title: Ca2+ and cAMP signaling in human embryonic stem cell-derived dopamine neurons.
abstract: Human embryonic stem (hES) cell differentiation into dopamine neurons is considered a promising strategy for cell replacement therapy in Parkinson's disease, yet the functional properties of hES cell-derived dopamine neurons remain poorly defined. The objective of this study was to characterize intracellular calcium (Ca(2+)) and sub-plasma membrane cyclic AMP-signaling properties in hES cell-derived dopamine neurons. We found that hES cell-derived dopamine neurons and neural progenitors raised Ca(2+) from intra- and extracellular compartments in response to depolarization, glutamate, ATP, and dopamine D(2) receptor activation, while undifferentiated hES cells only mobilized Ca(2+) from intracellular stores in response to ATP and D(2) receptor-induced activation. Interestingly, we also found that hES cell-derived dopamine neurons in addition to primary ventral midbrain dopamine neurons were more prone to release Ca(2+) from intracellular stores than non-dopamine neurons following treatment with the neuropeptide neurotensin. Furthermore, hES cell-derived dopamine neurons showed cAMP elevations in response to forskolin and 3-isobutyl-methylxanthine, similar to primary dopamine neurons. Taken together, these results unravel the temporal sequence by which hES cells acquire Ca(2+) and cAMP signaling competence during dopamine differentiation.
authors.affiliation: Department of Medical Biochemistry and Biophysics, Linnaeus Center in Developmental Biology for Regenerative Medicine, Karolinska Institutet, Stockholm, Sweden.
authors.forename: Seth
authors.initials: S
authors.lastname: Malmersjö
authors.forename: Isabel
authors.initials: I
authors.lastname: Liste
authors.forename: Oleg
authors.initials: O
authors.lastname: Dyachok
authors.forename: Anders
authors.initials: A
authors.lastname: Tengholm
authors.forename: Ernest
authors.initials: E
authors.lastname: Arenas
authors.forename: Per
authors.initials: P
authors.lastname: Uhlén
mesh_terms: D000818:Animals; D002118:Calcium / Q000032:analysis / Q000378:metabolism*; D020013:Calcium Signaling / Q000187:drug effects / Q000502:physiology; D002454:Cell Differentiation / Q000187:drug effects / Q000502:physiology; D002478:Cells, Cultured; D000242:Cyclic AMP / Q000032:analysis / Q000378:metabolism*; D004298:Dopamine / Q000378:metabolism*; D053595:Embryonic Stem Cells / Q000187:drug effects / Q000378:metabolism / Q000502:physiology*; D006801:Humans; D008274:Magnesium / Q000494:pharmacology; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D008954:Models, Biological; D055495:Neurogenesis / Q000187:drug effects / Q000502:physiology; D009474:Neurons / Q000187:drug effects / Q000378:metabolism / Q000502:physiology*; D009496:Neurotensin / Q000494:pharmacology; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology
chemical_list: D009496:Neurotensin; D000242:Cyclic AMP; D008274:Magnesium; D002118:Calcium; D004298:Dopamine