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HVA and MHPG in urine of premature infants
Insights
Premature infants and autistic children show higher urinary levels of homovanillic acid (HVA) and 3-methoxy-4-hydroxyphenylglycol (MHPG). Smaller infants had higher levels, suggesting immature dopaminergic receptors may explain these findings.
Area of Science:
- Biochemistry
- Neuroscience
- Pediatrics
Background:
- Elevated urinary homovanillic acid (HVA) and 3-methoxy-4-hydroxyphenylglycol (MHPG) have been noted in certain pediatric populations.
- These catecholamine metabolites are indicators of neurotransmitter activity.
Purpose of the Study:
- To investigate the levels of HVA and MHPG in premature infants compared to older children.
- To explore the relationship between infant size and urinary catecholamine metabolite levels.
- To consider the implications for dopaminergic receptor development.
Main Methods:
- Urine samples were collected from 12 premature infants and compared to older children.
- Infant data included age, sex, size, and head circumference.
- Levels of HVA and MHPG were quantified.
Main Results:
- Premature infants exhibited higher urinary concentrations of HVA and MHPG than older children.
- A negative correlation was found between infant size and HVA/MHPG levels; smaller infants had higher metabolite titers.
- Previously reported elevated HVA in autistic children was considered in light of these findings.
Conclusions:
- The findings suggest that elevated urinary HVA and MHPG in premature infants may be linked to an immaturity of dopaminergic receptors.
- This immaturity could potentially explain similar findings in autistic children, indicating a possible shared neurodevelopmental pathway.
Abstract:
Higher levels of homovanillic acid (HVA) and 3-methoxy-4-hydroxyphenylglycol (MHPG) were observed in urines of 12 premature infants than in older children. An examination of the influence of age, sex, size, and head circumference revealed that the smaller the infants, the higher the HVA and MHPG values. Recently several investigators have reported an increased titer of urinary HVA in autistic children. It has been hypothesized that the increased levels of catecholamine metabolites (notable HVA and MHPG) could reflect accelerated catecholamine turnover. The elevated urinary HVA titers in infants as well as in autistic children may be due to an immaturity of the dopaminergic receptors.