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Platelet selenium in children with normal and low selenium intake.

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Children with phenylketonuria or maple-syrup-urine disease and low selenium intake showed decreased selenium levels, particularly in platelets, suggesting a vital role for this trace element in platelet function.

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Area of Science:

  • Biochemistry
  • Pediatric Nutrition
  • Trace Element Metabolism

Background:

  • Phenylketonuria (PKU) and maple-syrup-urine disease (MSUD) are inherited metabolic disorders requiring strict dietary management.
  • Dietary interventions in these conditions can impact micronutrient status, including trace elements like selenium.
  • Selenium is an essential trace element with critical roles in antioxidant defense and thyroid hormone metabolism.

Purpose of the Study:

  • To investigate selenium concentrations in erythrocytes, platelets, and plasma of children with PKU or MSUD on specific diets.
  • To compare selenium levels in children with low versus normal selenium intake.
  • To explore the potential specialized role of selenium in platelets.

Main Methods:

  • Instrumental neutron activation analysis (INAA) was employed to quantify selenium concentrations.
  • Blood samples were analyzed for erythrocytes, platelets, and plasma.
  • Participants included eight children with PKU (n=6) or MSUD (n=2) and ten children with normal selenium intake.

Main Results:

  • Normal selenium concentration in platelets was approximately 600 ng/g, about five times higher than in erythrocytes.
  • Decreased platelet selenium concentrations were observed only when erythrocyte and plasma selenium levels were also very low.
  • Children with PKU or MSUD on low-selenium diets exhibited altered selenium distribution.

Conclusions:

  • Platelets maintain a higher selenium concentration compared to erythrocytes under normal conditions.
  • Platelet selenium levels appear to be a sensitive indicator of overall selenium status, potentially reflecting a specialized function.
  • Further research is warranted to elucidate the specific role of selenium in platelet physiology and its implications in metabolic disorders.