* Natural Killer (NK) Cells: These lymphocytes are part of the innate immune system. They target and destroy infected cells and cancer cells without the need for prior sensitization. They achieve this by releasing cytotoxic granules containing perforin and granzyme, which induce apoptosis in the target cell.
* Eosinophils: Primarily involved in fighting parasitic infections, eosinophils release toxic proteins and enzymes that damage parasites. They also play a role in allergic reactions.
* Basophils: These cells release histamine and other inflammatory mediators that contribute to allergic reactions and inflammation. They are involved in recruiting other immune cells to the site of infection.
* Mast Cells: Similar to basophils, mast cells release histamine and other substances, causing inflammation. They are found in tissues and play a critical role in allergic reactions and wound healing.
* Dendritic Cells: These cells act as messengers between the innate and adaptive immune systems. They phagocytize pathogens and present their antigens to T cells, initiating an adaptive immune response. While they are phagocytic, they primarily function as antigen-presenting cells rather than directly destroying pathogens.
* Complement Proteins: These are a group of proteins found in the blood that work together to lyse bacteria, attract phagocytes, and enhance inflammation. They are considered part of the innate immune system but do not directly destroy pathogens.
It's important to remember that the innate immune system relies on a coordinated effort of many different cells and molecules. While these are just some of the non-phagocytic cells involved, they play crucial roles in defending against pathogens and maintaining health.
