title: Tax posttranslational modifications and interaction with calreticulin in MT-2 cells and human peripheral blood mononuclear cells of human T cell lymphotropic virus type-I-associated myelopathy/tropical spastic paraparesis patients.
abstract: The human retrovirus human T cell lymphotropic virus type-I (HTLV-1) is the etiologic agent of HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). Axonal degeneration in HAM/TSP patients occurs without neuron infection, with the secreted viral Tax protein proposed to be involved. We previously found that Tax secreted into the culture medium of MT-2 cells (HTLV-1-infected cell line) produced neurite retraction in neuroblastoma cells differentiated to neuronal type. To assess the relevance of Tax posttranslational modifications on this effect, we addressed the question of whether Tax secreted by MT-2 cells and peripheral blood mononuclear cells (PBMCs) of HTLV-1-infected subjects is modified. The interaction of Tax with calreticulin (CRT) that modulates intracellular Tax localization and secretion has been described. We studied Tax localization and modifications in MT-2 cells and its interaction with CRT. Intracellular Tax in MT-2 cells was assessed by flow cytometry, corresponding mainly to a 71-kDa protein followed by western blot. This protein reported as a chimera with gp21 viral protein-confirmed by mass spectrometry-showed no ubiquitination or SUMOylation. The Tax-CRT interaction was determined by confocal microscopy and coimmunoprecipitation. Extracellular Tax from HAM/TSP PBMCs is ubiquitinated according to western blot, and its interaction with CRT was shown by coimmunoprecipitation. A positive correlation between Tax and CRT secretion was observed in HAM/TSP PBMCs and asymptomatic carriers. For both proteins inhibitors and activators of secretion showed secretion through the endoplasmic reticulum-Golgi complex. Tax, present in PBMC culture medium, produced neurite retraction in differentiated neuroblastoma cells. These results suggest that Tax, whether ubiquitinated or not, is active for neurite retraction.
authors: 1 Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile , Santiago, Chile .
authors: Fernando
authors: F
authors: Medina
authors: Sebastian
authors: S
authors: Quintremil
authors: Carolina
authors: C
authors: Alberti
authors: Andres
authors: A
authors: Barriga
authors: Luis
authors: L
authors: Cartier
authors: Javier
authors: J
authors: Puente
authors: Eugenio
authors: E
authors: Ramírez
authors: Arturo
authors: A
authors: Ferreira
authors: Yuetsu
authors: Y
authors: Tanaka
authors: Maria Antonieta
authors: MA
authors: Valenzuela
mesh_terms: D015153:Blotting, Western; D037282:Calreticulin / Q000378:metabolism*; D002478:Cells, Cultured; D005434:Flow Cytometry; D016356:Gene Products, tax / Q000378:metabolism*; D015490:HTLV-I Infections / Q000276:immunology / Q000821:virology; D054884:Host-Pathogen Interactions; D015368:Human T-lymphotropic virus 1 / Q000502:physiology*; D006801:Humans; D047468:Immunoprecipitation; D007963:Leukocytes, Mononuclear / Q000276:immunology* / Q000821:virology*; D018613:Microscopy, Confocal; D025941:Protein Interaction Mapping; D011499:Protein Processing, Post-Translational
chemical_list: C576483:CALR protein, human; D037282:Calreticulin; D016356:Gene Products, tax; C514970:tax protein, Human T-lymphotrophic virus 1