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Lymphatic Vessels and Lymph Transport01:16

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Lymphatic vessels, known as lymphatics, are crucial in transporting lymph from peripheral tissues to our venous system. This process begins with lymph entering through tiny capillaries that branch through tissues. These capillaries have unique features such as larger diameters, thinner walls, and a distinctive one-way valve system formed by overlapping endothelial cells.
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Development of the Lymphatic System01:15

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The development of lymphatic tissues and vessels in embryonic life begins around the fifth week. These structures originate from the mesoderm layer, with lymph sacs emerging from developing veins.
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Introduction to Lymphatic and Immune System01:22

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Immunity is a crucial biological concept about our body's inherent capacity to prevent infections and diseases. A complex network of cells and tissues collectively known as the immune system facilitates this natural defense mechanism. The immune system plays an integral role in maintaining our health and well-being, shielding us from potential health threats.
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Functions of the Lymphatic and Immune System01:28

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The lymphatic system plays a crucial role in bolstering our immune system. It consists of a network of lymphoid organs, lymph, and lymphatic vessels that provide structural and functional support in safeguarding the body against pathogens such as viruses and bacteria.
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Density00:56

Density

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Density is an important characteristic of substances, crucial in determining whether an object sinks or floats in a fluid. Its SI unit is kg/m3, and its cgs unit is g/cm3. The density of an object helps in identifying its composition, and also reveals information about the phase of the matter and its substructure. The densities of liquids and solids are roughly comparable, consistent with the fact that their atoms are in close contact. However, gases have much lower densities than liquids and...
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The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...
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Blocking Lymph Flow by Suturing Afferent Lymphatic Vessels in Mice
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Lymphatic vessel density is associated with CD8

Natacha Bordry1,2, Maria A S Broggi2,3, Kaat de Jonge1

  • 1Clinical Tumor Biology and Immunotherapy Group, Department of Oncology and Ludwig Cancer Research, University of Lausanne (UNIL), Lausanne, Switzerland.

Oncoimmunology
|September 18, 2018
PubMed
Summary
This summary is machine-generated.

Tumor lymphatic vessel density correlates with increased CD8+ T cell infiltration and immunosuppression in melanoma patients. This suggests lymphatic vessels promote anti-tumor immunity while also enabling immune evasion, impacting immunotherapy outcomes.

Keywords:
ImmunotherapyT cell inhibitionT cell promotionlymphaticstumor immunology

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Area of Science:

  • Oncology
  • Immunology
  • Cancer Biology

Background:

  • Increased tumor-associated lymphatic vessel density (LVD) is linked to poor survival in various cancers, including melanoma.
  • Lymphatic drainage is crucial for initiating anti-tumor immune responses.
  • The dual role of lymphatic vessels in cancer immunity remains incompletely understood.

Purpose of the Study:

  • To investigate the correlation between lymphatic vessel density (LVD) and immune cell infiltration in primary cutaneous melanoma tumors and regional lymph nodes (LNs).
  • To explore the relationship between LVD and immunosuppressive molecules within the tumor microenvironment and draining LNs.

Main Methods:

  • Utilized immunohistochemistry to identify and quantify lymphatic vessels and immune cell markers.
  • Employed quantitative image analysis to assess LVD and immune cell infiltration in melanoma tissues and adjacent lymph nodes.
  • Analyzed the expression of immunosuppressive molecules, including inducible nitric oxide synthase (iNOS) and 2,3-dioxygenase (IDO).

Main Results:

  • Found significant positive correlations between LVD and CD8+ T cell infiltration in primary melanomas.
  • Observed a positive association between LVD and the expression of immunosuppressive molecules iNOS and IDO.
  • Identified similar correlations in tumor-free lymph nodes, suggesting local tumor effects on regional immune environments.

Conclusions:

  • Lymphatic vessels in melanoma play multifaceted roles, facilitating T cell infiltration while also promoting adaptive immunosuppressive mechanisms.
  • The presence of lymphatic vessels may enhance T cell infiltration, potentially improving immunotherapy efficacy if immune resistance is overcome.
  • Tumor-induced loco-regional changes in lymph nodes highlight the systemic impact of primary tumors on immune surveillance.