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Related Concept Videos

Immunodeficiency Diseases01:25

Immunodeficiency Diseases

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Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
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Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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    Sirolimus and tacrolimus, common immunosuppressive drugs, impact endothelial cell function differently. Sirolimus impairs cell migration, proliferation, and angiogenesis, while tacrolimus affects nitric oxide release, offering insights into drug-induced vascular issues.

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    Area of Science:

    • Vascular Biology
    • Immunopharmacology
    • Stem Cell Biology

    Background:

    • Immunosuppressive medications are crucial for managing neoplasms, autoimmune diseases, and organ transplants.
    • These drugs are associated with adverse vascular remodeling, but cell-specific effects remain unclear.
    • Understanding drug-induced endothelial dysfunction is vital for patient outcomes.

    Purpose of the Study:

    • To investigate the differential effects of immunosuppressive drugs on endothelial cell function.
    • To utilize induced pluripotent stem-cell derived endothelial cells (iPSC-ECs) as a model system.
    • To elucidate mechanisms underlying drug-associated vascular complications.

    Main Methods:

    • Cultured iPSC-ECs to model endothelial cells.
    • Administered common immunosuppressive drugs, including sirolimus and tacrolimus.
    • Assessed endothelial cell functions: migration, proliferation, acetylated LDL uptake, angiogenesis, and nitric oxide release.

    Main Results:

    • Sirolimus significantly reduced endothelial cell migration, proliferation, acetylated LDL uptake, and angiogenesis.
    • Tacrolimus primarily inhibited nitric oxide release from endothelial cells.
    • iPSC-ECs demonstrated differential sensitivity to various immunosuppressive agents.

    Conclusions:

    • Immunosuppressive drugs exhibit distinct effects on endothelial cell function.
    • Sirolimus poses a greater risk to fundamental endothelial cell functions compared to tacrolimus.
    • This iPSC-EC model facilitates the study of drug-specific vascular toxicity.