neoplasm
N |
• untreated mice are viable and reach adulthood with no development of spontaneous skin tumors
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• in a 2-stage DMBA/TPA skin carcinogenesis model, papilloma formation is delayed by ~3 weeks, tumor multiplicity is strongly reduced, and tumors that do form grow slower than in similarly treated wild-type controls
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• in a 2-stage DMBA/TPA skin carcinogenesis model, mice show increased incidence of keratoacanthomas (KAs) with typical crater-like morphology, broad tumor base and a keratin-filled center, and tumor sizes that reach >1 cm by 22 weeks post-initiation requiring termination
• at termination, 91% of DMBA/TPA mice are KA-positive versus 27% of wild-type controls
• however, incidence of squamous cell carcinomas (SCCs) is relatively normal
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• 45% of the relatively small papillomas found in in DMBA/TPA-treated mice show local invasion of tumor cells into the stroma versus 33% of the abundant larger papillomas found in wild-type controls
• 36% of keratoacanthomas (KAs) found in in DMBA/TPA-treated show local invasion into the stroma versus 0% of the KAs found in wild-type controls
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• in response to DMBA/TPA treatment, papillomas that form grow slower than in wild-type controls
• at 14.5 weeks post-DMBA treatment, average papilloma size is significantly smaller than that in wild-type controls
• epidermal cell proliferation is significantly reduced, whereas epidermal apoptosis is significantly increased relative to wild-type controls
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• at 22 weeks post-DMBA treatment, keratoacanthomas reach an average size of >1 cm, unlike in wild-type controls
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• DMBA/TPA-treated mice show accelerated appearance of keratoacanthomas relative to wild-type controls, with KAs first detected at 7 weeks post-DMBA treatment
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• in DMBA/TPA-treated mice, papilloma formation is delayed by ~3 weeks relative to wild-type controls
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homeostasis/metabolism
• in a 2-stage DMBA/TPA skin carcinogenesis model, papilloma formation is delayed by ~3 weeks, tumor multiplicity is strongly reduced, and tumors that do form grow slower than in similarly treated wild-type controls
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• in a 2-stage DMBA/TPA skin carcinogenesis model, mice show increased incidence of keratoacanthomas (KAs) with typical crater-like morphology, broad tumor base and a keratin-filled center, and tumor sizes that reach >1 cm by 22 weeks post-initiation requiring termination
• at termination, 91% of DMBA/TPA mice are KA-positive versus 27% of wild-type controls
• however, incidence of squamous cell carcinomas (SCCs) is relatively normal
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