[Effect of chloroquine on polyanions]

Area of Science:

• Biochemistry
• Pharmacology
• Cell Biology

Context:

• Chloroquine is an antimalarial drug with known interactions with nucleic acids.
• Mucopolysaccharidosis is a group of genetic disorders characterized by the accumulation of glycosaminoglycans.
• Polyanions are negatively charged polymers crucial in various biological processes.

Purpose:

• To investigate the binding affinity of chloroquine to polyanions, specifically glycosaminoglycans.
• To explore the potential of using chloroquine's polyanion binding for diagnostic or therapeutic applications in mucopolysaccharidosis.

Summary:

• Spectrophotometric analysis revealed that chloroquine forms complexes with glycosaminoglycans more readily than the metachromatic dye pseudoisocyanine.
• Chloroquine treatment significantly reduced the fluorescence of glycosaminoglycan inclusion bodies in leukocytes of a mucopolysaccharidosis patient.
• In vitro, chloroquine accelerated blood clotting, indicating an inactivation of polyanions.

Impact:

• Demonstrates a novel spectrophotometric method for detecting chloroquine-polyanion interactions.
• Provides evidence for chloroquine's potential to modulate glycosaminoglycan metabolism and associated cellular pathology.
• Suggests a mechanism of polyanion inactivation by chloroquine, with implications for understanding its biological effects.