Attention deficit disorders: a study of peptide-containing urinary complexes

Area of Science:

• Biochemistry
• Neuroscience
• Pediatrics

Background:

• Abnormal urinary peptide and protein-associated peptide complexes are observed in behavioral disorders.
• Gel filtration patterns of these urinary substances show disorder-specific characteristics.

Purpose of the Study:

• To investigate urinary peptide-containing complexes in children diagnosed with attention deficit disorder (ADD), with or without hyperactivity.
• To identify potential biochemical markers for differentiating ADD subtypes.

Main Methods:

• Gel filtration analysis of urinary precipitates from 104 children (91 boys, 13 girls) with ADD and 36 healthy controls.
• Clinical, neuropsychological, and psychophysiological assessments for patient selection.
• Purification and functional analysis of a specific urinary peptide fraction from hyperactive patients.

Main Results:

• Urinary gel filtration patterns in ADD patients differed significantly from controls.
• Increased benzoic acid-glycoprotein-peptide complexes were found in 64 patients with attention deficit disorder with hyperactivity (ADDH).
• Reduced uric acid complexes were observed in 35 patients, primarily those with ADD without hyperactivity.
• A purified peptide fraction from hyperactive patients enhanced platelet uptake of 14C[5-HT].

Conclusions:

• Urinary peptide complex patterns show promise as potential diagnostic biomarkers for attention deficit disorder subtypes.
• Further research is warranted to validate these findings for clinical diagnostic applications.
• Biochemical analysis of urinary peptides may aid in the diagnosis of behavioral disorders like ADD.