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2018 ; 8
(1
): 10287
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Naturally derived Heme-Oxygenase 1 inducers attenuate inflammatory responses in
human dendritic cells and T cells: relevance for psoriasis treatment
#MMPMID29980703
Campbell NK
; Fitzgerald HK
; Malara A
; Hambly R
; Sweeney CM
; Kirby B
; Fletcher JM
; Dunne A
Sci Rep
2018[Jul]; 8
(1
): 10287
PMID29980703
show ga
Psoriasis is a chronic autoimmune disease mediated by dysregulated immune
responses in dendritic cells (DC) and T cells. The stress-response enzyme heme
oxygenase-1 (HO-1) has been described as protective in animal models of
psoriasis, however, implementation of HO-1-based therapies is hindered by the
lack of clinically-suitable HO-1 inducers. The plant-derived polyphenols,
carnosol and curcumin, have been identified as candidate HO-1 inducers however
there has been little investigation into their effects on human immune cells. We
demonstrate that treatment of human DC with these polyphenols limits DC
maturation, reduces pro-inflammatory cytokine production, and prevents induction
of allospecific T cell responses, in a manner partially dependent on carbon
monoxide (CO). We also characterised their effects in ex-vivo psoriasis PBMC and
report that curcumin, but not carnosol, strongly reduces T cell proliferation and
cytokine poly-functionality, with reduced expression of psoriatic cytokines IFN?,
IL-17, GM-CSF and IL-22. This study therefore supports reports highlighting the
therapeutic potential of curcumin in psoriasis by providing insight into its
immunological effects on healthy human DC and psoriasis PBMC. We also
demonstrate, for the first time, the anti-inflammatory effects of carnosol in
human immune cells.