Effects of Caffeine on THP-1 Myelogenous Cell Inflammatory Gene Expression

Area of Science:

• Neonatal Medicine
• Pharmacology
• Immunology

Background:

• Caffeine is a standard treatment for apnea of prematurity in neonatal intensive care units.
• Beyond respiratory stimulation, caffeine exhibits anti-inflammatory properties.
• The anti-inflammatory effects of caffeine on monocytes in a pro-inflammatory state are not fully understood.

Purpose of the Study:

• To investigate caffeine's impact on inflammatory gene expression in THP-1 pre-monocytes stimulated with lipopolysaccharide (LPS).
• To compare the effects of caffeine administered before (prophylaxis) and after (treatment) LPS exposure.
• To determine optimal physiological caffeine concentrations for anti-inflammatory effects.

Main Methods:

• THP-1 pre-monocytes were exposed to LPS to mimic inflammation.
• Caffeine was administered at various physiological dosages, both pre-LPS and post-LPS.
• Quantitative analysis of pro-inflammatory gene expression (TNF-α, NF-κB, IL-8, PPARγ) was performed.

Main Results:

• Post-LPS caffeine treatment showed a dose-dependent decrease in TNF-α and NF-κB gene expression at concentrations of 50-100 μM.
• Pre-LPS caffeine administration (prophylaxis) reduced TNF-α and NF-κB gene expression across all tested concentrations.
• These findings suggest an optimal anti-inflammatory range for caffeine in monocytes.

Conclusions:

• Caffeine demonstrates significant anti-inflammatory effects on monocytes, reducing key pro-inflammatory gene expression.
• Caffeine's therapeutic potential extends to modulating inflammatory responses in gram-negative infections.
• These findings support caffeine's multifaceted role in neonatal care, impacting both respiratory and inflammatory pathways.