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Related Experiment Videos

Expression of the porcine beta2-adrenergic receptor in Chinese hamster ovary cells.

W Liang1, C A Bidwell, P R Collodi

  • 1Department of Animal Sciences, Purdue University, West Lafayette, IN 47907, USA.

Journal of Animal Science
|September 14, 2000
PubMed
Summary

Researchers expressed the porcine beta2-adrenergic receptor (pbeta2AR) in CHO cells, creating stable cell lines. These cells are functional and useful for developing drugs to improve pig production.

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Area of Science:

  • Pharmacology
  • Molecular Biology
  • Biochemistry

Background:

  • The beta2-adrenergic receptor (beta2AR) plays a crucial role in various physiological processes.
  • Understanding the porcine beta2AR (pbeta2AR) is important for potential applications in animal production.

Purpose of the Study:

  • To express and characterize the pbeta2AR in a mammalian cell system.
  • To assess the functional competence of the cloned pbeta2AR.
  • To establish a platform for screening drugs that target pbeta2AR for enhanced pig production.

Main Methods:

  • Gene transfection of porcine beta2-adrenergic receptor (pbeta2AR) into Chinese hamster ovary (CHO) cells.
  • Generation and selection of stable cell lines with varying receptor densities.
  • Radioligand binding assays using [125I]CYP to determine receptor density, affinity (Kd), and stereospecificity.

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  • Analysis of ligand binding affinities for various adrenergic agonists and the antagonist propranolol.
  • Investigation of receptor affinity states using Gpp(NH)p, a GTP analogue.

    • Main Results:

    • Fourteen stable pbeta2AR-expressing CHO cell lines were established with diverse receptor densities.
    • The expressed pbeta2AR exhibited saturable and stereospecific binding characteristics.
    • Ligand binding data revealed two distinct affinity states for agonists, modulated by Gpp(NH)p, indicative of G-protein coupling.
    • Antagonist binding to propranolol showed a single affinity state, unaffected by Gpp(NH)p.
    • The functional characteristics of pbeta2AR in CHO cells mirrored those of beta2AR in other species.

    Conclusions:

    • The cloned porcine beta2-adrenergic receptor (pbeta2AR) is functionally expressed and competent in Chinese hamster ovary (CHO) cells.
    • Stable CHO cell lines expressing pbeta2AR provide a valuable tool for further characterization of the receptor.
    • These cell lines offer a promising system for screening and designing novel drugs to enhance pig production.