IL-8 analogue CXCL8 (3-72) K11R/G31P, modulates LPS-induced inflammation via AKT1-NF-kβ and ERK1/2-AP-1 pathways in THP-1 monocytes
IL-8 analogue CXCL8 (3-72) K11R/G31P, modulates LPS-induced inflammation via AKT1-NF-kβ and ERK1/2-AP-1 pathways in THP-1 monocytes
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Date
2018-08-17
Authors
Williams Walana
Jing-Jing Wanga
Iddrisu Baba Yabasinb
Michael Ntim
Sylvanus Kampo
Mahmoud Al-Azab
Abdalkhalig Elkhider
Eugene Dogkotenge Kuugbee
Jya-wei Cheng
John R. Gordon
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
IL-8 is elevated during inflammation, and it initiates cascade of down-stream reactions. Its antagonist, CXCL8
(3–72) K11R/G31P (G31P), represses inflammatory reactions via competitive binding to CXC chemokine family,
preferentially G protein-couple receptors (GPCRs) CXCR1/2. This study reports the effect of G31P on the
transcription profile of lipopolysaccharide (LPS) induced inflammation in THP-1 monocytes ex-vivo. LPS (1 μg/
ml) induced elevation of IL-8 was significantly reduced by G31P (20 μg/ml and 30 μg/ml), with relatively increased
inhibition of CXCR2 than CXCR1. Transcription of IL-1β, IL-6, and TNF-α were significantly inhibited,
while IL-10 remained relatively unchanged. G31P treatment also had repressing effect on the inflammatory
associated enzymes COX-2, MMP-2, and MMP-9. Significant restriction of c-Fos, and NF-kβ mRNA expression
was observed, while that of c-Jun was marginally elevated. Conversely, SP-1 mRNA expression was seen to
increase appreciably by G31P treatment. While the translation of pAKT, pERK1/2, and p65- NF-kβ were downregulated
by the G31P following THP-1 cells stimulation with LPS, reactive oxygen species (ROS) expression was
on the positive trajectory. Collectively, the IL-8 analogue, G31P, modulates the inflammatory profile of LPS
induced inflammation in THP-1 monocytes via AKT1-NF-kβ and ERK1/2-AP-1 pathways.