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Effects of natural and synthetic isothiocyanate-based H2S-releasers against chemotherapy-induced neuropathic pain: Role of Kv7 potassium channels.

Abstract：

:Hydrogen sulfide (H2S) is a crucial signaling molecule involved in several physiological and pathological processes. Nonetheless, the role of this gasotransmitter in the pathogenesis and treatment of neuropathic pain is controversial. The aim of the present study was to investigate the pain relieving profile of a series of slow releasing H2S donors (the natural allyl-isothiocyanate and the synthetics phenyl- and carboxyphenyl-isothiocyanate) in animal models of neuropathic pain induced by paclitaxel or oxaliplatin, anticancer drugs characterized by a dose-limiting neurotoxicity. The potential contribution of Kv7 potassium channels modulation was also studied. Mice were treated with paclitaxel (2.0 mg kg-1) i.p. on days 1, 3, 5 and 7; oxaliplatin (2.4 mg kg-1) was administered i.p. on days 1-2, 5-9, 12-14. Behavioral tests were performed on day 15. In both models, single subcutaneous administrations of H2S donors (1.33, 4.43, 13.31 μmol kg-1) reduced the hypersensitivity to cold non-noxious stimuli (allodynia-related measurement). The prototypical H2S donor NaHS was also effective. Activity was maintained after i.c.v. administrations. On the contrary, the S-lacking molecule allyl-isocyanate did not increase pain threshold; the H2S-binding molecule hemoglobin abolished the pain-relieving effects of isothiocyanates and NaHS. The anti-neuropathic properties of H2S donors were reverted by the Kv7 potassium channel blocker XE991. Currents carried by Kv7.2 homomers and Kv7.2/Kv7.3 heteromers expressed in CHO cells were potentiated by H2S donors. Sistemically- or centrally-administered isothiocyanates reduced chemotherapy-induced neuropathic pain by releasing H2S. Activation of Kv7 channels largely mediate the anti-neuropathic effect.

journal_name

Neuropharmacology

journal_title

Neuropharmacology

authors

Di Cesare Mannelli L,Lucarini E,Micheli L,Mosca I,Ambrosino P,Soldovieri MV,Martelli A,Testai L,Taglialatela M,Calderone V,Ghelardini C

doi

10.1016/j.neuropharm.2017.04.029

subject

Has Abstract

pub_date

2017-07-15 00:00:00

pages

49-59

eissn

0028-3908

issn

1873-7064

pii

S0028-3908(17)30179-X

journal_volume

121

pub_type

杂志文章

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