Post-ischemic stroke systemic inflammation: Immunomodulation by progesterone and vitamin D hormone

Area of Science:

• Neuroscience
• Immunology
• Endocrinology

Background:

• Post-stroke systemic inflammation increases stroke patient morbidity and mortality.
• In-hospital infections can exacerbate inflammation following a stroke.
• Peripheral immune dysfunction is a significant complication after stroke.

Purpose of the Study:

• To investigate the immunomodulatory effects of progesterone (P4) and vitamin D hormone (VDH) on post-stroke inflammation and deficits.
• To evaluate P4 and VDH, alone and in combination, for improving stroke outcomes.
• To assess the impact on peripheral immune dysfunction, behavioral deficits, and neuronal damage.

Main Methods:

• Adult rats underwent transient middle cerebral artery occlusion/reperfusion (tMCAO).
• Delayed systemic inflammation was induced using lipopolysaccharide (LPS).
• Animals were treated with P4 and/or VDH; outcomes measured included behavioral tests, immune cell analysis, infarction volume, and markers of neuronal inflammation and apoptosis.

Main Results:

• Stroke with systemic inflammation worsened outcomes compared to stroke alone.
• Both P4 and VDH monotherapy restored peripheral immune dysfunction.
• P4 monotherapy reduced infarction volume, functional deficits, and neuronal damage; P4+VDH combination therapy showed superior improvement.

Conclusions:

• Post-stroke systemic inflammation significantly impairs immune function and worsens stroke outcomes.
• Progesterone and vitamin D hormone therapy demonstrate immunomodulatory and neuroprotective effects.
• Combination therapy with progesterone and vitamin D hormone offers a promising strategy to improve stroke care and recovery.