Kupffer-cell activity is essential for thyroid hormone rat liver preconditioning.

Area of Science:

• Hepatology
• Immunology
• Endocrinology

Background:

• Ischemia-reperfusion (IR) injury is a significant clinical problem.
• Liver preconditioning strategies aim to mitigate IR injury.
• The role of Kupffer cells in T3-mediated liver preconditioning remains unclear.

Purpose of the Study:

• To investigate the necessity of Kupffer cell functioning in T3-induced liver preconditioning against warm IR injury.
• To determine if Kupffer cell inactivation abrogates the protective effects of T3.

Main Methods:

• Male Sprague-Dawley rats were used.
• Thyroid hormone (T3) administration was employed for preconditioning.
• Macrophage inactivation was achieved using gadolinium chloride (GdCl3).
• Liver injury was induced by 1-hour ischemia followed by 20-hour reperfusion.

Main Results:

• Ischemia-reperfusion significantly increased serum aspartate aminotransferase and tumor necrosis factor-alpha levels, induced liver damage, and reduced nuclear factor-kappaB DNA binding.
• T3 administration prior to IR suppressed these detrimental effects.
• Pretreatment with GdCl3 to eliminate Kupffer cells before T3 administration abolished T3's protective effects.
• Complete Kupffer cell elimination was confirmed 72 hours post-GdCl3 treatment.

Conclusions:

• Kupffer cell functioning is indispensable for T3-mediated liver preconditioning against IR injury.
• Hepatic macrophage inactivation prevents the protective effects of T3 in a warm IR injury model.
• Targeting Kupffer cells could be a strategy to modulate liver preconditioning responses.