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Published on: December 23, 2010
Leukotriene C4 binding to rat lung membranes
The Journal of Biological Chemistry
|August 25, 1983
Summary
Researchers identified a high-affinity binding site for leukotriene C4 (LTC4) in rat lung membranes. This binding site shows high specificity for LTC4, suggesting a potential physiological receptor involved in anaphylaxis.
Area of Science:
- Pharmacology
- Biochemistry
- Immunology
Background:
- Leukotriene C4 (LTC4) is a key mediator in anaphylaxis.
- Understanding LTC4's interactions is crucial for developing targeted therapies.
Purpose of the Study:
- To identify and characterize a binding site for LTC4 in rat lung membranes.
- To assess the specificity of this binding site for LTC4 and related molecules.
Main Methods:
- Membrane preparation from rat lung.
- [3H]LTC4 filtration binding assay.
- Competition studies with various leukotrienes, antagonists, and enzyme inhibitors.
Main Results:
- A saturable, specific, reversible, and heat-sensitive binding site for [3H]LTC4 was identified.
- The dissociation constant (KD) was 41 nM, with a maximum binding capacity (Bmax) of 31 pmol/mg protein.
- The binding site demonstrated high specificity for LTC4 over LTD4 and other related molecules.
Conclusions:
- The identified binding site likely represents a physiological receptor for LTC4.
- This receptor exhibits significantly lower affinity for LTD4, differentiating it from other known leukotriene receptors.
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