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2014 ; 26
(3
): 296-302
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Calcitriol May Down-Regulate mRNA Over-Expression of Toll-Like Receptor-2 and -4,
LL-37 and Proinflammatory Cytokines in Cultured Human Keratinocytes
#MMPMID24966627
Jeong MS
; Kim JY
; Lee HI
; Seo SJ
Ann Dermatol
2014[Jun]; 26
(3
): 296-302
PMID24966627
show ga
BACKGROUND: Although vitamin D analogs have been used in the topical treatment of
psoriasis, their mechanisms of action are not well understand. Calcitriol, the
hormonally active vitamin D3 metabolite, has been demonstrated to exert
immunomodulatory effects in the skin by down-regulating the expression of
Toll-like receptors (TLRs) and proinflammatory cytokines. OBJECTIVE: We
investigated the effects of calcitriol on the expression of TLR2, TLR4,
antimicrobial peptide LL-37, and proinflammatory cytokines in cultured human
keratinocytes. METHODS: The mRNA expression levels of TLR2, TLR4, tumor necrosis
factor ? (TNF-?), interleukin (IL)-1? and LL-37 in cultured human keratinocytes
were measured by real-time polymerase chain reaction (PCR) and reverse
transcription (RT). Furthermore, we measured supernatant TNF-? levels by an
enzyme-linked immunosorbent assay (ELISA) to confirm the effects of calcitriol on
TLR2 and TLR4. RESULTS: As measured by RT-PCR and real-time PCR, calcitriol was
found to suppress the lipopolysaccharide- and ultraviolet B radiation-mediated
induction of expression of TLRs, LL-37 and proinflammatory cytokines such as
TNF-? and IL-1? in normal human keratinocytes. The supernatant TNF-? levels
measured by ELISA were also suppressed after treatment with calcitriol.
CONCLUSION: Calcitriol may down-regulate inflammatory stated over-expression of
LL-37 and proinflammatory cytokines.