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Cancer-induced systemic pre-conditioning of distant organs: building a niche for metastatic cells

Abstract

From their early genesis, tumour cells integrate with the surrounding normal cells to form an abnormal structure that is tightly integrated with the host organism via blood and lymphatic vessels and even neural associations. Using these connections, emerging cancers send a plethora of mediators that efficiently perturb the entire organism and induce changes in distant tissues. These perturbations serendipitously favour early metastatic establishment by promoting a more favourable tissue environment (niche) that supports the persistence of disseminated tumour cells within a foreign tissue. Because the establishment of early metastatic niches represents a key limiting step for metastasis, the creation of a more suitable pre-conditioned tissue strongly enhances metastatic success. In this Review, we provide an updated view of the mechanisms and mediators of primary tumours described so far that induce a pro-metastatic conditioning of distant organs, which favours early metastatic niche formation. We reflect on the nature of cancer-induced systemic conditioning, considering that non-cancer-dependent perturbations of tissue homeostasis are also able to trigger pro-metastatic conditioning. We argue that a more holistic view of the processes catalysing metastatic progression is needed to identify preventive or therapeutic opportunities.

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Fig. 1: Cancer-to-body connections.
Fig. 2: Cancer-derived pre-metastatic conditioning.
Fig. 3: Direct distant organ conditioning.
Fig. 4: Bone-marrow conditioning in the local and distal formation of pre-metastatic niches.
Fig. 5: Multi-organ and multi-system interactions between tumours and the host.

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Acknowledgements

The authors gratefully acknowledge funding support from a European Research Council grant (ERC CoG-H2020725492) and the Francis Crick Institute, which receives its core funding from Cancer Research UK (FC001112), the UK Medical Research Council (FC001112), and the Wellcome Trust (FC001112).

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Contributions

The authors contributed equally to researched data for the article. All authors contributed substantially to discussion of the content. N.R., R.M.M.F. and I.M. wrote the article, reviewed and edited the manuscript. S.D.B. wrote and reviewed parts of the manuscript before submission.

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Correspondence to Ilaria Malanchi.

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Nature Reviews Cancer thanks Ana Correia, Sachie Hiratsuka, who co-reviewed with Norihiro Ashihara, and Xiang Zhang, who co-reviewed with Fengshuo Liu, for their contribution to the peer review of this work.

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Glossary

Adipoblasts

Specialized cells of the adipose tissue derived from mesenchymal stem cells that function as precursors of adipocytes.

Bone resorption

Process by which osteoclasts dissolve the minerals in bone and break down the matrix.

Cachexia

Complex multiorgan syndrome causing wasting of the body.

Chronic unpredictable mild stress

(CUMS). Animal model of depression and stress characterized by exposure to a combination of mild and randomly administered sources of stress such as food and water deprivation, tilting of the cage, physical restraint and forced swimming. The purpose of this model is to mimic the stress in daily human life.

Citrullination

Process by which the amino acid arginine is converted into citrulline by post-translational modifications catalysed by peptidyl arginine deaminases, also referred to as deamination.

Decellularized matrices

Extracellular matrix from biological origins that have been processed to remove their cellular components to obtain a scaffold of the site-specific extracellular protein composition.

Degranulation

Action carried out by specialized cells that is characterized by the release of intracellular granules.

Granulopoiesis

Haematological process whereby granulocytes — namely neutrophils, eosinophils and basophils — are produced. This process is enhanced under certain inflammatory contexts and termed emergency granulopoiesis.

Hyperglycaemia

High levels of blood glucose in the absence of external glucose sources (such as food) during periods of fasting.

Lipolysis

Metabolic process to mobilize energy via the hydrolysis of triglycerides into glycerol and free fatty acids.

Long non-coding RNA

RNA sequences usually of about 200 nucleotides that are not translated into proteins.

Lymphangiogenesis

Physiological process for the formation and growth of new lymphatic vessels from pre-existing ones.

Matrisome

Chemical and biophysical composition of the extracellular matrix.

Microbiome

The microbiota naturally living in the human body at a given location or habitat. The term usually used in the context of the intestine is ‘gut microbiome’.

Microglia

Resident macrophages of the nervous system.

Myelopoiesis

Biological process for the formation of all myeloid cells (such as monocytes and granulocytes) from undifferentiated bone marrow progenitor cells.

Myofibroblasts

Specialized type of activated fibroblast, usually characterized by the expression of α-smooth-muscle actin and exhibiting a smooth-muscle (spindle) morphology.

Neurovascular unit

(NVU). Anatomical structure that provides integrity and regulates the blood–brain barrier. Composed of cerebral vascular cells and surrounding neurons, glia and extracellular matrix.

Neutrophil extracellular trap

(NET). An extracellular network of decondensed DNA and proteases from neutrophils, usually formed in the context of pathogens. The neutrophil specific process of NET release is known as NETosis.

Omentum

A multi-layered specialized tissue of the peritoneum.

Osteoblasts

Specialized cells originating from the monocyte lineage in the bone marrow whose function is to synthesize bone tissue.

Osteoclast

A specialized cell originating from the monocyte lineage in the bone marrow whose function is to break down bone tissue.

Osteoclastogenesis

The biological processes involved in bone degradation including osteoclast differentiation and bone resorption.

Pancreatic β-cells

Neuroendocrine pancreatic cells responsible for insulin production.

Purinergic signalling

Extracellular signalling mediated by purine nucleotides, such as ATP.

Thromboembolism

Vascular obstruction due to the formation of a blood clot.

Thrombosis

Formation of a blood clot.

White adipose tissue

(WAT). The most abundant type of adipose tissue involved in energy storage, endocrine communication and insulin sensitivity.

White adipose tissue browning

Metabolic adaptation to increased thermogenic demand characterized by the development of brown adipose tissue or the conversion of white adipocytes into beige adipocytes.

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Rabas, N., Ferreira, R.M.M., Di Blasio, S. et al. Cancer-induced systemic pre-conditioning of distant organs: building a niche for metastatic cells. Nat Rev Cancer 24, 829–849 (2024). https://doi.org/10.1038/s41568-024-00752-0

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