Which cell surface markers define helper T cells (CD4+) and cytotoxic T cells (CD8+) in flow cytometry?

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Study for the Success! In Clinical Laboratory Science – Immunology Test. Prepare with flashcards and multiple choice questions, each question offers hints and explanations. Get ready for your exam!

Multiple Choice

Which cell surface markers define helper T cells (CD4+) and cytotoxic T cells (CD8+) in flow cytometry?

Explanation:
In flow cytometry analyses of T cells, specific surface proteins define the two main subsets. Helper T cells express CD4 on their surface, while cytotoxic T cells express CD8. This allows you to distinguish the two populations by staining for CD4 and CD8 and identifying CD4-positive cells as helpers and CD8-positive cells as cytotoxic. CD3 is a marker that is present on most mature T cells, so it’s useful for selecting T cells in general, not for telling them apart. CD19 marks B cells, not T cells, so it’s not used to define helper versus cytotoxic T cells. In practice, you’d gate on CD3-positive T cells and then separate them into CD4-positive (helper) and CD8-positive (cytotoxic) subsets.

In flow cytometry analyses of T cells, specific surface proteins define the two main subsets. Helper T cells express CD4 on their surface, while cytotoxic T cells express CD8. This allows you to distinguish the two populations by staining for CD4 and CD8 and identifying CD4-positive cells as helpers and CD8-positive cells as cytotoxic. CD3 is a marker that is present on most mature T cells, so it’s useful for selecting T cells in general, not for telling them apart. CD19 marks B cells, not T cells, so it’s not used to define helper versus cytotoxic T cells. In practice, you’d gate on CD3-positive T cells and then separate them into CD4-positive (helper) and CD8-positive (cytotoxic) subsets.

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