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2-Chloroadenosine: a selective lethal effect to mouse macrophages and its mechanism
Journal of Immunology (Baltimore, Md. : 1950)
|March 1, 1985
Summary
2-chloroadenosine (2-Cl Ado) rapidly depletes ATP in mouse macrophages, causing cell death. This lethal effect on peritoneal cells (PC) is preventable with adenosine (Ado) or coformycin, suggesting adenosine starvation as the cause.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Purine compounds modulate immune responses.
- Peritoneal cells (PC) include macrophages, crucial immune cells.
- Adenosine (Ado) plays a role in cellular energy and immune function.
Purpose of the Study:
- To investigate the in vitro effects of 2-chloroadenosine (2-Cl Ado) on mouse peritoneal cells.
- To determine the mechanism behind the observed lethal effect of 2-Cl Ado on adherent PC.
- To explore the role of adenosine metabolism in 2-Cl Ado-induced cytotoxicity.
Main Methods:
- Exposure of mouse adherent peritoneal cells (macrophages) to 2-Cl Ado.
- Measurement of intracellular adenosine triphosphate (ATP) levels.
- Assessment of cell viability following treatment with 2-Cl Ado, adenosine (Ado), and coformycin.
- Comparison with cells treated with monoiodoacetate (MIA) and NaN3.
Main Results:
- 2-Cl Ado exhibited a potent lethal effect specifically on adherent PC (macrophages).
- A rapid decrease in intracellular ATP content was observed in PC treated with 2-Cl Ado.
- The lethal effect and ATP depletion were prevented by exogenous Ado or coformycin (adenosine deaminase inhibitor).
- Polymorphonuclear cells and lymphocytes were not affected by 2-Cl Ado.
Conclusions:
- The lethal effect of 2-Cl Ado on adherent PC is attributed to a rapid decrease in intracellular ATP levels.
- 2-Cl Ado likely competes with intracellular adenosine, leading to adenosine starvation and subsequent ATP depletion in macrophages.
- These findings highlight a specific mechanism of purine analog toxicity in immune cells.