Emerging roles for platelets as immune and inflammatory cells

Area of Science:

• Hematology
• Immunology
• Vascular Biology

Background:

• Platelets are anucleate cells with critical roles beyond hemostasis.
• They function as immune cells, influencing vascular inflammation and diseases like atherosclerosis and rheumatoid arthritis.
• Platelets exhibit both protective and detrimental roles in infectious disease pathogenesis.

Purpose of the Study:

• To review platelet interactions with the immune system (innate and acquired).
• To discuss platelet-vessel wall interactions in driving inflammatory diseases.
• To focus on emerging concepts of platelet immune and inflammatory functions in infectious diseases.

Main Methods:

• Literature review of recent publications on platelet function in inflammation and infection.
• Synthesis of data on platelet interactions with immune cells and the vascular wall.
• Analysis of current understanding of platelet roles in various inflammatory and infectious conditions.

Main Results:

• Platelets are central mediators of thrombosis and initiate/accelerate vascular inflammation.
• Platelet immune functions can be protective or contribute to adverse outcomes in inflammatory and infectious diseases.
• Emerging evidence highlights significant, often dual, roles of platelets in combating and exacerbating infections.

Conclusions:

• Platelets possess multifaceted immune capabilities impacting vascular health and disease.
• Understanding platelet roles in infectious diseases is crucial due to their global health significance.
• Further research into platelet immune functions offers therapeutic potential for inflammatory and infectious conditions.