Indium 111 toxicity in the human lymphocyte.

Area of Science:

• Immunology
• Nuclear Medicine
• Cytogenetics

Background:

• Lymphocyte function is crucial for immune response.
• Radiolabeling is used in diagnostic imaging and cell tracking.
• The safety of radiolabeled cells in diagnostic procedures requires thorough evaluation.

Purpose of the Study:

• To assess the impact of Indium-111 (111In) labeling on lymphocyte viability and function.
• To determine if 111In activities used in diagnostics cause cellular abnormalities.

Main Methods:

• Lymphocytes were labeled with 111In across a range of activities (0.2 to 500 muCi/10(8) cells).
• Assessed lymphocyte response to mitogens.
• Evaluated immunoglobulin synthesis, mitotic index, and chromosome aberrations.

Main Results:

• All tested lymphocyte functions were abnormal following 111In labeling.
• Chromosome aberrations were observed.
• Abnormalities occurred at 111In activities within diagnostic ranges.

Conclusions:

• Lymphocyte labeling with 111In can induce significant cellular dysfunction and genotoxicity.
• Current diagnostic 111In labeling protocols may pose risks to lymphocyte integrity.
• Further research is needed to mitigate these effects in clinical applications.