Cyclosporin A and rapamycin are each used as T cell immunosuppressants. They share the property of binding to immunophilin molecules in T cells as the initial step in their mechanisms of action. However, in the case of cyclosporin A, the drug:immunophilin complex binds to and inhibits the protein phosphatase calcineurin, whereas the rapamycin:immunophilin complex binds to and inhibitors mTOR. As a consequence, Cyclosporin A, but not rapamycin, blocks cytokine production by T cells. Both cyclosporin A and rapamycin block cytokine production by T cells. Rapamycin, but not cyclosporin A, blocks T cell proliferation.
Cyclosporin A and rapamycin are each used as T cell immunosuppressants. They share the property of binding to immunophilin molecules in T cells as the initial step in their mechanisms of action. However, in the case of cyclosporin A, the drug:immunophilin complex binds to and inhibits the protein phosphatase calcineurin, whereas the rapamycin:immunophilin complex binds to and inhibitors mTOR. As a consequence, Cyclosporin A, but not rapamycin, blocks cytokine production by T cells. Both cyclosporin A and rapamycin block cytokine production by T cells. Rapamycin, but not cyclosporin A, blocks T cell proliferation.
Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN:9781305251052
Author:Michael Cummings
Publisher:Michael Cummings
Chapter17: Genes And The Immune System
Section: Chapter Questions
Problem 11QP: It is often helpful to draw a complicated pathway in the form of a flow chart to visualize the...
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Cyclosporin A and rapamycin are each used as T cell immunosuppressants. They share the property of binding to immunophilin molecules in T cells as the initial step in their mechanisms of action. However, in the case of cyclosporin A, the drug:immunophilin complex binds to and inhibits the protein phosphatase calcineurin, whereas the rapamycin:immunophilin complex binds to and inhibitors mTOR. As a consequence,
- Cyclosporin A, but not rapamycin, blocks cytokine production by T cells.
- Both cyclosporin A and rapamycin block cytokine production by T cells.
- Rapamycin, but not cyclosporin A, blocks T cell proliferation.
- Neither rapamycin nor cyclosporin A block T cell proliferation.
- Both cyclosporin A and rapamycin inhibit co-stimulatory signaling through CD28 on T cells.
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