Abstract
We investigated role of β-endorphin (END), which is released by immobilization stress, on intimal fibromuscular proliferation in a rat model of arterial remodeling after intimal injury. The endothelium of the abdominal aorta of Wistar-Kyoto rats was denuded, and the rats were subjected to immobilization stress (6 h/d), which raised the serum concentration of END, and intraperitoneal administration of either END (20 ng/kg/d) or naltrexone (NAL: 4 mg/kg/d). The proliferative activity (PA) of medial smooth muscle cells (SMCs) and the intima/media area ratio (R) were determined at 3 and 14 d after denudation, respectively. PA and R were significantly reduced by immobilization (PA: 64.8%, R: 34.6%), and NAL treatment completely reversed the decreases in PA and R. On the other hand, END reduced both PA and R (PA: 21.7% and R: 24.9%), and NAL also reversed the decreases in PA and R. END (20 pg/mL) inhibited both the proliferation (79% at 96 h) and migration (26%) of SMCs cultured with 5% fetal bovine serum in vitro, and NAL (100 μg/mL) reversed the inhibition of both activities. Our results suggest that immobilization stress stimulates the release of endogenous END, which then prevents both proliferation and migration of medial SMCs after intimal injury.
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Iwai, K., Takahashi, T., Nakahashi, T. et al. Immobilization Stress Inhibits Intimal Fibromuscular Proliferation in the Process of Arterial Remodeling in Rats. Hypertens Res 31, 977–986 (2008). https://doi.org/10.1291/hypres.31.977
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DOI: https://doi.org/10.1291/hypres.31.977
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