Responses of GPCR135 to human gene 3 (H3) relaxin in CHO-K1 cells determined by microphysiometry

Ann N Y Acad Sci. 2005 May:1041:332-7. doi: 10.1196/annals.1282.053.


This study examined the functional response to human relaxin 2 (H2 relaxin), human relaxin 3 (H3 relaxin), porcine relaxin, and human INSL3 in the cytosensor microphysiometer, using CHO-K1 cells stably expressing human GPCR135. CHO-K1 cells stably expressing GPCR135 were generated by the serial dilution method and receptor properties were assessed. Saturation studies of [125I] H3 relaxin binding to GPCR135 in these cells gave a Bmax of 32.61 +/- 6.5 fmol/mg protein and Kd of 0.12 +/- 0.08 nM. The functional response to H3 relaxin and other relaxin/insulin peptides of GPCR135 expressed in CHO-K1 cells was measured in the cytosensor microphysiometer and analyzed using inhibitors of signal transduction proteins.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • CHO Cells
  • Cricetinae
  • Humans
  • Receptors, G-Protein-Coupled / genetics
  • Receptors, G-Protein-Coupled / metabolism*
  • Relaxin / analogs & derivatives*
  • Relaxin / genetics
  • Relaxin / metabolism
  • Signal Transduction


  • RLN3 protein, human
  • RXFP3 protein, human
  • Receptors, G-Protein-Coupled
  • Relaxin