A developmental profile of the levels of calcium pumps in chick cerebellum.
The functional expression and distribution of intracellular ATPase (sarco(endo)plasmic reticulum Ca(2+)-ATPase: SERCA) and plasma membrane Ca(2+)-ATPase (PMCA) was analyzed in the developing chick cerebellum. The activity and Ca(2+) uptake increase with development for both ATPases. However, the protein content increases with the stage of development only for SERCA, remaining constant for PMCA. Immunohistochemical assays showed that the ontogenesis of these ATPases goes along with definite stages of cerebellum histogenesis, and is complete at hatching. The SERCA is mainly distributed in Purkinje neurons, whereas the PMCA seems to be expressed initially in climbing fibers, shifting to soma and spiny branchlets of Purkinje cells at late embryonic stages. Granule cells express both ATPases according to their degree of maturity, whereas only PMCA is present in cerebellar glomeruli. These pumps are present in deep nuclei and the choroid plexus, although in this latter tissue their expression declines with development. The spatio-temporal distribution of SERCA and PMCA must be closely related to their association with the development of specific cells and processes of the chick cerebellum.
Sepúlveda
M Rosario
MR
Departamento de Bioquímica y Biología Molecular y Genética, Facultad de Ciencias, Universidad de Extremadura, Badajoz, Spain.
Hidalgo-Sánchez
Matías
M
Mata
Ana M
AM
D000818:Animals; D002118:Calcium / Q000378:metabolism; D000252:Calcium-Transporting ATPases / Q000378:metabolism*; D027682:Cation Transport Proteins / Q000378:metabolism; D002458:Cell Fractionation; D002531:Cerebellum / Q000196:embryology* / Q000201:enzymology*; D002642:Chick Embryo; D002645:Chickens; D006706:Homeostasis / Q000502:physiology; D007150:Immunohistochemistry; D009412:Nerve Fibers / Q000201:enzymology; D053499:Plasma Membrane Calcium-Transporting ATPases; D011689:Purkinje Cells / Q000201:enzymology / Q000648:ultrastructure; D053498:Sarcoplasmic Reticulum Calcium-Transporting ATPases; D013569:Synapses / Q000201:enzymology
D027682:Cation Transport Proteins; D053499:Plasma Membrane Calcium-Transporting ATPases; D053498:Sarcoplasmic Reticulum Calcium-Transporting ATPases; D000252:Calcium-Transporting ATPases; D002118:Calcium