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The Tumor Microenvironment02:17

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Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
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Glycans, a class of complex heterogeneous molecules, can be covalently attached to proteins to form glycosylated proteins that regulate various physiological and pathological processes. Glycosylated proteins or glycoproteins comprise N-linked and O-linked oligosaccharides. O-glycosylation is the most common type of protein glycosylation. Here, glycans attach to the oxygen atom of the hydroxyl groups of Serine or Threonine residues. O-linked glycosylation occurs later in protein processing,...
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Shed proteoglycans in tumor stroma.

Zoi Piperigkou1,2, Benedikt Mohr1, Nikos Karamanos2

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Proteoglycans in the tumor microenvironment influence cancer progression. Shedding of these molecules alters cell behavior and interactions with the stroma, impacting diagnosis and therapy.

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Area of Science:

  • Oncology
  • Cell Biology
  • Biochemistry

Background:

  • Tumor progression is influenced by the tumor microenvironment, including cancer-associated fibroblasts, blood vessels, immune cells, and the extracellular matrix.
  • Proteoglycans play critical roles in cellular processes like proliferation, motility, cell-matrix interactions, immune cell recruitment, and angiogenesis.
  • Altered proteoglycan expression during cancer progression can activate signaling cascades that regulate cancer cell functions.

Purpose of the Study:

  • To review the significance of proteoglycans and their soluble forms in cancer progression.
  • To explore the consequences of proteoglycan interactions with the tumor stroma.
  • To highlight the implications for cancer diagnosis and therapeutic strategies.

Main Methods:

  • Review of existing literature on proteoglycans in cancer.
  • Analysis of the mechanisms of proteoglycan ectodomain shedding.
  • Examination of the interplay between shed proteoglycans, proteolytic enzymes, and the tumor microenvironment.

Main Results:

  • Proteoglycans are key mediators of cancer cell behavior through dynamic interactions with extracellular matrix components.
  • Ectodomain shedding converts cell surface proteoglycans into soluble molecules that act as paracrine effectors.
  • The interplay between shed proteoglycans and proteolytic enzymes significantly impacts both tumor cells and the surrounding stroma.

Conclusions:

  • Proteoglycans and their shed forms are crucial in cancer progression and stromal interactions.
  • Understanding these interactions offers potential for novel diagnostic and therapeutic approaches in cancer treatment.
  • Syndecan shedding, involving proteolytic cleavage and further processing, mediates signaling pathways crucial for cancer cell function.