Functional modification of the guanine nucleotide regulatory protein after desensitization of turkey erythrocytes by catecholamines
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Effects of dietary zinc source on the metabolic and immunological response to lipopolysaccharide in lactating Holstein dairy cows
2019, Journal of Dairy ScienceCitation Excerpt :Explanations for why AvZn-induced decreased cortisol did not affect PMN function are not clear; however, cortisol concentrations had almost returned to baseline values before PMN isolation, and it is not clear how long neutrophils need to be exposed to corticosteroids before becoming less functional. Additionally, leukocytes can develop steroid intolerance to immunosuppressive glucocorticoids (Briggs et al., 1983; Snavely et al., 1985). Even though the decrease in cortisol did not coincide with changes in neutrophil activity, it may suggest that the LPS insult was less severe with complexed Zn supplementation, and this agrees with the reduced febrile response.
Effects of continuous and increasing lipopolysaccharide infusion on basal and stimulated metabolism in lactating Holstein cows
2019, Journal of Dairy ScienceCitation Excerpt :However, the blunted response to adrenergic stimulation could also be due to desensitization of adrenergic receptors, as epinephrine is increased during both heat stress (Alvarez and Johnson, 1973) and an endotoxin challenge in humans, cattle, and sheep (Richardson et al., 1989; Williams et al., 2009; Burdick et al., 2011). Chronically increased circulating epinephrine can downregulate and desensitize adrenergic receptors (Briggs et al., 1983; Snavely et al., 1985), potentially inducing resistance to adrenergic signaling. Surprisingly, despite the LPS-induced hyperinsulinemia, no changes in adipose lipolysis or hepatic glucose output (glycogenolysis) in response to the EC were detected in the current study.
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