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Human guanylin: cDNA isolation, structure, and activity.

R C Wiegand1, J Kato, M D Huang

  • 1Department of Molecular Biology, Monsanto Corporate Research, Monsanto Company, St. Louis, MO 63198.

FEBS Letters
|October 19, 1992
PubMed
Summary
This summary is machine-generated.

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Guanylin, a peptide hormone, is found in the human intestine. It influences intestinal fluid and electrolyte balance by activating guanylate cyclase and increasing cyclic GMP.

Area of Science:

  • Gastroenterology
  • Molecular Biology
  • Endocrinology

Background:

  • Guanylin is a mammalian peptide homologous to heat-stable enterotoxins.
  • It activates intestinal guanylate cyclase, increasing cyclic GMP.
  • This mechanism is crucial for regulating intestinal function.

Purpose of the Study:

  • To isolate and characterize the human guanylin precursor.
  • To investigate the functional role of human guanylin in intestinal physiology.
  • To determine if guanylin affects fluid and electrolyte transport.

Main Methods:

  • Human intestinal cDNA library screening for guanylin precursor.
  • mRNA expression analysis in human ileum and colon.
  • Functional assays using T84 cells and rat colonic mucosa.

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Main Results:

  • Isolated cDNA encoding the human guanylin precursor.
  • Confirmed high mRNA expression in human ileum and colon.
  • Demonstrated that human guanylin increases cyclic GMP, displaces STa binding, and elevates short-circuit current in rat colon.

Conclusions:

  • Human guanylin is expressed in the intestine and functions similarly to enterotoxins.
  • It plays a significant role in regulating intestinal fluid and electrolyte absorption.
  • Further research into guanylin's role in intestinal diseases is warranted.