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Purines and neutrophil leukocytes
1Department of Physiology and Pharmacology, Karolinska Institute, Stockholm, Sweden.
General Pharmacology
|March 1, 1997
Summary
Adenosine and ATP modulate neutrophil functions through purinergic receptors. These signaling molecules influence neutrophil activity, impacting immune responses and potential drug targets.
Area of Science:
- Biochemistry
- Immunology
- Pharmacology
Background:
- Adenosine and ATP are naturally present in body fluids, with levels increasing during hypoxia and ischemia.
- Endothelial cells and neutrophils release adenosine and ATP upon physiological stimulation.
- Neutrophils express adenosine and P2 purinergic receptors crucial for immune cell function.
Purpose of the Study:
- To investigate the role of adenosine and ATP in modulating human neutrophil leukocyte functions.
- To explore the mechanisms by which purinergic signaling affects neutrophil behavior.
Main Methods:
- Analysis of adenosine and ATP release from neutrophils and endothelial cells.
- Examination of neutrophil responses to adenosine and ATP, including intracellular calcium levels, degranulation, and oxidative burst.
- Investigation of neutrophil adhesion to the endothelium.
Main Results:
- ATP triggers increased intracellular calcium, degranulation, enzyme release, oxidative burst, and endothelial adhesion in neutrophils.
- ATP is metabolized to adenosine by ecto-enzymes.
- Adenosine binding to A1 receptors enhances neutrophil chemotaxis.
- Adenosine binding to A2A receptors reduces neutrophil oxidative burst, degranulation, and endothelial adhesion.
Conclusions:
- Adenosine and adenine nucleotides are key endogenous regulators of neutrophil functions.
- Purinergic receptors on neutrophils represent significant targets for pharmacological interventions.