Related Experiment Videos
Interleukin 13, a T-cell-derived cytokine that regulates human monocyte and B-cell function
A N McKenzie1, J A Culpepper, R de Waal Malefyt
1Department of Molecular Biology, DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94304-1104.
Summary
Researchers identified a novel secreted protein, interleukin 13 (IL-13), from human T-cells. This protein modulates monocyte morphology and stimulates B-cell proliferation and immunoglobulin production.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- A mouse helper T-cell-specific cDNA sequence, P600, has a human homologue.
- Understanding T-cell-derived immunoregulatory proteins is crucial for immune system research.
Purpose of the Study:
- To isolate and characterize the human homologue of the mouse P600 sequence.
- To investigate the functional properties of the identified human protein in immune cells.
Main Methods:
- Isolation of human cDNA from an activated T-cell library.
- Expression and purification of the human protein.
- Functional assays using human monocytes and B cells, including proliferation and immunoglobulin production studies.
Main Results:
- The human cDNA encodes a secreted protein (approx. 10 kDa), designated interleukin 13 (IL-13).
- Both human and mouse proteins induce morphological changes in monocytes, upregulating MHC class II and Fc epsilon RII (CD23).
- IL-13 stimulates proliferation of activated human B cells and induces significant IgM and IgG production, but not IgA.
Conclusions:
- The novel protein, IL-13, is a potent immunoregulatory cytokine.
- IL-13 plays a significant role in B-cell activation, differentiation, and immunoglobulin synthesis.
- This discovery provides new insights into T-cell-mediated immune responses.