{"id":{"repo_id":"tenn-hsc","oai_identifier":"oai:dc.uthsc.edu:dissertations-1382"},"canonical_url":"https://search.dev.ndltd.org/etd/tenn-hsc/oai:dc.uthsc.edu:dissertations-1382","repository":{"repo_id":"tenn-hsc","name":"University of Tennessee Health Science Center","base_url":"https://dc.uthsc.edu/do/oai/"},"display":{"title":"Pten Signaling in Regulatory T Cells and Inflammatory Disease","abstract":"Regulatory T (Treg) cells suppress CD4+ T cell responses during homeostasis and inflammation to prevent autoimmunity and other immune disorders. Although the transcriptional and epigenetic programs impacting Treg cell function have been extensively studied, the signaling and metabolic pathways underlying Treg stability and function are not fully understood. In this study, we determined the role of the phosphatase PTEN in Treg cells. We found that specific depletion of PTEN in Treg cells results in excessive TH1 and T follicular helper cells (TFH) responses, associated with elevated germinal center (GC) B cells and spontaneous development of autoimmune and lymphoproliferative disease in vivo. Interestingly, the exaggerated TFH and GC responses and autoimmune symptoms are suppressed when IFN-γ expression is abrogated in mice containing Pten-deficient Treg cells. Thus, the uncontrolled TH1-mediated inflammation in these mice drives aberrant TFH responses and autoimmune and lymphoproliferative disease. Mechanistically, we linked PTEN to mTORC2-mediated control of transcriptional and metabolic programs that enforce Treg cell stability and function. Consistent with this notion, deletion of Rictor, the obligate component for mTORC2, restores Treg cell function and stability in the absence of Pten. Similarly, partially restoring the activity of Foxo1, a downstream transcription factor negatively regulated by mTORC2 signaling, also largely rectified the defects of PTEN-deficient Treg cells. Together, these results establish that Treg cells rely on the PTEN-mTORC2-Foxo1 axis to maintain their stability and suppressive activity in controlling TH1 and TFH cell responses.","abstract_html":"Regulatory T (Treg) cells suppress CD4+ T cell responses during homeostasis and inflammation to prevent autoimmunity and other immune disorders. Although the transcriptional and epigenetic programs impacting Treg cell function have been extensively studied, the signaling and metabolic pathways underlying Treg stability and function are not fully understood. In this study, we determined the role of the phosphatase PTEN in Treg cells. We found that specific depletion of PTEN in Treg cells results in excessive TH1 and T follicular helper cells (TFH) responses, associated with elevated germinal center (GC) B cells and spontaneous development of autoimmune and lymphoproliferative disease in vivo. Interestingly, the exaggerated TFH and GC responses and autoimmune symptoms are suppressed when IFN-γ expression is abrogated in mice containing Pten-deficient Treg cells. Thus, the uncontrolled TH1-mediated inflammation in these mice drives aberrant TFH responses and autoimmune and lymphoproliferative disease. Mechanistically, we linked PTEN to mTORC2-mediated control of transcriptional and metabolic programs that enforce Treg cell stability and function. Consistent with this notion, deletion of Rictor, the obligate component for mTORC2, restores Treg cell function and stability in the absence of Pten. Similarly, partially restoring the activity of Foxo1, a downstream transcription factor negatively regulated by mTORC2 signaling, also largely rectified the defects of PTEN-deficient Treg cells. Together, these results establish that Treg cells rely on the PTEN-mTORC2-Foxo1 axis to maintain their stability and suppressive activity in controlling TH1 and TFH cell responses.","abstract_has_math":false,"creators":["Shrestha, Sharad Krishna"],"institution":null,"degree_name":"Doctor of Philosophy (PhD)","degree_level":"Dissertation","degree_discipline":"Biomedical Sciences","degree_department":null,"school":null,"contributors":["Hongbo Chi, Ph.D."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2016,"date_issued":"2016-05-01T07:00:00Z","date_published":"2016-05-01T07:00:00Z","updated_at":"2026-07-24T05:00:23Z","subjects":["Regulatory T cells","Follicular T helper cells","PTEN","T cell memory","Glycolysis","Immune response","Biological Phenomena, Cell Phenomena, and Immunity","Diseases","Immune System Diseases","Medical Biochemistry","Medical Cell Biology","Medical Immunology","Medical Sciences","Medicine and Health Sciences"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://dc.uthsc.edu/dissertations/393","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Hongbo Chi, Ph.D."]