Abstract
trans-10,cis-12 (t10c12) Conjugated linoleic acid (CLA) reduced body lipid deposition in various experimental animals, but the mechanisms involved were still emerging. Carnitine palmitoyltransferase I (CPT I) catalyzes an important regulatory step in lipid metabolism. At present, no studies, to our knowledge, have evaluated the kinetic constants influenced by dietary CLA in fish. In the present study, we tested the hypothesis that changes in body lipid content in fish as a response to dietary t10c12 CLA was related to the change of CPT I kinetic constants [Michaelis constant (K m), maximal velocity and catalytic efficiency for carnitine and palmitoyl-CoA]. Juvenile Synechogobius hasta were fed three experimental diets with fish oil replaced with 0 (control), 1, or 2 % t10c12 CLA for 8 weeks. Weight gain, specific growth rate and protein efficiency rate increased with dietary t10c12 CLA level. Dietary t10c12 CLA addition significantly reduced lipid contents both in liver and muscle. Dietary CLA addition also improved CPT I activities in muscle but did not significantly influence hepatic CPT I activity. CPT I kinetic parameters (K m, V max and catalytic efficiency) were significantly influenced by t10c12 CLA. CPT I catalytic efficiencies with carnitine and palmitoyl-CoA as substrates were higher in muscle and liver of fish fed increasing t10c12 CLA. For the first time, the findings demonstrated effect of dietary CLA addition on CPT I kinetics in fish and supported our starting hypothesis that dietary t10c12 CLA addition induced alterations in CPT I kinetic constants of muscle and liver. Increased CPT I catalytic efficiency might be the main reason for reduced lipid deposition in these tissues by dietary t10c12 CLA supplementation.
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Abbreviations
- BSA:
-
Bovine serum albumin
- CLA:
-
Conjugated linoleic acid
- CPT I:
-
Carnitine palmitoyltransferase I
- FA:
-
Fatty acid
- FBW:
-
Final body weight
- FCR:
-
Feed conversion rate
- FI:
-
Feed intake
- IBW:
-
Initial body weight
- MIB:
-
Mitochondrial isolation buffer
- PER:
-
Protein efficiency rate
- PUFA:
-
Polyunsaturated fatty acid
- SGR:
-
Specific growth rate
- SR:
-
Survival rate
- TAG:
-
Triacylglycerol
- WG:
-
Weight gain
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Acknowledgments
This work was funded by a program for New Century Excellent Talents in University, Ministry of Education, China (Grant No. NCET-08-0782), by the Special Fund for Central University, Ministry of Education, China (Grant No. 52204-10078), by the National Natural Science Foundation of China (Grant Nos. 30800850, 31072226). We wish to thank the staff of the Panjin Guanghe Fisheries Co., Ltd., for providing the experimental base and for their logistic support during this study.
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Tan, XY., Luo, Z., Zeng, Q. et al. trans-10,cis-12 Conjugated Linoleic Acid Improved Growth Performance, Reduced Lipid Deposition and Influenced CPT I Kinetic Constants of Juvenile Synechogobius hasta . Lipids 48, 505–512 (2013). https://doi.org/10.1007/s11745-013-3759-5
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DOI: https://doi.org/10.1007/s11745-013-3759-5