Background: Induction of α6β4 integrin in the differentiated epidermal cell layers in skin is a hallmark of human cutaneous squamous cell carcinoma (SCC) pathogenesis and stimulates chemically induced SCC formation in Invα6β4 transgenic mice, which exhibit persistent expression of α6β4 in the suprabasal epidermal layers. However, the molecular basis for the support of SCC development by suprabasal α6β4 is not fully understood.
Objective: We examined the relevance for suprabasal α6β4 expression in the epidermis for the recruitment of immunosuppressive leukocytes during the early stages of tumor promotion.