2011. and Met postprandial concentrations at P0 were lower at 24 C than at 30 C ( 0.05). At both 24 and 30 C conditions, pigs had greater postprandial concentrations of insulin ( 0.01) and lower concentrations of NEFA ( 0.01) and -amino nitrogen ( 0.05) at P1 and P2 than at P0. Compared with P0, postprandial concentrations of glucose were greater ( 0.05) at P1 in pigs kept at 24 C, and at P1 and P2 in pigs kept at 30 C. At both ambient temperatures, pigs had lower ( 0.05) postprandial concentrations of Ala, Gly, His, Ile, Leu, Pro, Ser, Thr, Trp, and Val at P1 and P2 than at P0. Arginine postprandial concentration at P1 was lower than at P0 in pigs kept at 24 C ( 0.05), whereas no difference was observed in pigs at 30 C. Relative to P0, Gln and Tyr concentrations were lower at P1 and P2 in pigs kept at 24 C ( 0.01), whereas lower Gln concentration was observed only at P2 ( 0.01) and lower Tyr only at P1 ( 0.01) in pigs kept at 30 C. Our study shows a hyperglycemic and hyperinsulinemic state in LPS-challenged pigs and a greater magnitude of this response in pigs kept at 30 C. Furthermore, LPS caused important changes in BCAA, His, Thr, and Trp profiles, suggesting the role these AA in supporting the inflammatory response. Finally, our results suggest that LPS-induced effects on postprandial profiles of specific AA (Arg, Gln, Phe, and Tyr) may be modulated PCI-33380 by ambient temperature. 0.05. RESULTS The model of repeated injections of increasing amounts of LPS used in the study successfully induced a chronic inflammatory state, which was evidenced by loss of appetite, increased rectal temperature (RT), and haptoglobin circulating levels (Hp) during the LPS challenge (Campos et al., 2014b). For instance, Rabbit Polyclonal to Cyclosome 1 before the LPS challenge, ADFI, ADG, RT, and Hp of the subset of pigs used in the current study was 1,744 g/d, 849 g/d, 39.0 C, and 1.41 mg/mL in TN pigs; and 1,556 g/d, PCI-33380 647 g/d, 40.0 C, and 0.99 mg/mL in HT pigs. During the LPS challenge, the respective values were 1,195 g/d, 310 g/d, 40.0 C, and 2.52 mg/mL in TN pigs; and 1,282 g/d, 648 g/d, 40.7 C, and 2.04 mg/mL in HT pigs. On P0, P1, and P2 days, all pigs consumed their 300-g meal within less than 10 min and the jugular catheters worked properly during the entire experimental period. Effects of Ambient Temperature and LPS on Average Postprandial Concentrations of Insulin and Metabolites Plasma postprandial concentrations of PCI-33380 insulin and metabolites are presented in Table 2. Before the LPS challenge, HT PCI-33380 pigs had lower ( 0.01) glucose and lactate, and greater ( 0.01) -amino nitrogen average postprandial concentrations than TN pigs. At P0, ambient temperature did not affect insulin, NEFA, and urea postprandial concentrations. Table 2. Plasma insulin and metabolites average postprandial concentrations in pigs kept at 24 and 30 C before (P0) and during short- (P1) and medium-term (P2) phases of LPS challenge (least square means of 14 pigs per ambient temperature)1 lipopolysaccharide performed at 48-h intervals each. P0 corresponds to the time point before the LPS challenge, and P1 and P2 corresponded to the days after the second and fourth LPS injection, respectively. Average plasma postprandial concentrations measured 0, 10, 20, 30, 40, 50, 60, 75, 90, 105, 120, PCI-33380 150, 180, 210, and 240 min relative to a 300-g meal delivery at time 0 (see Figure 1 for postprandial profiles). Within each ambient temperature, linear contrasts were generated to compare P1 and P2 values to P0, using the contrast statement of the MIXED procedure. Within 24 C, * 0.05, ** 0.01. Within 30 C, ? 0.05, ?? 0.01. 2Residual SD. 3Within P0, data were analyzed using a general linear model including the fixed effects of ambient temperature (Ta), time sampling (0 to 240 min after the meal delivery), and their interaction as fixed effects. 4Within LPS challenge, data were analyzed using a linear mixed model including the effect of ambient temperature (Ta), phase of the LPS challenge (P), time sampling (0 to 240 after the meal delivery), and their interaction as fixed effects. The phase of the LPS challenge was specified as a repeated effect. Open in a separate window Figure 1. Postprandial profiles of insulin and metabolites before (P0) and during short- (P1) and medium-term (P2) phases of LPS challenge in pigs.