PDK1 Orchestrates Early NK Cell Development Through Induction of E4BP4 Expression and Maintenance of IL-15 Responsiveness

Overview

Journal J Exp Med

Specialties Allergy & Immunology
General Medicine

Date 2015 Jan 28

PMID 25624444

Citations 55

Authors

Meixiang Yang

Dan Li

Zai Chang

Zhongzhou Yang

Zhigang Tian

Zhongjun Dong

Affiliations

Soon will be listed here.

Abstract

E4BP4, a circadian protein, is indispensable for NK cell development. It remains largely unknown which signal is required to induce E4BP4 expression and what effects it has during NK cell differentiation. Here, we reveal that PDK1, a kinase upstream of mTOR, connects IL-15 signaling to E4BP4. Early deletion of PDK1 caused a severe loss of NK cells and compromised antitumor activity in vivo. PDK1-deficient NK cells displayed much weaker IL-15-induced mTOR activation and E4BP4 induction, as well as remarkable reduction in CD122, a receptor subunit specifying NK cell responsiveness to IL-15. The phenotypes were partially reversible by ectopic expression of E4BP4 or bypassed activation of mTOR. We also determined that PDK1-mediated metabolic signaling was dispensable for NK cell terminal maturation and survival. Thus, we identify a role for PDK1 signaling as a key mediator in regulating E4BP4 expression during early NK cell development. Our findings underscore the importance of IL-15 self-responsiveness through a positive feedback loop that involves PDK1-mTOR-E4BP4-CD122 signaling.

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