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In vitro analysis of the digestive enzymes amylase and alpha-glucosidase in the midguts of Locusta migratoria L. in response to the myosuppressin, SchistoFLRFamide.

Abstract：

:We have investigated the effect of the locust myosuppressin, SchistoFLRFamide, on the activity of amylase and alpha-glucosidase in the midgut of 2-week old male locusts. Total enzyme activity in the lumen contents and tissue extracts of midguts responds to SchistoFLRFamide in a dose-dependent manner that appears to vary with the feeding state of the locust and duration of exposure to the peptide. Starvation for 24h prior to assessment alters the distribution of enzyme activity between the midgut lumen contents and tissue extracts in response to SchistoFLRFamide when compared with fed locusts. Duration of exposure to SchistoFLRFamide also alters the distribution of total amylase and alpha-glucosidase activity; as duration of exposure increases, lower concentrations of SchistoFLRFamide increase total enzyme activity in the lumen contents while decreasing total enzyme activity in the tissue extracts. We suggest that the minimum amino acid sequence in SchistoFLRFamide necessary to increase both amylase and alpha-glucosidase activity is DHVFLRFamide. We have determined that two other peptides endogenous to the locust, AFIRFamide and GQERNFLRFamide, increase amylase and alpha-glucosidase activity in midgut lumen contents.

journal_name

J Insect Physiol

journal_title

Journal of insect physiology

authors

Hill SR,Orchard I

doi

10.1016/j.jinsphys.2004.10.003

keywords:

subject

Has Abstract

pub_date

2005-01-01 00:00:00

pages

1-9

issue

1

eissn

0022-1910

issn

1879-1611

pii

S0022-1910(04)00176-3

journal_volume

51

pub_type

杂志文章

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