Cp. Da Silva et Ah. Guse, Intracellular Ca2+ release mechanisms: multiple pathways having multiple functions within the same cell type?, BBA-MOL CEL, 1498(2-3), 2000, pp. 122-133
Citations number
88
Categorie Soggetti
Cell & Developmental Biology
Journal title
BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH
The elevation of the cytosolic and nuclear Ca2+ concentration is a fundamen
tal signal transduction mechanism in almost all eukaryotic cells. Interesti
ngly, three Ca2+-mobilising second messengers, D-myo-inositol 1,4,5-trispho
sphate (InsP(3)), cyclic adenosine diphosphoribose (cADPR), and nicotinic a
cid adenine dinucleotide phosphate (NAADP(+)) were identified in a phylogen
etically wide range of different organisms. Moreover, in an as yet very lim
ited number of cell types, sea urchin eggs, mouse pancreatic acinar cells,
and human Jurkat T-lymphocytes, all three Ca2+-mobilising ligands have been
shown to be involved in the generation of Ca2+ signals. This situation rai
ses the question why during evolution all three messengers have been conser
ved in the same cell type. From a theoretical point of view the following p
oints may be considered: (i) redundant mechanisms ensuring intact Ca2+ sign
alling even if one system does not work, (ii) the need for subcellularly lo
calised Ca2+ elevations to obtain a certain physiological response of the c
ell, and (iii) tight control of a physiological response of the cell by a t
emporal sequence of Ca2+ signalling events. These theoretical consideration
s are compared to the current knowledge regarding the three messengers in s
ea urchin eggs, mouse pancreatic acinar cells, and human Jurkat T lymphocyt
es. (C) 2000 Elsevier Science B.V. All rights reserved.