2021-03-16 22:29:50
BONE HEALTH
Bone health is a dynamic process of continual remodeling controlled by multiple factors. Sclerostin, a glycoprotein coded by the gene SOST, is produced by bone cells and suppresses bone formation. Now, researchers at Tokyo Medical and Dental University (TMDU) have shown that laser irradiation, by inhibiting sclerostin expression without inducing inflammation, shows promise as a new treatment modality for osteoporosis.
The benefits of low-level laser therapy are now gaining increased attention in spheres of medicine and dentistry that require enhanced bone regeneration.
The team knew that in periodontal surgery, bone that underwent controlled destruction using a specific type of laser known as an Er:YAG laser healed faster than bone subjected to conventional bur drilling. Thus, they wondered whether Er:YAG laser irradiation modified SOST expression in bone. “We set out to compare comprehensive and sequential gene expression and biological healing responses in laser-ablated, burdrilled, and untreated bone, as well as investigating the bio-stimulation effect of an Er:YAG laser on osteogenic cells,” explains Yujin Ohsugi, lead author.
Using microarray analysis, the researchers first studied gene expression patterns in rat skull bones during healing at 6, 24, and 72 hours after drilling or laser treatment. Immunohistochemical analysis at 1 day was performed to detect sclerostin expression. Additionally, oseteogenic cell cultures were irradiated in vitro and assessed for cell death and sclerostin concentration.
The finding that mechanical stimulation of laser irradiation inhibits the pathways that suppress bone regeneration without provoking inflammation may aid development of laser-based therapeutic methods. Such methods might be used in treatments for osteoporosis and to induce or promote bone regeneration in medical and dental procedures.
Journal Reference: Yujin Ohsugi, Sayaka Katagiri, Tomomitsu Hirota, Hiromi Niimi, Masahiro Hatasa, Kazuki Watanabe, Tsuyoshi Shimohira, Koji Mizutani, Moe Kitazawa, Ayumi Matsuzawa, Hiroshi Kadokura, Satoshi Yokose, Takanori Iwata, Akira Aoki. Laser irradiation decreases sclerostin expression in bone and osteogenic cells. The FASEB Journal, 2020; 34 (9): 12877 DOI: 10 .1096/ fj.202001032R
Materials provided by Tokyo Medical and Dental University. Content may be edited for length.
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