Phosphate Metabolic Inhibition Contributes to Irradiation-Induced Myelosuppression Through Dampening Hematopoietic Stem Cell Survival

Overview

Journal Nutrients

Date 2022 Aug 26

PMID 36014901

Authors

Yiding Wu

Weinian Liao

Jun Chen

Chaonan Liu

Shuzhen Zhang

Kuan Yu

Xinmiao Wang

Mo Chen

Song Wang

Xinze Ran

Yongping Su

Tianmin Cheng

Junping Wang

Changhong Du

Affiliations

Soon will be listed here.

Abstract

Myelosuppression is a common and intractable side effect of cancer therapies including radiotherapy and chemotherapy, while the underlying mechanism remains incompletely understood. Here, using a mouse model of radiotherapy-induced myelosuppression, we show that inorganic phosphate (Pi) metabolism is acutely inhibited in hematopoietic stem cells (HSCs) during irradiation-induced myelosuppression, and closely correlated with the severity and prognosis of myelosuppression. Mechanistically, the acute Pi metabolic inhibition in HSCs results from extrinsic Pi loss in the bone marrow niche and the intrinsic transcriptional suppression of soluble carrier family 20 member 1 (SLC20A1)-mediated Pi uptake by p53. Meanwhile, Pi metabolic inhibition blunts irradiation-induced Akt hyperactivation in HSCs, thereby weakening its ability to counteract p53-mediated Pi metabolic inhibition and the apoptosis of HSCs and consequently contributing to myelosuppression progression. Conversely, the modulation of the Pi metabolism in HSCs via a high Pi diet or renal Klotho deficiency protects against irradiation-induced myelosuppression. These findings reveal that Pi metabolism and HSC survival are causally linked by the Akt/p53-SLC20A1 axis during myelosuppression and provide valuable insights into the pathogenesis and management of myelosuppression.

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