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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Br+J+Pharmacol
2017 ; 174
(9
): 867-879
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Transient Receptor Potential Cation Channel Subfamily M Member 8 channels mediate
the anti-inflammatory effects of eucalyptol
#MMPMID28240768
Caceres AI
; Liu B
; Jabba SV
; Achanta S
; Morris JB
; Jordt SE
Br J Pharmacol
2017[May]; 174
(9
): 867-879
PMID28240768
show ga
BACKGROUND AND PURPOSE: Eucalyptol (1,8-cineol), the major ingredient in the
essential oil of eucalyptus leaves and other medicinal plants, has long been
known for its anti-inflammatory properties. Eucalyptol interacts with the TRP
cation channels among other targets, but it is unclear which of these mediates
its anti-inflammatory effects. EXPERIMENTAL APPROACH: Effects of eucalyptol were
compared in wild-type and TRPM8 channel-deficient mice in two different models:
footpad inflammation elicited by complete Freund's adjuvant (CFA) and pulmonary
inflammation following administration of LPS. Oedema formation, behavioural
inflammatory pain responses, leukocyte infiltration, enzyme activities and
cytokine and chemokine levels were measured. KEY RESULTS: In the CFA model,
eucalyptol strongly attenuated oedema and mechanical allodynia and reduced levels
of inflammatory cytokines (IL-1?, TNF-? and IL-6), effects comparable with those
of ibuprofen. In the LPS model of pulmonary inflammation, eucalyptol treatment
diminished leukocyte infiltration, myeloperoxidase activity and production of
TNF-?, IL-1?, IFN-? and IL-6. Genetic deletion of TRPM8 channels abolished the
anti-inflammatory effects of eucalyptol in both models. Eucalyptol was at least
sixfold more potent on human, than on mouse TRPM8 channels. A metabolite of
eucalyptol, 2-hydroxy-1,8-cineol, also activated human TRPM8 channels. CONCLUSION
AND IMPLICATIONS: Among the pharmacological targets of eucalyptol, TRPM8 channels
were essential for its anti-inflammatory effects in mice. Human TRPM8 channels
are more sensitive to eucalyptol than rodent TRPM8 channels explaining the higher
potency of eucalyptol in humans. Metabolites of eucalyptol could contribute to
its anti-inflammatory effects. The development of more potent and selective TRPM8
agonists may yield novel anti-inflammatory agents.
|Animals
[MESH]
|Anti-Infective Agents/pharmacology/therapeutic use
[MESH]
|Anti-Inflammatory Agents/*pharmacology/therapeutic use
[MESH]
|Cyclohexanols/*pharmacology/therapeutic use
[MESH]