Zhao D, Han DF, Wang SS, Lv B, Wang X, Ma C. Roles of tumor necrosis factor-α and interleukin-6 in regulating bone cancer pain via TRPA1 signal pathway and beneficial effects of inhibition of neuro-inflammation and TRPA1.
Mol Pain 2020;
15:1744806919857981. [PMID:
31144562 PMCID:
PMC6580714 DOI:
10.1177/1744806919857981]
[Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Background
Pain is one of the most common and distressing symptoms suffered by patients
with progression of bone cancer; however, the mechanisms responsible for
hyperalgesia are not well understood. The purpose of our current study was
to determine contributions of the sensory signaling pathways of inflammatory
tumor necrosis factor-α and interleukin-6 and downstream transient receptor
potential ankyrin 1 (TRPA1) to neuropathic pain induced by bone cancer. We
further determined whether influencing these pathways can improve bone
cancer pain.
Methods
Breast sarcocarcinoma Walker 256 cells were implanted into the tibia bone
cavity of rats to induce mechanical and thermal hyperalgesia. ELISA and
western blot analysis were used to examine (1) the levels of tumor necrosis
factor-α and interleukin-6 in dorsal root ganglion and (2) protein
expression of tumor necrosis factor-α and interleukin-6 receptors (TNFR1 and
IL-6R) and TRPA1 as well as intracellular signals (p38-MAPK and JNK).
Results
Tumor necrosis factor-α and interleukin-6 were elevated in the dorsal root
ganglion of bone cancer rats, and expression of TNFR1, IL-6R, and TRPA1 was
upregulated. In addition, inhibition of TNFR1 and IL-6R alleviated
mechanical and thermal hyperalgesia in bone cancer rats, accompanied with
downregulated TRPA1 and p38-MAPK and JNK.
Conclusions
We revealed specific signaling pathways leading to neuropathic pain during
the development of bone cancer, including tumor necrosis factor-α-TRPA1 and
interleukin-6-TRPA1 signal pathways. Overall, our data suggest that blocking
these signals is beneficial to alleviate bone cancer pain.
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