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Tuvdendorj D, Børsheim E, Sharp CP, Zhang X, Barone CM, Chinkes DL, Wolfe RR. Amino Acid Availability Regulates the Effect of Hyperinsulinemia on Skin Protein Metabolism in Pigs. J Biol Chem 2015; 290:17776-17783. [PMID: 26032410 DOI: 10.1074/jbc.m114.636100] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2014] [Indexed: 01/29/2023] Open
Abstract
The effects of amino acid supply and insulin infusion on skin protein kinetics (fractional synthesis rate (FSR), fractional breakdown rate (FBR), and net balance (NB)) in pigs were investigated. Four-month-old pigs were divided into four groups as follows: control, insulin (INS), amino acid (AA), and INS + AA groups based on the nutritional and hormonal conditions. l-[ring-(13)C6]Phenylalanine was infused. FBR was estimated from the enrichment ratio of arterial phenylalanine to intracellular free phenylalanine. Plasma INS was increased (p < 0.05) in the INS and INS + AA groups. Plasma glucose was maintained by infusion of glucose in the groups receiving INS. The interventions did not change the NB of skin protein. However, the interventions affected the FSR and FBR differently. An infusion of INS significantly increased both FSR and FBR, although AA infusion did not. When an AA infusion was added to the infusion of insulin (INS + AA group), FSR and FBR were both lower when compared with the INS group. Our data demonstrate that in anesthetized pigs INS infusion did not exert an anabolic effect, but rather it increased AA cycling into and out of skin protein. Because co-infusion of AAs with INS ameliorated this effect, it is likely that the increased AA cycling during INS infusion was related to AA supply. Although protein kinetics were affected by both INS and AAs, none of the interventions affected the skin protein deposition. Thus, skin protein content is closely regulated under normal circumstances and is not subject to transient changes in AAs or hormonal concentrations.
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Affiliation(s)
- Demidmaa Tuvdendorj
- Departments of Internal Medicine, Shriners Hospitals for Children, Galveston, Texas 77555.
| | - Elisabet Børsheim
- Departments of Pediatrics, Center for Translational Research in Aging and Longevity, University of Arkansas for Medical Sciences, Little Rock, Arkansas 72205; Departments of Geriatrics, Center for Translational Research in Aging and Longevity, University of Arkansas for Medical Sciences, Little Rock, Arkansas 72205; Arkansas Children's Nutrition Center, Little Rock, Arkansas 72205; Arkansas Children's Hospital Research Institute, Little Rock, Arkansas 72205
| | - Carwyn P Sharp
- Departments of Surgery, University of Texas Medical Branch, Shriners Hospitals for Children, Galveston, Texas 77555; Departments of Metabolism Unit, Shriners Hospitals for Children, Galveston, Texas 77555
| | - Xiaojun Zhang
- Departments of Surgery, University of Texas Medical Branch, Shriners Hospitals for Children, Galveston, Texas 77555; Departments of Metabolism Unit, Shriners Hospitals for Children, Galveston, Texas 77555
| | - Carrie M Barone
- Departments of Surgery, University of Texas Medical Branch, Shriners Hospitals for Children, Galveston, Texas 77555; Departments of Metabolism Unit, Shriners Hospitals for Children, Galveston, Texas 77555
| | - David L Chinkes
- Departments of Surgery, University of Texas Medical Branch, Shriners Hospitals for Children, Galveston, Texas 77555; Departments of Metabolism Unit, Shriners Hospitals for Children, Galveston, Texas 77555
| | - Robert R Wolfe
- Departments of Geriatrics, Center for Translational Research in Aging and Longevity, University of Arkansas for Medical Sciences, Little Rock, Arkansas 72205
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Tuvdendorj D, Børsheim E, Sharp CP, Zhang X, Aarsland A, Herndorn DN, Chinkes DL, Wolfe RR. Short‐term insulin infusion alone has negative effect on skin protein mass in fasted pigs. FASEB J 2009. [DOI: 10.1096/fasebj.23.1_supplement.991.22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | - Carwyn P Sharp
- SurgeryThe University of Texas Medical BranchGalvestonTX
- Wyle Integrated Science and EngineeringHoustonTX
| | - Xiaojun Zhang
- SurgeryThe University of Texas Medical BranchGalvestonTX
| | - Asle Aarsland
- SurgeryThe University of Texas Medical BranchGalvestonTX
| | | | | | - Robert R Wolfe
- GeriatricsUniversity of Arkansas Medical SciencesLittle RockAR
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