Trends in Cell Biology
Volume 32, Issue 2, February 2022, Pages 110-123
Journal home page for Trends in Cell Biology

Review
A glitch in the matrix: organ-specific matrisomes in metastatic niches

https://doi.org/10.1016/j.tcb.2021.08.001Get rights and content

Highlights

  • The extracellular matrix (ECM) of different organs are composed of distinct combinations of matrisomal proteins; metastasis-supportive modifications of these ECMs can be similarly specific to each organ niche while sharing commonalities.

  • Tumor-derived extracellular vesicles (EVs) home to lung fibroblasts, activate them to cancer-associated fibroblasts (CAFs), and induce a metastasis-supportive microenvironment through collagen and fibronectin deposition and ECM modification.

  • Immune cells play a significant role in profibrotic changes in the liver and lung metastatic niches.

  • The bone and brain have unique ECM compositions that produce singular types of modifications.

  • Increased understanding of metastasis-supportive ECM changes has enabled development of more accurate models and revealed important clinical considerations.

  • Novel therapeutic approaches for targeting of ECM changes in the premetastatic niche may be beneficial in preventing metastatic relapse.

Modification of the extracellular matrix (ECM) is a critical aspect of developing a metastasis-supportive organ niche. Recent work investigating ECM changes that facilitate metastasis has revealed ways in which different metastatic organ niches are similar as well as the distinct characteristics that make them unique. In this review, we present recent findings regarding how ECM modifications support metastasis in four frequent metastatic sites: the lung, liver, bone, and brain. We discuss ways in which these modifications are shared between metastatic organs as well as features specific to each location. We also discuss areas of technical innovation that could be advantageous to future research and areas of inquiry that merit further investigation.

Section snippets

The extracellular matrix plays an integral role in establishing metastatic niches

Metastasis is responsible for ~90% of cancer-related deaths. Extensive research has focused on what causes cancer cells to spread and how these mechanisms can be targeted or prevented. Since the introduction of Paget’s now renowned ‘seed and soil hypothesis’ in 1889 [1], it has been recognized that the environment of the secondary site plays a crucial role in determining the success of metastatic colonization. More recently, the discovery that the primary tumor can influence the formation of a

Normal ECM composition in common metastatic organs

The tasks of the ECM in all organs are largely consistent: provide structural support for tissues through the ECM architecture and act as a modulator of cell function and phenotype. The latter is achieved by (i) regulating biochemical signals through the sequestration and release of signaling molecules and acting as ligands that drive cellular signaling and (ii) regulating mechanical signals by altering the stiffness of the microenvironment. Thus, remodeling of the ECM is a normal physiological

Lung

The lung is a common site of metastasis for various human cancers, including breast, melanoma, colorectal, bladder, and kidney cancer. Many mouse models of metastasis have a propensity for lung tropism, making it a frequent site of study for PMN characterization. Lung-resident fibroblasts have been identified by numerous studies as key players in metastatic niche formation [9., 10., 11., 12., 13., 14., 15., 16., 17.]. Reprogramming resident fibroblasts and other recruited mesenchymal cells to

ECM changes exhibit organ specificity

As illustrated earlier, ECM changes supporting distinct metastatic niches in different organs share numerous characteristics, including the functions of activated cells, upregulated molecules, and resulting effects. Studies that directly compare metastatic niches of the same tumor type in different organs showed that some ECM-related mechanisms of niche formation are robust across metastatic sites [11]. However, these types of studies also uncovered organ-specific mechanistic nuances. For

Matrisome research perspective

Investigating the metastatic ECM is tricky due to its dynamic nature of subtle and cumulative changes involving a complex array of players. One approach to overcome this has been to integrate multiple analyses to maximize the information that can be gleaned from samples, particularly limited patient tissues. In an MS-based proteomic analysis, the matrisomes of normal colon, CRC, and liver metastases from three patients were compared to identify tissue-specific changes that could act as novel

Concluding remarks

Recent work investigating the ECM has revealed its important role in contributing to the formation of metastasis-supportive environments. The variety of lung metastasizing models provided an abundance of data illuminating the complexity of interactions and modifications that contribute to the PMN. From this point, both robust mechanisms shared between common metastatic organs and unique changes identified through comparative analysis revealed new avenues for research and presented opportunities

Acknowledgments

N.E. is supported by grants from the Israel Science Foundation (ISF), the Israel Cancer Research Fund (ICRF), Worldwide Cancer Research, and the Melanoma Research Alliance (MRA). Figures were created with BioRender.com.

Declaration of interests

The authors declare no competing interests.

Glossary

Basement membrane (BM)
sheets of specialized ECM deposited between epithelial tissue and the supporting connective tissue. The BM is typically composed of laminins, type IV collagens, and fibronectin. It functions to provide support, aid tissue compartmentalization, and regulate cell behavior.
Bleomycin
a chemotherapeutic that when instilled into the lungs of mice induces a fibrotic response.
Bone marrow-derived cells (BMDCs)
a heterogeneous population of pluripotent stem and progenitor cells, such

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