Emergency myelopoiesis in solid cancers

Br J Haematol. 2024 Sep;205(3):798-811. doi: 10.1111/bjh.19656. Epub 2024 Jul 23.

Abstract

Cells of the innate and adaptive immune systems are the progeny of haematopoietic stem and progenitor cells (HSPCs). During steady-state myelopoiesis, HSPC undergo differentiation and proliferation but are called to respond directly and acutely to various signals that lead to emergency myelopoiesis, including bone marrow ablation, infections, and sterile inflammation. There is extensive evidence that many solid tumours have the potential to secrete classical myelopoiesis-promoting growth factors and other products able to mimic emergency haematopoiesis, and to aberrantly re-direct myeloid cell development into immunosuppressive cells with tumour promoting properties. Here, we summarize the current literature regarding the effects of solid cancers on HSPCs function and discuss how these effects might shape antitumour responses via a mechanism initiated at a site distal from the tumour microenvironment.

Keywords: cancer; clonal hematopoiesis; emergency myelopoiesis; myeloid derived suppressor cells; myelopoiesis; tumour associated macrophages.

Publication types

  • Review

MeSH terms

  • Animals
  • Hematopoietic Stem Cells / pathology
  • Humans
  • Myelopoiesis*
  • Neoplasms* / immunology
  • Neoplasms* / pathology
  • Tumor Microenvironment / immunology