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. 2020 Dec;46(6):1965-1973.
doi: 10.1007/s10695-020-00847-z. Epub 2020 Jul 15.

Effects of two kinds of fishery drugs on the expressions of GAD and GABA-T mRNA in crucian carp (Carassius auratus gibelio)

Fan Zhang  1 , Kun Hu  2 , Jianzhen Huang  1 , Zhi Tan  1 , Jiming Ruan  3
Affiliations

Effects of two kinds of fishery drugs on the expressions of GAD and GABA-T mRNA in crucian carp (Carassius auratus gibelio)

Fan Zhang et al. Fish Physiol Biochem. 2020 Dec.

Abstract

The objective of this study was to investigate the effects of difloxacin (DIF) and avermectin (AVM) on glutamate decarboxylase (GAD) and GABA-transaminase (GABA-T) in different tissues of crucian carp (Carassius auratus gibelio). After the treatments of DIF and AVM, the mRNA expressions of GAD and GABA-T in different tissues were detected by quantitative real-time PCR (qPCR). The results showed that the mRNA expressions of GAD65, GAD67, and GABA-T in the telencephalon (Tel), mesencephalon (Mes), cerebella (Cer), and medulla oblongata (Med) were downregulated significantly with the safe dose (SD, 20 mg/kg) of DIF (P < 0.05 or P < 0.01). While the expressions of GAD65 and GAD67 in the kidney at 12 h had strikingly upregulated to 13.81 ± 1.06** and 150.67 ± 12.85** times. Treated with the lethal dose of 50% (LD50, 2840 mg/kg b. W.) of DIF, the mRNA expressions of GAD65, GAD67, and GABA-T in all tissues were increased significantly (P < 0.01). The results of AVM group showed that the mRNA expressions of GAD65, GAD67, and GABA-T both in the central and peripheral tissues were all remarkably downregulated at the safe concentration (SC, 0.0039 mg/L) and the lethal concentration of 50% (LC50, 0.039 mg/L), except for the mRNA inhibitions of GAD65, GAD67, and GABA-T in the muscle at 2 h which sharply downregulated to 0.20 ± 0.02ΔΔ × 10-2, 0.57 ± 0.06ΔΔ × 10-1 and 0.44 ± 0.02ΔΔ × 10-1, respectively (P < 0.01).

Keywords: Avermectin; Difloxacin; GABA-transaminase; Gamma-aminobutyric acid; Glutamate decarboxylase.

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Figures

Fig. 1
Fig. 1
Effects in brain GAD and GABA-T mRNA expressions at the SD of DIF
Fig. 2
Fig. 2
Effects of GAD and GABA-T mRNA expressions in the liver at the SD of DIF
Fig. 3
Fig. 3
Effects of GAD and GABA-T mRNA expressions in the kidney at the SD of DIF
Fig. 4
Fig. 4
Effects of GAD and GABA-T mRNA expressions in the muscle at the SD of DIF
Fig. 5
Fig. 5
Effects of GAD and GABA-T mRNA expressions in the brain at the SC of AVM
Fig. 6
Fig. 6
Effects of GAD and GABA-T mRNA expressions in the liver at the SC of AVM
Fig. 7
Fig. 7
Effects of GAD and GABA-T mRNA expressions in the kidney at the SC of AVM
Fig. 8
Fig. 8
Effects of GAD and GABA-T mRNA expressions in the muscle at the SC of AVM
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