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This summary is machine-generated.

Iron deficiency is common in pulmonary arterial hypertension (PAH) patients, but hepcidin regulation remains normal regardless of BMPR2 gene variants. This study found iron homeostasis is largely independent of BMPR2 in PAH.

Keywords:
geneticshepcidiniron homeostasispulmonary vascular disease

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Area of Science:

  • Cardiology
  • Genetics
  • Hematology

Background:

  • Idiopathic and heritable pulmonary arterial hypertension (I/HPAH) frequently present with iron deficiency.
  • Hepcidin, an iron-regulating hormone, is influenced by BMP/SMAD signaling, including BMPR-II, a gene with common pathogenic variants in HPAH.
  • The impact of BMPR2 variants on hepcidin levels in I/HPAH patients was previously unexamined.

Purpose of the Study:

  • To investigate iron metabolism and hepcidin regulation in I/HPAH patients with and without BMPR2 pathogenic variants.
  • To compare hepcidin levels and iron status between I/HPAH patient groups and healthy controls.

Main Methods:

  • Cross-sectional study involving 109 participants (23 BMPR2 variant-carriers, 56 BMPR2 non-carriers, 30 healthy controls).
  • Quantification of serum hepcidin levels using enzyme-linked immunosorbent assay.
  • Measurement of iron status, inflammatory markers (IL6), erythropoietin, BMP2, BMP6, and BMPR-II (protein and mRNA).

Main Results:

  • A high prevalence of iron deficiency (84%) was observed in I/HPAH patients, necessitating iron supplementation.
  • No significant differences in hepcidin levels were found between I/HPAH patients (with or without BMPR2 variants) and healthy controls.
  • Hepcidin levels correlated with the degree of iron deficiency, not with IL6, erythropoietin, BMP2, or BMP6 levels.
  • BMPR2 variant status did not influence hepcidin levels or iron regulation.

Conclusions:

  • Iron homeostasis and hepcidin regulation are generally preserved in I/HPAH patients, irrespective of BMPR2 pathogenic variants.
  • The high prevalence of iron deficiency in I/HPAH is not due to dysregulated hepcidin.
  • These findings suggest a physiologically normal iron regulation in I/HPAH patients, independent of BMPR2 gene status.