Journal
IMMUNOPHARMACOLOGY AND IMMUNOTOXICOLOGY
Volume 31, Issue 3, Pages 428-431Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/08923970902751651
Keywords
Bone fracture; osteoblasts; acidic pH; cathepsin B; IL-6
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Funding
- Korea Research Foundation [2005-015-E00210, 2007-314-C00234]
- National Research Foundation of Korea [2007-314-C00234, 2005-015-E00210] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Hypoxia, inflammation, and acidity occur after bone fracture. To simplify the fracture model, we tested the effects of acidity in osteoblasts. We tested three osteoblast cell lines, MG63, MC3T3E1, and HOS cells, with MG63 cells showing much higher sensitivity to acidic pH. In physiologically acidic surroundings, pH 7.2, the endoplasmic reticulum stress response was measured through the expression of unfolded protein response proteins. Acidic surroundings time-dependently increased IL-6 secretion. Cathepsin 13, a marker of the inflammation and angiogenic processes that occur after bone fracture, also increased. Thus, acidity can cause ER stress, increase IL-6, and increases cathepsin B expression in osteoblasts.
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