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Substance P induced changes in CD74 and CD44 in the rat bladder
Katherine L Meyer-Siegler1, Pedro L Vera
1Research and Development Service, Bay Pines Veterans Affairs Medical Center, Bay Pines, Florida 33744, USA. Katherine.Siegler@med.va.gov
The Journal of Urology
|January 12, 2005
Summary
Substance P (SP) triggers bladder inflammation and macrophage migration inhibitory factor (MIF) release. MIF interacts with soluble CD44 and binds to CD74, driving proinflammatory effects in the bladder.
Area of Science:
- Urology
- Immunology
- Cell Biology
Background:
- Substance P (SP) is known to induce bladder inflammation.
- Macrophage migration inhibitory factor (MIF) is a proinflammatory cytokine released during SP-induced inflammation.
- The precise mechanism of MIF's action in bladder inflammation requires further elucidation.
Purpose of the Study:
- To investigate the mechanism of MIF action in SP-induced rat bladder inflammation.
- To examine changes in CD74, CD44, and phospho-ERK1/2 levels in the bladder.
- To determine the association between MIF, CD74, and CD44.
Main Methods:
- Rats were treated with SP or saline.
- Bladder tissue and intraluminal fluid (ILF) were collected.
- Immunohistochemistry and Western blot analysis were used to quantify MIF, CD74, CD44, and p-ERK1/2.
- ILF immunoprecipitation identified MIF-CD74/CD44 associations.
Main Results:
- SP induced significant MIF release and increased CD74 and CD44 expression in the bladder.
- SP treatment elevated bladder CD74 mRNA and protein, intracellular CD44, and p-ERK1/2.
- Soluble CD44 and MIF were detected in the ILF, with MIF associated with soluble CD44.
Conclusions:
- CD74 is present in the rat urothelium.
- SP upregulates CD74 and intracellular CD44, releasing soluble CD44 and MIF.
- MIF interacts with soluble CD44 and binds to CD74, mediating proinflammatory effects in bladder inflammation.