title: EVER proteins, key elements of the natural anti-human papillomavirus barrier, are regulated upon T-cell activation.
abstract: Human papillomaviruses (HPV) cause a variety of mucosal and skin lesions ranging from benign proliferations to invasive carcinomas. The clinical manifestations of infection are determined by host-related factors that define the natural anti-HPV barrier. Key elements of this barrier are the EVER1 and EVER2 proteins, as deficiency in either one of the EVER proteins leads to Epidermodysplasia Verruciformis (EV), a genodermatosis associated with HPV-induced skin carcinoma. Although EVERs have been shown to regulate zinc homeostasis in keratinocytes, their expression and function in other cell types that may participate to the anti-HPV barrier remain to be investigated. In this work, we demonstrate that EVER genes are expressed in different tissues, and most notably in lymphocytes. Interestingly, in contrast to the skin, where EVER2 transcripts are hardly detectable, EVER genes are both abundantly expressed in murine and human T cells. Activation of CD4+ and CD8+ T cells via the TCR triggers a rapid and profound decrease in EVER expression, accompanied by an accumulation of free Zn(2+) ions. Thus, EVER proteins may be involved in the regulation of cellular zinc homeostasis in lymphocytes. Consistent with this hypothesis, we show that the concentration of Zn(2+) ions is elevated in lymphoblastoid cells or primary T cells from EVER2-deficient patients. Interestingly, we also show that Zn(2+) excess blocks T-cell activation and proliferation. Therefore, EVER proteins appear as key components of the activation-dependent regulation of Zn(2+) concentration in T cells. However, the impact of EVER-deficiency in T cells on EV pathogenesis remains to be elucidated.
authors: Inserm, U1043, Toulouse, France.
authors: Maciej
authors: M
authors: Lazarczyk
authors: Cécile
authors: C
authors: Dalard
authors: Myriam
authors: M
authors: Hayder
authors: Loïc
authors: L
authors: Dupre
authors: Béatrice
authors: B
authors: Pignolet
authors: Slawomir
authors: S
authors: Majewski
authors: Francoise
authors: F
authors: Vuillier
authors: Michel
authors: M
authors: Favre
authors: Roland S
authors: RS
authors: Liblau
mesh_terms: D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D017931:DNA Primers; D005260:Female; D006801:Humans; D008213:Lymphocyte Activation; D008565:Membrane Proteins / Q000235:genetics / Q000502:physiology*; D051379:Mice; D008807:Mice, Inbred BALB C; D027383:Papillomaviridae / Q000276:immunology*; D016133:Polymerase Chain Reaction; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D017931:DNA Primers; D008565:Membrane Proteins; C470314:TMC6 protein, human; C470315:TMC8 protein, human