O'Brien, Katie L. and Assmann, Nadine and O'Connor, Eimear and Keane, Cathal and Walls, Jessica and Choi, Chloe and Oefner, Peter J. and Gardiner, Clair M. and Dettmer, Katja and Finlay, David K. (2021) De novo polyamine synthesis supports metabolic and functional responses in activated murine NK cells. EUROPEAN JOURNAL OF IMMUNOLOGY, 51 (1). pp. 91-102. ISSN 0014-2980, 1521-4141
Full text not available from this repository. (Request a copy)Abstract
Cellular metabolism is dynamically regulated in NK cells and strongly influences their responses. Metabolic dysfunction is linked to defective NK cell responses in diseases such as obesity and cancer. The transcription factors, sterol regulatory element binding protein (SREBP) and cMyc, are crucial for controlling NK cell metabolic and functional responses, though the mechanisms involved are not fully understood. This study reveals a new role for SREBP in NK cells in supporting de novo polyamine synthesis through facilitating elevated cMyc expression. Polyamines have diverse roles and their de novo synthesis is required for NK cell glycolytic and oxidative metabolism and to support optimal NK cell effector functions. When NK cells with impaired SREBP activity were supplemented with exogenous polyamines, NK cell metabolic defects were not rescued but these NK cells displayed significant improvement in some effector functions. One role for polyamines is in the control of protein translation where spermidine supports the posttranslational hypusination of translation factor eIF5a. Pharmacological inhibition of hypusination also impacts upon NK cell metabolism and effector function. Considering recent evidence that cholesterol-rich tumor microenvironments inhibit SREBP activation and drive lymphocyte dysfunction, this study provides key mechanistic insight into this tumor-evasion strategy.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DEPRIVATION; INHIBITOR; cMyc; natural killer cell; metabolism; polyamines; SREBP |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Institut für Funktionelle Genomik > Lehrstuhl für Funktionelle Genomik (Prof. Oefner) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 17 May 2021 16:11 |
| Last Modified: | 17 May 2021 16:11 |
| URI: | https://pred.uni-regensburg.de/id/eprint/43395 |
Actions (login required)
 |
View Item |
