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Figure 2
Altered epidermal growth and differentiation in  K5-M2SMO transgenic mice. Epidermal hyperplasia (B) was seen in several K5-M2SMO founders, when compared with age-matched controls (A). epi, epidermis; derm, dermis; hf, hair follicle. Epidermal basal cells in some regions of K5-M2SMO mouse skin were crowded together and elongated (D) in a pattern resembling the peripheral palisading characteristically seen at the edge of human BCC tumor nodules (C). Altered growth and differentiation in skin from K5-M2SMO mice (F, H, J, L, N and P) compared with littermate controls (E, G, I, K, M and O). Note the thickened epidermis and expansion of basal layer-like cells into upper strata (E and F). Expression of K5 is limited to the basal layer in control epidermis (G), but is expressed in multiple suprabasal cell layers in epidermis of K5-M2SMO mice (H). The inset in (G) illustrates normal K5 expression largely limited to the basal layer compartment, even in hyperplastic newborn mouse epidermis. bas, basal cell layer; spin, spinous layers; gran, granular cell layers; cor, cornified cells. The appearance of the suprabasal cell marker K10 is delayed in K5-M2SMO mice (J) compared with controls (I). The inset in (I) shows a normal K10 expression pattern in all suprabasal cell layers of newborn mouse epidermis, but not in the basal cell layer. The dashed line indicates basement membrane separating the epidermis from the dermis. K17 is ectopically expressed in epidermis of K5-M2SMO mice (L) but not controls (K), which exhibit expression limited to the hair follicle outer root sheath. K6 is expressed in the same subset of hair follicle keratinocytes in control (M) and transgenic (N) skin sections. Increased proliferation in K5-M2SMO mouse epidermis (O and P). Note the increased number of BrdU-labeled nuclei (arrowheads) in transgenic (P) versus control (O) mouse skin. BrdU-labeled nuclei and mitotic figures (inset) are seen in suprabasal layers of K5-M2SMO epidermis (P).
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