are not well investigated.TP53 mutations are the most frequent genetic alterations in CSCC with incidences of up to 50%. 5,6 TP53 mutations are early events in skin carcinogenesis, with a similar mutation frequency of 50% in actinic keratosis, a precancerous skin lesion that potentially can progress to CSCC. 7 Mutations in the CDKN2A (INK4a-ARF) locus are reported in CSCC with frequencies ranging up to 24% in sporadic CSCC. [8][9][10] This gene maps to chromosome 9p21, which by alternative transcripts encodes for 2 cell cycle regulatory proteins, p16 INK4a (Exons 1a, 2 and 3) and p14 ARF (Exons 1b, 2 and 3). 10,11 The exact role of the CDKN2A gene in skin carcinogenesis is not well understood. Especially in metastatic CSCCs alterations in the CDKN2A gene have not been investigated. In a small previous stud...

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“…30,31 Another previously observed recurrent abnormality is the entire or partial loss of 13q. In our samples, the most frequent losses of DNA sequence copy number were located at 13q13q31, which agree well with the results by others.…”

Section: Discussionmentioning

confidence: 99%

Recurrent DNA copy number changes revealed by comparative genomic hybridization in primary Merkel cell carcinomas

et al. 2004

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Comparative genomic hybridization (CGH) was used to search for gains, high-level amplifications and losses of DNA sequences along all chromosome arms in 19 primary Merkel cell carcinomas (MCC). Extensive genetic aberrations, with a mean value of 5.571.1 changes per tumor were detected in 13 out of the 19 samples analyzed. Our CGH results reveal several new and other previously known chromosomal regions that are involved in the pathogenesis of MCC. The majority of the alterations were gains of whole chromosomes or whole chromosome arms. Compared to losses, the frequency of DNA copy number gains was two-fold. DNA sequence copy number gains were most common in chromosomes 6 (42%), 1 (37%), and 5 (32%). The most frequent minimal common regions of gains were 6pterqter (42%), 1q11q31 (32%), and 5p (32%). No recurrent high-level amplifications were observed. High-level amplifications of small chromosomal regions were found in four samples out of the 19 tumors analyzed (21%). Amplifications affected 1q22q24 (5%), 4p (5%), and 5p (5%). Losses most frequently affected chromosomes 13 (21%) and 4 (16%). Minimal common regions with the most frequent losses were 13q13q31 (21%), 4q (16%), and 16q (11%). No significant statistical correlation between genomic aberrations and clinicopathological factors was revealed, despite the fact that there was an obvious tendency towards it. Primary MCC expressing DNA alterations were predominantly distinguished in large tumors, and risk of metastatic dissemination was three-fold compared to tumors with no DNA alterations.

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UV‐B‐type mutations and chromosomal imbalances indicate common pathways for the development of Merkel and skin squamous cell carcinomas

Cited by 184 publications

References 50 publications

UVA radiation causes DNA strand breaks, chromosomal aberrations and tumorigenic transformation in HaCaT skin keratinocytes

UVA radiation causes DNA strand breaks, chromosomal aberrations and tumorigenic transformation in HaCaT skin keratinocytes

CDKN2A but not TP53 mutations nor HPV presence predict poor outcome in metastatic squamous cell carcinoma of the skin

Recurrent DNA copy number changes revealed by comparative genomic hybridization in primary Merkel cell carcinomas

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