Effects of sex and estrous cycle on the brain and plasma arginine metabolic profile in rats

l -arginine is a versatile amino acid with a number of bioactive metabolites. Increasing evidence implicates altered arginine metabolism in the aging and neurodegenerative processes. The present study, for the first time, determined the effects of sex and estrous cycle on the brain and blood (plasma...

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Veröffentlicht in:Amino acids 2021-09, Vol.53 (9), p.1441-1454
Hauptverfasser: Zhang, Jiaxian, Jing, Yu, Zhang, Hu, Liu, Ping
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container_title Amino acids
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creator Zhang, Jiaxian
Jing, Yu
Zhang, Hu
Liu, Ping
description l -arginine is a versatile amino acid with a number of bioactive metabolites. Increasing evidence implicates altered arginine metabolism in the aging and neurodegenerative processes. The present study, for the first time, determined the effects of sex and estrous cycle on the brain and blood (plasma) arginine metabolic profile in naïve rats. Female rats displayed significantly lower levels of l -arginine in the frontal cortex and three sub-regions of the hippocampus when compared to male rats. Moreover, female rats had significantly higher levels of l -arginine and γ -aminobutyric acid, but lower levels of l -ornithine, agmatine and putrescine, in plasma relative to male rats. The observed sex difference in brain l -arginine appeared to be independent of the enzymes involved in its metabolism, de novo synthesis and blood-to-brain transport (cationic acid transporter 1 protein expression at least), as well as circulating l -arginine. While the estrous cycle did not affect l -arginine and its metabolites in the brain, there were estrous cycle phase-dependent changes in plasma l -arginine. These findings demonstrate the sex difference in brain l -arginine in the estrous cycle-independent manner. Since peripheral blood has been increasingly used to identify biomarkers of brain pathology, the influences of sex and estrous cycle on blood arginine metabolic profile need attention when experimental research involves female rodents.
doi_str_mv 10.1007/s00726-021-03040-5
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Increasing evidence implicates altered arginine metabolism in the aging and neurodegenerative processes. The present study, for the first time, determined the effects of sex and estrous cycle on the brain and blood (plasma) arginine metabolic profile in naïve rats. Female rats displayed significantly lower levels of l -arginine in the frontal cortex and three sub-regions of the hippocampus when compared to male rats. Moreover, female rats had significantly higher levels of l -arginine and γ -aminobutyric acid, but lower levels of l -ornithine, agmatine and putrescine, in plasma relative to male rats. The observed sex difference in brain l -arginine appeared to be independent of the enzymes involved in its metabolism, de novo synthesis and blood-to-brain transport (cationic acid transporter 1 protein expression at least), as well as circulating l -arginine. While the estrous cycle did not affect l -arginine and its metabolites in the brain, there were estrous cycle phase-dependent changes in plasma l -arginine. These findings demonstrate the sex difference in brain l -arginine in the estrous cycle-independent manner. Since peripheral blood has been increasingly used to identify biomarkers of brain pathology, the influences of sex and estrous cycle on blood arginine metabolic profile need attention when experimental research involves female rodents.</description><identifier>ISSN: 0939-4451</identifier><identifier>EISSN: 1438-2199</identifier><identifier>DOI: 10.1007/s00726-021-03040-5</identifier><identifier>PMID: 34245369</identifier><language>eng</language><publisher>Vienna: Springer Vienna</publisher><subject>Aging ; Agmatine ; Amino acids ; Analytical Chemistry ; Animals ; Arginine ; Arginine - blood ; Arginine - metabolism ; Bioactive compounds ; Biochemical Engineering ; Biochemistry ; Biological Transport ; Biomarkers ; Biomedical and Life Sciences ; Blood ; Brain ; Brain - metabolism ; Cationic Amino Acid Transporter 1 - metabolism ; Cortex (frontal) ; Estrous Cycle ; Estrus cycle ; Experimental research ; Female ; Life Sciences ; Male ; Males ; Metabolism ; Metabolites ; Metabolome ; Neurobiology ; Original Article ; Ornithine ; Peripheral blood ; Plasma ; Protein transport ; Proteomics ; Putrescine ; Rats ; Rats, Sprague-Dawley ; Rodents ; Sex ; Sex differences ; Sex Factors ; γ-Aminobutyric acid</subject><ispartof>Amino acids, 2021-09, Vol.53 (9), p.1441-1454</ispartof><rights>The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature 2021</rights><rights>2021. 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Increasing evidence implicates altered arginine metabolism in the aging and neurodegenerative processes. The present study, for the first time, determined the effects of sex and estrous cycle on the brain and blood (plasma) arginine metabolic profile in naïve rats. Female rats displayed significantly lower levels of l -arginine in the frontal cortex and three sub-regions of the hippocampus when compared to male rats. Moreover, female rats had significantly higher levels of l -arginine and γ -aminobutyric acid, but lower levels of l -ornithine, agmatine and putrescine, in plasma relative to male rats. The observed sex difference in brain l -arginine appeared to be independent of the enzymes involved in its metabolism, de novo synthesis and blood-to-brain transport (cationic acid transporter 1 protein expression at least), as well as circulating l -arginine. While the estrous cycle did not affect l -arginine and its metabolites in the brain, there were estrous cycle phase-dependent changes in plasma l -arginine. These findings demonstrate the sex difference in brain l -arginine in the estrous cycle-independent manner. Since peripheral blood has been increasingly used to identify biomarkers of brain pathology, the influences of sex and estrous cycle on blood arginine metabolic profile need attention when experimental research involves female rodents.</abstract><cop>Vienna</cop><pub>Springer Vienna</pub><pmid>34245369</pmid><doi>10.1007/s00726-021-03040-5</doi><tpages>14</tpages><orcidid>https://orcid.org/0000-0002-4855-1456</orcidid></addata></record>
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subjects Aging
Agmatine
Amino acids
Analytical Chemistry
Animals
Arginine
Arginine - blood
Arginine - metabolism
Bioactive compounds
Biochemical Engineering
Biochemistry
Biological Transport
Biomarkers
Biomedical and Life Sciences
Blood
Brain
Brain - metabolism
Cationic Amino Acid Transporter 1 - metabolism
Cortex (frontal)
Estrous Cycle
Estrus cycle
Experimental research
Female
Life Sciences
Male
Males
Metabolism
Metabolites
Metabolome
Neurobiology
Original Article
Ornithine
Peripheral blood
Plasma
Protein transport
Proteomics
Putrescine
Rats
Rats, Sprague-Dawley
Rodents
Sex
Sex differences
Sex Factors
γ-Aminobutyric acid
title Effects of sex and estrous cycle on the brain and plasma arginine metabolic profile in rats
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