期刊
BONE
卷 40, 期 2, 页码 345-353出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.bone.2006.09.011
关键词
AGE; apoptosis; bone; cell death; diabetes; hyperglycemia
资金
- NIAMS NIH HHS [P01AR49920, P01 AR049920, R01 AR060055] Funding Source: Medline
- NIDCR NIH HHS [R01 DE007559, R01 DE014066, R01DE14066, R01 DE011254] Funding Source: Medline
We have previously shown that diabetes significantly enhances apoptosis of osteoblastic cells in vivo and that the enhanced apoptosis contributes to diabetes impaired new bone formation. A potential mechanism is enhanced apoptosis stimulated by advanced glycation end products (AGEs). To investigate this further, an advanced glycation product, carboxymethyl lysine modified collagen (CML-collagen), was injected in vivo and stimulated a 5-fold increase in calvarial periosteal cell apoptosis compared to unmodified collagen. It also induced apoptosis in primary cultures of human or neonatal rat osteoblastic cells or MC3T3-E1 cells in vitro. Moreover, the apoptotic effect was largely mediated through RAGE receptor. CML-collagen increased p38 and JNK activity 3.2- and 4.4-fold, respectively. Inhibition of p38 and JNK reduced CML-collagen stimulated apoptosis by 45% and 59% and by 90% when used together (P < 0.05). The predominant apoptotic pathway induced by CML-collagen involved caspase-8 activation of caspase-3 and was independent of NF-kappa B activation. When osteoblastic cells were exposed to a long-term low dose incubation with CML-collagen, there was a higher degree of apoptosis compared to short-term incubation. In more differentiated osteoblastic cultures, apoptosis was enhanced even further. These results indicate that advanced glycation end products, which accumulate in diabetic and aged individuals, may promote apoptosis of osteoblastic cells and contribute to deficient bone formation. (c) 2006 Elsevier Inc. All rights reserved.
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