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Alterations in the expression of intestinal enzymes in rats exposed to nickel
Author(s) -
Singla Amika,
Kaur Jaspreet,
Mahmood Akhtar
Publication year - 2006
Publication title -
journal of applied toxicology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.784
H-Index - 87
eISSN - 1099-1263
pISSN - 0260-437X
DOI - 10.1002/jat.1148
Subject(s) - sucrase , brush border , maltase , lactase , alkaline phosphatase , disaccharidase , enzyme , medicine , endocrinology , crypt , aminopeptidase , small intestine , western blot , chemistry , biology , biochemistry , leucine , amino acid , vesicle , membrane , gene
The effect of feeding nickel (50 mg kg −1 body weight) daily for 7 days was studied on the development of various brush border enzymes across the crypt–villus axis. The activities of brush border maltase ( P < 0.05), lactase ( P < 0.05), alkaline phosphatase ( P < 0.05) and leucine amino peptidase ( P < 0.05) were augmented in purified brush borders, whereas sucrase, trehlase ( P < 0.01) and glutamyl transpeptidase ( P < 0.05) were reduced in nickel fed animals compared with controls. Kinetic and heat inactivation studies with brush border sucrase and alkaline phosphatase confirmed these findings. Western blot analysis of alkaline phosphatase showed a strong signal for the enzyme protein but a reduced level of sucrase antigen in nickel fed rat intestine compared with the controls. These findings suggest that the expression of various brush border enzymes along the crypt–villus axis is modulated in rat intestine exposed to nickel, which may disrupt the digestive functions of the intestinal tissue. Copyright © 2006 John Wiley & Sons, Ltd.