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Summary
Histidinoalanine, a protein cross-linker, was found in human urine. Concentrations varied by age, with newborns having the highest levels, suggesting developmental differences in connective tissue metabolism.
Area of Science:
- Biochemistry
- Human Physiology
- Connective Tissue Research
Background:
- Histidinoalanine is a unique amino acid residue formed by the cross-linking of histidine and alanine residues.
- It plays a structural role in connective tissue proteins, contributing to their integrity and mechanical properties.
- The presence and levels of specific biomarkers in urine can offer insights into systemic metabolic processes.
Purpose of the Study:
- To detect and quantify histidinoalanine in human urine samples.
- To investigate potential age-related differences in urinary histidinoalanine levels.
- To explore the possible origins and implications of urinary histidinoalanine.
Main Methods:
- Acid hydrolysis of human urine samples.
- Quantification of histidinoalanine using analytical techniques (details not specified in abstract).
- Measurement of creatinine for normalization of results.
Main Results:
- Histidinoalanine was successfully detected in the acid hydrolysate of human urine.
- Urinary histidinoalanine concentrations were highest in newborns (1.33 ± 0.27 nmol/mg creatinine).
- Children (0.77 ± 0.23 nmol/mg creatinine) and adults (0.89 ± 0.33 nmol/mg creatinine) showed lower, comparable levels.
Conclusions:
- Urinary histidinoalanine is present in humans across different age groups.
- Age-dependent variations in urinary histidinoalanine suggest dynamic changes in connective tissue turnover or metabolism during development.
- Further research is warranted to elucidate the precise metabolic pathways and physiological significance of histidinoalanine excretion.