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Functional Cloning Using a Xenopus Oocyte Expression System
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Cloning, sequencing, chromosomal location, and function of cDNAs encoding an opioid growth factor receptor (OGFr) in

I S Zagon1, M F Verderame, S S Allen

  • 1Department of Neuroscience, H-109, The Milton S. Hershey Medical Center, The Pennsylvania State University, College of Medicine, 500 University Drive, Hershey PA, USA. iszl@psu.edu

Brain Research
|March 10, 2000
PubMed

Insights

Researchers identified a novel human opioid growth factor (OGF) receptor, distinct from classical opioid receptors, crucial for regulating cell proliferation. This discovery validates the OGF-receptor interaction in human growth processes.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • The opioid growth factor (OGF), [Met(5)]-enkephalin, is a peptide regulating cell proliferation and tissue organization.
  • OGF's mechanism of action involves a specific receptor, yet its human molecular identity was previously unknown.

Purpose of the Study:

  • To clone and characterize the human opioid growth factor receptor (OGFr).
  • To investigate the functional role and chromosomal localization of the identified OGFr.

Main Methods:

  • cDNA cloning and sequencing to identify receptor variants.
  • Hybridization studies to determine mRNA expression.
  • Antisense oligonucleotide experiments to assess functional impact.
  • Fluorescent in situ hybridization (FISH) for chromosomal mapping.

Main Results:

  • Five alternatively spliced forms of the human OGFr were identified, with the longest encoding a 697-amino acid protein.
  • OGFr mRNA is expressed in diverse normal and neoplastic human cells and tissues.
  • Inhibition of OGFr using antisense oligonucleotides enhanced cell growth.
  • FISH localized the human OGFr gene to chromosome 20q13.3.
  • The identified receptor shows no homology to classical opioid receptors.

Conclusions:

  • The study provides molecular validation for a novel human OGFr.
  • This receptor plays a significant role in regulating cell growth processes.
  • The findings open new avenues for understanding OGF-mediated biological functions.

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