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Bone Marrow-Derived IL-1Ra Increases TNF Levels Poststroke.

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Bone marrow cells modulate brain inflammation after stroke by altering levels of key mediators like tumor necrosis factor (TNF) and interleukin-1 receptor antagonist (IL-1Ra), promoting an anti-inflammatory environment and improving outcomes.

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braincell therapychemokinescytokinesinflammationmicemicrogliaserumstroke-related genes

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Area of Science:

  • Neuroscience
  • Immunology
  • Regenerative Medicine

Background:

  • Stroke involves inflammatory mediators like TNF and IL-1Ra.
  • Cell-based therapies, particularly using bone marrow (BM) cells, show promise for stroke treatment.
  • Previous studies suggest BM cells with high IL-1Ra expression reduce stroke infarcts.

Purpose of the Study:

  • To investigate the effect of BM cells on TNF and other stroke-related mediators.
  • To analyze the interaction between TNF and IL-1Ra in microglial cells.
  • To understand the role of BM cells in modulating post-stroke inflammation.

Main Methods:

  • Transient middle cerebral artery occlusion (tMCAo) model in mice.
  • In vitro studies using adult microglial cultures.
  • Analysis of stroke-related genes and inflammatory mediators via qPCR, electrochemiluminescence, and ELISAs.
  • Hierarchical clustering and STRING analysis for gene and protein interactions.

Main Results:

  • BM treatment increased TNF, IL-10, and IL-4 levels.
  • BM treatment decreased CXCL1, IL-12p70, and TLR2 levels, indicating an anti-inflammatory shift.
  • A correlation and colocalization between microglial TNF and IL-1Ra were observed, with IL-1Ra production being TNF-independent.
  • BM cells modulated TNF levels independently of TLR2.

Conclusions:

  • BM cells act as modulators of post-stroke inflammation.
  • BM treatment promotes an anti-inflammatory environment, potentially improving stroke outcomes.
  • TNF and IL-1Ra are identified as crucial players in the defense response following stroke.