title: Induction of calbindin-D 28K gene and protein expression by physiological stimuli but not in calcium-mediated degeneration in rat PC12 pheochromocytoma cells.
abstract: To understand the role of calbindin-D 28K in neuronal degeneration, we examined its expression in differentiated PC12 cells in response to calcium intoxication, using the ionophore A23187 treatment, that results in cell degeneration and death. We first established that calbindin-D 28K is expressed in PC12 cells. The amounts of calbindin-D 28K mRNA and protein were increased by the differentiation factors, NGF and retinoic acid, but not by vitamin D3. Calbindin-D 28K expression was also significantly up-regulated by stimuli (depolarization, low concentrations of Ca2+ ionophore A23187) which increase intracellular calcium levels within the physiological range. In contrast, the calbindin-D 28K mRNA and protein concentrations were not modulated by high concentrations of A23187, which resulted in cell degeneration and death. Experiments with the antisense oligonucleotides showed that, although the calbindin-D 28K protein levels were decreased significantly, the progression of degenerative changes induced by calcium via A23187, was not altered.
authors.affiliation: INSERM U289, Hôpital de la Salpêtrière, Paris, France.
authors.forename: S
authors.initials: S
authors.lastname: Vyas
authors.forename: P P
authors.initials: PP
authors.lastname: Michel
authors.forename: M C
authors.initials: MC
authors.lastname: Copin
authors.forename: N F
authors.initials: NF
authors.lastname: Biguet
authors.forename: M
authors.initials: M
authors.lastname: Thomasset
authors.forename: Y
authors.initials: Y
authors.lastname: Agid
mesh_terms: D000818:Animals; D001483:Base Sequence; D064026:Calbindins; D000001:Calcimycin / Q000494:pharmacology; D002118:Calcium / Q000378:metabolism; D018076:DNA, Complementary; D005786:Gene Expression Regulation / Q000187:drug effects; D008969:Molecular Sequence Data; D016716:PC12 Cells; D012333:RNA, Messenger / Q000096:biosynthesis / Q000378:metabolism; D051381:Rats; D064030:S100 Calcium Binding Protein G / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism; D015854:Up-Regulation
chemical_list: D064026:Calbindins; D018076:DNA, Complementary; D012333:RNA, Messenger; D064030:S100 Calcium Binding Protein G; D000001:Calcimycin; D002118:Calcium