Abstract
The ontogeny and kinetics of carnitine palmitoyltransferase I (CPT I) were investigated in hepatopancreas and muscle throughout four developmental stages (newly hatched larvae, 1-month-old juvenile, 3-month-old, and 6-month-old, respectively) of grass carp Ctenopharyngodon idella. In hepatopancreas, the maximal velocity (V max) significantly increased from hatching to 1-month-old grass carp and then gradually declined at 6-month-old grass carp. In muscle, CPT I activity was the highest at 1-month-old grass carp, nearly twofold higher than that at hatching (P < 0.05). The Michaelis constant (K m) value was also the highest for 1-month-old in both tested tissues. Carnitine concentrations (FC, AC and TC) were the lowest for 3-month-old grass carp and remained relatively constant in both tissues from fish under the other developmental stages. The FC concentration in hepatopancreas and muscle at four developmental stages were less than the respective K m, indicating that grass carp required supplemental carnitine in their food to ensure that CPT I activity was not constrained by carnitine availability.
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Abbreviations
- AC:
-
Acyl carnitine
- TC:
-
Total carnitine
- FC:
-
Free carnitine
- ANOVA:
-
One-way analysis of variance
- CPT:
-
Carnitine palmitoyltransferase
- DTNB:
-
5, 5′-dithio-bis-(2-nitrobenzoic acid)
- K m :
-
Michaelis–Menten constants
- MS 222:
-
Tricaine methanesulfonate
- SEM:
-
Standard error of mean
- V max :
-
Maximal reaction velocity
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Acknowledgments
This work was funded by ‘973’ project, China (Grant No. 2009CB118706), and the Special Fund for Agro-Scientific Research in the Public Interest of China (Grant No. 201003020).
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Hu, W., Luo, Z., Mai, KS. et al. Ontogeny and kinetics of carnitine palmitoyltransferase I in hepatopancreas and skeletal muscle of grass carp (Ctenopharyngodon idella). Fish Physiol Biochem 41, 1393–1401 (2015). https://doi.org/10.1007/s10695-015-0094-1
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DOI: https://doi.org/10.1007/s10695-015-0094-1