Activated human T-lymphotropic virus type-1 (HTLV-1)-specific CD8-positive cytotoxic T lymphocytes (CTLs) are markedly increased in the periphery of patients with HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP), an HTLV-1-induced inflammatory disease of the CNS. Although virus-specific CTLs play a pivotal role to eliminate virus-infected cells, the potential role of HTLV-1-s...

To study antitumor functions of T-lymphocyte subpopulations in the blood [peripheral blood lymphocytes (PBLs)] and tumor-draining lymph nodes (LNs) of patients (n = 26) with squamous cell carcinoma of the head and neck (SCCHN), antibody-coated devices were used to positively select CD8+ or CD4+ cells. The mean percentage of CD8+ cells captured on antibody-coated flasks from PBLs was 92% and tha...

Surfactant protein D (SP-D) appears to play an important role in regulating local pulmonary inflammatory responses to pathogens. There is also in vitro evidence that SP-D may suppress local T cell responses. However, the role of SP-D in regulating T cell responses directly in the lung has not been previously evaluated in vivo. SP-D(-)(/-) mice demonstrate peribronchial and perivascular accumula...

Background: Lymphocyte subsets enumeration is considered prominent in the management of primary and acquired immunodeficiency disorders. Because of local variations due to race, age, gender, and environmental conditions on lymphocyte subsets, and to improve the accuracy of interpretation of laboratory findings, reference intervals must be determined in every population. Objective: To establish ...

SOCS1(-/-) mice accumulate within the thymus and periphery CD8(+) lymphocytes that express memory cell markers and display heightened in vitro responses to common gamma-chain cytokines. To investigate whether dysregulated homeostasis of T lymphocytes and acquisition of memory phenotype by CD8(+) cells in SOCS1(-/-) mice were mediated by IL-7 and/or IL-15 in vivo, we have generated SOCS1(-/-)IL-...

UNLABELLED Numerous studies have demonstrated that CD8(+) T lymphocytes suppress virus replication during human immunodeficiency virus (HIV)/simian immunodeficiency virus (SIV) infection. However, the mechanisms underlying this activity of T cells remain incompletely understood. Here, we conducted CD8(+) T lymphocyte depletion in 15 rhesus macaques (RMs) infected intravenously (i.v.) with SIVma...

Monoclonal antibodies directed against CD3, a T cell-specific surface molecule essentially required for activation of these cells, are highly mitogenic for resting human peripheral blood T lymphocytes. A predetermined optimal concentration of anti-CD3 monoclonal antibody WT32 was employed to activate T cells cultured in limiting-dilution microcultures containing irradiated feeder cells and exog...

Cellular senescence contributes to aging and decline in tissue function. p53 isoform switching regulates replicative senescence in cultured fibroblasts and is associated with tumor progression. Here, we found that the endogenous p53 isoforms Δ133p53 and p53β are physiological regulators of proliferation and senescence in human T lymphocytes in vivo. Peripheral blood CD8+ T lymphocytes collected...