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Food consumption (g/100g bodyweight) during the night-time was significantly different among the three age groups (old? http://www.selleckchem.com/products/BEZ235.html manner after 1, 2, and 4?h in young rats, although the effect of 0.25?nmol orexin-A was not significant. Similarly, adult rats were stimulated dose-dependently, and only the effect of 3?nmol of orexin-A after 4?h was significant. The effect of orexin-A on food intake continued until 4?h in both adult and young rats. In contrast, no significant increase was observed in old rats, even when higher doses (1 and 3?nmol) were applied (Fig.?6a). The http://www.selleck.cn/products/gsk-j4-hcl.html integrated food intake during the 4-hr period is shown in Figure?6b. Intracerebroventricular injection of orexin-B slightly increased food intake in both young and old rats, but this effect was not significant. Western blot analysis using the anti-OX1R antibody detected specific bands corresponding to 54?kDa (Fig.?7a). The intensity of the band in the hypothalamus of the old rats was significantly lower than that of young rats. Western blot analysis using the anti-OX2R antibody (OX2R11-A) detected three bands in the hypothalamus of both young and old rats; at 79, 53, and 43?kDa. Because the OX2R pure protein was 52.5?kDa,14 we compared the intensity of the 53-kDa immuno-signal between young and old rats (Fig.?7b). The intensity of the 53-kDa bands were higher with old rats relative to young ones, but the difference was not significant. After the first discovery of NPY in 1982,15 orexin and ghrelin as appetite-stimulating peptides were discovered in 1998 and http://www.selleckchem.com/products/byl719.html 1999, respectively.10,16 Neuropeptide Y, a 36-amino acid peptide, is widely distributed throughout the rat brain and found in the highest concentrations in the hypothalamus.17 Neuropeptide Y, which has a strong appetite stimulating effect, is abundant within the hypothalamic arcuate nucleus (ARC), with projections to the paraventricular nucleus, the medial preoptic area, the lateral hypothalamus and the median eminence.17 Six NPY receptor subtypes have been described and they are widely distributed within the brain.18 The effects on feeding are mediated through at least two receptors, the Y1 and Y5 receptors.19,20 Neuropeptide Y neurons co-express agouti gene related peptide (AgRP), an endogenous melanocortin antagonist. We compared food intake among young, adult and old male rats as an indication of the stimulatory effect of intracerebroventricular administration of NPY.13 Young (4?months; 260�C335?g bodyweight), adult (11?months; 335�C465?g bodyweight) and old (24�C27?months; 360�C440?g bodyweight) Wistar rats were used. We carried out the same operation as in the study of orexin. Different doses of NPY (0, 0.03, 0.3 or 1.