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Differential regulation of RGS-2 by constant and oscillating PTH concentrations.

M Hömme1, F Schaefer, O Mehls

  • 1Division of Pediatric Nephrology, University Hospital for Pediatric and Adolescent Medicine, Im Neuenheimer Feld 153, 69120, Heidelberg, Germany. Meike.Hoemme@med.uni-heidelberg.de

Calcified Tissue International
|February 20, 2009
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Intermittent parathyroid hormone (PTH) preserves osteoblast function by preventing receptor desensitization and RGS-2 accumulation. Continuous PTH, however, leads to higher RGS-2 levels, potentially altering bone metabolism signaling.

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Area of Science:

  • Bone biology and metabolism
  • Cellular signaling pathways
  • Endocrinology

Background:

  • Parathyroid hormone (PTH) exhibits dual effects on bone metabolism, acting anabolically when administered intermittently and catabolically when given continuously.
  • The precise cellular mechanisms driving these distinct responses to varying PTH concentration-time patterns remain incompletely understood.
  • PTH influences intracellular signaling, including the induction of Regulator of G-protein Signaling 2 (RGS-2) via cAMP/Protein Kinase A (PKA) and inactivation of Protein Kinase C (PKC)-mediated signaling.

Purpose of the Study:

  • To investigate the impact of different PTH concentration-time patterns on intracellular signaling pathways in osteoblast-like cells.
  • To elucidate the cellular mechanisms underlying the differential effects of intermittent versus continuous PTH administration on bone metabolism.

Main Methods:

  • UMR 106-01 osteoblast-like cells were treated in a perfusion system with PTH administered intermittently (4 min/h, 10(-7) M) or continuously (equivalent cumulative dose).
  • Cyclic adenosine monophosphate (cAMP) levels were measured using radioimmunoassay.
  • Messenger RNA (mRNA) and protein levels of key signaling molecules (RGS-2, MKP-1, MKP-3, MMP-13, IGFBP-5) were assessed using real-time rtPCR, ribonuclease protection assay, and Western immunoblotting.

Main Results:

  • A single PTH pulse caused a transient 2000% increase in cAMP levels, with no desensitization observed under intermittent PTH administration compared to continuous exposure.
  • Continuous PTH perfusion resulted in a three- to five-fold higher abundance of RGS-2 compared to intermittent PTH exposure over 12 hours.
  • Pulsatile PTH significantly reduced the induction of MKP-1 and -3, while differences in MMP-13 and IGFBP-5 were minimal between exposure modes.

Conclusions:

  • Pulsatile, but not continuous, PTH administration effectively prevents PTH/PTHrP receptor desensitization and the accumulation of RGS-2 in osteoblasts.
  • Preservation of RGS-2 levels under pulsatile PTH conditions is crucial for maintaining PKC-dependent signaling pathways.
  • These findings highlight the critical role of PTH dosing patterns in regulating osteoblast signaling and bone metabolism.