Synthesis and properties of fluorescent beta-adrenoceptor ligands

Biochemistry. 1994 Aug 9;33(31):9126-34. doi: 10.1021/bi00197a015.


We describe the synthesis of bordifluoropyrromethene (BODIPY), fluorescein, and related fluorescent derivatives of the beta-adrenergic ligand CGP 12177. With these probes we screened insect (Sf9) cells stably transformed with the human beta 2-adrenoceptor gene and expressing (2-3.5) x 10(5) human beta 2-adrenoceptors per cell. Among these derivatives only BODIPY-CGP gave a receptor-specific signal sufficiently strong for measuring the on- and off-rate constants and the equilibrium dissociation constant of beta-adrenoceptor-specific binding by spectrofluorometry or photon counting. Similar KD values for BODIPY-CGP binding were obtained by kinetic measurements (approx. 250 pM) and under equilibrium conditions (400 +/- 180 pM), and these were in the same range as those obtained with [3H]CGP 12177 (200 +/- 32 pM). The cell-bound fluorescence could be quenched specifically with nonfluorescent CGP 12177 to near background levels. The disposition of the beta 2-adrenoceptors in BODIPY-CGP-stained Sf9 cells was mainly restricted to the cell surface at 4 and 30 degrees C. Hence, beta-adrenoceptor-expressing cells can be stained specifically with BODIPY-CGP, and beta-adrenoceptors on a single cell can be assessed by photon counting under the fluorescence microscope. Cells can also be scanned by fluorescence-activated flow cytometry.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adrenergic beta-Antagonists / chemical synthesis*
  • Adrenergic beta-Antagonists / metabolism
  • Animals
  • Boron Compounds
  • Cell Line
  • Fluorescent Dyes / chemical synthesis*
  • Fluorescent Dyes / metabolism
  • Humans
  • Imidazoles
  • Indicators and Reagents
  • Kinetics
  • Ligands
  • Moths
  • Propanolamines / metabolism*
  • Receptors, Adrenergic, beta / metabolism*
  • Receptors, Adrenergic, beta-2 / metabolism*
  • Recombinant Proteins / metabolism
  • Structure-Activity Relationship
  • Transfection


  • Adrenergic beta-Antagonists
  • Boron Compounds
  • Fluorescent Dyes
  • Imidazoles
  • Indicators and Reagents
  • Ligands
  • Propanolamines
  • Receptors, Adrenergic, beta
  • Receptors, Adrenergic, beta-2
  • Recombinant Proteins
  • BODIPY-CGP 12177
  • CGP 12177