The literature reports induction of obesity by a high fat diet in C57BL/6 mice (Johnston et al., 2007), but pilot studies have demonstrated that the animals’ acceptance of the diet reduced significantly after
the second week. A similar behavior was also observed in BALB/c mice. In this line, some mouse strains are responsive to dietary obesity when fed a diet containing moderate levels of fat, while other strains are not responsive and do not become obese when fed the same diet (West et al., 1992). Furthermore, lung parenchyma remodeled differently and presented distinct tissue mechanics depending on mouse strain (Antunes et al., 2009). In the current study, A/J mice were used, and after 12 weeks the total body mass was substantially this website greater (50%) in animals receiving the high fat diet than in those receiving the standard diet. Similar to genetically obese mice, the increase in the total body mass of A/J mice with a high fat diet is almost entirely due to an increase in fat mass (Black et al., 1998). The present asthma protocol was able to reproduce some aspects of chronic human asthma, such as airway hyperresponsiveness, RG7420 manufacturer BALF eosinophilia, smooth muscle hypertrophy, basement membrane thickness, and mucous gland hyperplasia (Xisto et al., 2005). Obesity yielded larger chest
wall circumferences, which resulted in lower tidal volume, alveolar
collapse, and a reduction in the diameter of airways. However, in the presence of obesity, asthma is not simply a mechanical phenomenon. In this line, Shore and colleagues have shown that obese mice have increased airway hyperresponsiveness independent of lung volume (Shore, 2007), possibly associated with augmentation of the inflammatory process (Ding et al., 1987 and Fredberg et al., 1999). In the present study, obesity led to an increase in the inflammatory process observed in Bay 11-7085 BALF and lung histology, especially after the induction of asthma. However, we cannot rule out a role of the remodeling process in increasing airway hyperresponsiveness. The greater extracellular matrix remodeling in obese mice with asthma was characterized by increased collagen deposition, α-smooth muscle actin content, and ultrastructural degeneration of airways (epithelial detachment, subepithelial fibrosis, elastic fiber fragmentation, smooth muscle hypertrophy, myofibroblast hyperplasia, and mucous cell hyperplasia). The impact of obesity on the remodeling process may result from chronic repetitive injury to the airway wall caused by inflammation even though inflammation is not necessarily related to remodeling in a quantitative manner (Locke et al., 2007, Abreu et al., 2010 and Antunes et al., 2010).
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