In this analysis, we observed that this immunoreactivity appeared to be primarily of neuronal origin for both protein carbonyls (Fig. implications for understanding how WD may potentially contribute to brain dysfunction and the development of neurodegenerative disorders such as Alzheimers disease. Keywords:adipokine, Alzheimers disease, amyloid-, protein oxidation, Western diet A high excess fat Western diet (WD) promotes a number of well-established metabolic disturbances and increased morbidity (Weisburger 1997;Litchtensteinet al. 1998;Shawet al. 2005). The best-documented effects of long-term WD consumption include an increased incidence of obesity, hyperinsulemia, hyperglycermia, hypertension, and cardiovascular disease. Consumption of a WD is linked to altered levels of circulating adipose derived peptides known as adipokines (Rontiet al. 2006), which are known to potentially promote a number of deleterious effects in different organ systems. Accompanying each of these systemic effects of a WD, studies have identified the ability of a WD to promote numerous potentially deleterious biochemical alterations in various tissues. In particular, studies have linked consumption of a WD Kobe0065 to increased levels of oxidative stress (Dinizet al. 2004;Ghoshet al. 2006;Milagroet al. 2006;Robertset al. 2006;Bulloet al. 2007), including increased levels of protein oxidation and lipid peroxidation. Kobe0065 While these effects of long-term ( 4 months) WD are well established, considerably less is currently known with regards to the initial effects of a WD. Identifying early biochemical events that occur following initial WD exposure may be particularly important in identifying the key substrates which are theory mediators of the deleterious effects of prolonged WD consumption. In contrast to tissues such as the muscle and the liver, relatively little is known with regards to the effects a WD on the brain, and even less with regards to the effects of short-term WD on the brain. Recent clinical studies however have suggested that a WD may contribute to the development of Alzheimers disease (AD) (Morriset al. 2003;Pasinettiet al. 2007). Additionally, studies using rodent models of AD pathology have exhibited that long-term administration of diets high in excess fat, cholesterol, or sucrose are sufficient to increase the levels of amyloid- (A) pathology (Rofoloet al. 2000;Oksmanet al. 2006;Caoet al. 2007;Hoojimaset al. 2007). Currently the effect of a WD on the initial phase of A pathogenesis is not clear. Similarly, it is unknown whether a WD modulates the levels of oxidative stress in experimental models relevant to AD. Clarifying experimentally the relationship between the potential effects of a WD on A pathology and oxidative stress in the brain is particularly important given the intense desire for understanding the apparent reciprocal relationship between A pathogenesis and the development of oxidative stress in AD (Markesbery 1997;Mattson 2004;Sunget al. 2004;Swerdlow 2007;Zanaet al. 2007;Zhuet al. 2007;Reddy and Beal 2008;Tamagnoet al. 2008). Previous studies have demonstrated that amyloid precursor protein and presenilin-1 knock-in mice (APP PS1) recapitulate several pathological features associated with AD, including age-related increases in A insolubility and deposition (Anantharamanet al. 2006;Murphyet al. 2007). Additionally, these mice exhibit many physiological alterations associated with AD (Simanet al. 2000;Changet al. 2006), and exhibit a time-dependent increase in the levels of oxidative stress (Anantharamanet al. 2006). In this study, we placed young (1-month old) APP PS1 mice, and their non-transgenic littermates, on a WD Mouse monoclonal to CD14.4AW4 reacts with CD14, a 53-55 kDa molecule. CD14 is a human high affinity cell-surface receptor for complexes of lipopolysaccharide (LPS-endotoxin) and serum LPS-binding protein (LPB). CD14 antigen has a strong presence on the surface of monocytes/macrophages, is weakly expressed on granulocytes, but not expressed by myeloid progenitor cells. CD14 functions as a receptor for endotoxin; when the monocytes become activated they release cytokines such as TNF, and up-regulate cell surface molecules including adhesion molecules.This clone is cross reactive with non-human primate for 1 month to determine if this relatively short-term WD altered the levels of oxidative stress or accelerated the development of A Kobe0065 pathology. Together, these studies demonstrate that a WD preferentially increases cerebral protein oxidation and lipid peroxidation.