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��-Actin was used as an internal control. The primer pairs used were as follows: CART, 5��-GCTCCCATTCGGTTGGATTAC-3�� (forward) and 5��-CGGTGGTAGATGCACCAGAGTT-3�� (reverse); and ��-actin, 5��-TGTACCCAGGCATTGCTGACA-3�� (forward) and 5��-ACTCCTGCTTGCTGATCCACAT-3�� (reverse). The PCR amplification was performed in a total reaction volume of 20?��L. The cycling conditions for real-time RT-PCR were initial denaturation at 94��C for 2?min, followed by 40 cycles of 94��C for 10?s, 60��C for 15?s and 72��C for 45?s, with a final extension at 72��C for 10?min. Expression of CART mRNA was normalized against that of ��-actin and expression levels were quatified selleck chemicals using a standard curve method. A static incubation system was used, as described previously.18 Briefly, a 1.7?mm slice including the ARC was taken from the basal hypothalamus with a vibrating microtome (Microfield Scientific, Dartmouth, Devon, UK) and blocked lateral to the circle of Willis. The hypothalamic explants were incubated at 37��C in individual chambers containing 1?mL artificial cerebrospinal fluid (aCSF; composition (in mmol/L): NaCl 126; Na2HPO4 0.09; NaHCO3 20; CaCl2 1.4; MgSO4 0.09; KCl 6; glucose 5) containing 0.18?mg/mL ascorbic acid and 100?��g/mL aprotinin and bubbled with 95% O2 and 5% CO2. Following a 2?h equilibration period, the hypothalamic explants were incubated in the presence of 600?��L aCSF for Small molecule library 45?min (basal period) before being challenged with CART (0.4, 4, 40?nmol/L for 45?min; test period; n?=?8�C9 per group). The viability of the tissue was confirmed by a final 45?min exposure to aCSF containing 56?mmol/L KCl. Isotonicity was maintained by substituting K+ for Na+. Explants not showing higher peptide release in the test compared with basal period were excluded from analysis (Ficain at ?20��C until determination of NPY, AGRP, ��-MSH and CRH immunoreactivity (IR) by radioimmunoassay (RIA). Assays to determine NPY, AGRP, ��-MSH and CRH IR were performed using established methods.19�C21 The assays were performed in a total volume of 350?��L phosphate buffer, pH?7.4, containing 0.1% bovine servum albumin (BSA; for ��-MSH), 0.5% BSA (for AGRP), 1% BSA (for NPY) or 0.3% BSA (for CRH) and samples were incubated for 3?days. None of the neuropeptides tested cross-reacted with any of the antibodies used in the RIAs (data not shown). The intra- and interassay coefficients of variation were 7.4?��?2.1% and 8.2?��?2.3%, respectively, for the NPY RIA, 8.9?��?2.7% and 8.1?��?3.1%, respectively, for the AGRP RIA, 5.6?��?1.7% and 8.6?��?0.7%, respectively, for the CRH RIA and 8.2?��?2.3% and 8.5?��?3.2%, respectively, for the ��-MSH RIA. All results are expressed as the mean?��?SEM.