Immunofluorescence and subsequent confocal microscopy of intracellular TNF in human neutrophils

Area of Science:

• Cell biology
• Immunology
• Microscopy

Background:

• Immunofluorescence is crucial for visualizing protein expression, localization, and colocalization within cells.
• Tumor necrosis factor-alpha (TNF) plays a significant role in inflammatory responses, particularly in neutrophils.

Purpose of the Study:

• To describe a robust immunofluorescence and confocal microscopy technique for detecting TNF in human neutrophils (polymorphonuclear leukocytes; PMN).
• To enable qualitative observation of TNF expression pattern changes in leukocytes from resting to stimulated states.
• To facilitate the assessment of TNF colocalization with other cellular components.

Main Methods:

• Utilizing immunofluorescence staining on human neutrophils (PMN).
• Employing confocal microscopy for high-resolution imaging of protein localization.
• Applying the technique to both resting and stimulated leukocyte samples.

Main Results:

• Successfully visualized the expression and localization of TNF in human neutrophils.
• Demonstrated the ability to observe dynamic changes in TNF expression patterns upon cell stimulation.
• Confirmed the feasibility of assessing TNF colocalization with other cellular targets.

Conclusions:

• The described immunofluorescence and confocal microscopy technique is effective for studying TNF in human neutrophils.
• This method provides valuable insights into TNF's role and behavior in leukocyte function.
• The technique is efficient, achievable within 1-2 days, and adaptable for various colocalization studies.