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The effects of insulin/IGF-I on glucose and leucine metabolism in the redclaw crayfish (Cherax quadricarinatus).

Abstract：

:In recent years, invertebrate peptides have been identified which share substantial homologies with vertebrate insulin and insulin-like growth factors (IGFs), indicating a high degree of conservation of insulin/IGF systems through animal evolution. In a previous study, we provided evidence for the presence of IGF-I-like peptides in the redclaw (Cherax quadricarinatus), a species of freshwater crayfish endemic to northern Australia river systems which has attained support as a culture species. The general aim of the current study was to elucidate the functional significance of IGF-I-like peptides in this species by examining the effects of mammalian IGF-I on glucose and leucine metabolism. Juvenile redclaw were injected with a single dose of purified human insulin, recombinant human (rh) IGF-I, or Des-1-3-IGF-I. Glucose levels in redclaw tissues were then determined over an 8-hr period using enzymatic approaches. It was shown that injection of rhIGF-I induced an acute increase in free glucose content in hepatopancreas while Des-1-3-IGF-I and insulin raised free glucose levels in abdominal muscle. Radiolabel tracer approaches also demonstrated that injection of rhIGF-I increased glycogen synthesis in abdominal muscle and elevated the incorporation of leucine into protein in both abdominal muscle and hepatopancreas. Taken together, the findings of this study suggest that IGF-I-like peptides are biologically active in this species and may be of significance to metabolic and growth-related processes.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Richardson NA,Anderson AJ,Sara VR

doi

10.1006/gcen.1996.6824

subject

Has Abstract

pub_date

1997-03-01 00:00:00

pages

287-93

issue

3

eissn

0016-6480

issn

1095-6840

pii

S0016-6480(96)96824-0

journal_volume

105

pub_type

杂志文章

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