Biomaterials selectively modulate interactions between human blood-derived polymorphonuclear leukocytes and...

Area of Science:

• Biomaterials Science
• Immunology
• Cell Biology

Background:

• Biomaterial implantation triggers a foreign body response involving polymorphonuclear leukocytes (PMNs) and monocytes (MCs).
• Monocytes and macrophages are key in this response, secreting cytokines that influence healing.
• Existing in vitro models often overlook biomaterial effects on PMN-monocyte interactions.

Purpose of the Study:

• To investigate how biomaterials modulate paracrine and juxtacrine interactions between PMNs and MCs.
• To assess the impact of PMN-conditioned medium (PCM) on MC behavior on different biomaterials.
• To analyze direct co-cultures of PMNs and MCs on biomaterials.

Main Methods:

• Human blood-derived MCs cultured alone or with PCM on hydrogels, PDMS, and polystyrene.
• Direct co-culture of autologous PMNs and MCs on these biomaterials.
• Assessment of cell adhesion, viability, apoptosis, and cytokine expression (IL-1β, TNF-α, IL-6, IL-8).

Main Results:

• PCM enhanced MC adhesion, viability, and IL-1β/TNF-α expression in a biomaterial- and time-dependent manner.
• Direct co-cultures showed biomaterial- and time-dependent differences in cell behavior and cytokine profiles compared to monocultures.
• Biomaterials selectively modulated PMN-MC interactions, influencing cell adhesion, viability, apoptosis, and cytokine release.

Conclusions:

• Biomaterials significantly alter PMN-MC paracrine and juxtacrine signaling.
• These modulations impact key cellular processes and inflammatory mediator production.
• Understanding these interactions is crucial for designing biomaterials that promote favorable healing outcomes.