High frequency of viral protein expression in human T cell lymphotropic virus type 1-infected peripheral blood mononuclear cells. 2000

E Hanon, and R E Asquith, and G P Taylor, and Y Tanaka, and J N Weber, and C R Bangham
Department of Immunology, Imperial College School of Medicine, St Mary's campus, London W21PG, United Kingdom.

Most human T cell lymphotropic virus type (HTLV)-1-infected individuals mount a strong and persistently activated cytotoxic T lymphocyte (CTL) response to the virus, which implies that there is abundant chronic transcription of HTLV-1 genes. On the other hand, several observations suggest that HTLV-1 might be latent in vivo and therefore not detectable by CTLs. To clarify these discrepancies, we quantified the frequency of provirus-positive peripheral blood mononuclear cells (PBMCs) that were capable of expressing the HTLV-1 Tax protein, which is known to be the immunodominant target antigen recognized by HTLV-1-specific CTLs. The analysis showed that a significant proportion of HTLV-1-infected cells (from 14 to 100%) starts to express the Tax protein within a few hours of culture ex vivo. Phenotypic analysis confirmed that the main cell subpopulation expressing the Tax protein is CD4 positive. Frequent Tax expression in CD4(+) T lymphocytes in vivo might account for the chronic activation of the cytotoxic immune response observed in the majority of HTLV-1-infected patients and might contribute to the pathogenesis of HTLV-1-associated diseases.

