RESUMO
The metabolism of quercetin was investigated in Mythimna separata larvae. Quercetin 4'-O-sulfate was mainly identified in the frass when 6th instar larvae were fed artificial diets containing 1% quercetin. In the case of the 3rd instar larvae, a larger amount of quercetin was detected in the frass. M. separata larvae had different metabolic strategies for quercetin at different developmental stages.
Assuntos
Trato Gastrointestinal/metabolismo , Lepidópteros/crescimento & desenvolvimento , Lepidópteros/metabolismo , Estágios do Ciclo de Vida , Quercetina/metabolismo , Sulfatos/metabolismo , Animais , Larva/crescimento & desenvolvimento , Larva/metabolismoRESUMO
alpha-Acaridial [2(E)-(4-methyl-3-pentenyl)butenedial] is a novel monoterpene secreted from the house dust mites. Because of its molecular nature of a highly reactive, small lipidic compound, we addressed whether alpha-acaridial might function as a haptenic allergen that induced allergic contact dermatitis. Mice sensitized with alpha-acaridial were challenged by the same antigen on the ear skin. After 2 days, significant ear swelling with a prominent infiltration of CD4(+) T lymphocytes was observed. In vitro, alpha-acaridial exhibited an outstanding ability to quickly interact with and chemically modify a reference protein. Virtually all cysteine residues and a sizable fraction of lysine residues were found to be selectively modified, suggesting that alpha-acaridial could potentially interact with any proteins. Previously, numerous mite-derived proteinaceous allergens have been associated with contact dermatitis. Our study now emphasizes that small lipidic compounds released from mites comprise a new class of mite allergens, and therefore, is of significant medical implications.