Isolation of human NK cells by density gradient centrifugation

Area of Science:

• Immunology
• Cell Biology

Background:

• Human Natural Killer (NK) cells are crucial for innate immunity.
• Identifying and isolating NK cells is essential for studying their function.
• Large granular lymphocytes (LGLs) are recognized as the primary NK cells in human peripheral blood.

Purpose of the Study:

• To investigate the sedimentation characteristics of human NK cells.
• To determine the optimal method for isolating NK cells for functional assays.
• To analyze the relationship between NK cells and other peripheral blood mononuclear cells.

Main Methods:

• Discontinuous Percoll density gradient centrifugation was employed.
• Sedimentation properties of NK cells were analyzed.
• NK cell activity was assessed against the K-562 leukaemic cell line.

Main Results:

• NK cell activity demonstrated a distinct peak in a single low-density fraction.
• This fraction was predominantly composed of large granular lymphocytes.
• Percoll density gradient centrifugation effectively separated NK cells from other mononuclear cells.

Conclusions:

• Percoll density gradient centrifugation is a valuable technique for isolating and analyzing human NK cells.
• This method facilitates the study of NK cell function and their interactions within the peripheral blood mononuclear cell population.