Previous studies have established that 7,12-dimethylbenz(a)anthracene (DMBA) can initiate skin tumourigenesis in conventional furred mouse models by acting on hair follicle stem cells. However, further cancer progression depends on repeated applications of tumour promoter agents. This study evaluated the timeline involved in skin tumourigenesis and progression in immunocompetent hairless SKH1-hr mice with dysfunctional hair follicles using only DMBA with no additional tumour promoter agents. The results showed that topical application of 30 μg (117 nmol) of DMBA over the back and flank regions of the mouse once a week and 15 μg (58.5 nmol) twice a week produced skin tumours after 7–8 weeks. However, by week 14 a heavy benign tumour load required the mice to be euthanized. Lowering the DMBA dose to 15 μg (58.5 nmol) once a week produced tumours more slowly and allowed the mice to be studied for a longer period to week 23. This lowdose DMBA regimen yielded a high percentage of malignant tumours (58.8%) after 23 weekly applications. Additionally DMBA-treated skin showed an increase in mean epidermal thickness in comparison to untreated and acetone-treated skin. Despite the aberrant hair follicles in SKH1-hr mice, this chemically driven skin cancer model in hairless mice can serve as a suitable alternative to the ultraviolet-induced skin cancer models and can be reliably replicated as demonstrated by both the pilot and main experiments.

Additional Metadata
Keywords Chemical carcinogenesis, Cutaneous squamous cell carcinoma, DMBA, Hairless mice, Skin cancer models
Persistent URL dx.doi.org/10.1177/0023677216637305, hdl.handle.net/1765/98416
Journal Laboratory Animals: the international journal of laboratory animal science and welfare
Rights No subscription
Citation
Thomas, G, Tuk, B, Song, J.-Y, Truong, H, Gerritsen, H.C, de Gruijl, F.R, & Sterenborg, H.J.C.M. (2017). Studying skin tumourigenesis and progression in immunocompetent hairless SKH1-hr mice using chronic 7,12-dimethylbenz(A)anthracene topical applications to develop a useful experimental skin cancer model. Laboratory Animals: the international journal of laboratory animal science and welfare, 51(1), 24–35. doi:10.1177/0023677216637305