Characterisation of cholinesterase and histopathological features of brain of Clarias gariepinus following exposure to cadmium
J Environ Biol
;
2019 Mar; 40(2): 133-142
Article
| IMSEAR
| ID: sea-214572
ABSTRACT
Aim:
Cholinesterase (ChE) inhibition and histopathological features of brain tissues of Clarias gariepinus were investigated with a purpose to develop biomarkers for monitoring heavy metals.Methodology:
The effects of cadmium toxicity on C. gariepinus were assessed by ChE inhibition and characterisation of ChE by affinity chromatography and histological variations in brain tissues were studied by H&E staining under light microscope.Results:
The purified enzyme gave 10.58 fold purification with the recovery of 12% with specific activity of 159.729 U mg-1. The Michaelis-Menten constant (Km) and Vmax value obtained was 1.985 mM and 0.4479 µmol min-1 mg-1, respectively. The enzyme showed the ability to hydrolyse acetylthiocholine iodide (ATC) at a faster rate compared to other two synthetic substrates, propionylcholine iodide (PTC) and butyrylthiocholine iodide (BTC). ChE showed highest activity at 35°C in Tris-HCl pH 7.5. The metal inhibition study also found the maximal inhibitory concentration (IC50) value for cadmium to be 0.6517 mg l-1. Histological study revealed decrease in the number of cells, degeneration of Purkinje cells, increased aggregation area and cells necrosis.Interpretation:
Inhibition of cholinesterase activity and degeneration of Purkinje cells observed in the present study can be used as a tool for further developing a biomarker for detecting heavy metals in the aquatic ecosystems.
Texte intégral:
Disponible
Indice:
IMSEAR (Asie du Sud-Est)
Texte intégral:
J Environ Biol
Année:
2019
Type:
Article
Documents relatifs à ce sujet
MEDLINE
...
LILACS
LIS