Effects of cAMP on intercellular coupling and osteoblast differentiation

Milena Romanello, Luigi Moro, Doroti Pirulli, Sergio Crovella, Paola D'Andrea

Research output: Contribution to journalArticle

Abstract

Bone-forming cells are organized in a multicellular network interconnected by gap junctions. Direct intercellular communication via gap junctions is an important component of bone homeostasis, coordinating cellular responses to external signals and promoting osteoblast differentiation. The cAMP pathway, a major intercellular signal transduction mechanism, regulates osteoblastic function and metabolism. We investigated the effects of this second messenger on junctional communication and on the expression of differentiation markers in human HOBIT osteoblastic cells. Increased levels of cAMP induce posttranslational modifications (i.e., phosphorylations) of connexin43 and enhancement of gap junction assembly, resulting in an increased junctional permeance to Lucifer yellow and to a positive modulation of intercellular Ca2+ waves. Increased intercellular communication, however, was accompanied by a parallel decrease of alkaline phosphatase activity and by an increase of osteocalcin expression. cAMP-dependent stimulation of cell-to-cell coupling induces a complex modulation of bone differentiation markers.

Original languageEnglish
Pages (from-to)1138-1144
Number of pages7
JournalBiochemical and Biophysical Research Communications
Volume282
Issue number5
DOIs
Publication statusPublished - 2001

Keywords

  • Alkaline phosphatase
  • cAMP
  • Gap junctions
  • Osteoblasts
  • Osteocalcin

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

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