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Activation of glutamate-cysteine ligase in lymphocytes

Show simple item record Krejsa, Cecile M., 1964- en_US 2009-10-06T21:46:01Z 2009-10-06T21:46:01Z 2000 en_US
dc.identifier.other b45464352 en_US
dc.identifier.other 46987911 en_US
dc.identifier.other Thesis 49926 en_US
dc.description Thesis (Ph. D.)--University of Washington, 2000 en_US
dc.description.abstract Lymphocytes are normally quiescent cells that react to receptor-based signals by developing into functional effector cells that orchestrate immune responses. In their resting state, lymphocytes are highly susceptible to oxidative stress, which can alter signal transduction, inhibiting antigen-specific responses. Glutathione (GSH), the major cellular thiol antioxidant, is required for robust lymphocyte responses. Glutamate-cysteine ligase (GLCL; E.C. catalyzes the rate-limiting step in the biosynthesis of GSH. The studies presented herein characterize the induction of GLCL protein in lymphocytes following stimulation of proliferative responses by the mitogen phytohemagglutinin, and by cell surface receptors. Upregulation of GLCL protein is shown to be linked tightly with cell proliferation. In addition, the present work describes changes in GLCL activity following treatments that induce oxidative stress and deplete GSH in lymphocytes, and proposes a novel mechanism for the rapid activation of GLCL. Finally, this report provides evidence that the catalytic subunit of GLCL is cleaved in lymphocytes and other cells in a caspase-3 dependent fashion during programmed cell death. The site of cleavage is identified and results from initial investigations of the function of cleaved GLCL are presented. The studies described herein demonstrate that lymphocytes possess multiple mechanisms for the activation of GLCL and control of GSH biosynthesis. en_US
dc.format.extent vi, 169 p. en_US
dc.language.iso en_US en_US
dc.rights Copyright is held by the individual authors. en_US
dc.rights.uri en_US
dc.subject.other Theses--Environmental health en_US
dc.title Activation of glutamate-cysteine ligase in lymphocytes en_US
dc.type Thesis en_US

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