A role for mammalian target of rapamycin in regulating T cell activation versus anergy.

A role for mammalian target of rapamycin in regulating T cell activation versus anergy. Research Abstract Details 

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A role for mammalian target of rapamycin in regulating T cell activation versus anergy. Abstract Text:

Yan Zheng,Samuel L Collins,Michael A Lutz,Amy N Allen,Thomas P Kole,Paul E Zarek,Jonathan D Powell,

Whether TCR engagement leads to activation or tolerance is determined by the concomitant delivery of multiple accessory signals, cytokines, and environmental cues. In this study, we demonstrate that the mammalian target of rapamycin (mTOR) integrates these signals and determines the outcome of TCR engagement with regard to activation or anergy. In vitro, Ag recognition in the setting of mTOR activation leads to full immune responses, whereas recognition in the setting of mTOR inhibition results in anergy. Full T cell activation is associated with an increase in the phosphorylation of the downstream mTOR target S6 kinase 1 at Thr(421)/Ser(424) and an increase in the mTOR-dependent cell surface expression of transferrin receptor (CD71). Alternatively, the induction of anergy results in markedly less S6 kinase 1 Thr(421)/Ser(424) phosphorylation and CD71 surface expression. Likewise, the reversal of anergy is associated not with proliferation, but rather the specific activation of mTOR. Importantly, T cells engineered to express a rapamycin-resistant mTOR construct are resistant to anergy induction caused by rapamycin. In vivo, mTOR inhibition promotes T cell anergy under conditions that would normally induce priming. Furthermore, by examining CD71 surface expression, we are able to distinguish and differentially isolate anergic and activated T cells in vivo. Overall, our data suggest that by integrating environmental cues, mTOR plays a central role in determining the outcome of Ag recognition.

A role for mammalian target of rapamycin in regulating T cell activation versus anergy. Publishing Authors By Initials

Y Zheng,SL Collins,MA Lutz,AN Allen,TP Kole,PE Zarek,JD Powell,

For similar cells: blood cells: leukocytes: leukocytes, mononuclear: lymphocytes: t-lymphocytes research abstracts see: cells: blood cells: leukocytes: leukocytes, mononuclear: lymphocytes: t-lymphocytes research

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A role for mammalian target of rapamycin in regulating T cell activation versus anergy. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Journal of immunology (Baltimore, Md. : 1950)

VOLUME: 178

Page Numbers: 2163-70

Journal Abbreviation: J. Immunol.

ISSN: 0022-1767

DAY: 15

MONTH: Feb

YEAR: 2007

A role for mammalian target of rapamycin in regulating T cell activation versus anergy. Information

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LANGUAGE: eng

NlmUniqueID: 2985117

A role for mammalian target of rapamycin in regulating T cell activation versus anergy. Keywords Mesh Terms:

KEYWORDS: T-Lymphocytes

MESH TERMS: immunology

Chemical & Substance for Abstract: A role for mammalian target of rapamycin in regulating T cell activation versus anergy. Information

Substance Name: Ribosomal Protein S6 Kinases

Registry Number: EC 2.7.1.37

Grant and Affiliation Information for A role for mammalian target of rapamycin in regulating T cell activation versus anergy.

AFFILIATION: The Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University Medical Institutions, Baltimore, MD 21231, USA.

Country: United States

AGENCY: United States NCI

GRANT: R01CA98109

ACRONYM: CA

MEDLINETA: J Immunol

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