Diabetes mellitus (DM) is a kind of chronic metabolic disease that could be characterized by uncontrollable high blood glucose (hyperglycemia) over a prolonged period and diverse complications in various organs. These complications include activation of stress responses in bone such as oxidative stress and inflammation, which have been implicated in various bone diseases, including osteoporosis. Non-enzymatic glycation of proteins form and accumulate in patients under hyperglycemia condition. Methylglyoxal (MG) is a reactive advanced glycation end-product precursor.
Abnormal high concentration of MG was in serum of diabetic patients. It was proven that MG induces various stress responses. This indicates that it might possibly the key metabolite leading to diabetes-associated bone loss. In this data report, using cell models, the underlying mechanism of methylglyoxal on osteoclast that may lead to bone loss was investigated.
In cell cultures, RAW264.7, Macrophages, was treated with methylglyoxal and gene expressions of osteoclast bone biomarkers were investigated. Furthermore, the inhibitions of p38 and p44/42 activities were employed to investigate the osteoclast biomarkers CTSK, OSCAR, and TRACP5 gene expressions.
These data implied that MG activated the p38 and p44/42, which was reported to regulate proliferation and differentiation of osteoclast. However, the decreasing MAPK though siRNA knockdown did not change expression of those target markers, TRACP5, OSCAR, and CTSK, in mRNA level. The effects of MG to other osteoclast markers through p38 and p44/42 would be worth to be investigated.
For more insight please see Methylglyoxal Activates Osteoclasts through JNK Pathway leading to Osteoporosis.
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