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Elevated blood pressure positively associates with alpha-1 microglobulin in prepubescent children: the ExAMIN Youth

Ashleigh Craig1, Lebo Gafane-Matemane1,2, Wayne Smith1,2

  • 1Hypertension in Africa Research Team (HART).

Journal of Hypertension
|December 3, 2021
PubMed

Insights

Alpha-1 microglobulin (A1M), a marker of kidney function, was higher in Black children, correlating with elevated blood pressure. This suggests A1M may help identify children at risk for hypertension and kidney damage.

Area of Science:

  • Pediatric Nephrology
  • Cardiovascular Health in Children
  • Racial Disparities in Health

Background:

  • Hypertension is an increasing concern in children, particularly those of African descent.
  • Kidney function is integral to blood pressure regulation.
  • Alpha-1 microglobulin (A1M) serves as a marker for proximal tubular function.

Purpose of the Study:

  • To compare A1M levels between healthy Black and White children (aged 5-9 years).
  • To investigate the association between A1M and blood pressure in these groups.
  • To explore A1M's utility as an early indicator of hypertension risk in children.

Main Methods:

  • Cross-sectional study comparing A1M levels and blood pressure in 957 healthy Black and White children.
  • Utilized multiple and binary logistic regression analyses to assess associations.
  • Controlled for age, sex, BMI z-score, and body height in statistical models.

Main Results:

  • Black children exhibited significantly higher A1M levels and diastolic blood pressure (DBP) compared to White children.
  • A1M positively associated with systolic blood pressure (SBP) and DBP in Black children.
  • Increased A1M levels were linked to a 28% higher likelihood of elevated blood pressure in Black children, independent of other factors.

Conclusions:

  • A1M is an important marker for proximal tubular function, especially relevant in Black children with elevated blood pressure.
  • Highlights the need for early blood pressure screening in children to prevent hypertension and kidney damage.
  • Suggests A1M may aid in identifying children at risk for developing hypertension and associated kidney issues.
Abstract

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