Perturbed bone composition and integrity with disorganized osteoblast function in zinc receptor/Gpr39-deficient mice

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

Changes in bone matrix composition are frequently found with bone diseases and may be associated with increased fracture risk. Bone is rich in the trace element zinc. Zinc was established to play a significant role in the growth, development, and maintenance of healthy bones; however, the mechanisms underlying zinc effects on the integrity of the skeleton are poorly understood. Here, we show that the zinc receptor (ZnR)/Gpr39 is required for normal bone matrix deposition by osteoblasts. Initial analysis showed that Gpr39-deficient (Gpr39-/-) mice had weaker bones as a result of altered bone composition. Fourier transform infrared spectroscopy analysis showed high mineral-to-matrix ratios in the bones of Gpr39-/- mice. Histologic analysis showed abnormally high numbers of active osteoblasts but normal osteoclast numbers on the surfaces of bones from Gpr39-/- mice. Furthermore, Gpr39-/- osteoblasts had disorganized matrix deposition in vitro with cultures exhibiting abnormally low collagen and high mineral contents, findings that demonstrateacell-intrinsic role for ZnR/Gpr39 in these cells. We show that both collagen synthesis and deposition by Gpr39-/- osteoblasts are perturbed. Finally, the expression of the zinc transporter Zip13 and a disintegrin and metalloproteinase with thrombospondin motifs family of zinc-dependent metalloproteases that regulate collagen processing was downregulated in Gpr39-/- osteoblasts. Altogether, our results suggest that zinc sensing by ZnR/Gpr39 affects the expression levels of zinc-dependent enzymes in osteo-blasts and regulates collagen processing and deposition.

Detaljer

Författare
  • Milena Jovanovic
  • Felix N. Schmidt
  • Gali Guterman-Ram
  • Hanifeh Khayyeri
  • Sahar Hiram-Bab
  • Ayelet Orenbuch
  • Svetlana Katchkovsky
  • Anastasia Aflalo
  • Hanna Isaksson
  • Björn Busse
  • Katharina Jähn
  • Noam Levaot
Enheter & grupper
Externa organisationer
  • Tel-Aviv University
  • University Medical Center Hamburg-Eppendorf
  • Ben Gurion University of the Negev
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Cell- och molekylärbiologi

Nyckelord

Originalspråkengelska
Sidor (från-till)2507-2518
Antal sidor12
TidskriftFASEB Journal
Volym32
Utgåva nummer5
StatusPublished - 2018
PublikationskategoriForskning
Peer review utfördJa