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Alterations in the activities of tyrosinase, N-acetyltransferase, and tyrosine aminotransferase in immune reactive larvae of Drosophila melanogaster.

Abstract：

:The activities of three enzymes, tyrosinase (monophenol oxidase, MPO), N-acetyltransferase (NAT), and tyrosine aminotransferase (TAT), were studied during eumelanotic encapsulation in host larvae of Drosophila melanogaster parasitized by the wasp, Leptopilina boulardi. At 24 h postinfection there was a tenfold increase in the MPO, whereas the activities of NAT and TAT were lower than those of nonparasitized controls. The data suggest that certain developmental processes are temporarily interrupted and alterations made in the metabolism of tyrosine to provide the metabolites necessary for a successful immune response. Two strains of D. melanogaster, R and Tyr-1, were parasitized and found to be immune reactive. The Tyr-1 strain is deficient in tyrosinase during the adult stage, but this mutation was found not to affect the immune capacity of the larvae. This is the first study to document concurrent alterations in the activities of various catecholamine-metabolizing enzymes during an immune response in an insect.

journal_name

Dev Comp Immunol

journal_title

Developmental and comparative immunology

authors

Vass E,Nappi AJ,Carton Y

doi

10.1016/0145-305x(93)90021-h

subject

Has Abstract

pub_date

1993-03-01 00:00:00

pages

109-18

issue

2

eissn

0145-305X

issn

1879-0089

pii

0145-305X(93)90021-H

journal_volume

17

pub_type

杂志文章

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