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Tohoku University Technology: Novel Bone Formation Promoter: T08-041

New efficacy of nitrogen-free bisphosphonates expected for use in the field of oral surgery!

Bisphosphonates (BP) have bone resorption inhibitory effects by suppressing the function of osteoclasts and are used as medications for diseases such as osteoporosis. However, side effects such as bisphosphonate-related osteonecrosis of the jaw (BRONJ) have also been reported, posing challenges. There are very few reports of BRONJ associated with the use of non-nitrogen-containing BPs (Literature 1), but they have lower bone formation inhibitory effects compared to nitrogen-containing BPs. The present invention relates to a treatment for diseases such as osteoporosis based on the unexpected confirmation of a bone formation promoting effect of Disodium dihydrogen-4-[(methylthio) phenylthio] methanebisphosphonate (MPMBP), which is a type of non-nitrogen-containing BP.

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Tohoku University Technology: Cartilage Formation Promoter: T20-1259

Recovery of lost bones and cartilage.

As a treatment method, anti-inflammatory agents and artificial joint replacement surgery are being performed; however, there is a challenge that the lost cartilage tissue cannot be restored. This invention relates to the cartilage formation-promoting effect of a bisphosphonate (BP) formulation called MPMBP. As shown in the right figure, toluidine blue staining of the mandibular condyle in ovariectomized estrogen-deficient osteoporosis model rats (OVX rats) revealed that the thickness of the cartilage layer (chondrocyte layer + hypertrophic chondrocyte layer), which had decreased due to OVX, increased with MPMBP administration. The increased cartilage was rich in proteoglycans, restoring the proteoglycan levels in the cartilage layer that had decreased due to osteoporosis to normal amounts. Furthermore, it was also confirmed that the number of osteoclasts in the subchondral bone layer decreased (data not shown).

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