Reduced cortisol secretion in patients with iron deficiency

Area of Science:

• Endocrinology
• Hematology
• Biochemistry

Background:

• Cytochrome P-450, an iron-containing protein, is crucial for corticosterone synthesis in the adrenal cortex.
• Adrenal function and its regulation by hormones like ACTH are vital for physiological homeostasis.
• Iron deficiency can impact various metabolic processes, but its effect on the adrenal response to ACTH is not fully understood.

Purpose of the Study:

• To investigate the cortisol response to adrenocorticotropin (ACTH) stimulation in individuals with severe iron deficiency.
• To compare adrenal function between patients with iron deficiency and healthy controls.
• To assess the impact of iron supplementation on the cortisol response in iron-deficient patients.

Main Methods:

• Eleven patients with iron deficiency and 15 healthy controls underwent ACTH stimulation testing.
• Plasma cortisol levels were measured at baseline and at 30, 60, and 120 minutes post-ACTH infusion.
• The test was repeated in six iron-deficient patients after seven days of ferrous sulfate therapy.

Main Results:

• No significant difference in baseline cortisol levels was observed between patients and controls.
• Cortisol secretion and increment following ACTH stimulation were significantly lower in iron-deficient patients compared to controls, both before and after iron therapy.
• Iron therapy did not significantly alter baseline or stimulated cortisol levels in the iron-deficient group.

Conclusions:

• Severe iron deficiency is associated with diminished cortisol secretion following ACTH stimulation.
• This impaired adrenal response to ACTH stimulation persists despite short-term iron therapy.
• The findings suggest a potential disruption in the adrenal cortex's ability to respond to ACTH in severe iron deficiency.