Cited by 271Neuropeptides and Animal PhysiologyGastrointestinal motility and disordersCardiovascular, Neuropeptides, and Oxidative Stress Research

Identification of Two Prokineticin cDNAs: Recombinant Proteins Potently Contract Gastrointestinal Smooth Muscle

Li, M., Bullock, C. M., Knauer, D. J., Ehlert, F. J., Zhou, Q. Y.·2001·Molecular Pharmacology

Abstract

The motility of gastrointestinal tract is regulated by classical neurotransmitters, neuropeptides, and humoral agents. Two novel human cDNAs have been cloned based on their sequence similarity to a frog skin secretion protein, Bv8, and a nontoxic protein of mamba snake venom. These human cDNAs encode two secreted proteins of 86 and 81 amino acids. Northern blot hybridization has revealed that these cDNAs are expressed in gastrointestinal tract, particularly the stomach. Recombinant proteins with authentic N-terminal sequences have been produced in Escherichia coli and refolded into functional proteins by careful control of protein aggregation. Mass spectrometry has confirmed the formation of five pairs of disulfide bonds. The refolded recombinant proteins potently contract gastrointestinal smooth muscle with EC(50) values in the subnanomolar range. The contractile effects of the recombinant proteins are specific for gastrointestinal smooth muscle, because they have no effect on vascular or respiratory smooth muscle. To reflect their potent and specific effects on gastrointestinal smooth muscle cells, we have named these recombinant proteins prokineticins. Ligand binding studies with iodinated prokineticin revealed the presence of a high-affinity site in ileal smooth muscle. The displacement of specific binding by GTP gamma S suggests that the prokineticin receptor may belong to the family of G protein-coupled receptors. Experiments with verapamil and nifedipine revealed that calcium influx is essential for the contractile activity of prokineticins on gastrointestinal smooth muscle. In summary, we have identified two novel endogenous regulators of gastrointestinal motility. The availability of recombinant prokineticins should provide novel therapeutic agents for disorders involving impaired gastrointestinal motility.

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Crossref · 10.1124/mol.59.4.692

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  • When PK2 binds to PK-R2, signaling cascades important for development of the olfactory system and GnRH neuronal progenitors are initiated.

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Authors
Li, M., Bullock, C. M., Knauer, D. J., Ehlert, F. J., & Zhou, Q. Y.
Affiliations
University of California, Irvine (US)
Venue
Molecular Pharmacology
Publisher
Elsevier BV
Published
2001-04-01
Volume
59
Issue
4
Pages
692-698
ISSN
  • 0026-895X (ISSN-L)
  • 1521-0111
OpenAlex
W1825488655
Cited by
269
References
36
Citations by year
2026: 1 · 2025: 5 · 2024: 1 · 2023: 12 · 2022: 10 · 2021: 7 · 2020: 8 · 2019: 3 · 2018: 7 · 2017: 7 · 2016: 9 · 2015: 12 · 2014: 10 · 2013: 13 · 2012: 12
FWCI
3.19
Type
journal article
Language
en
Open access
closed
Locations
  • Molecular Pharmacology (publishedVersion)
  • PubMed (publishedVersion)
Funders
University of California, Irvine
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Health Sciences › Medicine › Gastroenterology › Gastrointestinal motility and disorders
  • Health Sciences › Medicine › Surgery › Cardiovascular, Neuropeptides, and Oxidative Stress Research
Keywords
prokineticins, gastrointestinal smooth muscle contraction, gastrointestinal motility, prokineticin receptors, G protein-coupled receptors, disulfide bond formation, recombinant protein refolding, calcium influx, ileal smooth muscle, Bv8, stomach, gastrointestinal motility disorders
MeSH terms
Animals, Binding, Competitive, Cloning, Molecular, Dose-Response Relationship, Drug, Gastrointestinal Hormones, Guinea Pigs, Humans, Ileum, Molecular Sequence Data, Muscle, Smooth, Neuropeptides, Organ Specificity, Receptors, Cell Surface, Recombinant Proteins, Guanosine 5'-O-(3-Thiotriphosphate), Sequence Homology, Amino Acid, Protein Folding, DNA, Complementary, Vascular Endothelial Growth Factor, Endocrine-Gland-Derived, In Vitro Techniques

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