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Isolation and Characterization of Dendritic Cells and Macrophages from the Mouse Intestine
Published on: May 21, 2012
CD43 potentiates CD3-induced proliferation of murine intestinal intraepithelial lymphocytes
E U Bagriacik1, M Tang, H C Wang
1Department of Biological Science, University of Tulsa, Tulsa, Oklahoma, USA.
Insights
CD43 acts as a coactivational signal for mouse intestinal intraepithelial lymphocytes (IEL), enhancing their proliferation. This suggests CD43 plays a key role in IEL responses, especially when other co-stimulatory molecules are absent.
Area of Science:
- Immunology
- Cell Biology
Background:
- Intestinal intraepithelial lymphocytes (IEL) are crucial for gut immunity.
- Understanding IEL proliferation is key to immune response modulation.
- The role of CD43 in IEL activation requires further investigation.
Purpose of the Study:
- To investigate the role of CD43 in the proliferation of murine IEL.
- To determine if CD43 acts as a coactivational signal for IEL.
Main Methods:
- In vitro cell cultures of murine IEL.
- Stimulation with anti-CD3 antibody in the presence of IL-2 and/or IL-15.
- Assessment of cell proliferation via thymidine incorporation.
- Analysis of CD43 triggering effects on proliferation.
Main Results:
- CD3 stimulation alone induced minimal IEL proliferation without cytokines.
- IL-2 or IL-15 enhanced CD3-induced proliferation.
- Combined IL-2 and IL-15 synergistically increased proliferation threefold.
- CD43 triggering significantly enhanced CD3-induced proliferation, indicating a coactivational role.
Conclusions:
- CD43 functions as a significant coactivational signal for murine IEL proliferation.
- IEL proliferative responses are dependent on the combination of signals received.
- CD43 may be a critical molecule for high-level IEL proliferation, particularly in the absence of CD28.
Abstract:
The involvement of CD43 in cell proliferation of murine intestinal intraepithelial lymphocytes (IEL) has been studied in in vitro CD3-stimulated cell cultures. In the presence of either IL-2 or IL-15, CD3 stimulation of IEL resulted in low levels of proliferation as measured by thymidine incorporation, whereas no proliferation occurred upon CD3 stimulation in the absence of cytokines. The combination of both cytokines to IEL cultures synergistically enhanced CD3-induced proliferation by approximately threefold that of cultures supplemented with either cytokine alone. Most importantly, however, proliferation of IEL was significantly greater when CD3 stimulation occurred in conjunction with CD43 triggering, indicating that CD43 functions as a coactivational signal for murine IEL. These findings indicate that a spectrum of potential proliferative responses exist among murine IEL depending on the types and combinations of signals received, and that because under normal conditions murine IEL are largely devoid of CD28 expression, a classical T-cell coactivational molecule, the capacity for high-level IEL proliferation may reside with CD43.
