Antioxidant Enzymes in Oncopeltus fasciatus (Heteroptera: Lygaeidae) Exposed to Cadmium

Catalase (CAT), glutathione reductase (GR), glutathione S-transferase (GST), and thiobarbituric acid reactive substances (TBARS) were measured together with cadmium (Cd) toxicity and accumulation in newly molted adults of Oncopeltus fasciatus (Dallas) exposed to the metal in drinking water. Insects...

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Bibliographic Details
Published in:Environmental entomology 2003-08, Vol.32 (4), p.705-710
Main Authors: CERVERA, A, MAYMÓ, A. C, MARTÍNEZ-PARDO, R, GARCERÁ, M. D
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
antioxidant activity
Applied ecology
bioaccumulation
Biological and medical sciences
cadmium
catalase
dose response
Ecotoxicology, biological effects of pollution
Effects of pollution and side effects of pesticides on protozoa and invertebrates
enzyme activity
Fundamental and applied biological sciences. Psychology
glutathione reductase
glutathione S-transferase
glutathione transferase
heavy metals
insect
insect biochemistry
lipid peroxidation
metabolic detoxification
Oncopeltus fasciatus
oxidative stress
PHYSIOLOGICAL ECOLOGY
thiobarbituric acid reactive substances
toxicity
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Summary:Catalase (CAT), glutathione reductase (GR), glutathione S-transferase (GST), and thiobarbituric acid reactive substances (TBARS) were measured together with cadmium (Cd) toxicity and accumulation in newly molted adults of Oncopeltus fasciatus (Dallas) exposed to the metal in drinking water. Insects were provided with either 200 or 20 mg Cd/liter (96-h LC30 and LC10, respectively) or with tap water for 1, 3, 5, and 7 d. Insects exposed to either concentration accumulated Cd in a time-dependent manner. Peroxilipids measured as TBARS were significantly elevated (1.7- to 1.9-fold) from day 3 in insects exposed to 200 mg Cd/liter, whereas TBARS levels of insects exposed to 20 mg Cd/liter were unaffected. Significant 2.3- and 1.9-fold inductions were observed in GR activity of insects treated with 200 mg Cd/liter for 5 and 7 d, respectively, while CAT and GST levels were not affected by Cd exposure. These findings indicate that 200 mg Cd/liter causes oxidative stress to O. fasciatus and induces GR activity, suggesting that glutathione may be involved in protection against Cd oxidative damage in this species.
ISSN:0046-225X
1938-2936
DOI:10.1603/0046-225X-32.4.705