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B10 cells decrease fibrosis progression following cardiac injury partially by IL-10 production and regulating

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B10 cells, producing IL-10, reduce cardiac fibrosis by enhancing hyaluronan and decreasing collagen. These findings suggest B10 cells are a promising therapeutic target for cardiac fibrosis.

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Area of Science:

  • Immunology
  • Cardiovascular Biology
  • Extracellular Matrix Biology

Background:

  • B10 cells are known for their anti-inflammatory roles via IL-10 production.
  • The specific impact of B10 cells on cardiac fibrosis remains largely unexplored.

Purpose of the Study:

  • To investigate the changes in B10 cell frequency during cardiac fibrosis.
  • To elucidate the role of B10 cells in the development and regression of cardiac fibrosis.

Main Methods:

  • Quantification of B10 cell frequency in cardiac injury models.
  • Assessment of fibrosis markers, including collagen deposition and hyaluronan levels.
  • In vivo studies involving hyaluronan manipulation and B10 cell adoptive transfer.
  • Analysis of macrophage (Mϕ) polarization in response to varying hyaluronan molecular weights.
  • Evaluation of cardiac fibrosis in CD19 knockout mice with altered B10 cell populations.

Main Results:

  • B10 cell frequency significantly increases during cardiac fibrosis.
  • B10 cells promote fibrosis regression by increasing IL-10, accelerating hyaluronan secretion, and inhibiting collagen deposition.
  • Hyaluronan's effect on macrophage polarization is dependent on its molecular weight.
  • Adoptive transfer of B10 cells attenuated collagen deposition, while CD19 deficiency exacerbated fibrosis.

Conclusions:

  • B10 cells exert potent antifibrotic effects in cardiac injury by modulating extracellular matrix composition.
  • B10 cells represent a potential therapeutic strategy for managing cardiac fibrosis.