ID | 12018 |
Eprint ID | 12018
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FullText URL | |
Title Alternative | 筋収縮はラット咬筋内でのIL-6の遺伝子発現を亢進する
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Author |
Ono, Tsuyoshi
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Abstract | OBJECTIVE: This study was conducted to determine if interleukin-6 (IL-6) and interleukin-1beta (IL-1beta) mRNA expression increase in response to muscle contraction caused by repetitive electrical stimulation of the rat masseter muscle. METHODS: Male Wistar rats weighing 140-160 g were divided randomly into the following three groups: electrical stimulation (ES) group (n=21), carrageenan injection (CI) group (n=24), and ES under dantrolene sodium (muscle relaxant) injection (ESDI) group (n=7). ES or CI was done to the left masseter; and mock ES or mock CI to the right. Muscle tissues on both sides were sampled for total RNA isolation. Real-time RT-PCR was performed, with the cyclophilin A (CypA) mRNA level in each sample as an internal control. Mean relative IL-6 (il-6/cypA) and IL-1beta (il-1beta/cypA) mRNA levels were compared between the experimental and mock-treated sides within each group. RESULTS: Mean IL-6/CypA levels in the ES- or CI-treated muscle significantly increased, without any significant incremental change observed in either mock-treated muscle. Interestingly, the increase in the il-6/cypA level caused by the ES was suppressed by the injection of dantrolene sodium in the ESDI group. Furthermore, the mean il-1beta/cypA level in the CI-treated masseter also significantly increased without any significant incremental change observed in the mock-treated muscle. However, there was no significant difference in the mean il-1beta/cypA levels in the masseter between the ES- and the mock-treated sides. CONCLUSIONS: These results show that IL-6 mRNA expression in the rat masseter muscle was accelerated by the CI or by repetitive muscle contraction induced by ES. Since the mRNA level of IL-1beta, a well-known proinflammatory cytokine, was not altered by the contraction, the accelerated IL-6 mRNA expression elicited by the muscle contraction does not seem to be related to local inflammation.
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Keywords | masseter muscle
interleukin-6 (IL-6)
muscle contraction
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Note | http://dx.doi.org/10.1016/j.archoralbio.2006.10.025
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Published Date | 2006-03-24
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Publication Title | |
Content Type |
Thesis or Dissertation
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Grant Number | 甲第3354号
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Granted Date | 2006-03-24
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Thesis Type |
Doctor of Philosophy in Dental Science
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Grantor | 岡山大学
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Official Url | http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=17234151&dopt=Abstract
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language |
Japanese
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File Version | none
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Refereed |
Unknown
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