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Inflammatory Response01:28

Inflammatory Response

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An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
Inflammation can be triggered by various stimuli, such as impact, abrasion, chemical irritation, infections, and extreme hot or cold temperatures. These can damage cells and connective tissue fibers,...
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Retroductal Nanoparticle Injection to the Murine Submandibular Gland
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Matrix-Bound Nanovesicles Promote Prohealing Immunomodulation Without Immunosuppression.

Héctor Capella-Monsonís1,2,3, Raphael J Crum1,2, William D'Angelo1,2

  • 1McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.

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Summary

Matrix-bound nanovesicles (MBVs) do not impair adaptive immunity and enhance protection against Streptococcus pneumoniae infection. MBVs promote sustained immunomodulation in myeloid cells without compromising vaccine response.

Keywords:
adaptive immunitybacterial infectionextracellular matrixextracellular vesicleimmunomodulationinnate immunitymatrix-bound nanovesicles

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Area of Science:

  • Immunology
  • Extracellular Matrix Biology
  • Nanomedicine

Background:

  • Extracellular matrix (ECM) bioscaffolds modulate immune cells towards a prohealing phenotype.
  • Matrix-bound nanovesicles (MBVs), derived from ECM, show immunomodulatory effects on myeloid cells.
  • The impact of MBVs on adaptive immunity post-pathogen challenge remains unexplored.

Purpose of the Study:

  • To evaluate the effect of MBV administration on adaptive immune response following Streptococcus pneumoniae vaccination and infection.
  • To assess MBV's impact on humoral immunity and protection against lethal bacterial challenge.
  • To investigate the sustained immunomodulatory effects of MBVs on myeloid cells.

Main Methods:

  • Mice were vaccinated against S. pneumoniae and treated with MBVs or methotrexate (MTRX).
  • Humoral immune response (IgG, IgM titers) was measured.
  • Protection against lethal S. pneumoniae infection and immune cell populations in lungs were assessed.
  • Ex vivo analysis of bone marrow-derived macrophages from MBV-treated mice was performed.

Main Results:

  • MBV treatment did not alter antipneumococcal antibody titers compared to vaccine-only groups.
  • MBV-treated mice showed 50% protection against lethal S. pneumoniae infection.
  • MBV treatment modulated immune cell populations in the lungs and induced persistent immunomodulatory effects in macrophages.
  • Methotrexate treatment significantly decreased antibody titers.

Conclusions:

  • MBV treatment does not compromise the ability to mount an adaptive immune response.
  • MBVs offer protection against S. pneumoniae infection and induce sustained immunomodulation in myeloid lineage cells.
  • MBVs represent a promising therapeutic strategy for inflammatory diseases without impairing host defense mechanisms.