UI MeSH Term Description Entries
D007963 Leukocytes, Mononuclear Mature LYMPHOCYTES and MONOCYTES transported by the blood to the body's extravascular space. They are morphologically distinguishable from mature granulocytic leukocytes by their large, non-lobed nuclei and lack of coarse, heavily stained cytoplasmic granules. Mononuclear Leukocyte,Mononuclear Leukocytes,PBMC Peripheral Blood Mononuclear Cells,Peripheral Blood Human Mononuclear Cells,Peripheral Blood Mononuclear Cell,Peripheral Blood Mononuclear Cells,Leukocyte, Mononuclear
D010641 Phenotype The outward appearance of the individual. It is the product of interactions between genes, and between the GENOTYPE and the environment. Phenotypes
D011533 Proviruses Duplex DNA sequences in eukaryotic chromosomes, corresponding to the genome of a virus, that are transmitted from one cell generation to the next without causing lysis of the host. Proviruses are often associated with neoplastic cell transformation and are key features of retrovirus biology. Provirus
D002353 Carrier State The condition of harboring an infective organism without manifesting symptoms of infection. The organism must be readily transmissible to another susceptible host. Asymptomatic Carrier State,Asymptomatic Infection Carrier,Inapparent Infection Carrier,Presymptomatic Carrier State,Presymptomatic Infection Carrier,Super-spreader Carrier,Superspreader Carrier,Asymptomatic Carrier States,Asymptomatic Infection Carriers,Carrier State, Asymptomatic,Carrier State, Presymptomatic,Carrier States,Carrier, Super-spreader,Carrier, Superspreader,Carriers, Super-spreader,Carriers, Superspreader,Inapparent Infection Carriers,Infection Carrier, Asymptomatic,Infection Carrier, Inapparent,Infection Carrier, Presymptomatic,Presymptomatic Carrier States,Presymptomatic Infection Carriers,Super spreader Carrier,Super-spreader Carriers,Superspreader Carriers
D002478 Cells, Cultured Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others. Cultured Cells,Cell, Cultured,Cultured Cell
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D015368 Human T-lymphotropic virus 1 A strain of PRIMATE T-LYMPHOTROPIC VIRUS 1 isolated from mature T4 cells in patients with T-lymphoproliferation malignancies. It causes adult T-cell leukemia (LEUKEMIA-LYMPHOMA, T-CELL, ACUTE, HTLV-I-ASSOCIATED), T-cell lymphoma (LYMPHOMA, T-CELL), and is involved in mycosis fungoides, SEZARY SYNDROME and tropical spastic paraparesis (PARAPARESIS, TROPICAL SPASTIC). ATLV,Adult T-Cell Leukemia-Lymphoma Virus I,HTLV-1,HTLV-I,Human T-Cell Leukemia Virus I,Leukemia Virus I, Human T-Cell,T-Cell Leukemia Virus I, Human,Adult T Cell Leukemia Lymphoma Virus I,Human T Cell Leukemia Virus I,Leukemia Lymphoma Virus I, Adult T Cell,Leukemia Virus I, Human T Cell,T Cell Leukemia Virus I, Human,Human T lymphotropic virus 1
D015493 Paraparesis, Tropical Spastic A subacute paralytic myeloneuropathy occurring endemically in tropical areas such as the Caribbean, Colombia, India, and Africa, as well as in the southwestern region of Japan; associated with infection by HUMAN T-CELL LEUKEMIA VIRUS I. Clinical manifestations include a slowly progressive spastic weakness of the legs, increased reflexes, Babinski signs, incontinence, and loss of vibratory and position sensation. On pathologic examination inflammatory, demyelination, and necrotic lesions may be found in the spinal cord. (Adams et al., Principles of Neurology, 6th ed, p1239) HTLV-I-Associated Myelopathy,Tropical Spastic Paraparesis,Familial Spastic Paraparesis, Htlv-1-Associated,HTLV I Associated Myelopathies,HTLV-I-Associated Myelopathy-Tropical Spastic Paraparesis,Human T-Lymphotropic Virus Type 1 Associated Myelopathy,Myelopathies, HTLV I Associated,Myelopathy, Htlv-1-Associated,Myelopathy, Human T-Lymphotropic Virus Type 1 Associated,Paraplegia, Tropical Spastic,Familial Spastic Paraparesis, Htlv 1 Associated,HTLV I Associated Myelopathy,HTLV I Associated Myelopathy Tropical Spastic Paraparesis,HTLV-I-Associated Myelopathies,Htlv-1-Associated Myelopathies,Htlv-1-Associated Myelopathy,Human T Lymphotropic Virus Type 1 Associated Myelopathy,Myelopathies, HTLV-I-Associated,Myelopathies, Htlv-1-Associated,Myelopathy, HTLV-I-Associated,Myelopathy, Htlv 1 Associated,Myelopathy, Human T Lymphotropic Virus Type 1 Associated,Parapareses, Tropical Spastic,Paraplegias, Tropical Spastic,Spastic Parapareses, Tropical,Spastic Paraparesis, Tropical,Spastic Paraplegia, Tropical,Spastic Paraplegias, Tropical,Tropical Spastic Parapareses,Tropical Spastic Paraplegia,Tropical Spastic Paraplegias
D015496 CD4-Positive T-Lymphocytes A critical subpopulation of T-lymphocytes involved in the induction of most immunological functions. The HIV virus has selective tropism for the T4 cell which expresses the CD4 phenotypic marker, a receptor for HIV. In fact, the key element in the profound immunosuppression seen in HIV infection is the depletion of this subset of T-lymphocytes. T4 Cells,T4 Lymphocytes,CD4-Positive Lymphocytes,CD4 Positive T Lymphocytes,CD4-Positive Lymphocyte,CD4-Positive T-Lymphocyte,Lymphocyte, CD4-Positive,Lymphocytes, CD4-Positive,T-Lymphocyte, CD4-Positive,T-Lymphocytes, CD4-Positive,T4 Cell,T4 Lymphocyte
D016356 Gene Products, tax Transcriptional trans-acting proteins of the promoter elements found in the long terminal repeats (LTR) of HUMAN T-LYMPHOTROPIC VIRUS 1 and HUMAN T-LYMPHOTROPIC VIRUS 2. The tax (trans-activator x; x is undefined) proteins act by binding to enhancer elements in the LTR. Trans-Activator Protein p40(tax),Trans-Activator Protein p40(x),p40(tax),tax Gene Products,tax Protein,Gene Product, tax,Trans-Activator Protein p40(lor),Trans-Activator Protein p40x,Trans-Activator Protein pX,Transactivator Protein p40(x),Transactivator p40(tax),Transforming Antigen p40x,p40 tax,Antigen p40x, Transforming,Trans Activator Protein p40x,Trans Activator Protein pX,p40x, Trans-Activator Protein,p40x, Transforming Antigen,pX, Trans-Activator Protein,tax Gene Product

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