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Immunometabolic cues recompose and reprogram the microenvironment around implanted biomaterials.

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Biomaterial implants modulate immune cell behavior via immunometabolic cues, influencing inflammation and regeneration. Targeting cellular metabolism can steer immune responses toward a pro-regenerative state.

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Area of Science:

  • Biomaterials Science
  • Immunology
  • Metabolic Engineering

Background:

  • Immune cells, including monocytes and neutrophils, infiltrate tissues around biomaterials.
  • Chemokine receptors like CCR2 and CX3CR1 are crucial for immune cell trafficking and activation states.
  • The biomaterial microenvironment significantly impacts local immune responses and tissue regeneration.

Purpose of the Study:

  • To investigate how immunometabolic cues within biomaterial microenvironments regulate immune cell trafficking and function.
  • To elucidate the role of chemokine receptors (CCR2, CX3CR1) in immune cell composition and activation.
  • To determine if modulating immunometabolism can promote a pro-regenerative microenvironment.

Main Methods:

  • Utilized amorphous and crystalline polylactide implants.
  • Manipulated cellular metabolism, specifically glycolytic inhibition.
  • Analyzed immune cell populations (macrophages, dendritic cells, T cells) and their activation states.
  • Assessed chemokine receptor expression (CCR2, CX3CR1) and cytokine production (IL-4).

Main Results:

  • Immunometabolic cues, dependent on CCR2 and CX3CR1, govern immune cell trafficking and microenvironment composition.
  • Glycolytic inhibition in amorphous polylactide implants promoted a pro-regenerative state via myeloid cells.
  • In crystalline polylactide implants, arginase-1 expressing myeloid cells, T helper 2 cells, and γδ+ T cells shaped a pro-regenerative microenvironment.

Conclusions:

  • Local metabolic states are key regulators of inflammatory and regenerative processes in biomaterial settings.
  • Targeting immunometabolism offers a strategy to engineer biomaterial microenvironments for enhanced tissue regeneration.
  • Understanding immune cell dynamics and metabolic reprogramming is critical for designing next-generation biomaterials.