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Effects of Exogenous Glucocorticoid Infusion on Appetitic Center Development in Postnatal Dairy Bull Calves

SIMPLE SUMMARY: The profitability of production systems for livestock is directly impacted by body weight, which is influenced by an individual animal’s hypothalamic regulation of food intake. The objective of this study was to determine the effects of exogenous cortisol administration on circulatin...

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Autores principales: McCarty, Keelee J., Pratt, Scott L., Long, Nathan M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10295244/
https://www.ncbi.nlm.nih.gov/pubmed/37370490
http://dx.doi.org/10.3390/ani13121980
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author McCarty, Keelee J.
Pratt, Scott L.
Long, Nathan M.
author_facet McCarty, Keelee J.
Pratt, Scott L.
Long, Nathan M.
author_sort McCarty, Keelee J.
collection PubMed
description SIMPLE SUMMARY: The profitability of production systems for livestock is directly impacted by body weight, which is influenced by an individual animal’s hypothalamic regulation of food intake. The objective of this study was to determine the effects of exogenous cortisol administration on circulating leptin concentrations, protein expression in various fat depots, and the hypothalamic expression of genes associated with appetite regulation in Holstein bull calves. Within 4 h of parturition, Holstein bull calves (9/treatment) were intravenously infused with either a low (3.5 µg/kg of body weight (BW)) or high (7.0 µg/kg of BW) dose of cortisol or a sham infusion control (with a similar volume of saline). At five days of age, blood, cerebrospinal fluid from the third ventricle of the brain, and adipose (omental, perirenal, and mesenteric) and hypothalamic tissue were collected for the analysis of proteins and genes associated with appetite regulation. Exogenous cortisol administered to perinatal dairy bull calves reduced leptin concentrations in serum and cerebrospinal fluid, decreased the protein expression of leptin in perirenal and omental adipose tissue, and altered gene expression in hypothalamic tissue. Further investigation is necessary to determine if glucocorticoid administration can be utilized as a tool to improve feed intake in cattle later on in life due to hypothalamic programming at birth. ABSTRACT: The objective of this study was to determine the effects of exogenous glucocorticoid administration on leptin concentrations and brain development markers, such as protein and hypothalamic gene expression, in dairy bull calves. Within 4 h of parturition, Holstein bulls were intravenously infused with either a low cortisol dose (LC; n = 9, 3.5 µg/kg of body weight (BW)), high cortisol dose (HC; n = 9, 7.0 µg/kg BW), or control (CON; n = 9, saline) dose, with a 2nd infusion 24 h postpartum. Jugular blood was collected prior to infusion and daily until the calves were euthanized (day 5). Cerebrospinal fluid (CSF) from the third ventricle and adipose (omental, perirenal, and mesenteric) and hypothalamic tissue were collected. The blood and CSF samples were analyzed for leptin concentrations. The data were analyzed using SAS. Serum (p = 0.013) and CSF (p = 0.005) leptin concentrations in HC- and LC-treated calves were decreased compared with CON-treated calves. Leptin protein expression was decreased (p < 0.044) in perirenal and omental adipose tissue of LC-treated calves compared with CON-treated calves. Gene abundance of brain-derived neurotrophic factor and fibroblast growth factors 1 and 2 were decreased (p < 0.006) in HC- and LC-treated calves compared with CON-treated calves. In summary, cortisol administered to dairy bull calves reduced leptin concentrations, decreased leptin protein expression in perirenal and omental adipose tissue, and altered gene expression in hypothalamic tissue.
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spelling pubmed-102952442023-06-28 Effects of Exogenous Glucocorticoid Infusion on Appetitic Center Development in Postnatal Dairy Bull Calves McCarty, Keelee J. Pratt, Scott L. Long, Nathan M. Animals (Basel) Article SIMPLE SUMMARY: The profitability of production systems for livestock is directly impacted by body weight, which is influenced by an individual animal’s hypothalamic regulation of food intake. The objective of this study was to determine the effects of exogenous cortisol administration on circulating leptin concentrations, protein expression in various fat depots, and the hypothalamic expression of genes associated with appetite regulation in Holstein bull calves. Within 4 h of parturition, Holstein bull calves (9/treatment) were intravenously infused with either a low (3.5 µg/kg of body weight (BW)) or high (7.0 µg/kg of BW) dose of cortisol or a sham infusion control (with a similar volume of saline). At five days of age, blood, cerebrospinal fluid from the third ventricle of the brain, and adipose (omental, perirenal, and mesenteric) and hypothalamic tissue were collected for the analysis of proteins and genes associated with appetite regulation. Exogenous cortisol administered to perinatal dairy bull calves reduced leptin concentrations in serum and cerebrospinal fluid, decreased the protein expression of leptin in perirenal and omental adipose tissue, and altered gene expression in hypothalamic tissue. Further investigation is necessary to determine if glucocorticoid administration can be utilized as a tool to improve feed intake in cattle later on in life due to hypothalamic programming at birth. ABSTRACT: The objective of this study was to determine the effects of exogenous glucocorticoid administration on leptin concentrations and brain development markers, such as protein and hypothalamic gene expression, in dairy bull calves. Within 4 h of parturition, Holstein bulls were intravenously infused with either a low cortisol dose (LC; n = 9, 3.5 µg/kg of body weight (BW)), high cortisol dose (HC; n = 9, 7.0 µg/kg BW), or control (CON; n = 9, saline) dose, with a 2nd infusion 24 h postpartum. Jugular blood was collected prior to infusion and daily until the calves were euthanized (day 5). Cerebrospinal fluid (CSF) from the third ventricle and adipose (omental, perirenal, and mesenteric) and hypothalamic tissue were collected. The blood and CSF samples were analyzed for leptin concentrations. The data were analyzed using SAS. Serum (p = 0.013) and CSF (p = 0.005) leptin concentrations in HC- and LC-treated calves were decreased compared with CON-treated calves. Leptin protein expression was decreased (p < 0.044) in perirenal and omental adipose tissue of LC-treated calves compared with CON-treated calves. Gene abundance of brain-derived neurotrophic factor and fibroblast growth factors 1 and 2 were decreased (p < 0.006) in HC- and LC-treated calves compared with CON-treated calves. In summary, cortisol administered to dairy bull calves reduced leptin concentrations, decreased leptin protein expression in perirenal and omental adipose tissue, and altered gene expression in hypothalamic tissue. MDPI 2023-06-14 /pmc/articles/PMC10295244/ /pubmed/37370490 http://dx.doi.org/10.3390/ani13121980 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
McCarty, Keelee J.
Pratt, Scott L.
Long, Nathan M.
Effects of Exogenous Glucocorticoid Infusion on Appetitic Center Development in Postnatal Dairy Bull Calves
title Effects of Exogenous Glucocorticoid Infusion on Appetitic Center Development in Postnatal Dairy Bull Calves
title_full Effects of Exogenous Glucocorticoid Infusion on Appetitic Center Development in Postnatal Dairy Bull Calves
title_fullStr Effects of Exogenous Glucocorticoid Infusion on Appetitic Center Development in Postnatal Dairy Bull Calves
title_full_unstemmed Effects of Exogenous Glucocorticoid Infusion on Appetitic Center Development in Postnatal Dairy Bull Calves
title_short Effects of Exogenous Glucocorticoid Infusion on Appetitic Center Development in Postnatal Dairy Bull Calves
title_sort effects of exogenous glucocorticoid infusion on appetitic center development in postnatal dairy bull calves
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10295244/
https://www.ncbi.nlm.nih.gov/pubmed/37370490
http://dx.doi.org/10.3390/ani13121980
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