The HBZ gene, a key player in HTLV-1 pathogenesis

Human T-cell leukemia virus type 1 (HTLV-1) causes adult T-cell leukemia/lymphoma (ATL) and is also associated with a variety of lymphocyte-mediated diseases. The HTLV-1 basic leucine zipper (HBZ) gene, found to be consistently expressed in ATL, has recently been the subject of intensive research efforts. In this review, we summarize recent findings about HBZ and discuss its roles and functions not only in the virus life cycle, but also in HTLV-1 disease pathogenesis

HTLV-1 bZIP Factor Induces T-Cell Lymphoma and Systemic Inflammation In Vivo

Human T-cell leukemia virus type 1 (HTLV-1) is the causal agent of a neoplastic disease of CD4+ T cells, adult T-cell leukemia (ATL), and inflammatory diseases including HTLV-1 associated myelopathy/tropical spastic paraparesis, dermatitis, and inflammatory lung diseases. ATL cells, which constitutively express CD25, resemble CD25+CD4+ regulatory T cells (Treg). Approximately 60% of ATL cases indeed harbor leukemic cells that express FoxP3, a key transcription factor for Treg cells. HTLV-1 encodes an antisense transcript, HTLV-1 bZIP factor (HBZ), which is expressed in all ATL cases. In this study, we show that transgenic expression of HBZ in CD4+ T cells induced T-cell lymphomas and systemic inflammation in mice, resembling diseases observed in HTLV-1 infected individuals. In HBZ-transgenic mice, CD4+Foxp3+ Treg cells and effector/memory CD4+ T cells increased in vivo. As a mechanism of increased Treg cells, HBZ expression directly induced Foxp3 gene transcription in T cells. The increased CD4+Foxp3+ Treg cells in HBZ transgenic mice were functionally impaired while their proliferation was enhanced. HBZ could physically interact with Foxp3 and NFAT, thereby impairing the suppressive function of Treg cells. Thus, the expression of HBZ in CD4+ T cells is a key mechanism of HTLV-1-induced neoplastic and inflammatory diseases

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W9 : Enquête d'actio

Revue Cancer letters.

Gaudray P : Editeur associé dans la revue Cancer letters

La Menin, un oncosuppresseur nucléaire au carrefour de la régulation, de la transcription et de la stabilité du génome.

National audienc

Les femmes porteuses : un don, une mission, un contrat ?

Table ronde au Lycée international de Saint-Germain-en-Lay

Avis n°106 : Questions éthiques soulevées par une possible pandémie grippale

Participation à la rédaction d'avis du Comité Consultatif National d'Ethiqu

Ethique et développement durable

Ministère de l'Ecologie, de l'Energie, du Développement Durable et de l'Aménagement du Territoir

Participation à la rédaction d'avis du Comité Consultatif National d'Ethique

Avis n°100 : Migration, filiation et identification par empreintes génétiques Avis n°103 : Ethique et surdité de l'enfant : éléments de réflexion à propos de l'information sur le dépistage systématique néonatal et la prise en charge des enfants sourds Avis n°104 : Le " dossier médical personnel " et l'informatisation des données de sant

Genetic background of MEN1: from genetic homogeneity to functional diversity.

International audienceMultiple Endocrine Neoplasia Type 1 corresponds to a monogenic predisposition syndrome inherited as a dominant trait that affects a variety of endocrine tissues, in particular parathyroids, endocrine pancreas and anterior pituitary. It is caused by mutations in the MEN1 tumor suppressor gene that inactivate menin, the MEN1 encoded protein. Menin is involved in cell cycle control and apoptosis through its participation in functional dynamics of chromatin and regulation of transcription. In addition, genetic investigations have implicated menin in the maintenance of genomic integrity. However, the role of menin does not--by far--end here. It plays (too) many roles in the control of cell life and normality, far beyond endocrine oncogenesis, making it unlikely that the function of menin can be deciphered only by genetic investigation. In this context, writing a chapter on the genetic background of MEN1 appears at the same time as a challenge and a paradox. A challenge as everything has been either already written on the topic or included in the present book. A paradox since genetics is simultaneously at the background and at the forefront of MEN1. Our attempts are thus more investigating new--as well as already open issues than delivering a catalog of MEN1 gene mutations