Impact of age, gender, and race on circulating γδ T cells

Area of Science:

• Immunology
• Human Genetics

Background:

• A subset of human peripheral blood γδ T cells, expressing the Vγ2Vδ2 T cell receptor, plays a role in responding to malignant and infectious diseases.
• Previous research has not fully elucidated the demographic variations in Vγ2Vδ2 T cell populations.

Purpose of the Study:

• To investigate the impact of race and age on the levels of Vγ2Vδ2 T cells in healthy human peripheral blood.
• To compare Vγ2Vδ2 T cell populations between Caucasian and African American donors.

Main Methods:

• Analysis of peripheral blood samples from healthy Caucasian and African American donors.
• Quantification of Vγ2Vδ2 T cells as a percentage of total lymphocytes.
• Assessment of Vγ2 clonotypes and T cell receptor expression.

Main Results:

• Significant differences observed in Vγ2Vδ2 T cell numbers between Caucasian (3.71% ± 4.37%) and African American (1.18% ± 2.14%) donors (p < 0.0001).
• Age and race were the primary factors influencing Vδ2 cell levels, with age-related effects being consistent across racial groups.
• The Vγ2Vδ2 T cell population was predominantly composed of cells expressing the Vγ2-Jγ1.2 Vδ2 T cell receptor in both groups, indicating strong positive selection.

Conclusions:

• Clinical studies involving Vγ2Vδ2 T cells require age- and race-matched controls due to significant demographic variations.
• Further research is needed to understand the regulatory mechanisms governing circulating Vγ2Vδ2 T cell levels.