},{"key":"dc:creator","label":"Author","values":["Shrestha, Sharad Krishna"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.available","label":"Dc Date Available","values":["2018-06-23T07:00:00Z"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Biomedical Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Doctor of Philosophy (PhD)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Regulatory T cells","Follicular T helper cells","PTEN","T cell memory","Glycolysis","Immune response","Biological Phenomena, Cell Phenomena, and Immunity","Diseases","Immune System Diseases","Medical Biochemistry","Medical Cell Biology","Medical Immunology","Medical Sciences","Medicine and Health Sciences"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://dc.uthsc.edu/dissertations/393"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Regulatory T (Treg) cells suppress CD4+ T cell responses during homeostasis and inflammation to prevent autoimmunity and other immune disorders. Although the transcriptional and epigenetic programs impacting Treg cell function have been extensively studied, the signaling and metabolic pathways underlying Treg stability and function are not fully understood. In this study, we determined the role of the phosphatase PTEN in Treg cells. We found that specific depletion of PTEN in Treg cells results in excessive TH1 and T follicular helper cells (TFH) responses, associated with elevated germinal center (GC) B cells and spontaneous development of autoimmune and lymphoproliferative disease in vivo. Interestingly, the exaggerated TFH and GC responses and autoimmune symptoms are suppressed when IFN-γ expression is abrogated in mice containing Pten-deficient Treg cells. Thus, the uncontrolled TH1-mediated inflammation in these mice drives aberrant TFH responses and autoimmune and lymphoproliferative disease. Mechanistically, we linked PTEN to mTORC2-mediated control of transcriptional and metabolic programs that enforce Treg cell stability and function. Consistent with this notion, deletion of Rictor, the obligate component for mTORC2, restores Treg cell function and stability in the absence of Pten. Similarly, partially restoring the activity of Foxo1, a downstream transcription factor negatively regulated by mTORC2 signaling, also largely rectified the defects of PTEN-deficient Treg cells. Together, these results establish that Treg cells rely on the PTEN-mTORC2-Foxo1 axis to maintain their stability and suppressive activity in controlling TH1 and TFH cell responses."]},{"key":"dc:title","label":"Title","values":["Pten Signaling in Regulatory T Cells and Inflammatory Disease"]}]}],"canonical_facts":{"dc:contributor":["Hongbo Chi, Ph.D."],"dc:creator":["Shrestha, Sharad Krishna"],"dc:date.available":["2018-06-23T07:00:00Z"],"dc:description.abstract":["Regulatory T (Treg) cells suppress CD4+ T cell responses during homeostasis and inflammation to prevent autoimmunity and other immune disorders. Although the transcriptional and epigenetic programs impacting Treg cell function have been extensively studied, the signaling and metabolic pathways underlying Treg stability and function are not fully understood. In this study, we determined the role of the phosphatase PTEN in Treg cells. We found that specific depletion of PTEN in Treg cells results in excessive TH1 and T follicular helper cells (TFH) responses, associated with elevated germinal center (GC) B cells and spontaneous development of autoimmune and lymphoproliferative disease in vivo. Interestingly, the exaggerated TFH and GC responses and autoimmune symptoms are suppressed when IFN-γ expression is abrogated in mice containing Pten-deficient Treg cells. Thus, the uncontrolled TH1-mediated inflammation in these mice drives aberrant TFH responses and autoimmune and lymphoproliferative disease. Mechanistically, we linked PTEN to mTORC2-mediated control of transcriptional and metabolic programs that enforce Treg cell stability and function. Consistent with this notion, deletion of Rictor, the obligate component for mTORC2, restores Treg cell function and stability in the absence of Pten. Similarly, partially restoring the activity of Foxo1, a downstream transcription factor negatively regulated by mTORC2 signaling, also largely rectified the defects of PTEN-deficient Treg cells. Together, these results establish that Treg cells rely on the PTEN-mTORC2-Foxo1 axis to maintain their stability and suppressive activity in controlling TH1 and TFH cell responses."],"dc:identifier":["https://dc.uthsc.edu/dissertations/393"],"dc:subject":["Regulatory T cells","Follicular T helper cells","PTEN","T cell memory","Glycolysis","Immune response","Biological Phenomena, Cell Phenomena, and Immunity","Diseases","Immune System Diseases","Medical Biochemistry","Medical Cell Biology","Medical Immunology","Medical Sciences","Medicine and Health Sciences"],"dc:title":["Pten Signaling in Regulatory T Cells and Inflammatory Disease"],"thesis:degree_discipline":["Biomedical Sciences"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Doctor of Philosophy (PhD)"]},"updated_at":"2026-07-24T05:00:23Z"}