IL-17 is a CD4 T cell-derived pro-inflammatory and pro-angiogenic cytokine that further promotes IL-6 production and VEGF-mediated angiogenesis .
Both pro-inflammatory and anti-inflammatorycytokines were detected in the mouse urine following inflammation induced by BCG, TNF-α, and LPS.
It is not clear whether BCG induces the release of a unique set of cytokines apart from its pro-inflammatory effects.
Together, these results indicate that bladder instillation with BCG or TNF-α induce a classical inflammatory response, as previously described for LPS .
Previous studies have shown that a non-HS-binding mutant form of the inflammatorychemokineCCL7 can block inflammation produced by wild-type chemokines.
The current study was designed to assess the potential of the non-HS-binding form of the homeostatic chemokineCXCL12 to modulate normal chemokine-mediated inflammation.
Together, these data suggest that systemic administration of non-HS-binding CXCL12 is able to inhibit localized, CXCL12-mediated inflammation within the air pouch.
However, the mixture of either of these mutants with wild-type chemokines can abrogate the potential of the latter to induce transendothelial leukocyte migration in vitro and normal chemokine-mediated inflammation in vivo .
Signaling through CD137L plays a critical role in the differentiation of myeloid cells and their cellular activities, suggesting that CD137L signals trigger and sustain inflammation.
I also discuss how signaling through CD137 and CD137L result in inflammation, for which interference of the CD137 and CD137L pathway may provide a promising therapeutic tool.
Inflammation amplified by CD137L in turn may contribute to enhancement of T cell activities together with CD137 signals by increasing expression levels of other costimulatory molecules, MHC, cell adhesion molecules, and cytokines in antigen-presenting cells.
The overall consequence might be that the amplified inflammation by CD137L enhances the T-cell activity together with CD137 signals by upregulating costimulatory molecules, MHC molecules, cell adhesion molecules, cytokines, and chemokines.
Elevated mucosal IL-12/23p40 and IFN-gamma accompany early inflammation in IL-10-deficient (IL-10(-/-)) mice and then later decline while inflammation persists.
IL-10 is important for suppressing inflammation after transfer at 3 weeks of age and limiting inflammation after transfer at 12 weeks but has little influence at 30 weeks of age.
Ultrabarrier-housed IL-10(-/-) mice are statistically indistinguishable from WT mice by weight, disease activity index, and histologic inflammation.
Pro-inflammatorycytokines, such as tumor necrosis factor (TNF)α, interleukin (IL)-1, IL-6, IL-12, granulocyte macrophage colony stimulating factor (GM-CSF) and interferon (IFN)γ, induce both acute and chronic inflammatory responses; the chemokines MIP(macrophage inflammatory protein)-1α and RANTES (Regulated on Activation, Normal T Expressed and Secreted) are involved in the chemotaxis of leucocytes; and anti-inflammatorycytokines, such as IL-4, IL-10 and transforming growth factor (TGF)β, limit the magnitude and the extent of inflammation .
IL-10 is a pleiotropic cytokine that has dominant suppressive effects on the production of pro-inflammatorycytokines by monocytes .
TNFα is essential for normal host defense in mediating inflammatory and immune responses .
IL-1α is a pro-inflammatory mediator distinct from IL-1β that is produced by monocytes after various stimulation .
These Foxp3+ cells appear to play a functional role in protection from IL-23-independent inflammation because transfer of Foxp3-deficient T cells to Il23a−/−Rag1−/− hosts induces severe colitis, indistinguishable from disease induced after T cell transfer into IL-23-sufficient Rag1−/− recipients.
Furthermore, IL-23-independent intestinal inflammation could develop if immunosuppressive pathways were reduced.
Unexpectedly, our results demonstrate that IL-23 reduces the frequency of Foxp3+ cells in the intestine and that in the absence of regulatory T (Treg) cells, IL-23 is dispensable for intestinal inflammation.
In addition, the absence of IL-23 did not significantly alter the intestinal amounts of IL-17 or the relative expression of RORγt in this model, suggesting that IL-23 can promote intestinal inflammation independently of its role in promoting Th17 cells.
Here we show for the first time that TNFα-triggered inflammation in vivo can be attenuated by targeting PLD1.
Localized cytokines and chemokines amplify the inflammatory response, by promoting vascular permeability and the influx of immune cells into the affected area.
We recently reported that in human monocytes, TNFα activates the Phosphatidylcholine-specific Phospholipase D1 (PLD1), and showed that inhibition of PLD-generated active products, or genetic-silencing of PLD1, largely inhibits TNFα-triggered key intracellular signaling pathways pivotal in the TNFα-mediated proinflammatory responses, suggesting a potential role for PLD1 in TNFα-mediated inflammation .
These novel data demonstrate a critical role for PLD1 in TNFα-induced inflammation in vivo and warrant further investigation.
IL-4 is an
anti-inflammatorycytokine that inhibits the
onset and severity in different experimental
arthritis models.
All these inflammatory cells contribute to articular damage by cytokine and proteolytic enzyme production [].
Nevertheless, in the pathogenesis of GBS arthritis a crucial role is played by inflammatory cells (granulocytes and monocytes) that reach the joints [, ] and by the production of proinflammatory cytokines, including interleukin-6 (IL-6) IL-1β and tumor necrosis factor-α (TNF-α) [].
Fiévez L …
,
Desmet C,
Henry E,
Pajak B,
Hegenbarth S,
Garzé V,
Bex F,
Jaspar F,
Boutet P,
Gillet L,
Vanderplasschen A,
Knolle PA,
Leo O,
Moser M,
Lekeux P, Bureau F » «
Proinflammatory cytokines, such as interleukin (IL)-6, IL-8, IL-1 beta and tumor necrosis factor-alpha play important roles in acute coronary syndrome by regulating inflammation, cellular adhesion and production of growth factors and various vasoactive substances.
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