Susan K. Loftin

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During activation, T cells express receptors for receiving positive and negative costimulatory signals. Here we identify the B and T lymphocyte attenuator (BTLA), an immunoglobulin domain-containing glycoprotein with two immunoreceptor tyrosine-based inhibitory motifs. BTLA is not expressed by naive T cells, but it is induced during activation and remains(More)
Epstein-Barr virus (EBV) causes potentially lethal immunoblastic lymphoma in up to 25% of children receiving bone marrow transplants from unrelated or HLA-mismatched donors. Because this complication appears to stem from a deficiency of EBV-specific cytotoxic T cells, we assessed the safety and efficacy of donor-derived polyclonal (CD4(+) and CD8(+)) T-cell(More)
Reactivation of Epstein-Barr virus (EBV) after bone-marrow transplantation leads in many cases to lymphoproliferative disease that responds poorly to standard therapy and is usually fatal. To prevent or control this complication, we prepared EBV-specific cytotoxic T-lymphocyte (CTL) lines from donor leucocytes and infused them into ten allograft recipients.(More)
Adoptive transfer of antigen-specific cytotoxic T lymphocytes (CTLs) offers safe and effective therapy for certain viral infections and could prove useful in the eradication of tumor cells. Whether or not the infused T cells persist for extended periods, retaining their ability to expand in response to antigenic stimulation, is not known. We now report(More)
Epstein-Barr virus-associated lymphoproliferative disease (EBV-LPD) is a common, usually fatal, complication developing after transplantation of bone marrow from HLA-mismatched or HLA-matched unrelated donors. Prompted by recent reports of successful treatment of EBV-LPD, we investigated methods which could result in early identification of patients at high(More)
Apathy, primarily defined as a lack of motivation, commonly occurs in people with Parkinson disease (PD). Although dysfunction of basal ganglia pathways may contribute to apathy, the role of dopamine remains largely unknown. We investigated the role of dopaminergic pathways in the manifestation of apathetic behaviors by measuring the effects of the(More)
B and T lymphocytes express receptors providing positive and negative co-stimulatory signals. We recently identified a novel co-stimulatory molecule, B and T lymphocyte attenuator (BTLA), which exerts inhibitory effects on B and T lymphocytes. The cytoplasmic domain of murine and human BTLA share three conserved tyrosine-based signaling motifs, a Grb-2(More)
EBV-induced lymphoproliferative disease (EBV-LPD) is a disorder most commonly associated with the immunocompromise that follows allogeneic organ transplantation. In patients receiving T cell-depleted bone marrow from HLA-mismatched or HLA-matched unrelated donors, the incidence of EBV-LPD is particularly high, ranging from 5 to 30%. Administration of(More)
Plasma measurements of levodopa and its major metabolites including dopamine and 3-O-methyldopa have been limited by cumbersome methods and poor sensitivity within relatively narrow ranges of plasma levels. We now report a modification of an HPLC method that permits concomitant measurements of a wide range of concentrations of levodopa, dopamine (DA),(More)
OBJECTIVE Nigrostriatal reserve refers to the threshold of neuronal injury to dopaminergic cell bodies and their terminal fields required to produce parkinsonian motor deficits. Inferential studies have estimated striatal dopamine reserve to be at least 70%. Knowledge of this threshold is critical for planning interventions to prevent symptom onset or(More)