نتایج جستجو برای: cd8 t لنفوسیت
تعداد نتایج: 708213 فیلتر نتایج به سال:
Although the adaptive immune system has a remarkable ability to mount rapid recall responses to previously encountered pathogens, the cellular and molecular signals necessary for memory CD8(+) T cell reactivation are poorly defined. IL-15 plays a critical role in memory CD8(+) T cell survival; however, whether IL-15 is also involved in memory CD8(+) T cell reactivation is presently unclear. Usi...
Chemokines and chemokine receptors play critical roles in directing the migration of alloreactive donor T cells into graft-vs-host disease (GVHD) target organs. However, blockade of GVHD by antagonist Ab against chemokine receptors remains an elusive goal. Using a mouse model of human GVHD, we demonstrate that in vivo administration of anti-CXCR3 Ab for 21 days (long-term), but not for 7 days (...
The mechanisms by which CD8+ T cells mediate immunity against bacterial pathogens remain largely unknown. Perforin-dependent cytolysis plays a role, but is not required for CD8+ T cell-mediated immunity against Listeria monocytogenes. TNF is essential for CD8+ T cell immunity to L. monocytogenes, but the cellular source of TNF is undefined. TNF-deficient and TNF/perforin double-deficient mice w...
In the thymus, the transcription factor ThPOK is essential for the development of the CD4 helper T cell lineage, whereas active repression of ThPOK is critical for the development of the CD8 cytotoxic T cell lineage. ThPOK gene silencing is thought to be irreversible in peripheral CD8 T cells. We noticed that ThPOK repression is readily abrogated upon in vitro TCR stimulation of peripheral CD8 ...
BACKGROUND & AIMS The requirement for costimulation of CD8 T-cell priming and restimulation by nonprofessional antigen-presenting cells is unresolved. Here, we investigated whether B7-H1 (CD274, PD-L1) on hepatocytes (HC) is involved in the specific activation of naive CD8 T cells or activated CD8 T blasts. METHODS Naive or activated CD8 T cells from transgenic OT-I mice were primed/restimula...
CD8 T cells expressing memory markers exist in naive mice and are thought to be of heterogeneous origin. It was recently reported that among such memory-phenotype (MP) CD8 T cells in naive mice, those expressing programmed death-1 (PD-1) had immune regulatory activity, but their origin and relationship with other regulatory CD8 T cell subsets remain unclear. In the current study, we examined de...
The CD154/CD40 interaction is an important pathway of CD4 T cell help for CD8 T cell responses. In this study, we address the role of CD70, a member of the TNF superfamily and the ligand for the T cell costimulatory receptor CD27, in CD40-mediated priming of CD8 T cells. Using an agonistic anti-CD40 mAb to mimic the CD154/CD40 interaction we demonstrate that the priming of OT-I TCR transgenic o...
In Chagas disease, CD8(+) T-cells are critical for the control of Trypanosoma cruzi during acute infection. Conversely, CD8(+) T-cell accumulation in the myocardium during chronic infection may cause tissue injury leading to chronic chagasic cardiomyopathy (CCC). Here we explored the role of CD8(+) T-cells in T. cruzi-elicited heart injury in C57BL/6 mice infected with the Colombian strain. Car...
تهاجم قارچها به بافتهای بدن انسان تقریبا از اوایل سال 1800 میلادی شناخته شده است و از سال 1900 به بعد گزارشات متعددی از بیماریهای قارچی و عوامل بیماریزای مربوطه، انتشار جغرافیایی و شیوع این بیماریها وجود دارد. وفور روز افزون بیماریهای قارچی در عصر حاضر و اهمیت تشخیصی آنها و نقش این موجودات در ایجاد بعضی از بیماریهای پوستی، مخاطی و سیستمیک موجب شد که در اغلب کشورهای پیشرفته جهان مطالعات و تحقیقا...
زمینه و هدف: از زمانی که محققین توانستند سلول های دندریتیک را از مونوسیت های خون محیطی متمایز کنند، دانشمندان بسیاری در پی یافتن بهترین راه تولید سلول های دندریتیک و بهینه سازی فرایند بلوغ این سلول ها، در شرایط آزمایشگاهی هستند تا از این سلول ها در درمان بیماری ها استفاده کنند. هدف از این مطالعه بلوغ سلول های دندریتیک مناسب ایمنی درمانی تومور می باشد. مواد و روش ها: در این مطالعه تجربی، تولید س...
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