Yano Hiromi
   Department     ,
Article types 原著
Language English
Peer review Peer reviewed
Title Exercise training attenuates adipose tissue fibrosis in diet-induced obese mice.
Journal Formal name:Biochemical and Biophysical Research Communications
Abbreviation:Biochem Biophys Res Commun
Volume, Issue, Page 440(4),774-779頁
Author and coauthor Noriaki Kawanishi, Hiroyuki Niihara, Tsubasa Mizokami, Hiromi Yano, Katsuhiko Suzuki
Publication date 2013/10
Summary Tissue fibrosis, such as that which occurs in obesity, is associated with chronic inflammatory diseases. Although regular exercise reduces adipose tissue inflammation, the mechanisms regulating the effects of exercise on adipose tissue fibrosis are unclear. This study aimed to clarify whether exercise training attenuates adipose tissue fibrosis with consequent reduction of extracellular matrix including collagens. Male C57BL/6J (4-week old) mice were randomly assigned to four groups that received a normal diet (ND) plus sedentary (n = 8), an ND plus exercise training (n = 8), a high-fat diet (HFD) plus sedentary (n = 12), and an HFD plus exercise training (n = 12). Mice were fed the ND or HFD from 4 to 20 weeks of age. The exercise groups were trained on a motorized treadmill for 60 min/day, five times/week over the same period. Histological hepatic fibrosis detected by Sirius red and a-smooth muscle actin staining were attenuated in HFD exercise mice compared with HFD sedentary mice. mRNA levels of transforming growth factor-b and tissue inhibitors of metalloproteinase-1, major regulators of tissue fibrosis, were increased in HFD sedentary mice but were attenuated in HFD exercise mice. Similarly, adipose tissue from the HFD sedentary mice contained higher macrophages than adipose tissue from the ND mice, and this was also lowered by exercise training. These findings suggest that exercise training may be effective for attenuating adipose tissue inflammation in obesity.