a 2012

Eicosanoids mediate hemolymph oxidative and antioxidative response in larvae of Galleria mellonella

BÜYÜKGÜZEL, Ender, Pavel HYRŠL and Kemal BÜYÜKGÜZEL

Basic information

Original name

Eicosanoids mediate hemolymph oxidative and antioxidative response in larvae of Galleria mellonella

Name in Czech

Eicosanoids mediate hemolymph oxidative and antioxidative response in larvae of Galleria mellonella

Authors

BÜYÜKGÜZEL, Ender (792 Turkey), Pavel HYRŠL (203 Czech Republic, guarantor, belonging to the institution) and Kemal BÜYÜKGÜZEL (203 Czech Republic)

Edition

XXIV International Congress of Entomology, 2012

Other information

Language

English

Type of outcome

Konferenční abstrakt

Field of Study

30102 Immunology

Country of publisher

Czech Republic

Confidentiality degree

není předmětem státního či obchodního tajemství

RIV identification code

RIV/00216224:14310/12:00060850

Organization unit

Faculty of Science

Keywords (in Czech)

Eicosanoids; Galleria mellonella; Antioxidant enzymes; Oxidative stress

Keywords in English

Eicosanoids; Galleria mellonella; Antioxidant enzymes; Oxidative stress

Tags

International impact
Změněno: 12/9/2012 11:23, doc. RNDr. Pavel Hyršl, Ph.D.

Abstract

ORIG CZ

V originále

Antioxidant enzymes play a major role in the defense against pro-oxidative effects of xenobiotics and prooxidant plant allelochemicals in insects. We posed the hypothesis that eicosanoids also mediate antioxidant enzymatic defense reactions to pro-oxidant challenge. To test this idea, we reared first-instar larvae of Galleria mellonella (L.) with esculetin (0.001%), dexamethasone (0.001%) and phenidone (0.1%) to seventh-instars. Newly ecdysed seventh-instars were then fed on artificial diet containing 0.05% xanthotoxin (XA) for 2 days. High dietary XA concentrations (0.005 and 0.1%) were associated with increasing MDA and carbonyl content (by 3-fold) and antioxidant enzyme activities, superoxide dismutase (SOD) (by 3-fold) and catalase (CAT) (by 4-fold), and glutathione-dependent enzymes, glutathione S-transferase (GST) (by 15-fold) and glutathione peroxidase (GPx) (by 7-fold). Relative to control, eicosanoid biosynthesis inhibitors (EBIs) esculetin, dexamethasone and phenidone also resulted in impaired MDA content and antioxidant enzyme activities. However, carbonyl content did not differ between control- and EBIs-feeding larvae. This oxidative stress was associated with elicited antioxidative responses by increasing SOD, GST and GPx and decreasing CAT activities in hemolymph. We infer from these findings that eicosanoids mediate insect antioxidant enzymatic responses to dietary pro-oxidants.

In Czech

Antioxidant enzymes play a major role in the defense against pro-oxidative effects of xenobiotics and prooxidant plant allelochemicals in insects. We posed the hypothesis that eicosanoids also mediate antioxidant enzymatic defense reactions to pro-oxidant challenge. To test this idea, we reared first-instar larvae of Galleria mellonella (L.) with esculetin (0.001%), dexamethasone (0.001%) and phenidone (0.1%) to seventh-instars. Newly ecdysed seventh-instars were then fed on artificial diet containing 0.05% xanthotoxin (XA) for 2 days. High dietary XA concentrations (0.005 and 0.1%) were associated with increasing MDA and carbonyl content (by 3-fold) and antioxidant enzyme activities, superoxide dismutase (SOD) (by 3-fold) and catalase (CAT) (by 4-fold), and glutathione-dependent enzymes, glutathione S-transferase (GST) (by 15-fold) and glutathione peroxidase (GPx) (by 7-fold). Relative to control, eicosanoid biosynthesis inhibitors (EBIs) esculetin, dexamethasone and phenidone also resulted in impaired MDA content and antioxidant enzyme activities. However, carbonyl content did not differ between control- and EBIs-feeding larvae. This oxidative stress was associated with elicited antioxidative responses by increasing SOD, GST and GPx and decreasing CAT activities in hemolymph. We infer from these findings that eicosanoids mediate insect antioxidant enzymatic responses to dietary pro-oxidants.